Baby stroller and folding method thereof

Abstract

The present invention discloses a baby stroller, including a seat frame assembly and a baby stroller frame, wherein the seat frame assembly includes a first back portion, a second back portion, a seat portion, a switch unit, an upper rotating joint connecting the first back portion and the second back portion, and a lower rotating joint connecting the second back portion and the seat portion, wherein the switch unit is installed on a crossbeam between the first back portion and the second back portion, wherein the crossbeam is connected to the upper rotating joint, and the switch unit is capable of unlocking the upper rotating joint and the lower rotating joint. The present invention also discloses a method for folding a baby stroller frame. In the present invention, after the upper rotating joint and the lower rotating joint are unlocked, the first back portion and the second back portion are rotated and folded relative to the seat portion, thereby realizing the independent folding and folding operation of the seat frame assembly, and can be independently folded or unfolded relative to the baby stroller frame, which is easy to adjust and suitable for different usage states and needs.

Description

[0001] Divisional application statement

[0002] This application is a divisional application of the Chinese invention patent application filed on September 20, 2019, with application number 201910893521.7 and invention name “Baby stroller and folding method thereof”. Technical Field

[0003] The present invention relates to the technical field of baby strollers, and in particular to a baby stroller and a folding method thereof. Background Art

[0004] The existing baby stroller frame has a complicated folding method, which is not easy for users to operate.

[0005] In addition, the existing baby stroller frame is not provided with a seat frame assembly that can be folded and collapsed independently. When the baby stroller is collapsed, the seat frame is folded and collapsed together, and the seat frame cannot be adjusted independently, and the flexibility is poor.

[0006] Therefore, it is necessary to design a baby stroller and a baby stroller folding method that is easy to operate and can independently fold, collapse and adjust the seat frame assembly. Summary of the invention

[0007] The purpose of the present invention is to overcome the deficiencies of the prior art and to provide a baby stroller and a baby stroller folding method having a seat frame assembly that is easy to operate and can be independently folded, folded and adjusted.

[0008] The present invention provides a baby stroller, comprising a seat frame assembly and a baby stroller frame, wherein the seat frame assembly comprises a first back portion, a second back portion, a seat portion, a switch unit, an upper rotating joint connected between the first back portion and the second back portion, and a lower rotating joint connected between the second back portion and the seat portion, wherein the switch unit is installed on a cross beam between the first back portion and the second back portion, wherein the cross beam is connected to the upper rotating joint, and wherein the switch unit can unlock the upper rotating joint and the lower rotating joint.

[0009] Further,

[0010] When folding, after operating the switch unit, the switch unit drives the upper rotating joint and the lower rotating joint to unlock, so that the first back portion can be rotated and folded relative to the second back portion, and the second back portion can be rotated and folded relative to the seat portion;

[0011] When unfolding, the first back portion is rotated, and after the first back portion is rotated and unfolded to the position relative to the second back portion, the upper rotation joint locks the first back portion, and after the second back portion is rotated and unfolded to the position relative to the seat portion, the lower rotation joint locks the second back portion.

[0012] Further, the switch unit comprises a flip member, a return spring and a steel wire, the flip member is rotatably connected to the cross beam, the return spring is installed between the flip member and the cross beam, one end of the steel wire is connected to the flip member, and the other end is connected to the upper rotation joint and the lower rotation joint;

[0013] When the flipping member is rotated, the flipping member pulls the steel wire, and the steel wire drives the upper rotating joint and the lower rotating joint to unlock.

[0014] Further, the lower rotation joint includes a first housing, a second housing, a rotation shaft, a locking pin and a locking slot;

[0015] The first housing is connected to the second back portion, the second housing is connected to the seat portion, the rotation shaft connects the first housing and the second housing, the first housing can rotate around the rotation shaft, the locking pin is connected to the switch unit and installed between the first housing and the second housing, and the locking groove is formed on the second housing;

[0016] When locked, the locking pin is inserted into the locking groove;

[0017] When unlocking, the switch unit drives the locking pin to escape from the locking groove.

[0018] Furthermore, the lower rotating joint also includes a sliding groove shell, a sliding member and a claw plate, the sliding groove shell is connected between the second back and the second shell, the sliding groove shell is connected to the switch unit, one end of the locking pin is fixed to the sliding member, and the other end passes through the limiting groove of the sliding groove shell and can slide along the sliding groove shell, the claw plate is installed on the second shell, and the multiple grooves on the claw plate correspond to the locking groove, and the other end of the locking pin passes through the sliding groove shell and is inserted into the groove and the locking groove.

[0019] Further, the upper rotating joint comprises a first rotating member, a second rotating member and a cam, the first rotating member is connected to the first back portion, the second rotating member is connected to the second back portion, and the first rotating member and the second rotating member are rotatably connected;

[0020] When the upper rotating joint is locked, the cam is located between the first rotating member and the second rotating member along the axis direction;

[0021] The switch unit can drive the cam to disengage from the first rotating member or the second rotating member along the axial direction, and the upper rotating joint is unlocked.

[0022] Furthermore, the baby stroller frame includes an upper push rod, a lower push rod, a front bracket, a rear bracket, a first rotating joint, a second rotating joint and an unlocking trigger mechanism, wherein the unlocking trigger mechanism is installed on the upper push rod, the lower end of the upper push rod is connected to the upper end of the lower push rod via the first rotating joint, the lower end of the lower push rod is connected to the upper ends of the front bracket and the rear bracket via the second rotating joint, and the unlocking trigger mechanism is used to trigger the unlocking of the first rotating joint, and rotate the lower push rod to trigger the unlocking of the second rotating joint.

[0023] Furthermore, the unlocking trigger mechanism comprises a button, and the unlocking trigger mechanism is used to unlock itself after pressing the button, and drive the first rotating joint to unlock by rotating;

[0024] The unlocking trigger mechanism also includes an upper semicircular shell, a telescopic member, a spring and a lower semicircular shell, wherein the upper semicircular shell and the lower semicircular shell are spliced ​​into a cylindrical tube, a part of the button extends out of the lower semicircular shell, the button is installed between the lower semicircular shell and the spring, the telescopic member is connected to the upper semicircular shell, and both ends of the telescopic member are respectively connected to upper steel wires;

[0025] After the button is pressed, the unlocking trigger mechanism is unlocked, and the button, the upper semicircular shell and the lower semicircular shell are rotated to compress the telescopic member, and the telescopic member pulls the upper steel wire to drive the first rotating joint to unlock.

[0026] Furthermore, the upper push rod comprises an inner tube and an outer tube, and the cylindrical tube is sleeved outside the inner tube;

[0027] The unlocking trigger mechanism also includes a sleeve, which is fixedly connected to the outer tube, and the two ends of the cylindrical tube are respectively inserted into the sleeve and can rotate. A locking groove is provided on the sleeve, and locking blocks extend from both ends of the button. The locking block is inserted into the locking groove. When the button is pressed, the locking block comes out of the locking groove, and the cylindrical tube can rotate relative to the sleeve.

[0028] Further, the telescopic member includes a first connecting member, a second connecting member, a first telescopic rod and a second telescopic rod, the first connecting member is connected to one end of the first telescopic rod, the second connecting member is connected to one end of the second telescopic rod, the other end of the first telescopic rod is connected to the other end of the second telescopic rod, the first connecting member and the second connecting member are respectively connected to one of the upper steel wires, and the first connecting member and the second connecting member are both provided with a slope boss;

[0029] Two slope grooves are provided in the upper semicircular shell, and the slope bosses are embedded in the slope grooves. When the upper semicircular shell rotates, the slope grooves push the two slope bosses to drive the first telescopic rod and the second telescopic rod to move closer to each other and retract.

[0030] Further, the first rotation joint comprises an upper push rod rotation housing, a lower push rod rotation housing and an upper locking member;

[0031] The upper push rod rotating shell is connected to the lower end of the upper push rod, the lower push rod rotating shell is connected to the upper end of the lower push rod, the upper locking piece is connected to the unlocking trigger mechanism through an upper steel wire, and the upper steel wire pulls the upper locking piece to unlock the first rotating joint;

[0032] The first rotating joint further comprises a gear, a first gear slot is provided in the upper push rod rotating housing, and a second gear slot is provided in the lower push rod rotating housing.

[0033] When the first rotation joint is locked, the gear is embedded in the first gear groove and the second gear groove;

[0034] When the upper locking member moves upward, the gear disengages from the first gear slot or the second gear slot, and the first rotation joint is unlocked.

[0035] Further, the second rotating joint comprises a lower steel wire and a lower locking piece, and after the upper push rod rotates, the lower steel wire pulls the lower locking piece to unlock the second rotating joint;

[0036] The second rotating joint includes a lower push rod rotating member, a front bracket rotating member and a rear bracket rotating member;

[0037] The lower push rod rotating member is connected to the lower end of the lower push rod, and the lower push rod rotating member is rotatably connected to the front bracket rotating member via a first rotating shaft;

[0038] The front bracket rotating member is connected to the upper end of the front bracket, and the front bracket rotating member is rotatably connected to the rear bracket rotating member via a second rotating shaft;

[0039] The rear bracket rotating member is connected to the upper end of the rear bracket;

[0040] The lower push rod rotating member, the front bracket rotating member and the rear bracket rotating member are all provided with lower locking grooves, and the lower locking member is inserted into the lower locking grooves, and the second rotating joint is locked.

[0041] The present invention also provides a method for folding a baby stroller as described in any one of the above, comprising the following steps:

[0042] Operating the switch unit to unlock the upper rotating joint and the lower rotating joint;

[0043] Flipping the first back forward and downward so that the first back approaches the second back;

[0044] Flipping the second back portion forward and downward so that the second back portion is close to the seat portion;

[0045] Operating the unlocking trigger mechanism to unlock the first rotating joint;

[0046] Flipping the upper push rod backward and downward to get close to the lower push rod;

[0047] The second rotating joint is unlocked, and the lower push rod is flipped forward and downward to be close to the front bracket;

[0048] Lift the handle hole on the seat frame assembly, and the front bracket and the rear bracket are folded.

[0049] After adopting the above technical solution, the following beneficial effects are achieved:

[0050] After the upper rotating joint and the lower rotating joint are unlocked, the first back portion and the second back portion are rotated and folded relative to the seat portion, thereby realizing the independent folding and folding operation of the seat frame assembly. The seat frame can be folded or unfolded independently relative to the baby stroller frame, which is easy to adjust and suitable for different usage states and needs. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] The disclosure of the present invention will become more easily understood with reference to the accompanying drawings. It should be understood that these drawings are only for illustrative purposes and are not intended to limit the scope of protection of the present invention. In the drawings:

[0052] Figure 1 is a three-dimensional diagram of a baby stroller in Embodiment 1 of the present invention;

[0053] Figure 2 is a partial enlarged view of the baby stroller in the first embodiment of the present invention;

[0054] Figure 3 is a three-dimensional diagram of a seat frame assembly in Embodiment 1 of the present invention;

[0055] Figure 4 is a partial enlarged view of the switch unit of the seat frame assembly in the first embodiment of the present invention;

[0056] Figure 5 is a three-dimensional diagram of a flip member of a switch unit of a seat frame assembly in Embodiment 1 of the present invention;

[0057] Figure 6 is a three-dimensional diagram of the switch unit of the seat frame assembly in the first embodiment of the present invention with the flip member omitted;

[0058] Figure 7 is a partial enlarged view of the lower rotating joint of the seat frame assembly in the first embodiment of the present invention;

[0059] Figure 8 is an exploded view of the lower rotating joint of the seat frame assembly in the first embodiment of the present invention;

[0060] Fig. 9 is a schematic structural diagram of a lower rotating joint of a seat frame assembly in a modified example of the first embodiment of the present invention;

[0061] Fig.10 is an exploded view of a side surface of a lower rotating joint of a seat frame assembly in a modified example of the first embodiment of the present invention;

[0062] Fig.11 is an exploded view of another side surface of the lower rotating joint of the seat frame assembly in a modified example of the first embodiment of the present invention;

[0063] Fig.12 is a partial enlarged view of the seat portion of the seat frame assembly in a modified example of the first embodiment of the present invention;

[0064] Fig.13 is an exploded view of a side surface of an upper rotating joint of a seat frame assembly in Embodiment 1 of the present invention;

[0065] Fig.14 is an exploded view of another side of the upper rotating joint of the seat frame assembly in the first embodiment of the present invention;

[0066] Fig.15 is a three-dimensional diagram of the baby stroller frame in the unfolded state in the first embodiment of the present invention;

[0067] Fig.16 is an exploded view from a top view of an unlocking trigger mechanism of a baby stroller frame in Embodiment 1 of the present invention;

[0068] Fig.17 is an exploded view from a bottom view of the unlocking trigger mechanism of the baby stroller frame in the first embodiment of the present invention;

[0069] Fig.18 is an exploded view from a left perspective of the first rotation joint of the baby stroller frame in the first embodiment of the present invention;

[0070] Fig.19 is an exploded view from the right side of the first rotating joint of the baby stroller frame in the first embodiment of the present invention;

[0071] Fig. 20 is a partial enlarged view of the first rotating joint of the baby stroller frame in the first embodiment of the present invention;

[0072] Fig.21yes Fig. 20 Exploded view from left perspective;

[0073] Fig. 22 yes Fig. 20 Exploded view from right perspective;

[0074] Fig.23 is a three-dimensional diagram of the second rotating joint of the baby stroller frame in the first embodiment of the present invention;

[0075] Fig.24 is an exploded view from a left perspective of the second rotation joint of the baby stroller frame in the first embodiment of the present invention;

[0076] Fig.25 is an exploded view from the right side of the second rotation joint of the baby stroller frame in the first embodiment of the present invention;

[0077] Fig.26 is a partial enlarged view of the second rotating joint of the baby stroller frame in the first embodiment of the present invention;

[0078] Fig. 27 yes Fig.26 The partial enlarged view of the rear fork is omitted;

[0079] Fig.28 yes Fig. 27 The partial enlarged view after the lower push rod rotating member and the lower locking member are omitted;

[0080] Fig.29 yes Fig.28 The partial enlarged view behind the rotating part of the front bracket is omitted;

[0081] Fig.30 is a three-dimensional diagram of a baby stroller frame in a folded state in Embodiment 1 of the present invention;

[0082] Fig.31 is a three-dimensional diagram of the baby stroller in the unfolded state in the first embodiment of the present invention;

[0083] Fig.32 is a three-dimensional diagram of the baby stroller in the folded state in the first embodiment of the present invention;

[0084] Fig.33 is a partial enlarged view of the baby stroller in the first embodiment of the present invention;

[0085] Fig.34 is a partial enlarged view of the rear view of the baby stroller in a modified example of the first embodiment of the present invention;

[0086] Fig.35 is a partial enlarged view of a baby stroller from a top view in a modified example of the first embodiment of the present invention;

[0087] Fig.364 is a flow chart of a baby stroller folding method in Embodiment 2 of the present invention.

[0088] Reference table of reference numerals:

[0089] Seat frame assembly 10:

[0090] First back portion 11: second through hole 111;

[0091] Seat portion 12: seat plate 121, extension rod 122, first connecting column 123, shielding plate 124, mounting groove 125, embedding groove 1211, handle hole 1212;

[0092] Lower rotating joint 13: first housing 131, second housing 132, rotating shaft 133, locking pin 134, locking slot 135, sliding slot housing 136, sliding member 137, claw plate 138, cross bar 139, guide slot 1321, second connecting column 1322, limiting slot 1361, third steel wire hole 1362, second steel wire hole 1371, pin hole 1372, limiting block 1373, slot 1381;

[0093] Switch unit 14: flip member 141, return spring 142, steel wire 143, first steel wire hole 1411, first hinge part 1412, first steel wire 143a, second steel wire 143b;

[0094] Handrail 15;

[0095] Cross beam 16: second hinge portion 161;

[0096] Ceiling unit 17: ceiling rod 171, ceiling rotating member 172, and shed cloth 173;

[0097] Second back 18;

[0098] The upper rotating joint 19 includes a first rotating member 191 , a second rotating member 192 , a cam 193 , a cam groove 1921 , a sliding shaft 1922 , and a fourth wire hole 1931 ;

[0099] Baby stroller frame 20: upper push rod 21, lower push rod 22, front bracket 23, rear bracket 24, first rotating joint 25, second rotating joint 26, unlocking trigger mechanism 27, first connecting rod 28, second connecting rod 29a, third connecting rod 29b;

[0100] Upper push rod 21: inner tube 211, outer tube 212;

[0101] First rotating joint 25: upper push rod rotating housing 251, lower push rod rotating housing 252, upper locking member 253, gear 254, upper cover plate 255, spring mounting seat 256, push spring 257, reset member 258, first gear groove 2511, entry groove 2512, second gear groove 2521, upper locking block 2531, upper locking groove 2541, first slope 2542, slot 2543, insert arm 2561, lower wire hook 2581, second slope 2582;

[0102] The second rotating joint 26 includes a lower steel wire 261, a lower locking member 262, a lower push rod rotating member 263, a front bracket rotating member 264, a rear bracket rotating member 265, a first rotating shaft 266, a second rotating shaft 267, a lower locking groove 268, a lower cover plate 269, a return spring 2611, a front fork member 2641, and a rear fork member 2651;

[0103] Unlock trigger mechanism 27: button 271, upper semicircular shell 272, telescopic member 273, lower semicircular shell 274, sleeve 275, spring mounting block 276, locking block 2711, spring mounting column 2712, convex strip 2713, slope groove 2721, upper insert 2722, first connecting member 2731, second connecting member 2732, first telescopic rod 2733, second telescopic rod 2734, slope boss 2735, button hole 2741, guide groove 2742, lower insert 2743, locking groove 2751, spring groove 2761. DETAILED DESCRIPTION

[0104] The specific implementation of the present invention will be further described below in conjunction with the accompanying drawings.

[0105] It is easy to understand that according to the technical solution of the present invention, without changing the essential spirit of the present invention, a variety of structural modes and implementation modes that can be replaced by those skilled in the art can be replaced with each other. Therefore, the following specific implementation modes and drawings are only exemplary descriptions of the technical solution of the present invention, and should not be regarded as the whole of the present invention or as a limitation or restriction to the technical solution of the invention.

[0106] The directional terms such as up, down, left, right, front, back, front, back, top, bottom, etc. mentioned or may be mentioned in this specification are defined relative to the structures shown in the drawings. They are relative concepts and may change accordingly according to different positions and different usage conditions. Therefore, these or other directional terms should not be interpreted as restrictive terms.

[0107] The directions of "front", "back", "up", "down", "left" and "right" in the present invention are based on the orientation of the baby stroller.

[0108] Embodiment 1:

[0109] See also Figure 1-2 FIG. 1 is a schematic diagram of the structure of a baby stroller frame in Embodiment 1 of the present invention.

[0110] The baby stroller comprises a baby stroller frame 20 , which comprises a push rod 21 , a front support 22 , a rear support 23 , wheels 24 and a handrail 15 , and further comprises a seat frame assembly 10 , which is mounted on the baby stroller frame 20 .

[0111] The baby stroller frame 20 also includes a frame rotation joint 26, and the front bracket 22, the rear bracket 23 and the push rod 21 are connected by the frame rotation joint 26 and can be rotated and folded. The folding operation of the baby stroller frame 20 and the seat frame assembly 10 is two completely independent operation modes.

[0112] When the entire baby stroller needs to be folded, the seat frame assembly 10 is folded first, and then the baby stroller frame 20 is folded.

[0113] Furthermore, if Figure 1-2 As shown, the front bracket 22 is rotatably connected to the seat portion 12, the lower rotating joint 13 and the push rod 21 are rotatably connected via a first connecting rod 25, the armrest rod 15 is rotatably connected to the seat portion 12, the armrest rod 15 extends a second connecting rod 28, and the second connecting rod 28 is rotatably connected to the first connecting rod 25 via a third connecting rod 29.

[0114] Specifically, Figure 2 As shown, a first connecting column 123 is provided on the seat portion 12 , and the front bracket 22 is rotatably connected to the seat plate 121 via the first connecting column 123 .

[0115] The seat frame assembly 10 is positioned at three points by the first connecting column 123 , the connecting point between the armrest bar 15 and the seat portion 12 , and the connecting point between the third connecting rod 29 and the first connecting rod 25 and the lower rotating joint 13 .

[0116] By implementing this embodiment, the seat frame assembly 10 can be positioned, and the seat frame assembly 10 and the baby stroller frame 20 can be folded and stored independently, which increases the flexibility of adjustment and meets the different needs of users.

[0117] Seat frame components:

[0118] like Figure 3-14 The above is a schematic diagram of the structure of the seat frame assembly in the first embodiment of the present invention.

[0119] A seat frame assembly 10 for a baby stroller includes a first back portion 11, a second back portion 18, a seat portion 12, a switch unit 14, an upper rotation joint 19 connected between the first back portion 11 and the second back portion 18, and a lower rotation joint 13 connected between the second back portion 18 and the seat portion 12. The switch unit 14 is installed on a cross beam 16 between the first back portion 11 and the second back portion 18, and the cross beam 16 is connected to the upper rotation joint 19. The switch unit 14 can unlock the upper rotation joint 19 and the lower rotation joint 13.

[0120] When folding, after operating the switch unit 14, the switch unit 14 drives the upper rotating joint 19 and the lower rotating joint 13 to unlock, so that the first back portion 11 can be rotated and folded relative to the second back portion 18, and the second back portion 18 can be rotated and folded relative to the seat portion 12;

[0121] When unfolding, the first back portion 11 is rotated. After the first back portion 11 is rotated and unfolded relative to the second back portion 18, the upper rotating joint 19 locks the first back portion 11. After the second back portion 18 is rotated and unfolded relative to the seat portion 12, the lower rotating joint 13 locks the second back portion 18.

[0122] When folding is required, the switch unit 14 is operated, and the switch unit 14 drives the upper rotating joint 19 and the lower rotating joint 13 to unlock;

[0123] Then, the first back portion 11 is rotated toward the direction approaching the second back portion 18 until the first back portion 11 is rotated to a position almost parallel to the second back portion 18;

[0124] Then, the first back portion 11 and the second back portion 18 are rotated together in a direction close to the seat portion 12 , until the first back portion 11 and the second back portion 18 are rotated to a level position almost equal to the seat portion 12 .

[0125] When the seat frame assembly 10 needs to be unfolded again, the first back portion 11 and the second back portion 18 are first rotated in a direction away from the seat portion 12 until they are adjusted to a suitable unfolding angle, and the lower rotation joint 13 is locked again; then the first back portion 11 is flipped upward relative to the second back portion 18 until the first back portion 11 and the second back portion 18 are located on the same straight line, and the upper rotation joint 19 is locked again.

[0126] In this embodiment, after the upper rotating joint 19 and the lower rotating joint 13 are unlocked, the first back portion 11 and the second back portion 18 are rotated and folded relative to the seat portion 12, thereby realizing the independent folding and folding operation of the seat frame assembly. It can be folded or unfolded separately from the stroller frame, which is easy to adjust and suitable for different usage conditions and needs.

[0127] Among them, Figure 3As shown, the first back portion 11 comprises a hollow U-shaped rod, and both ends of the U-shaped rod are connected to two upper rotation joints 19 .

[0128] Specifically, the first back portion 11 is a complete U-shaped rod. When unfolded, the U-shaped rod is installed upside down, and the two ends are respectively connected to the upper rotating joints 19.

[0129] When the baby stroller is actually used, the U-shaped rod cover is provided with a backrest cloth, or a backrest board, for supporting the back of the baby.

[0130] Optionally, the first back portion 11 may also be other structures, for example, a backrest board is used to replace the U-shaped rod, and the backrest board can support the baby's head.

[0131] Furthermore, if Figure 3 As shown, the second back 18 is two straight rods, respectively connected to the two ends of the U-shaped first back 11. The first back 11 and the second back 18 are connected through an upper rotating joint 19, and the two upper rotating joints 19 are connected through a crossbeam 16, and the switch unit 14 is installed on the crossbeam 16.

[0132] Furthermore, if Figure 4-6 As shown, the switch unit 14 includes a flip member 141, a return spring 142 and a steel wire 143. The flip member 141 is rotatably connected to the cross beam 16. The return spring 142 is installed between the flip member 141 and the cross beam 16. One end of the steel wire 143 is connected to the flip member 141, and the other end is connected to the upper rotating joint 19 and the lower rotating joint 13.

[0133] When the flip member 141 is rotated, the flip member 141 pulls the steel wire 143, and the steel wire 143 drives the upper rotating joint 19 and the lower rotating joint 13 to unlock.

[0134] Specifically, Figure 5-6 As shown, the flip member 141 includes a first wire hole 1411 and a first hinge portion 1412. The first wire hole 1411 is fixedly connected to one end of the wire 143, and the first hinge portion 1412 is rotatably connected to the second hinge portion 161 on the beam 16. One end of the return spring 142 is connected to the flip member 141, and the other end is connected to the beam 16.

[0135] When the flip member 141 is flipped toward the rear of the seat frame assembly 10, the flip member 141 rotates around the first hinge portion 1412 and pulls the steel wire 143, which drives the upper rotating joint 19 and the lower rotating joint 13 to unlock. When the flip member 141 is flipped, the return spring 142 is stretched. When the flip member 141 is released, the return spring 142 drives the flip member 141 to return to the initial position.

[0136] Furthermore, if Figure 6As shown, the steel wire 143 includes a first steel wire 143 a and a second steel wire 143 b . The first steel wire 143 a is connected to the upper rotating joint 19 , and the second steel wire 143 b is connected to the lower rotating joint 13 .

[0137] The flip member 141 has two first wire holes 1411, each connected to a main wire 143. The main wire 143 is divided into two strands, namely a first wire 143a and a second wire 143b. The first wire 143a is connected to the upper rotating joint 19, and the second wire 143b is connected to the lower rotating joint 13. When the flip member 141 flips, it can drive the upper rotating joint 19 and the lower rotating joint 13 to unlock at the same time.

[0138] Optionally, the steel wire 143 may have only one strand, and each of the first steel wire holes 1411 of the flip member 141 is connected to a steel wire 143 , and each steel wire 143 drives the upper rotating joint 19 and the lower rotating joint 13 to unlock at the same time.

[0139] Furthermore, if Figure 3 and Figure 7-8 As shown, the lower rotating joint 13 includes a first housing 131, a second housing 132, a rotating shaft 133, a locking pin 134 and a locking groove 135;

[0140] The first housing 131 is connected to the second back portion 18, the second housing 132 is connected to the seat portion 12, the rotation shaft 133 connects the first housing 131 and the second housing 132, the first housing 131 can rotate around the rotation shaft 133, the locking pin 134 is connected to the switch unit 14 and installed between the first housing 131 and the second housing 132, and the locking groove 135 is formed on the second housing 132;

[0141] When locked, the locking pin 134 is inserted into the locking groove 135;

[0142] When unlocking, the switch unit 14 drives the locking pin 134 to escape from the locking groove 135 .

[0143] Specifically, Figure 2 As shown, the first shell 131 and the second shell 132 are both disc-shaped. The first shell 131 and the second shell 132 are buckled together to form a mounting cavity, and the locking pin 134 and the locking groove 135 are both installed in the mounting cavity.

[0144] There are two lower rotating joints 13, which are respectively located on the left and right sides of the second back portion 18 and the seat portion 12. The two first shells 131 are connected by a cross bar 139, so that the cross bar 139, the two first shells 131, the second back portion 18, and the switch unit 14 become a whole and rotate together.

[0145] The two second shells 132 are connected to the seat portion 12 as a whole. During actual processing, the second shells 132 and the seat plate 121 of the seat portion 12 can be integrally injection molded.

[0146] The seat plate 121 is formed with a plurality of hollows, and the seat plate 121 can be covered with a cushion cloth to increase comfort. The hollow parts can increase the air permeability of the seat plate 121, reduce weight, and reduce costs. At the same time, sufficient support stability is also provided.

[0147] The locking grooves 135 include three, which are distributed at equal radius around the center of the second shell 132. The multiple locking grooves 135 facilitate adjustment of the angle between the second back portion 18 and the seat portion 12, and the locking pin 134 can be inserted into any locking groove 135 to meet different needs of users. The user can adjust the second back portion 18 and the first back portion 11 to a lying state, a semi-lying state, or a sitting state.

[0148] Furthermore, if Figure 7-8 As shown, the lower rotating joint 13 also includes a sliding slot shell 136, a sliding member 137 and a claw plate 138, and the sliding slot shell 136 is connected between the second back 18 and the second shell 132, wherein the sliding slot shell 136 includes a third steel wire hole 1362, and the other end of the second steel wire 143b is fixedly connected to the third steel wire hole 1362. The third steel wire hole 1362 of the sliding slot shell 136 is connected to the switch unit 14 through the second steel wire 143b. One end of the locking pin 134 is fixed on the sliding member 137, and the other end passes through the limiting groove 1361 of the sliding slot shell 136 and can slide along the sliding slot shell 136. The claw plate 138 is installed on the second shell 132. The claw plate 138 is provided with three grooves 1381 that completely match the shape of the locking groove 135. The multiple grooves 1381 on the claw plate 138 correspond to the locking groove 135. The other end of the locking pin 134 passes through the sliding slot shell 136 and is inserted into the groove 1381 and the locking groove 135.

[0149] Specifically, the sliding slot shell 136 is fixedly connected to the lower end of the second back portion 18 , a semicircular slot is formed on the sliding slot shell 136 , the sliding member 137 is elliptical, and the sliding member 137 is at least partially inserted into the sliding slot shell 136 .

[0150] When the second steel wire 143b is pulled, the sliding slot housing 136 is driven to move upward.

[0151] When the sliding slot shell 136 is pulled upward, the locking pin 134 is driven to slide upward, and the locking pin 134 drives the sliding member 137 to slide upward, and the locking pin 134 is disengaged from the locking slot 135, thereby unlocking the lower rotating joint 13.

[0152] The claw plate 138 is connected to the second housing 132 by screws.

[0153] The sliding slot housing 136 is also connected to a reset member, and when the user releases the flip member 141, the reset member moves the sliding slot housing 136 downward to keep the locking pin 134 engaged in the locking slot 1381 and the locking slot 135. The reset member may be a reset spring.

[0154] In this embodiment, the sliding member 137, the sliding groove shell 136, the locking pin 134 and the first housing 131 are connected as a whole, and the claw plate 138 and the locking groove 135 are connected as a whole with the second housing 132. The two parts are locked by the cooperation of the locking pin 134 with the locking groove 135 and the locking groove 1381. When the locking pin 134 is disengaged from the locking groove 135 and the locking groove 1381, the second back part 18 is unlocked and can be rotated relative to the seat part 12, so that the angle of the second back part 18 can be adjusted or it can be completely folded.

[0155] Alternatively, if Figure 9-11 , which is a schematic structural diagram of the lower rotating joint 13 in a modified example.

[0156] The lower rotating joint 13 includes a first housing 131, a second housing 132, a rotating shaft 133, a locking pin 134 and a locking groove 135;

[0157] The first housing 131 is connected to the second back portion 18, the second housing 132 is connected to the seat portion 12, the rotation shaft 133 connects the first housing 131 and the second housing 132, the first housing 131 can rotate around the rotation shaft 133, the locking pin 134 is connected to the switch unit 14 and installed between the first housing 131 and the second housing 132, and the locking groove 135 is formed on the second housing 132;

[0158] When locked, the locking pin 134 is inserted into the locking groove 135;

[0159] When unlocking, the switch unit 14 drives the locking pin 134 to escape from the locking groove 135 .

[0160] Specifically, Figure 3 and Fig. 9 As shown, the first shell 131 and the second shell 132 are both disc-shaped. The first shell 131 and the second shell 132 are buckled together to form a mounting cavity, and the locking pin 134 and the locking groove 135 are both installed in the mounting cavity.

[0161] There are two lower rotating joints 13, which are respectively located on the left and right sides of the second back portion 18 and the seat portion 12. The two first shells 131 are connected by a cross bar 139, so that the cross bar 139, the two first shells 131, the second back portion 18, and the switch unit 14 become a whole and rotate together.

[0162] The two second shells 132 are connected to the seat portion 12 as a whole. During actual processing, the second shells 132 and the seat plate 121 of the seat portion 12 can be integrally injection molded.

[0163] The seat plate 121 is formed with a plurality of hollows, and the seat plate 121 can be covered with a cushion cloth to increase comfort. The hollow parts can increase the air permeability of the seat plate 121, reduce weight, and reduce costs. At the same time, sufficient support stability is also provided.

[0164] like Fig.10 As shown, there are four locking grooves 135, which are distributed at equal radius around the center of the second shell 132. The multiple locking grooves 135 facilitate the adjustment of the angle between the second back portion 18 and the seat portion 12, and the locking pin 134 can be inserted into any locking groove 135 to meet the different needs of users. The user can adjust the second back portion 18 to a lying state, a semi-lying state, or a sitting state.

[0165] Furthermore, if Figure 9-11 As shown, the lower rotating joint 13 also includes a sliding groove shell 136, a sliding member 137 and a claw plate 138. The sliding groove shell 136 is connected between the second back 18 and the second shell 132. The sliding member 137 is connected to the switch unit 14 and can slide along the sliding groove shell 136. The claw plate 138 is installed on the second shell 132. The multiple grooves 1381 on the claw plate 138 correspond to the locking groove 135. One end of the locking pin 134 is installed on the sliding member 137, and the other end is inserted into the groove 1381 and the locking groove 135.

[0166] Specifically, the sliding slot shell 136 is fixedly connected to the end of the U-shaped rod, a semicircular slot is formed on the sliding slot shell 136 , the sliding member 137 is elliptical, and the sliding member 137 is at least partially inserted into the sliding slot shell 136 .

[0167] The sliding member 137 includes a second steel wire hole 1371, and the other end of the second steel wire 143b is fixedly connected to the second steel wire hole 1371. When the second steel wire 143b is pulled, the sliding member 137 is driven to slide upward.

[0168] The sliding member 137 also includes a pin hole 1372 , into which the locking pin 134 is inserted and fixedly connected. When the sliding member 137 slides upward, the locking pin 134 is driven to slide upward together, and the locking pin 134 is disengaged from the locking groove 135 , thereby unlocking the lower rotating joint 13 .

[0169] The claw plate 138 is provided with four locking grooves 1381 whose shapes completely match the locking grooves 135 , and the claw plate 138 is connected to the second housing 132 by screws.

[0170] like Fig.11As shown, the sliding member 137 further includes a limiting block 1373 , and a limiting groove 1361 is provided on the sliding groove shell 136 . When the sliding member 137 slides upward, the limiting groove 1361 plays a limiting role.

[0171] The sliding member 137 is also connected to a reset member, and when the user releases the flip member 141, the reset member causes the sliding member 137 to slide downward along the sliding slot shell 136, keeping the locking pin 134 engaged in the slot 1381 and the locking slot 135. The reset member may be a reset spring.

[0172] In the modified example, the sliding member 137, the sliding groove shell 136, the locking pin 134 are connected to the first shell 131 as a whole, and the claw plate 138 and the locking groove 135 are connected to the second shell 132 as a whole. The two parts are locked by the cooperation of the locking pin 134, the locking groove 135 and the card slot 1381. When the locking pin 134 is disengaged from the locking groove 135 and the card slot 1381, the second back part 18 is unlocked and can be rotated relative to the seat part 12, so that the angle of the second back part 18 can be adjusted or it can be completely folded.

[0173] Furthermore, if Fig.12 As shown, the seat portion 12 includes a seat plate 121 and an extension rod 122. The seat plate 121 is provided with an embedding groove 1211, and the corresponding extension rod 122 is provided with an embedding block (not shown). The embedding block is embedded in the embedding groove 1211 to achieve the connection between the extension rod 122 and the seat plate 121.

[0174] Optionally, the extension rod 122 can adjust its angle relative to the seat plate 121; when the baby is sitting, the extension rod 122 flips downward so that the baby's calves can naturally bend downward; when the baby is lying, the extension rod 122 flips upward to maintain the same plane as the seat plate 121, so as to support the baby's legs and feet.

[0175] Furthermore, if Figure 13-14 As shown, the upper rotating joint 19 includes a first rotating member 191, a second rotating member 192 and a cam 193, the first rotating member 191 is connected to the first back 11, the second rotating member 192 is connected to the second back 18, and the first rotating member 191 and the second rotating member 192 are rotatably connected;

[0176] When the upper rotating joint 19 is locked, the cam 193 is located between the first rotating member 191 and the second rotating member 192 along the axial direction;

[0177] The switch unit 14 can drive the cam 193 to disengage from the first rotating member 191 or the second rotating member 192 along the axial direction, and the upper rotating joint 19 is unlocked.

[0178] Specifically, Fig.13As shown, the cam 193 includes a fourth steel wire hole 1931, and the fourth steel wire hole 1931 is connected to the first steel wire 143a. The second rotating member 192 is provided with a cam groove 1921, and the cam 193 is at least partially embedded in the cam groove 1921. The second rotating member 192 also includes a sliding shaft 1922, and the cam 193 is sleeved on the sliding shaft 1922 and can move along the axis of the sliding shaft 1922. The first rotating member 191 is rotatably connected to the sliding shaft 1922, and the cam 193 can be at least partially embedded in the first rotating member 191.

[0179] In the locked state, a portion of the cam 193 is embedded in the cam groove 1921 of the second rotating member 192, and another portion is embedded in the first rotating member 191, thereby locking the first rotating member 191 and the second rotating member 192. At this time, the first back portion 11 and the second back portion 18 are locked.

[0180] When the flip member 141 is turned over, the first steel wire 143a pulls the cam 193, so that the cam 193 completely enters the cam groove 1921 and disengages from the first rotating member 191. The first rotating member 191 can rotate relative to the second rotating member 192, so that the first back portion 11 rotates relative to the second back portion 18.

[0181] A reset member may be installed between the cam 193 and the cam groove 1921, and the reset member is compressed when the cam 193 is pulled toward the cam groove 1921. When the first steel wire 143a does not apply force to the cam 193, the cam 193 moves away from the second rotating member 192 again under the action of the reset member, and is partially inserted into the first rotating member 191, thereby achieving locking between the first rotating member 191 and the second rotating member 192.

[0182] Among them, Figure 3 As shown, a ceiling unit 17 is also installed on the seat portion 11 , and the ceiling unit 17 includes a ceiling rod 171 , a ceiling rotating member 172 and a ceiling cloth 173 .

[0183] Furthermore, if Figure 13-14 As shown, a ceiling rotating member 172 is also installed on the outer side of the first rotating member 191 , and the ceiling rod rotating member 172 is rotatably connected to the first rotating member 191 and fixedly connected to the ceiling rod 171 .

[0184] The two ceiling rods 171 are used to support the tent cloth 173, and one side of the tent cloth 173 is fixed to the first back part 11. The ceiling rotating member 172 is used to adjust the angle between the ceiling rods 171 and the first back part 11 to facilitate unfolding or folding the tent cloth. When the ceiling rotating member 172 rotates, the ceiling rods 171 can be turned up and folded.

[0185] Furthermore, if Figure 8As shown, a handle hole 1212 is provided on the rear side of the seat plate 121. When the seat frame assembly 10 is fully folded, the user can insert his hand into the handle hole 1212 to lift the entire baby stroller or the entire seat frame assembly 10 for easy carrying.

[0186] By implementing this embodiment, the first back portion 11 can be folded relative to the second back portion 18, and the angle of the second back portion 18 can be adjusted and folded relative to the seat portion 12, thereby increasing the flexibility of adjustment and being able to meet different needs of users.

[0187] Baby stroller frame:

[0188] like Figure 15-30 FIG. 1 is a schematic diagram of the structure of a baby stroller frame in the first embodiment.

[0189] like Fig.15 As shown, the baby stroller frame 20 includes an upper push rod 21, a lower push rod 22, a front bracket 23, a rear bracket 24, a first rotating joint 25, a second rotating joint 26 and an unlocking trigger mechanism 27. The unlocking trigger mechanism 27 is installed on the upper push rod 21. The lower end of the upper push rod 21 is connected to the upper end of the lower push rod 22 through the first rotating joint 25, and the lower end of the lower push rod 22 is connected to the upper ends of the front bracket 23 and the rear bracket 24 through the second rotating joint 26. The unlocking trigger mechanism 27 is used to trigger the first rotating joint 25 to unlock, and rotate the lower push rod 22 to trigger the second rotating joint 26 to unlock.

[0190] In this embodiment, the first rotating joint 25 is unlocked by operating the unlocking trigger mechanism 27, the upper push rod 21 is flipped backward and downward to unlock the second rotating joint 26, and then the lower push rod 21 is flipped forward and downward, and finally the rear bracket 24 and the front bracket 23 are folded together. The present invention facilitates the operation of folding the stroller, and the volume of the folded baby stroller frame can be smaller.

[0191] Unlock the trigger mechanism:

[0192] like Figure 16-17 As shown, the unlocking trigger mechanism 27 includes a button 271. The unlocking trigger mechanism 27 is used to unlock itself after pressing the button 271, and to drive the first rotating joint 25 to unlock by rotating.

[0193] Specifically, the unlocking trigger mechanism 27 is installed at the top center of the upper push rod 21, and the button 271 faces downward, so that the user can press the button 271 when holding the unlocking trigger mechanism 27 with four fingers.

[0194] Furthermore, the unlocking trigger mechanism 27 further includes an upper semicircular shell 272, a telescopic member 273, a spring (not shown) and a lower semicircular shell 274. The upper semicircular shell 272 and the lower semicircular shell 274 are spliced ​​into a cylindrical tube. A portion of the button 271 extends from the lower semicircular shell 272. The button 271 is installed between the lower semicircular shell 274 and the spring. The telescopic member 273 is connected to the upper semicircular shell 272. Both ends of the telescopic member 273 are respectively connected to at least one upper steel wire (not shown).

[0195] After the button 271 is pressed, the unlocking trigger mechanism 27 is unlocked, and the button 271, the upper semicircular shell 272 and the lower semicircular shell 274 rotate to compress the telescopic member 273, and the telescopic member 273 pulls the upper steel wire to drive the first rotating joint 25 to unlock.

[0196] Specifically, Fig.17 As shown, the button 271 is in the shape of an elongated strip, and the convex strip 2713 of the button 271 is in the shape of an elongated oval, which is exposed outside the unlocking trigger mechanism 27 and has enough area for four fingers to act on the convex strip 2713 at the same time.

[0197] A portion of the button 271 is installed inside the small semicircular shell 274, and the convex strip 2713 protrudes downward from the button hole 2741 of the lower semicircular shell 274. Locking blocks 2711 extend outward from both ends of the button 271, and lower inserts 2743 extend from the inner sides of both ends of the lower semicircular shell 274. The lower inserts 2743 are provided with guide grooves 2742, and the locking blocks 2711 are inserted into the guide grooves 2742. When the button 271 is pressed, it will not fall out of the guide grooves 2742, and the button 271 and the lower semicircular shell 274 will rotate together.

[0198] like Fig.16 As shown, a groove is formed on the upper surface of the convex strip 2713 of the button 271, and two spring mounting posts 2712 are installed in the groove. The spring mounting posts 2712 are used to sleeve springs (not shown).

[0199] like Fig.17 As shown, two circular spring grooves 2761 are provided on the surface of the spring mounting block 276 facing the button 271, the top end of the spring is inserted into the spring groove 2761, and the spring mounting block 276 abuts against the inner tube 211 of the push rod 21. When the button 271 is pressed, the button 271 pushes the spring upward; when the button 271 is released, the button 271 returns to its original position under the action of the spring, and the convex strip 2713 protrudes downward from the button hole 2741.

[0200] Furthermore, if Fig.16 As shown, the upper push rod 21 includes an inner tube 211 and two outer tubes 212, and the cylindrical tube is sleeved outside the inner tube 211;

[0201] The unlocking trigger mechanism 27 also includes two sleeves 275, which are fixedly connected to the two outer tubes 212 respectively. The two ends of the cylindrical tube are respectively inserted into the two sleeves 275 and can rotate. A locking groove 2751 is provided on the sleeve 275, and locking blocks 2711 extend from both ends of the button 271. The locking block 2711 is inserted into the locking groove 2751. When the button 271 is pressed, the locking block 2711 is disengaged from the locking groove 2751, and the cylindrical tube can rotate relative to the sleeve 275.

[0202] The lower insert piece 2743 of the lower semicircular shell 274 is inserted into the sleeve 275 , and the main body of the lower semicircular shell 274 is butted against the edge of the sleeve 275 .

[0203] Upper insert pieces 2722 extend outward from both ends of the upper semicircular shell 275 . The upper insert pieces 2722 are also inserted into the sleeve 275 . The main body of the upper semicircular shell 275 is butted against the edge of the sleeve 275 .

[0204] When the button 271 is pressed, the locking block 2711 first escapes from the locking groove 2751, the unlocking trigger mechanism 27 is unlocked, and then the locking block 2711 enters the guide groove 2742. The button 271, the upper semicircular shell 272 and the lower semicircular shell 274 can rotate relative to the sleeve 275 and the upper push rod 21, and the telescopic member 273 does not rotate at this time.

[0205] In order to facilitate user operation, the upper semicircular shell 272 and the lower semicircular shell 274 can be rotated toward the front of the baby stroller to be spliced ​​into a cylindrical tube.

[0206] Furthermore, if Figure 16-17 As shown, the telescopic member 273 includes a first connecting member 2731, a second connecting member 2732, a first telescopic rod 2733 and a second telescopic rod 2734. The first connecting member 2731 is connected to one end of the first telescopic rod 2733, the second connecting member 2732 is connected to one end of the second telescopic rod 2734, the other end of the first telescopic rod 2733 is connected to the other end of the second telescopic rod 2734, the first connecting member 2731 and the second connecting member 2732 are respectively connected to an upper steel wire, and the first connecting member 2731 and the second connecting member 2732 are both provided with a slope boss 2735;

[0207] Two slope grooves 2721 are provided in the upper semicircular shell 272, and the slope bosses 2735 are embedded in the slope grooves 2721. When the upper semicircular shell 272 rotates, the slope grooves 2721 push the two slope bosses 2735 to drive the first telescopic rod 2733 and the second telescopic rod 2734 to move closer to each other and retract.

[0208] The first telescopic rod 2733 is inserted into the second telescopic rod 2734 , and a spring is installed in the second telescopic rod 2734 .

[0209] The ramp boss 2735 is roughly triangular in shape and includes two inclined surfaces. The ramp groove 2721 also has two inclined surfaces, wherein the length of one inclined surface is greater than the length of the other inclined surface.

[0210] When the upper semicircular shell 272 rotates forward, the longer inclined surface pushes the slope boss 2735, so that the two slope bosses 2735 approach each other, driving the first telescopic rod 2733 and the second telescopic rod 2734 to approach each other and retract.

[0211] When the user releases the unlocking trigger mechanism 27, the first telescopic rod 2733 and the second telescopic rod 2734 extend away from each other, and the slope boss 2735 pushes the upper semicircular shell 272 to rotate in the opposite direction, and the upper semicircular shell 272 drives the lower semicircular shell 274 and the button 271 to reverse back to their original positions.

[0212] The first connecting member 2731 and the second connecting member 2732 are both provided with wire holes for connecting one end of a steel wire (not shown).

[0213] When the first telescopic rod 2733 and the second telescopic rod 2734 are retracted toward each other, one end of the upper steel wire is pulled, and the upper steel wire drives the first rotating joint 25 to unlock.

[0214] When the unlocking trigger mechanism 27 needs to be operated, the user holds the upper semicircular shell 272 and the lower semicircular shell 274 together to form a cylindrical tube with one hand, presses the button 271 first, and then rotates the upper semicircular shell 272 and the lower semicircular shell 274 together to form a cylindrical tube. The unlocking is realized by one hand, and it can be completed in one go. There is no need to operate with two hands at the same time, or to use complicated operation gestures, or to operate in two times to complete the operation.

[0215] First revolute joint:

[0216] like Figure 18-22 As shown, the first rotating joint 25 includes an upper push rod rotating housing 251, a lower push rod rotating housing 252 and an upper locking member 253;

[0217] The upper push rod rotating shell 251 is connected to the lower end of the upper push rod 21, the lower push rod rotating shell 251 is connected to the upper end of the lower push rod 22, and the upper locking piece 253 is connected to the first connecting piece 2731 and the second connecting piece 2732 of the unlocking trigger mechanism 27 through the upper steel wire. When the upper steel wire pulls the upper locking piece 253, the first rotating joint 25 is unlocked.

[0218] Furthermore, if Figure 18-22 As shown, the first rotating joint 25 further includes a gear 254, a first gear slot 2511 is provided in the upper push rod rotating housing 251, and a second gear slot 2521 is provided in the lower push rod rotating housing 252.

[0219] When the first rotating joint 25 is locked, the gear 254 is embedded in the first gear groove 2511 and the second gear groove 2521;

[0220] When the upper locking member 253 moves upward, the gear 254 escapes from the first gear groove 2511 or the second gear groove 2521 , and the first rotation joint 25 is unlocked.

[0221] Specifically, the upper push rod rotating housing 251, the lower push rod rotating housing 252 and the gear 254 are coaxially connected.

[0222] The gear 254 includes a plurality of teeth, and an upper locking groove 2541 is provided on the edge of the gear 254. When the upper locking block 2531 of the upper locking member 253 extends downward and is inserted into the upper locking groove 2541, the upper locking member 253 locks the gear 254, and the gear 254 cannot rotate. The upper push rod rotating shell 251 and the lower push rod rotating shell 252 also cannot rotate relative to each other. At this time, the first rotating joint 25 is locked, and the upper push rod 21 and the lower push rod 22 cannot rotate and fold.

[0223] When the upper locking member 253 is pulled upward by the upper wire, the upper locking block 2531 is disengaged from the upper locking groove 2541. At this time, the reset member 258 pushes the gear 254 to move axially toward the first gear groove 2511, and is completely embedded in the first gear groove 2511, and disengages from the second gear groove 2521. The lower push rod rotating housing 252 is rotatably connected to the upper push rod rotating housing 251 only through a rotating shaft (not shown), and the lower push rod rotating housing 252 can rotate relative to the upper push rod rotating housing 251, so that the upper push rod 21 rotates relative to the lower push rod 22.

[0224] Furthermore, if Figure 20-21 As shown, the upper locking piece 253 is installed in the connecting tube 2513 of the upper push rod rotating shell 251, and the first gear groove 2511 is also provided with an entry groove 2512 which is connected to the connecting tube 2513. The entry groove 2512 corresponds to the upper locking groove 2541 along the axial direction. When locking, the upper locking block 2531 of the upper locking piece 253 is inserted into the entry groove 2512.

[0225] Furthermore, if Figure 18-19 As shown, the first rotating joint 25 further includes an upper cover plate 255 , which covers the outer side surface of the lower push rod rotating housing 252 to shield the end of the rotating shaft.

[0226] Furthermore, if Figure 21-22As shown, the first rotating joint 25 also includes a spring mounting seat 256, a push spring 257 and a reset member 258. The push spring 257 is installed on the spring mounting seat 256. The spring mounting seat 256 includes an insertion arm 2561 extending toward the gear 254. The gear 254 is provided with a slot 2543, and the insertion arm 2561 is inserted into the slot 2543.

[0227] The reset member 258 includes a lower wire hook 2581 and a second slope 2582. The lower wire hook 2581 is connected to one end of the lower wire to drive the lower wire. The two second slopes 2582 are located on one side of the reset member 258 facing the gear 254. The gear 254 is provided with a corresponding first slope 2542, and the first slope 2542 contacts the second slope 2582.

[0228] When the upper locking piece 253 is disengaged upward, the push spring 257 stretches and pushes the reset piece 258 axially toward the gear 254, and the second ramp 2582 pushes the first ramp 2542 to move axially, so that the gear 254 moves toward the first gear groove 2511 and disengages from the second gear groove 2521, thereby unlocking the first rotating joint 25.

[0229] After unlocking, the upper push rod 21 drives the upper push rod rotating shell 251, gear 254, spring mounting seat 256, push spring 257 and reset member 258 to rotate backward and downward together. When the reset member 258 rotates, it pulls the lower steel wire to unlock the second rotating joint 26.

[0230] The unlocking trigger mechanism 27 drives the first rotating joint 25 to unlock through the upper steel wire, and the first rotating joint 25 then drives the second rotating joint 26 to unlock through the lower steel wire. The two-stage unlocking method allows the second rotating joint 26 to be unlocked only after the first rotating joint 25 is unlocked and the upper push rod 21 is rotated and folded. The first rotating joint 25 and the second rotating joint 26 are not unlocked at the same time. The user must first rotate the upper push rod 21 to unlock the second rotating joint 26 and rotate the lower push rod 22. This makes the folding order unique, which is convenient for users to operate in sequence according to the set folding order. If the first rotating joint 25 and the second rotating joint 26 are unlocked at the same time, the user may not know whether to fold the upper push rod 21 or the lower push rod 22 first.

[0231] Second revolute joint:

[0232] like Figure 23-29 As shown, the second rotating joint 26 includes a lower steel wire 261 and a lower locking piece 262 . After the upper push rod 21 rotates, the lower steel wire 261 pulls the lower locking piece 262 to unlock the second rotating joint 26 .

[0233] Further, the second rotating joint 26 also includes a lower push rod rotating member 263, a front bracket rotating member 264 and a rear bracket rotating member 265;

[0234] The lower push rod rotating member 263 is connected to the lower end of the lower push rod 22, and the lower push rod rotating member 263 is rotatably connected to the front bracket rotating member 264 via a first rotating shaft 266;

[0235] The front bracket rotating member 264 is connected to the upper end of the front bracket 23, and the front bracket rotating member 264 and the rear bracket rotating member 265 are rotatably connected via a second rotating shaft 267;

[0236] The rear support rotating member 265 is connected to the upper end of the rear support 24;

[0237] The lower push rod rotating member 263, the front bracket rotating member 264 and the rear bracket rotating member 265 are all provided with a lower locking groove 268, and the lower locking member 262 is inserted into the lower locking groove 268, so that the second rotating joint 26 is locked.

[0238] Specifically, the lower push rod rotating member 263 includes two fan-shaped pieces, and the front bracket rotating member 264 includes a circular piece. The two lower push rod rotating members 263 clamp the front bracket rotating member 264 in the middle and are rotatably connected through the first rotating shaft 266 to achieve relative rotation between the lower push rod 22 and the front bracket 23.

[0239] like Figure 28-29 As shown, the rear bracket rotating member 265 is in the shape of a wrench, inserted into the front bracket rotating member 264, and rotatably connected via the second rotating shaft 267 to achieve relative rotation between the front bracket 23 and the rear bracket 24.

[0240] like Figure 24-26 As shown, the second rotating joint 26 also includes a rear fork member 2651 , which clamps the installed lower push rod rotating member 263 , the front bracket rotating member 264 and the rear bracket rotating member 265 therein, and is rotatably connected via a second rotating shaft 267 .

[0241] like Figure 24-25 As shown, the second rotating joint 26 further includes a front fork member 2641, which clamps the installed lower push rod rotating member 263, the front bracket rotating member 264, the rear bracket rotating member 265 and the rear fork member 2651 therein, and is rotatably connected to the first rotating shaft 266 and the second rotating shaft 267. The outer side of the front fork member 2641 is covered with a lower cover plate 269, which plays an aesthetic role by shielding the internal installation structure.

[0242] In addition to the front fork 2641, the lower push rod rotating member 263, the front bracket rotating member 264, the rear bracket rotating member 265 and the rear fork 2651 are all provided with a lower locking groove 268. Among them, the lower locking groove 268 on the lower push rod rotating member 263 is an elongated groove, and the lower locking member 262 can slide up and down in the elongated groove, and the upper end of the lower locking member 262 is connected to the lower end of the lower steel wire 261. When the lower steel wire 261 pulls the lower locking member 262, the lower locking member 262 slides upward along the elongated groove and escapes from the lower locking grooves 268 of the front bracket rotating member 264, the rear bracket rotating member 265 and the rear fork 2651, thereby unlocking the second rotating joint 26.

[0243] like Fig. 27 As shown, a return spring 2611 is sleeved on the lower steel wire 261, and when the lower steel wire 261 is pulled upward, the return spring 2611 is compressed. When the tension of the lower steel wire 261 is released, the return spring 2611 pushes the lower locking member 262 downward, and the lower locking member 262 is reinserted into the lower locking groove 268.

[0244] The lower rotating joint 26 in this embodiment can not only realize the folding of the stroller, but also provide sufficient support for the front bracket 23, the rear bracket 24 and the lower push rod 22, thereby increasing the stability of the baby stroller frame when it is in the unfolded state.

[0245] Furthermore, if Fig.31 As shown, the baby stroller frame 20 further includes a first connecting rod 28 , one end of which is rotatably connected to the lower push rod 22 , and the other end of which is connected to the backrest rotating joint 13 of the seat frame assembly 10 .

[0246] Furthermore, if Fig.32 As shown, the baby stroller frame 20 also includes a second connecting rod 29a and a third connecting rod 29b, one end of the second connecting rod 29b is rotatably connected to the other end of the first connecting rod 28, the other end of the second connecting rod 29a is rotatably connected to one end of the third connecting rod 29b, and the other end of the third connecting rod 29b is fixedly connected to the handrail rod 27.

[0247] The first connecting rod 28, the second connecting rod 29a and the third connecting rod 29b play a supporting and connecting role for the seat frame assembly 10. Fig.17 As shown, when the baby stroller is unfolded, the seat frame assembly 10 can be kept in a stable state. Fig.18 As shown, when the baby stroller is folded, the seat frame assembly 10 can be stored in the baby stroller frame 20 .

[0248] In this embodiment, the seat frame assembly 10 can be folded independently relative to the baby stroller frame 20 and can be flexibly adjusted to meet different usage requirements.

[0249] Optionally, the seat frame assembly 10 may also be foldable together with the stroller frame 20 .

[0250] like Figure 34-35 The figure shows a variation of the second embodiment, in which the seat frame assembly 10 may further include a first connecting rod 28, a first connecting column 123 and a second connecting column 1322; one end of the first connecting rod 28 is rotatably connected to the lower push rod 22, and the other end is connected to the backrest rotation joint 13 of the seat frame assembly 10; the front bracket 23 is connected to the seat frame assembly 10 via the first connecting column 123; the rear bracket 24 is connected to the seat frame assembly 10 via the second connecting column 1322.

[0251] When the baby stroller frame 20 is unfolded, the first connecting column 123, the second connecting column 1322 and the connecting rod 25 play a role in three-point positioning of the seat frame assembly 10, and the relative positions of the seat frame assembly 10 and other components of the baby stroller frame 20 remain unchanged.

[0252] When the stroller frame 20 is folded, the first connecting column 123, the second connecting column 1322 and the connection points of the first connecting rod 28 rotate, and the seat frame assembly 10 rotates relative to the upper push rod 21, the lower push rod 22, the front bracket 22 and the rear bracket 23.

[0253] The folding process of the baby stroller frame is as follows:

[0254] When the baby stroller frame 20 is folded, the button 271 is first pressed, and then the cylindrical tube composed of the upper semicircular shell 272 and the lower semicircular shell 274 is rotated forward to unlock the first rotating joint 25;

[0255] After unlocking, the upper push rod 21 is flipped backward and downward, and the upper push rod 21 is folded to the rear side of the lower push rod 22. After the upper push rod 21 is folded, the second rotation joint 26 is unlocked;

[0256] Then the lower push rod 22 is flipped forward and downward, and the lower push rod 22 and the upper push rod 21 are flipped downward and close to the front bracket 23;

[0257] Finally, the baby stroller frame 20 is lifted up, and the rear support 24 and the front support 23 are naturally brought together under the action of gravity, completing the folding of the entire baby stroller frame 20. The folded state is shown in FIG. Fig.30 .

[0258] By implementing this embodiment, the baby stroller frame can be quickly folded, and the volume after folding is smaller. Since the upper push rod 21 and the lower push rod 22 divide the push rod into two sections, the volume after folding can be reduced, which is convenient for storage. In addition, the second rotating joint 26 is unlocked by folding the upper push rod 21, which is conducive to step-by-step operation during folding, which is simple and easy to understand.

[0259] Embodiment 2:

[0260] like Fig.36 As shown, the baby stroller folding method comprises the following steps:

[0261] S201: operate the switch unit 14 to unlock the upper rotary joint 19 and the lower rotary joint 13;

[0262] S202: Flipping the first back portion 11 forward and downward so that the first back portion 11 is closer to the second back portion 18;

[0263] S203: Flipping the second back portion 18 forward and downward so that the second back portion 18 is closer to the seat portion 12;

[0264] S204: operating the unlocking trigger mechanism 27 to unlock the first rotating joint 25;

[0265] S205: Flip the upper push rod 21 backward and downward to bring it closer to the lower push rod 22;

[0266] S206: The second rotating joint 26 is unlocked, and the lower push rod 22 is flipped forward and downward to be close to the front bracket 23;

[0267] S207: Lift the handle hole 1212 on the seat frame assembly 10 (see Fig.32 ), the front bracket 23 and the rear bracket 24 are naturally folded under the action of gravity.

[0268] Furthermore, when the unlocking trigger mechanism 27 is operated in step S204,

[0269] First, press the button 271 of the unlocking trigger mechanism 27;

[0270] The unlocking trigger mechanism 27 is then rotated forward.

[0271] By implementing this embodiment, the seat frame assembly is folded first, and then the baby stroller frame is folded. The seat frame assembly 10 and the baby stroller frame 20 are folded and stored independently, which increases the flexibility of adjustment and meets the different needs of users.

[0272] The above description is only the principle and preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this field, several other modifications can be made based on the principle of the present invention, which should also be considered as the protection scope of the present invention.

Claims

1. A baby stroller, comprising a seat frame assembly (10) and a baby stroller frame (20), wherein the baby stroller frame (20) comprises an upper push rod (21), a lower push rod (22), a front support (23), a rear support (24) and a handrail (15), characterized in that: The seat frame assembly (10) comprises a first back portion (11), a second back portion (18), a seat portion (12), a switch unit (14), an upper rotation joint (19) connecting the first back portion (11) and the second back portion (18), and a lower rotation joint (13) connected between the second back portion (18) and the seat portion (12), wherein the switch unit (14) is mounted on a cross beam (16) between the first back portion (11) and the second back portion (18), wherein the cross beam (16) is connected to the upper rotation joint (19), and the switch unit (14) is capable of unlocking the upper rotation joint (19) and the lower rotation joint (13); wherein the armrest bar (15) is rotatably connected to the seat portion (12); wherein the baby stroller frame (20) further comprises a first connecting rod (28), a first connecting column (123) and a second connecting column (1322), wherein the first connecting rod (28 ) is rotatably connected to the lower push rod (22), the other end of the first connecting rod (28) is rotatably connected to the lower rotating joint (13) of the seat frame assembly (10), the front bracket (23) is connected to the seat frame assembly (10) via the first connecting column (123), and the rear bracket (24) is connected to the seat frame assembly (10) via the second connecting column (1322); wherein the baby stroller frame (20) further comprises a second connecting rod (29a) and a third connecting rod (29b), one end of the second connecting rod (29a) is rotatably connected to the other end of the first connecting rod (28), the other end of the second connecting rod (29a) is rotatably connected to one end of the third connecting rod (29b), and the other end of the third connecting rod (29b) is fixedly connected to the handrail (15), wherein when the baby stroller is folded, the upper push rod (21) The first connecting post (123), the second connecting post (1322) and the first connecting rod (28) are rotated when the baby stroller frame (20) is folded, and the seat frame assembly (10) is rotated relative to the upper push rod (21), the lower push rod (22), the front support (23) and the rear support (24).

2. The baby stroller according to claim 1, characterized in that: When folding, after operating the switch unit (14), the switch unit (14) drives the upper rotating joint (19) and the lower rotating joint (13) to unlock, so that the first back portion (11) can be rotated and folded relative to the second back portion (18), and the second back portion (18) can be rotated and folded relative to the seat portion (12); When unfolding, the first back portion (11) is rotated, and after the first back portion (11) is rotated and unfolded to a certain position relative to the second back portion (18), the upper rotation joint (19) locks the first back portion (11), and after the second back portion (18) is rotated and unfolded to a certain position relative to the seat portion (12), the lower rotation joint (13) locks the second back portion (18).

3. The baby stroller according to claim 1, characterized in that: The switch unit (14) comprises a flip member (141), a return spring (142) and a steel wire (143); the flip member (141) is rotatably connected to the cross beam (16); the return spring (142) is installed between the flip member (141) and the cross beam (16); one end of the steel wire (143) is connected to the flip member (141), and the other end is connected to the upper rotation joint (19) and the lower rotation joint (13); When the flip member (141) is rotated, the flip member (141) pulls the steel wire (143), and the steel wire (143) drives the upper rotating joint (19) and the lower rotating joint (13) to unlock.

4. The baby stroller according to claim 1, characterized in that: The lower rotating joint (13) comprises a first housing (131), a second housing (132), a rotating shaft (133), a locking pin (134) and a locking groove (135); The first shell (131) is connected to the second back portion (18), the second shell (132) is connected to the seat portion (12), the rotation shaft (133) connects the first shell (131) and the second shell (132), the first shell (131) is rotatable around the rotation shaft (133), the locking pin (134) is connected to the switch unit (14) and installed between the first shell (131) and the second shell (132), and the locking groove (135) is formed on the second shell (132); When locking, the locking pin (134) is inserted into the locking groove (135); When unlocking, the switch unit (14) drives the locking pin (134) to escape from the locking groove (135).

5. The baby stroller according to claim 4, characterized in that: The lower rotating joint (13) further comprises a sliding slot shell (136), a sliding member (137) and a claw plate (138); the sliding slot shell (136) is connected between the second back portion (18) and the second housing (132); the sliding slot shell (136) is connected to the switch unit (14); one end of the locking pin (134) is fixed to the sliding member (137); the other end passes through a limiting slot (1361) of the sliding slot shell (136) and can slide along the sliding slot shell (136); the claw plate (138) is mounted on the second housing (132); a plurality of slots (1381) on the claw plate (138) correspond to the locking slot (135); the other end of the locking pin (134) passes through the sliding slot shell (136) and is inserted into the slot (138) and the locking slot (135).

6. The baby stroller according to claim 1, characterized in that: The upper rotating joint (19) comprises a first rotating member (191), a second rotating member (192) and a cam (193); the first rotating member (191) is connected to the first back portion (11); the second rotating member (192) is connected to the second back portion (18); the first rotating member (191) and the second rotating member (192) are rotatably connected; When the upper rotating joint (19) is locked, the cam (193) is located between the first rotating member (191) and the second rotating member (192) along the axial direction; The switch unit (14) can drive the cam (193) to disengage from the first rotating member (191) or the second rotating member (192) along the axial direction, thereby unlocking the upper rotating joint (19).

7. The baby stroller according to claim 1, characterized in that: The baby stroller frame (20) comprises a first rotating joint (25), a second rotating joint (26) and an unlocking trigger mechanism (27); the unlocking trigger mechanism (27) is mounted on the upper push rod (21); the lower end of the upper push rod (21) is connected to the upper end of the lower push rod (22) via the first rotating joint (25); the lower end of the lower push rod (22) is connected to the upper ends of the front bracket (23) and the rear bracket (24) via the second rotating joint (26); the unlocking trigger mechanism (27) is used to trigger the first rotating joint (25) to unlock, and to trigger the second rotating joint (26) to unlock after rotating the lower push rod (22).

8. The baby stroller according to claim 7, characterized in that: The unlocking trigger mechanism (27) comprises a button (271), and the unlocking trigger mechanism (27) is used to unlock itself after the button (271) is pressed, and to drive the first rotating joint (25) to unlock by rotating; The unlocking trigger mechanism (27) further comprises an upper semicircular shell (272), a telescopic member (273), a spring and a lower semicircular shell (274); the upper semicircular shell (272) and the lower semicircular shell (273) are spliced ​​into a cylindrical tube; a portion of the button (271) extends from the lower semicircular shell (273); the button (271) is installed between the lower semicircular shell (273) and the spring; the telescopic member (273) is connected to the upper semicircular shell (272); and upper steel wires are respectively connected to both ends of the telescopic member (273); When the button (271) is pressed, the unlocking trigger mechanism (27) is unlocked, and the button (271), the upper semicircular shell (272), and the lower semicircular shell (274) are rotated to compress the telescopic member (273), and the telescopic member (273) pulls the upper steel wire to drive the first rotating joint (25) to unlock.

9. The baby stroller according to claim 8, characterized in that: The upper push rod (21) comprises an inner tube (211) and an outer tube (212), and the cylindrical tube is sleeved outside the inner tube (211); The unlocking trigger mechanism (27) further comprises a sleeve (275), wherein the sleeve (275) is fixedly connected to the outer tube (212), and the two ends of the cylindrical tube are respectively inserted into the sleeve (275) and are rotatable, and the sleeve (275) is provided with a locking groove (2751), and locking blocks (2711) extend from the two ends of the button (271), and the locking blocks (2711) are inserted into the locking groove (2751). When the button (271) is pressed, the locking blocks (2711) are disengaged from the locking groove (2751), and the cylindrical tube is rotatable relative to the sleeve (275).

10. The baby stroller according to claim 8, characterized in that: The telescopic member (273) comprises a first connecting member (2731), a second connecting member (2732), a first telescopic rod (2733) and a second telescopic rod (2734); the first connecting member (2731) is connected to one end of the first telescopic rod (2733); the second connecting member (2732) is connected to one end of the second telescopic rod (2734); the other end of the first telescopic rod (2733) is connected to the other end of the second telescopic rod (2734); the first connecting member (2731) and the second connecting member (2732) are respectively connected to one of the upper steel wires; and the first connecting member (2731) and the second connecting member (2732) are both provided with a slope boss (2735); Two inclined grooves (2721) are provided in the upper semicircular shell (272), and the inclined bosses (2735) are embedded in the inclined grooves (2721). When the upper semicircular shell (272) rotates, the inclined grooves (2721) push the two inclined bosses (2735) to drive the first telescopic rod (2733) and the second telescopic rod (2734) to move closer to each other and retract.

11. The baby stroller according to claim 7, characterized in that: The first rotating joint (25) comprises an upper push rod rotating housing (251), a lower push rod rotating housing (252) and an upper locking member (253); The upper push rod rotating shell (251) is connected to the lower end of the upper push rod (21), the lower push rod rotating shell (252) is connected to the upper end of the lower push rod (22), the upper locking member (253) is connected to the unlocking trigger mechanism (27) via an upper steel wire, and the first rotating joint (25) is unlocked when the upper steel wire pulls the upper locking member (253); The first rotating joint (25) further comprises a gear (254), a first gear groove (2511) is provided in the upper push rod rotating housing (251), and a second gear groove (2521) is provided in the lower push rod rotating housing (252). When the first rotating joint (25) is locked, the gear (254) is embedded in the first gear groove (2511) and the second gear groove (2521); When the upper locking member (253) moves upward, the gear (254) disengages from the first gear slot (2511) or the second gear slot (2521), and the first rotation joint (25) is unlocked.

12. The baby stroller according to claim 7, characterized in that: The second rotating joint (26) comprises a lower steel wire (261) and a lower locking piece (262); after the upper push rod (21) rotates, the lower steel wire (261) pulls the lower locking piece (262) to unlock the second rotating joint (26); The second rotating joint (26) comprises a lower push rod rotating member (263), a front bracket rotating member (264) and a rear bracket rotating member (265); The lower push rod rotating member (263) is connected to the lower end of the lower push rod (22), and the lower push rod rotating member (263) is rotatably connected to the front bracket rotating member (264) via a first rotating shaft (266); The front bracket rotating member (264) is connected to the upper end of the front bracket (23), and the front bracket rotating member (264) and the rear bracket rotating member (265) are rotatably connected via a second rotating shaft (267); The rear support rotating member (265) is connected to the upper end of the rear support (24); The lower push rod rotating member (263), the front bracket rotating member (264) and the rear bracket rotating member (265) are all provided with lower locking grooves (268); the lower locking member (262) is inserted into the lower locking grooves (268), and the second rotating joint (26) is locked.

13. A method for folding a baby stroller according to any one of claims 7 to 12, characterized in that: The following steps are involved: Operating the switch unit (14) to unlock the upper rotating joint (19) and the lower rotating joint (13); Flipping the first back portion (11) forward and downward so that the first back portion (11) approaches the second back portion (18); Flipping the second back portion (18) forward and downward so that the second back portion (18) approaches the seat portion (12); Operating an unlocking trigger mechanism (27) to unlock the first rotating joint (25); Flipping the upper push rod (21) backward and downward to approach the lower push rod (22); The second rotating joint (26) is unlocked, the lower push rod (21) is flipped forward and downward, and the lower push rod (21) and the upper push rod (21) are flipped downward together to approach the front bracket (23); The handle hole (1212) on the seat frame assembly (10) is lifted, and the front bracket (23) and the rear bracket (24) are folded together.

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