A frame structure of a children's stroller

Abstract

The present invention discloses a child stroller frame structure, comprising a seat group and a foot structure, wherein the foot structure comprises a front foot group and a rear foot group which are hinged to each other, the seat group is transmission-mounted on the foot structure to form a frame structure with an unfolded state and a folded state, and comprises a handle and a reversing connecting rod group, wherein the lower end of the reversing connecting rod group is rotatably connected to the foot structure, the upper end of the reversing connecting rod group is provided with a reversing sliding sleeve, the lower end of the handle is rotatably connected to the seat group, the upper part of the handle is slidably connected to the reversing sliding sleeve, a reversing pull pin is provided in the handle, and a locking iron sheet which cooperates with the reversing sliding sleeve to lock is provided on the reversing pull pin. The present invention provides a child stroller frame structure which can conveniently realize the reversal of the handle by pushing, and automatically convert the front and rear wheels into directional wheels and universal wheels, and conveniently unlock and fold.

Description

Technical Field

[0001] The invention relates to a frame structure of a child stroller and belongs to the technical field of baby strollers. Background Art

[0002] Strollers have become an indispensable product in the growth process of infants and young children. Many strollers on the market currently include a foldable stroller frame connected to a reversible handle, but the handle reversing structure is complex, and the front and rear wheels cannot switch between universal wheels and fixed wheels, which is inconvenient for reversing and pushing the stroller. In addition, before the folding process, multiple places need to be unlocked separately, which is inconvenient to operate. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a child stroller frame structure, which has a simple structure and can conveniently achieve direction reversal by a pushing handle, thereby solving the shortcomings of the prior art.

[0004] The technical solution of the present invention is: a frame structure of a child stroller, including a seat group and a base structure, the base structure including a front foot group and a rear foot group that are hinged to each other, the seat group is transmission-mounted on the base structure to form a frame structure with an unfolded state and a folded state, including a handle and a reversing link group, the lower end of the reversing link group is rotatably connected to the base structure, the upper end of the reversing link group is provided with a reversing sleeve, the lower end of the handle is rotatably connected to the seat group, the upper part of the handle is slidably connected to the reversing sleeve, a reversing pull pin is provided in the handle, and a locking iron sheet that cooperates with the reversing sleeve to lock is provided on the reversing pull pin. The front foot group and the rear foot group rotate relative to each other to drive the seat group to move so that the frame is in an unfolded state or a folded state. When the frame is in the unfolded state, the reversing pull pin is operated to control the extension and retraction of the locking iron sheet and the fixation and unlocking of the reversing sliding sleeve. After the locking iron sheet and the reversing sliding sleeve are unlocked, the handle can be rotated around the lower end and folded to the other direction. During the folding process of the handle, the reversing connecting rod group rotates and the reversing sliding sleeve slides along the handle. After the folding is completed, the reversing sliding sleeve slides to the position corresponding to the reversing pull pin, and the reversing pull pin is operated to control the extension of the locking iron sheet and the fixation of the reversing sliding sleeve, thereby realizing the reversal of the handle.

[0005] Further, it includes a linkage group, one end of the seat group is connected to the front foot group, and the other end is fixed with a seat assembly, one end of the linkage group is connected to the rear foot group, and the other end is provided with a middle kit, one side of the middle kit is connected to a lower sleeve, and the other side is connected to the seat assembly, the seat assembly and the lower sleeve are respectively rotatably connected to the middle kit, a rotating shaft and a first elastic element are provided in the seat assembly, the rotating shaft is provided with connected locking teeth and ejection teeth, the locking teeth are elastically connected to the first elastic element, a first internal gear matched with the locking teeth is provided on the inner surface of the middle kit, and a second internal gear matched with the locking teeth is provided on the inner surface of the seat assembly, the handle passes through the lower sleeve and is slidably connected to it, a handle unlocking pin is slidably connected in the handle, and the ejection tooth moves along the rotating shaft and can pass through the side wall of the handle to cooperate with the handle unlocking pin to lock. When the frame is in the unfolded state, the first elastic element is in the released state, pushing the locking tooth and the ejection tooth to move outward along the rotating shaft, the ejection tooth passes through the side wall of the handle and locks with the handle unlocking pin, the lower sleeve, the handle, and the handle unlocking pin are in the locked state, the locking tooth is meshed with the first inner gear and the second inner gear, the middle sleeve is fixed to the seat assembly, so that the seat assembly is locked with the linkage assembly, the lower sleeve is connected to the rotating shaft through the ejection tooth, and the handle can be rotated through the lower sleeve. When folding, the handle unlocking pin is pulled, the ejection tooth and the locking tooth are pushed inward to press the first elastic element to be in a compressed state, the ejection tooth is separated from the handle and unlocked, and the handle can slide along the lower sleeve; the locking tooth is separated from the first inner gear and only meshed with the second inner gear, the middle sleeve and the seat assembly can rotate relatively, the seat assembly, the linkage assembly, the front foot assembly, and the rear foot assembly form a four-bar linkage mechanism, and folding can be performed.

[0006] Furthermore, a transmission steel wire is arranged in the handle, one end of which is connected and matched with the reversing pull pin, and the other end is in clearance with the handle unlocking pull pin. The reversing pull pin is operated to control the extension and contraction of the locking iron sheet to achieve fixation and unlocking with the reversing sliding sleeve, but does not act on the handle unlocking pull pin, so that the reversing of the handle can be completed. When the handle unlocking pull pin is pulled to unlock the handle and the sliding sleeve, the reversing pull pin is also driven to unlock the locking iron sheet and the reversing sliding sleeve due to the action of the transmission steel wire, and the handle can slide down, which is convenient for folding operation.

[0007] The backrest linkage group further comprises a seat backrest group and a backrest linkage group, wherein the lower end of the seat backrest group is connected to the seat assembly end of the seat group, one end of the backrest linkage group is transferred to the hinge of the front foot group and the rear foot group, and the other end is transferred to the seat backrest group. After the frame is unfolded, the seat backrest group provides a backrest function.

[0008] Furthermore, the front foot group and the rear foot group both include hollow foot tubes on both sides, and a roller assembly is provided at the bottom of each hollow foot tube, and the roller assembly includes a sleeve fixedly sleeved on the bottom of the hollow foot tube, the sleeve is sleeved with a wheel seat rotatably connected to it, and the wheel seat is connected to the roller, a directional pin is provided in the hollow foot tube, and a communicating limiting groove and a pin hole are provided in the directional pin, a pin fixedly connected to the hollow foot tube is provided in the pin hole, a second elastic element elastically connected to the pin is provided in the limiting groove, a latch is provided on the directional pin, and slots corresponding to the latch are provided on the sleeve and the hollow foot tube, and a card slot cooperating with the latch is provided on the wheel seat, and steel wires connected to the directional pins in the hollow foot tube of the front foot group and the directional pins in the hollow foot tube of the rear foot group on the corresponding sides are respectively provided on the reversing connecting rod group. When the handle is located in the direction of the rear foot group, the reversing connecting rod group lifts the directional pin in the hollow foot tube of the front foot group through the steel wire, the second elastic element in the directional pin is compressed against the through pin, the directional pin has the potential energy of falling, the latch on the directional pin and the slot on the wheel seat are in a separated state, the wheel seat can rotate relative to the sleeve, the roller assembly of the front foot group is in a universal wheel state, at this time the directional pin in the hollow foot tube of the rear foot group is in a falling state, the second elastic element in the directional pin is in a released state, the latch on the directional pin is plugged into the slot on the wheel seat, the wheel seat and the sleeve are locked, and the roller assembly of the rear foot group is in a directional wheel state; in the process of folding the handle to the direction of the front foot group, the reversing connecting rod group rotates with the handle, the steel wire connected to the directional pin in the hollow foot tube of the rear foot group is tightened, and the directional pin in the hollow foot tube of the rear foot group is lifted The second elastic element in the directional pin is compressed by the through pin, and the directional pin has the potential energy of falling. The pin on the directional pin is separated from the slot on the wheel seat, and the wheel seat can rotate relative to the sleeve. The roller assembly of the rear foot group is in the universal wheel state. At the same time, the steel wire connected to the directional pin in the hollow foot tube of the front foot group is loosened, and the second elastic element in the directional pin is released to push the directional pin to fall. The pin on the directional pin enters the slot of the wheel seat through the slot of the sleeve and the hollow foot tube for plug-in cooperation. The wheel seat and the sleeve are locked, and the roller assembly of the front foot group is in the fixed wheel state. By reversing the handle, the roller assemblies of the front foot group and the rear foot group are transformed between the fixed wheel and the universal wheel states. The roller assembly on the same side of the handle is always in the fixed wheel state, and the roller assembly on the other side is in the universal wheel state, which is convenient for the use of the cart.

[0009] Furthermore, the front foot group and the rear foot group are both provided with a brake device, and the brake device includes a brake pedal arranged on the front foot group and the rear foot group, and a brake pressure ring is sleeved on the sleeve of the roller assembly on the front foot group and the rear foot group, and a transmission component is arranged on each of the wheel seats, a return spring is connected between the transmission component and the wheel seat, a baffle rod is arranged on the transmission component, and a baffle ring is arranged on the wheel hub of the roller, and the brake pedals of the front foot group and the rear foot group are respectively connected to the brake pressure rings on the roller assemblies on both sides thereof, and the brake pedal drives the brake pressure rings on both sides to cooperate with the transmission component, and the baffle rod of the transmission component cooperates with the baffle ring on the wheel hub of the roller to resist. The brake pedals of the front foot group and the rear foot group respectively drive the brake pressure rings on the roller assemblies on both sides of the body to be pressed down and lifted. In normal state, the brake pressure ring is in a lifted state, and when the stop rod on the transmission component is separated from the stop ring of the roller hub, the roller can rotate freely. When driving, the brake pedal drives the brake pressure ring to be pressed down to drive the transmission component to swing, and the stop rod on the transmission component resists the stop ring on the roller hub. After braking, the brake pedal is reset to lift the brake pressure ring, and the transmission component is reset under the action of the reset spring, and the stop rod on the transmission component is separated from the stop ring of the roller hub.

[0010] In summary, the present invention provides a child stroller frame structure that can conveniently realize the reversal of the pushing handle and the switching and conversion between fixed wheels and universal wheels of the front and rear wheels, and can be conveniently unlocked and folded. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a structural schematic diagram of the present invention;

[0012] Figure 2 An exploded view of the present invention;

[0013] Figure 3 It is a schematic diagram of the connection between the linkage group, the seat group and the handlebar;

[0014] Figure 4 It is a schematic diagram of the connection between the handle unlocking pull pin and the reversing pull pin;

[0015] Figure 5 is a structural schematic diagram of a roller assembly;

[0016] Figure 6 is a schematic diagram of the structure of the brake device;

[0017] Figure 7 This is a schematic diagram of the handlebar reversing operation;

[0018] Figure 8 It is a schematic diagram of the folding operation of the present invention.

[0019] As shown in the figure: seat group 1; front foot group 2; rear foot group 3; handlebar 4; reversing connecting rod group 5; reversing sliding sleeve 6; linkage group 7; backrest linkage group 8; seat back group 9; lower sliding sleeve 10; reversing pull pin 11; locking iron sheet 12; handle unlocking pull pin 13; transmission wire 14; seat assembly 15; middle kit 16; rotating shaft 17; first elastic element 18; locking tooth 19; ejector tooth 20; second internal gear 21; first internal gear 22; roller assembly 23; brake device 24; hollow foot tube 25; sleeve 26; wheel seat 27; roller 28; directional pin 29; limiting groove 30; pin hole 31; pin 32; pin 33; slot 34; second elastic element 35; brake pedal 36; brake pressure ring 37; transmission member 38; return spring 39; stop rod 40; retaining ring 41. DETAILED DESCRIPTION

[0020] Embodiments of the present invention: Figure 1 to Figure 2 As shown, a frame structure of a child stroller includes a seat group 1 and a foot structure. The foot structure includes a front foot group 2 and a rear foot group 3 which are hinged to each other. The seat group 1 is driven and installed on the foot structure to form a frame structure with an expanded state and a folded state, including a handle 4 and a reversing link group 5. The lower end of the reversing link group 5 is rotatably connected to the foot structure. The upper end of the reversing link group 5 is provided with a reversing sleeve 6. The lower end of the handle 4 is rotatably connected to the seat group. The upper part of the handle 4 is slidably connected to the reversing sleeve 6. A reversing pull pin 11 is provided in the handle 4. The reversing pull pin 11 is provided with a locking iron sheet 12 which cooperates with the reversing sleeve 6 to lock. The front foot group 2 and the rear foot group 3 rotate relative to each other to drive the seat group 1 to move so that the frame is in an expanded state or a folded state. When the frame is in the expanded state, such as Figure 7 As shown, the reversing pin 11 is operated to control the extension and retraction of the locking iron sheet 12 and the fixation and unlocking of the reversing sleeve 6. After the locking iron sheet 12 and the reversing sleeve are unlocked, the handle 4 can be rotated around the lower end and folded to the other direction. During the folding process of the handle 4, the reversing connecting rod group 4 rotates and the reversing sleeve 6 slides along the handle 4. After the folding is completed, the reversing sleeve 6 slides to the position corresponding to the reversing pin 11. The reversing pin 11 is operated to control the locking iron sheet 12 to extend and fix it with the reversing sleeve 6, thereby realizing the reversal of the handle 4.

[0021] This embodiment gives priority to Figure 3As shown, it includes a linkage group 7, one end of the seat group 1 is connected to the front foot group 2, and the other end is fixed with a seat assembly 15, one end of the linkage group 7 is connected to the rear foot group 3, and the other end is provided with a middle set 16, one side of the middle set 16 is connected to the lower sleeve 10, and the other side is connected to the seat assembly 15, the seat assembly 15 and the lower sleeve 10 are respectively rotatably connected to the middle set 16, and the seat assembly 15 is provided with a rotating shaft 17 and a first elastic element 18, and the rotating shaft 17 is provided with a connected locking tooth 19 and an ejection tooth 20, and the locking tooth 1 9 is elastically connected to the first elastic element 18, the inner surface of the middle set 16 is provided with a first internal gear 22 that cooperates with the locking tooth 19, the inner surface of the seat assembly 15 is provided with a second internal gear 21 that cooperates with the locking tooth 19, the handle 4 passes through the lower sliding sleeve 10 and is slidably connected thereto, a handle unlocking pull pin 13 is slidably connected inside the handle 4, an opening that cooperates with the ejection tooth 20 is provided on the side wall of the handle 14, and the ejection tooth 20 moves along the rotating shaft 17 and can pass through the opening on the side wall of the handle 14 to cooperate with the handle unlocking pull pin 13 and lock. When the frame is in the unfolded state, the first elastic element 18 is in the released state, pushing the locking tooth 19 and the ejecting tooth 20 to move outward along the rotating shaft 17. The ejecting tooth 20 passes through the opening on the side wall of the handle 14 and is locked with the handle unlocking pin 13. The lower sleeve 10, the handle 4, and the handle unlocking pin 13 are in the locked state. The locking tooth 19 is engaged with the first internal gear 22 and the second internal gear 21. The middle sleeve 16 is fixed to the seat assembly 15, so that the seat group 1 and the linkage group 7 are locked. The lower sleeve 10 is rotatably connected to the rotating shaft 17 through the ejecting tooth 20, and the handle 4 can be rotated through the lower sleeve 10. When folding, the handle is pulled to unlock the pull pin 13, and the ejector tooth 20 and the locking tooth 19 are pushed inward to press the first elastic element 18 to compress it, so that the ejector tooth 20 is separated from the handle 4 and unlocked, and the handle 4 can slide along the lower slide sleeve 10; the locking tooth 19 is separated from the first internal gear 22 and only engages with the second internal gear 21, the middle kit 16 and the seat assembly 15 can rotate relative to each other, and the seat group 1, the linkage group 7, the front leg group 1, and the rear leg group 3 form a four-bar linkage mechanism that can rotate relative to each other, and folding can be performed.

[0022] This embodiment gives priority to Figure 4 As shown, a transmission wire 14 is provided in the handle 4, and a groove is provided in the handle unlocking pin 13. One end of the transmission wire 14 is connected and matched with the reversing pin 11, and the other end is gap-matched with the handle unlocking pin 13 through the groove. The reversing pin 11 is operated to control the extension and contraction of the locking iron sheet 12 to achieve fixation and unlocking with the reversing sliding sleeve 6, but it does not act on the handle unlocking pin 13, so that the reversing of the handle 4 can be completed. When the handle unlocking pin 13 is pulled to unlock the handle 4 from the sliding sleeve 10, the handle unlocking pin 13 moves a distance and then drives the transmission wire 14. Under the action of the transmission wire 14, the reversing pin 11 is driven to control the locking iron sheet 12 to unlock the reversing sliding sleeve 6, and the handle 4 can slide down, which is convenient for folding operation.

[0023] The preferred embodiment includes a seat back group 9 and a back linkage group 8. The lower end of the seat back group 9 is connected to the end of the seat assembly 15 provided on the seat group 1. The seat assembly 15 can also be fixed on the seat back group 9. Its function and connection method are the same as those fixed on the seat group 1. One end of the back linkage group 8 is transferred to the hinge of the front foot group 2 and the rear foot group 3, and the other end is transferred to the seat back group 9. After the frame is unfolded, the seat back group 9 provides a backrest function. Figure 8 As shown, when the frame structure of the present invention is in the unfolded state, the seat group 1 and the linkage group 7 are in the locked state, and the seat group 1, the linkage group 7, the front leg group 1, and the rear leg group 3 cannot rotate relative to each other. When folding, the handle unlocking pin 13 is pulled upward to unlock the handle 4 and the sliding sleeve 10, and the seat group 1 and the linkage group 7 are unlocked at the same time. The handle unlocking pin 13 moves a certain distance and drives the transmission wire 14. Under the action of the transmission wire 14, the reversing pin 11 is driven to control the locking iron sheet 12 and the reversing sliding sleeve 6 to unlock. The handle 4 slides down, the seat group 1, the linkage group 7, the front leg group 1, and the rear leg group 3 rotate relative to each other to fold, and the backrest linkage group 8 rotates at the same time as the seat group 1 to complete the folding.

[0024] This embodiment gives priority to Figure 5As shown, the front foot group 2 and the rear foot group 3 both include hollow foot tubes 25 on both sides, and a roller assembly 23 is provided at the bottom of each hollow foot tube 25. The roller assembly 23 includes a sleeve 26 fixedly sleeved on the bottom of the hollow foot tube 25, and a wheel seat 27 rotatably connected to the sleeve 26 is sleeved on the sleeve 26, and a roller 28 is connected to the wheel seat 27. A directional pin 29 is provided in the hollow foot tube 25, and a limit groove 30 and a pin hole 31 that are connected to the directional pin 29 are provided in the directional pin 29. A roller 28 is provided in the pin hole 31. 25 is fixedly connected with a through pin 32, a second elastic element 35 elastically connected with the through pin 32 is arranged in the limiting groove 30, a plug pin 33 is arranged on the directional pin 29, a slot corresponding to the plug pin 33 is opened on the sleeve 26 and the hollow leg tube 25, a card slot 34 cooperating with the plug pin 33 is arranged on the wheel seat 27, and steel wires connected with the directional pins 29 in the hollow leg tube 25 of the front leg group 2 and the directional pins 29 in the hollow leg tube 25 of the rear leg group 3 on the corresponding side are respectively arranged on the reversing connecting rod group 5. When the handle 4 is located in the direction of the rear foot group 2, the reversing connecting rod group 5 lifts the directional pin 29 in the hollow foot tube 25 of the front foot group 2 through the steel wire, and the second elastic element 35 in the directional pin 29 is compressed against the through pin 32, and the directional pin 29 has the potential energy of falling. The plug pin 33 on the directional pin 29 and the card slot 34 on the wheel seat 27 are in a separated state, and the wheel seat 27 can rotate relative to the sleeve 26. The roller assembly 23 of the front foot group 2 is in a universal wheel state. At this time, the directional pin 29 in the hollow foot tube 25 of the rear foot group 3 is in a universal wheel state. The pin 29 is in a falling state, the second elastic element 35 in the directional pin 29 is in a released state, the latch pin 33 on the directional pin 29 is plugged into the slot 34 on the wheel seat 27, the wheel seat 27 is locked with the sleeve 26, and the roller group 23 of the rear foot group 3 is in a directional wheel state; when the handle 4 is folded to the direction of the front foot group 2, the reversing connecting rod group 5 rotates with the handle 4, and the steel wire connected to the directional pin 29 in the hollow foot tube 25 on the rear foot group 3 is tightened, so that the directional pin 29 in the hollow foot tube 25 of the rear foot group 3 is retracted. 9 is lifted, the second elastic element 35 in the directional pin 29 is compressed against the through pin 32, the directional pin 29 has the potential energy to fall, the latch pin 33 on the directional pin 29 is separated from the slot 34 on the wheel seat 27, the wheel seat 27 can rotate relative to the sleeve 26, the roller assembly 23 of the rear foot group 3 is in a universal wheel state, at the same time, the steel wire connected to the directional pin 29 in the hollow foot tube 25 of the front foot group 2 is loosened, the second elastic element 18 in the directional pin 29 is released to push the directional pin 29 to fall, and the directional pin 29 The latch pin 33 on the front foot group 2 enters the slot 34 of the wheel seat 27 through the slot of the sleeve 26 and the hollow leg tube 25 for plugging and matching. The wheel seat 27 and the sleeve 26 are locked, and the roller assembly 23 of the front foot group 2 is in the fixed wheel state. By reversing the handle 4, the roller assemblies 23 of the front foot group 2 and the rear foot group 3 are converted between the fixed wheel state and the universal wheel state. The roller assembly 23 on the same side of the handle 4 is always in the fixed wheel state, and the roller assembly 23 on the other side is in the universal wheel state, which is convenient for the use of the cart.

[0025] This embodiment gives priority to Figure 6 As shown, the front foot group 2 and the rear foot group 3 are both provided with a brake device 24, and the brake device 24 includes a brake pedal 36 arranged on the front foot group 2 and the rear foot group 3, and the sleeve 26 of the roller assembly 23 on the front foot group 2 and the rear foot group 3 is sleeved with a brake pressure ring 37, and each wheel seat 27 is provided with a transmission component 38, and the transmission component 38 is rotatably connected to the wheel seat 27, and a return spring 39 is connected therebetween, and a baffle rod 40 is provided on the transmission component 38, and a baffle ring 41 is provided on the wheel hub of the roller 28, and the brake pedals 36 of the front foot group 2 and the rear foot group 3 are respectively connected to the brake pressure rings 37 on the roller assemblies 23 on both sides of themselves, and the brake pedals 36 drive the brake pressure rings 37 on both sides to cooperate with the transmission component 38, and the baffle rod 40 of the transmission component 38 cooperates with the baffle ring 41 on the wheel hub of the roller 28 to resist. The brake pedals 36 of the front foot group 2 and the rear foot group 3 respectively drive the brake pressure rings 37 on the roller assemblies 23 on both sides of themselves to be pressed down and lifted. In the normal state, the brake pressure rings 37 are in the lifted state. When the baffle rod 40 on the transmission component 38 is separated from the baffle ring 41 of the wheel hub of the roller 28, the roller 28 can rotate freely. The brake pedal 36 is connected to the brake pressure rings 37 of the two brakes through the transmission rod. When braking, the brake pedal 36 presses down the brake pressure rings 37 on both sides through the transmission rod to drive the transmission component 38 to swing. The baffle rod 40 on the transmission component 38 resists the baffle ring 41 on the wheel hub of the roller 28. After braking, the brake pedal 36 is reset to lift the brake pressure ring 37. The transmission component 38 is reset under the action of the reset spring 39, and the baffle rod 40 on the transmission component 38 is separated from the baffle ring 41 of the wheel hub of the roller 28.

Claims

1. A child stroller frame structure, comprising a seat group and a foot structure, wherein the foot structure comprises a front foot group and a rear foot group which are hinged to each other, and the seat group is transmission mounted on the foot structure to form a frame structure with an unfolded state and a folded state, characterized in that: It includes a handle and a reversing connecting rod group, the lower end of the reversing connecting rod group is rotatably connected to the base structure, the upper end of the reversing connecting rod group is provided with a reversing sliding sleeve, the lower end of the handle is rotatably connected to the seat group, the upper part of the handle is slidably connected to the reversing sliding sleeve, a reversing pull pin is provided in the handle, and a locking iron sheet that cooperates with the reversing sliding sleeve and locks is provided on the reversing pull pin; it includes a linkage group, one end of the seat group is transferred to the front foot group, and the other end is fixed with a seat assembly, one end of the linkage group is transferred to the rear foot group, and the other end is provided with a middle kit, one side of the middle kit is connected to a lower sleeve, and the other side is connected to the seat assembly, the seat assembly and the lower sleeve are respectively rotatably connected to the middle kit, a rotating shaft and a first elastic element are provided in the seat assembly, and a connecting sleeve is provided on the rotating shaft The locking tooth and the ejection tooth are elastically connected to the first elastic element, the inner surface of the middle kit is provided with a first internal gear matched with the locking tooth, and the inner surface of the seat assembly is provided with a second internal gear matched with the locking tooth. The handle passes through the lower sleeve and is slidably connected with it, and a handle unlocking pull pin is slidably connected in the handle, and the ejection tooth moves along the rotating shaft and can pass through the side wall of the handle to lock with the handle unlocking pull pin; a transmission steel wire is provided in the handle, one end of the transmission steel wire is connected and matched with the reversing pull pin, and the other end is gap-matched with the handle unlocking pull pin; it includes a seat back group and a backrest linkage group, the lower end of the seat back group is connected with the seat assembly end set of the seat group, one end of the backrest linkage group is transferred to the hinge of the front foot group and the rear foot group, and the other end is transferred to the seat back group.

2. The frame structure of the baby stroller according to claim 1, characterized in that: The front foot group and the rear foot group both include hollow foot tubes on both sides, and each of the hollow foot tubes is provided with a roller assembly at the bottom. The roller assembly includes a sleeve fixedly sleeved on the bottom of the hollow foot tube, the sleeve is sleeved with a wheel seat rotatably connected to it, and the wheel seat is connected to the roller. A directional pin is provided in the hollow foot tube, and a communicating limiting groove and a pin-through hole are provided in the directional pin, a pin fixedly connected to the hollow foot tube is provided in the pin-through hole, a second elastic element elastically connected to the pin is provided in the limiting groove, a latch is provided on the directional pin, and slots corresponding to the latch are provided on the sleeve and the hollow foot tube, and a card slot cooperating with the latch is provided on the wheel seat, and steel wires connected to the directional pins in the hollow foot tubes of the front foot group and the hollow foot tubes of the rear foot group on the corresponding sides are respectively provided on the reversing connecting rod group.

3. The frame structure of the baby stroller according to claim 2, characterized in that: The front foot group and the rear foot group are both provided with a brake device, and the brake device includes a brake pedal arranged on the front foot group and the rear foot group, and a brake pressure ring is sleeved on the sleeve of the roller assembly of the front foot group and the rear foot group, and a transmission component is arranged on each of the wheel seats, a return spring is connected between the transmission component and the wheel seat, a baffle rod is arranged on the transmission component, and a baffle ring is arranged on the wheel hub of the roller, and the brake pedals of the front foot group and the rear foot group are respectively connected to the brake pressure rings on the roller assemblies on both sides thereof, and the brake pedal drives the brake pressure rings on both sides to cooperate with the transmission component, and the baffle rod of the transmission component cooperates with the baffle ring on the wheel hub of the roller to resist.

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