CN212921663U - Frame structure of baby carriage - Google Patents

Abstract

The utility model discloses a children's handcart frame structure, including seat group, footing structure includes looks articulated preceding foot group and back foot group, and seat group transmission is installed in footing structural frame structure who has expansion state and fold condition rather than constituteing, including hand (hold), switching-over connecting rod group lower extreme rotates to be connected in footing structural, and switching-over connecting rod group upper end is provided with the switching-over sliding sleeve, the rotatable connection of hand (hold) lower extreme is on seat group, hand (hold) upper portion with switching-over sliding sleeve sliding connection, be provided with the switching-over arm-tie in the hand (hold), be provided with on the switching-over arm-tie with the locking iron sheet of switching-over sliding sleeve. The utility model provides a can convenient realization promote hand (hold) switching-over and carry out preceding, rear wheel and carry out directional wheel and universal wheel automatic transformation, make things convenient for the folding children's handcart frame structure of unblock.

Description

Frame structure of baby carriage

Technical Field

The utility model relates to a children's handcart frame structure belongs to perambulator technical field.

Background

The baby stroller becomes an indispensable product in the growth process of infants, the baby strollers on the market at present comprise foldable baby stroller frames and are connected with reversible handles, but the handle reversing structures are complex, front wheels and rear wheels cannot be switched between universal wheels and directional wheels, the reversing of the baby stroller is inconvenient to push, and in addition, before the folding process, the baby stroller needs to be unlocked in multiple places respectively, and the baby stroller is inconvenient to operate.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem that a children's handcart frame structure is provided, its simple structure, the hand (hold) completion switching-over that can convenient realization promoted can solve the not enough of prior art.

The technical scheme of the utility model is that: the utility model provides a children's handcart frame structure, includes seat group, footing structure, and the footing structure includes looks articulated preceding foot group and back foot group, and seat group transmission is installed in footing structure and is constituteed the frame construction who has expansion state and fold condition rather than, including hand (hold), switching-over connecting rod group lower extreme rotates to be connected in footing structure, and switching-over connecting rod group upper end is provided with the switching-over sliding sleeve, the rotatable connection of hand (hold) lower extreme is on seat group, hand (hold) upper portion with switching-over sliding sleeve sliding connection, be provided with the switching-over kingpin in the hand (hold), be provided with on the switching-over kingpin with the locking iron. The front foot group and the rear foot group rotate relatively 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 locking iron sheet to stretch and fix and unlock the reversing sliding sleeve, after the locking iron sheet and the reversing sliding sleeve are unlocked, the handle can rotate around the lower end and turn over to the other direction, in the process of turning over the handle, the reversing connecting rod group rotates and the reversing sliding sleeve slides along the handle, after the turning over 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 locking iron sheet to stretch out and fix the reversing sliding sleeve, so that the.

Further comprises a linkage group, one end of the seat group is connected with the front leg group in an adapter way, the other end is fixedly provided with a seat component, one end of the linkage group is connected with the rear foot group in a switching way, the other end of the linkage group is provided with a middle sleeve piece, one side of the middle sleeve piece is connected with a lower sliding sleeve, the other side of the middle sleeve piece is connected with the seat component, the seat component and the lower sliding sleeve are respectively connected with the middle component in a rotating way, a rotating shaft and a first elastic element are arranged in the seat component, the rotating shaft is sleeved with a locking tooth and an ejection tooth which are connected, the locking tooth is elastically connected with a first elastic element, the inner surface of the middle sleeve is provided with a first inner meshing wheel matched with the locking tooth, the inner surface of the seat component is provided with a second inner meshing wheel matched with the locking tooth, the hand (hold) passes down the sliding sleeve rather than sliding connection, and sliding connection has hand (hold) unblock pull pin in the hand (hold), the ejecting tooth removes along the pivot and can pass hand (hold) lateral wall and hand (hold) unblock pull pin cooperation locking. When the frame is unfolded, the first elastic element is in a release state to push the locking teeth and the ejection teeth to move outwards along the rotating shaft, the ejection teeth penetrate through the side wall of the handle to be locked with the handle unlocking pull pin, the lower sliding sleeve, the handle and the handle unlocking pull pin are in a locking state, the locking teeth are meshed with the first inner meshing wheel and the second inner meshing wheel, the middle sleeve piece is fixed with the seat assembly, the seat assembly is locked with the linkage assembly, the lower sliding sleeve is rotatably connected to the rotating shaft through the ejection teeth, and the handle can rotate through the lower sliding sleeve. When the folding bicycle is folded, the handle is pulled to unlock the pull pin, the ejecting tooth and the locking tooth move inwards to press the first elastic element to be in a compressed state, the ejecting tooth and the handle are separated to be unlocked, and the handle can slide along the lower sliding sleeve; the locking tooth is separated from the first inner meshing wheel and is only meshed with the second inner meshing wheel, the middle suite and the seat assembly can rotate relatively, and the seat assembly, the linkage assembly, the front foot assembly and the rear foot assembly form a four-bar mechanism, so that the seat assembly can be folded.

Further be provided with the transmission steel wire in the hand (hold), transmission steel wire one end and switching-over pull pin connection fit, the other end and hand (hold) unblock pull pin clearance fit. The handle is pulled to unlock the handle and the lower sliding sleeve, the reversing pull pin is driven to control the locking iron sheet to unlock the reversing sliding sleeve due to the action of the transmission steel wire, and the handle can slide downwards, so that the folding operation is facilitated.

The seat back assembly is characterized by further comprising a seat back assembly and a back linkage assembly, wherein the lower end of the seat back assembly is connected with a seat assembly end arranged on the seat assembly, one end of the back linkage assembly is connected to the hinged position of the front leg assembly and the rear leg assembly in a switching mode, and the other end of the back linkage assembly is connected to the seat back assembly in a switching mode. The frame is unfolded, and the back seat group provides a back-rest function.

Further, the front foot group and the rear foot group both comprise hollow foot tubes at two sides, the bottom of each hollow foot tube is provided with a roller component, the roller component comprises a sleeve fixedly sleeved at the bottom of the hollow foot tube, a wheel seat rotationally connected with the sleeve is sleeved on the sleeve, a roller is connected on the wheel seat, a directional pin is arranged in the hollow foot tube, a limit groove and a pin hole which are communicated are arranged in the directional pin, a through pin fixedly connected with the hollow pin tube penetrates through the through pin hole, a second elastic element elastically connected with the through pin is arranged in the limit groove, the directional pin is provided with a bolt, the sleeve and the hollow foot tube are both provided with a slot corresponding to the bolt, the wheel seat is provided with a slot which is matched and spliced with the bolt, and the reversing connecting rod group is respectively provided with steel wires connected with the directional pin in the front foot group hollow foot pipe and the directional pin in the rear foot group hollow foot pipe on the corresponding side. When the handle is positioned 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 in collision compression with the through pin, the directional pin has falling potential energy, the bolt on the directional pin is separated from the clamping groove on the wheel seat, the wheel seat can rotate relative to the sleeve, the roller assembly of the front foot group is in a universal wheel state, 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 release state, the bolt on the directional pin is in insertion connection with the clamping groove on the wheel seat, the wheel seat is locked with the sleeve, and the roller assembly of the rear foot group is in a directional wheel state; when the handle is turned to the direction of the front foot set, the reversing connecting rod set rotates along with the handle, a steel wire connected with a directional pin in a hollow foot tube on the rear foot set is tightened, the directional pin in the hollow foot tube of the rear foot set is lifted, a second elastic element in the directional pin is pressed against a through pin, the directional pin has falling potential energy, a bolt on the directional pin is separated from a clamping groove on a wheel seat, the wheel seat can rotate relative to a sleeve, a roller assembly of the rear foot set is in a universal wheel state, meanwhile, the steel wire connected with the directional pin in the hollow foot tube of the front foot set is loosened, the second elastic element in the directional pin releases to push the directional pin to fall, the bolt on the directional pin enters the clamping groove of the wheel seat after passing through the groove of the hollow foot tube through the sleeve and is in inserted connection and matching, the wheel seat is locked with the sleeve, the roller assembly of the front foot set is in a directional wheel state, the roller assembly of the front foot set and the rear foot set are converted in two states of the, the roller components in the same side direction with the handle are always in a directional wheel state, and the roller components on the other side are in a universal wheel state, so that the cart is convenient to use.

It is further all provided with brake equipment on preceding foot group and the back foot group, brake equipment is including setting up in the brake pedal of preceding foot group and back foot group, preceding foot group and back foot group all overlap on the sleeve pipe of wheel components and be equipped with the brake clamping ring, every be provided with drive component on the wheel seat, be connected with reset spring between drive component and the wheel seat, the last pin that is provided with of drive component all is equipped with the retaining ring on the wheel hub of gyro wheel, and the brake pedal of preceding foot group and back foot group is connected with the brake clamping ring transmission on the wheel components of self both sides respectively, and the brake clamping ring that the brake pedal drove both sides is connected with the cooperation of driving medium component, and the pin of drive component is supported with the retaining ring cooperation on the wheel hub of gyro wheel and is kept off. The brake pedal of preceding foot group and back foot group drives the brake clamping ring on the wheel components of body both sides respectively and pushes down and promotes, the brake clamping ring is in the promotion state during normal condition, when pin on the drive disk spare and the retaining ring of the wheel hub of gyro wheel separated, the gyro wheel can free rotation, the car time, the brake pedal drives the brake clamping ring and pushes down and drives the drive disk spare swing, pin on the drive disk spare supports with the retaining ring on the wheel hub of gyro wheel and keeps off, the brake is accomplished, the brake clamping ring promotes after the brake pedal resets, the drive disk spare resets under reset spring effect, the pin on the drive disk spare is separated with the retaining ring of the wheel hub of gyro wheel.

To sum up, the utility model provides a hand (hold) switching-over that realization that can be convenient promoted and carry out preceding, rear wheel and carry out directional wheel and universal wheel switching conversion, make things convenient for the folding children's handcart frame structure of unblock.

Drawings

Fig. 1 is a schematic structural view of the present invention;

FIG. 2 is an exploded view of the present invention;

FIG. 3 is a schematic view of the connection between the linkage set and the seat set and the handle;

FIG. 4 is a schematic view of the handle release pull pin being connected to the reversing pull pin;

FIG. 5 is a schematic structural view of the roller assembly;

FIG. 6 is a schematic structural diagram of the braking device;

FIG. 7 is a schematic view of a handle reversing operation;

fig. 8 is a schematic view of the folding operation of the present invention.

Shown in the figure: a seat group 1; a front leg group 2; a rear leg group 3; a handle 4; a reversing linkage 5; a reversing sliding sleeve 6; a linkage group 7; a backrest linkage group 8; a seat back group 9; a lower sliding sleeve 10; a reversing pull pin 11; a locking iron piece 12; a handle unlocking pull pin 13; a drive wire 14; a seat assembly 15; a middle kit 16; a rotating shaft 17; a first elastic element 18; a locking tooth 19; the ejection teeth 20; the second internal engagement wheel 21; the first internal-engagement wheel 22; a roller assembly 23; a brake device 24; a hollow leg tube 25; a sleeve 26; a wheel seat 27; a roller 28; an orientation pin 29; a limiting groove 30; a pin-through hole 31; a through pin 32; a plug 33; a card slot 34; a second elastic element 35; a brake pedal 36; a brake collar 37; a transmission member 38; a return spring 39; a stopper lever 40; a retaining ring 41.

Detailed Description

The embodiment of the utility model provides a: as shown in fig. 1 to 2, a stroller frame structure, including a seat assembly 1, a bottom foot structure, the bottom foot structure includes a front foot assembly 2 and a rear foot assembly 3 hinged to each other, the seat assembly 1 is installed on the bottom foot structure in a transmission manner and constitutes a frame structure with an unfolding state and a folding state with the bottom foot structure, including a handle 4, a reversing linkage 5, the lower end of the reversing linkage 5 is rotatably connected to the bottom foot structure, a reversing sliding sleeve 6 is arranged at the upper end of the reversing linkage 5, the lower end of the handle 4 is rotatably connected to the seat assembly, the upper part of the handle 4 is slidably connected with the reversing sliding sleeve 6, a reversing pull pin 11 is arranged in the handle 4, and a locking iron sheet 12 matched and locked with the reversing sliding sleeve 6 is arranged on the reversing. The front leg group 2 and the rear leg group 3 rotate relatively to drive the seat group 1 to move to enable the frame to be in an unfolded state or a folded state, when the frame is in the unfolded state, as shown in fig. 7, the reversing pull pin 11 is operated to control the locking iron sheet 12 to stretch and fix and unlock with the reversing sliding sleeve 6, after the locking iron sheet 12 is unlocked with the reversing sliding sleeve, the handle 4 can rotate around the lower end and turn over to the other direction, in the turning process of the handle 4, the reversing connecting rod group 4 rotates and the reversing sliding sleeve 6 slides along the handle 4, after the turning is completed, the reversing sliding sleeve 6 slides to a position corresponding to the reversing pull pin 11, the reversing pull pin 11 is operated to control the locking iron sheet 12 to stretch out and fix with the reversing sliding sleeve 6, and the reversing.

As shown in fig. 3, the preferred embodiment of the present invention includes a linkage set 7, one end of a seat set 1 is connected to a front leg set 2, the other end is fixedly provided with a seat assembly 15, one end of the linkage set 7 is connected to a rear leg set 3, the other end is provided with a middle sleeve 16, one side of the middle sleeve 16 is connected to a lower sliding sleeve 10, the other side is connected to the seat assembly 15, the seat assembly 15 and the lower sliding sleeve 10 are respectively connected to the middle sleeve 16 in a rotating manner, a rotating shaft 17 and a first elastic element 18 are arranged in the seat assembly 15, the rotating shaft 17 is sleeved with a locking tooth 19 and an ejecting tooth 20, the locking tooth 19 is elastically connected to the first elastic element 18, the inner surface of the middle sleeve 16 is provided with a first inner engaging wheel 22 engaged with the locking tooth 19, the inner surface of the seat assembly 15 is provided with a second inner engaging wheel 21 engaged with the locking tooth 19, a handle 4 penetrates through the, the side wall of the handle 14 is provided with an opening matched with the ejecting tooth 20, and the ejecting tooth 20 can move along the rotating shaft 17 and can pass through the opening on the side wall of the handle 14 to be matched and locked with the handle unlocking pull pin 13. When the bicycle frame is unfolded, the first elastic element 18 is in a release state to push the locking teeth 19 and the ejection teeth 20 to move outwards along the rotating shaft 17, the ejection teeth 20 penetrate through the opening of the side wall of the handle 14 to be locked with the handle unlocking pull pin 13, the lower sliding sleeve 10, the handle 4 and the handle unlocking pull pin 13 are in a locking state, the locking teeth 19 are meshed with the first inner meshing wheel 22 and the second inner meshing wheel 21, the middle sleeve 16 is fixed with the seat assembly 15, so that the seat assembly 1 and the linkage assembly 7 are locked, the lower sliding sleeve 10 is rotatably connected to the rotating shaft 17 through the ejection teeth 20, and the handle 4 can rotate through the lower sliding sleeve 10. When the folding bicycle is folded, the handle unlocking pull pin 13 is pulled, the ejecting tooth 20 and the locking tooth 19 move inwards to press the first elastic element 18 to be in a compressed state, the ejecting tooth 20 and the handle 4 are separated and unlocked, and the handle 4 can slide along the lower sliding sleeve 10; the locking tooth 19 is separated from the first inner meshing wheel 22 and only meshed with the second inner meshing wheel 21, the middle sleeve 16 and the seat component 15 can rotate relatively, and the seat group 1, the linkage group 7, the front foot group 1 and the rear foot group 3 form a four-bar linkage mechanism which can rotate relatively, so that the folding can be carried out.

In the preferred embodiment, as shown in fig. 4, a transmission steel wire 14 is arranged in the handle 4, a groove is arranged in the handle unlocking pull pin 13, one end of the transmission steel wire 14 is connected and matched with the reversing pull pin 11, and the other end of the transmission steel wire is in clearance fit with the handle unlocking pull pin 13 through the groove. The handle 4 can be reversed by operating the reversing pull pin 11 to control the locking iron sheet 12 to stretch out and draw back, so that the locking iron sheet is fixed and unlocked with the reversing sliding sleeve 6, but the handle unlocking pull pin 13 is not acted, the handle 4 is pulled, when the handle unlocking pull pin 13 is pulled to unlock the handle 4 and the lower sliding sleeve 10, the handle unlocking pull pin 13 moves for a distance and then drives the transmission steel wire 14, the reversing pull pin 11 is driven under the action of the transmission steel wire 14 to control the locking iron sheet 12 to be unlocked with the reversing sliding sleeve 6, and the handle 4 can slide downwards, so that the folding operation is convenient.

The preferred seat back group 9, back interlock group 8 that include of this embodiment, seat back group 9 lower extreme and seat group 1 set up seat subassembly 15 end and be connected, wherein seat subassembly 15 also can set firmly on seat back group 9, its effect and connected mode with set firmly on seat group 1 the same, back interlock group 8 one end switching is in preceding foot group 2 and the articulated department of back foot group 3, the other end and seat back group 9 switching. The frame deploys the rear seat back group 9 to provide a back rest function. As shown in fig. 8, the utility model discloses when the frame structure is in the expansion state, seat group 1 and interlock group 7 are in the lock-up state, seat group 1, interlock group 7, preceding foot group 1, back foot group 3 can not rotate relatively, when folding, upwards stimulate hand (hold) unblock brace 13 with hand (hold) 4 and lower sliding sleeve 10 unblock, seat group 1 and interlock group 7 unblock simultaneously, hand (hold) unblock brace 13 drives transmission steel wire 14 after removing a section distance, it controls locking iron sheet 12 and the unblock of switching-over brace 6 to drive switching-over brace 11 under transmission steel wire 14's effect, hand (hold) 4 gliding, seat group 1, interlock group 7, preceding foot group 1, back foot group 3 rotates relatively and folds, back interlock group 8 rotates with seat group 1 simultaneously, accomplish folding.

As shown in fig. 5, which is preferred in this embodiment, each of the front leg assembly 2 and the rear leg assembly 3 includes hollow leg tubes 25 on two sides, a roller assembly 23 is disposed at the bottom of each hollow leg tube 25, each roller assembly 23 includes a sleeve 26 fixedly sleeved at the bottom of the hollow leg tube 25, a wheel base 27 rotatably connected to the sleeve 26 is sleeved on the sleeve 26, a roller 28 is connected to the wheel base 27, a positioning pin 29 is disposed in each hollow leg tube 25, a limiting groove 30 and a through pin hole 31 are disposed in the positioning pin 29 and are communicated with each other, a through pin 32 fixedly connected to the hollow leg tube 25 is disposed in the through pin hole 31, a second elastic element 35 elastically connected to the through pin 32 is disposed in the limiting groove 30, a plug pin 33 is disposed on the positioning pin 29, slots corresponding to the plug 33 are disposed on each of the sleeve 26 and the hollow leg tube 25, a slot 34 engaged with the plug 33 is disposed on the wheel base 27, and a directional pin 29 in the hollow leg tube 25 of the front leg assembly 2 and a hollow leg tube 25 of the rear leg assembly 3 on The orientation pin 29 of (a). When the handle 4 is located in the direction of the rear leg group 2, the reversing link group 5 lifts up the orientation pin 29 in the hollow leg tube 25 of the front leg group 2 through a steel wire, the second elastic element 35 in the orientation pin 29 is in interference compression with the through pin 32, the orientation pin 29 has falling potential energy, the bolt 33 on the orientation pin 29 is separated from the slot 34 on the wheel base 27, the wheel base 27 can rotate relative to the sleeve 26, the roller assembly 23 of the front leg group 2 is in a universal wheel state, the orientation pin 29 in the hollow leg tube 25 of the rear leg group 3 is in a falling state at the moment, the second elastic element 35 in the orientation pin 29 is in a release state, the bolt 33 on the orientation pin 29 is inserted into the slot 34 on the wheel base 27, the wheel base 27 is locked with the sleeve 26, and the roller assembly 23 of the rear leg group 3 is in an orientation wheel state; when the handle 4 is turned over to the direction of the front leg assembly 2, the reversing connecting rod assembly 5 rotates along with the handle 4, the steel wire connected with the orientation pin 29 in the hollow leg tube 25 on the rear leg assembly 3 is tightened, the orientation pin 29 in the hollow leg tube 25 of the rear leg assembly 3 is lifted, the second elastic element 35 in the orientation pin 29 is pressed against the through pin 32, the orientation pin 29 has falling potential energy, the bolt 33 on the orientation pin 29 is separated from the clamping groove 34 on the wheel seat 27, the wheel seat 27 can rotate relative to the sleeve 26, the roller assembly 23 of the rear leg assembly 3 is in a universal wheel state, meanwhile, the steel wire connected with the orientation pin 29 in the hollow leg tube 25 of the front leg assembly 2 is loosened, the second elastic element 18 in the orientation pin 29 is released to push the orientation pin 29 to fall, the bolt 33 on the orientation pin 29 is inserted into the clamping groove 34 of the wheel seat 27 through the sleeve 26 and the hollow leg tube 25 and matched with the clamping groove, the wheel seat 27 is locked with the sleeve 26, the roller components 23 of the front foot group 2 are in a directional wheel state, the reversing is performed through the handle 4, the roller components 23 of the front foot group 2 and the rear foot group 3 are converted in two states of a directional wheel and a universal wheel, the roller components 23 in the same side direction with the handle 4 are always in the directional wheel state, and the roller components 23 on the other side are in the universal wheel state, so that the cart is convenient to use.

As shown in fig. 6, which is preferred in this embodiment, the front leg set 2 and the rear leg set 3 are both provided with a brake device 24, the brake device 24 includes brake pedals 36 provided on the front leg set 2 and the rear leg set 3, the sleeves 26 of the roller assemblies 23 on the front leg set 2 and the rear leg set 3 are both sleeved with brake press rings 37, each wheel seat 27 is provided with a transmission member 38, the transmission member 38 is rotatably connected to the wheel seat 27, a return spring 39 is connected between the two, the transmission member 38 is provided with stop rods 40, the hubs of the rollers 28 are both provided with stop rings 41, the brake pedals 36 of the front leg set 2 and the rear leg set 3 are respectively in transmission connection with the brake press rings 37 on the roller assemblies 23 on both sides of the front leg set 2 and the rear leg set 3, the brake pedals 36 drive the brake press rings 37 on both sides to be in fit with the transmission member 38, and the stop rods 40 of the transmission member. The brake pedal 36 of the front foot set 2 and the brake pedal 36 of the rear foot set 3 respectively drive the brake press rings 37 on the roller assemblies 23 on two sides of the front foot set to be pressed down and lifted, the brake press rings 37 are in a lifting state in a normal state, when the stop lever 40 on the transmission member 38 is separated from the retainer ring 41 of the hub of the roller 28, the roller 28 can rotate freely, the brake pedal 36 is connected with the brake press rings 37 of two brakes through a transmission rod, during braking, the brake pedal 36 presses the brake press rings 37 on two sides through the transmission rod to drive the transmission member 38 to swing, the stop lever 40 on the transmission member 38 is abutted against the retainer ring 41 on the hub of the roller 28, braking is completed, after the brake pedal 36 is reset, the brake press rings 37 are lifted, the transmission member 38 is reset under the action of the reset spring 39, and the stop lever 40 on the transmission.

Claims (6)

1. The utility model provides a children handcart frame structure, includes seat group, footing structure, and the footing structure includes preceding foot group of looks articulated and back foot group, and seat group's transmission is installed in footing structure and is constituteed the frame structure who has expansion state and fold condition rather than, its characterized in that: including hand (hold), switching-over connecting rod group lower extreme rotates to be connected on footing structure, and switching-over connecting rod group upper end is provided with the switching-over sliding sleeve, the rotatable connection of hand (hold) lower extreme is on seat group, hand (hold) upper portion with switching-over sliding sleeve sliding connection, be provided with the switching-over kingpin in the hand (hold), be provided with on the switching-over kingpin with the locking iron sheet of switching-over sliding sleeve cooperation locking.

2. A stroller frame structure according to claim 1, wherein: comprises a linkage group, one end of the seat group is connected with the front foot group in an adapter way, the other end is fixedly provided with a seat component, one end of the linkage group is connected with the rear foot group in a switching way, the other end of the linkage group is provided with a middle sleeve piece, one side of the middle sleeve piece is connected with a lower sliding sleeve, the other side of the middle sleeve piece is connected with the seat component, the seat component and the lower sliding sleeve are respectively connected with the middle component in a rotating way, a rotating shaft and a first elastic element are arranged in the seat component, the rotating shaft is sleeved with a locking tooth and an ejection tooth which are connected, the locking tooth is elastically connected with a first elastic element, the inner surface of the middle sleeve is provided with a first inner meshing wheel matched with the locking tooth, the inner surface of the seat component is provided with a second inner meshing wheel matched with the locking tooth, the hand (hold) passes down the sliding sleeve rather than sliding connection, and sliding connection has hand (hold) unblock pull pin in the hand (hold), the ejecting tooth removes along the pivot and can pass hand (hold) lateral wall and hand (hold) unblock pull pin cooperation locking.

3. A stroller frame structure according to claim 2, wherein: a transmission steel wire is arranged in the handle, one end of the transmission steel wire is connected and matched with the reversing pull pin, and the other end of the transmission steel wire is in clearance fit with the handle unlocking pull pin.

4. A stroller frame structure according to claim 2, wherein: the seat back assembly comprises a seat back assembly and a back linkage assembly, wherein the lower end of the seat back assembly is connected with a seat assembly end arranged on the seat assembly, one end of the back linkage assembly is connected to the hinged position of a front leg assembly and a rear leg assembly in a switching mode, and the other end of the back linkage assembly is connected to the seat back assembly in a switching mode.

5. A stroller frame structure according to any one of claims 1 to 4, wherein: the front foot group and the rear foot group both comprise hollow foot tubes at two sides, the bottom of each hollow foot tube is provided with a roller component, the roller component comprises a sleeve fixedly sleeved at the bottom of the hollow foot tube, a wheel seat rotationally connected with the sleeve is sleeved on the sleeve, a roller is connected on the wheel seat, a directional pin is arranged in the hollow foot tube, a limit groove and a pin hole which are communicated are arranged in the directional pin, a through pin fixedly connected with the hollow pin tube penetrates through the through pin hole, a second elastic element elastically connected with the through pin is arranged in the limit groove, the directional pin is provided with a bolt, the sleeve and the hollow foot tube are both provided with a slot corresponding to the bolt, the wheel seat is provided with a slot which is matched and spliced with the bolt, and the reversing connecting rod group is respectively provided with steel wires connected with the directional pin in the front foot group hollow foot pipe and the directional pin in the rear foot group hollow foot pipe on the corresponding side.

6. A stroller frame structure according to claim 5, wherein: the front foot group and the rear foot group are all provided with brake devices, the brake devices comprise brake pedals arranged on the front foot group and the rear foot group, the front foot group and the rear foot group are respectively provided with a brake compression ring and a brake component on a sleeve of each roller component, the wheel seat is provided with a transmission component, a reset spring is connected between the transmission component and the wheel seat, a stop lever is arranged on the transmission component, a retainer ring is arranged on a hub of each roller, the brake pedals of the front foot group and the rear foot group are respectively connected with the brake compression rings on the roller components on two sides of each roller component in a transmission way, the brake compression rings on two sides of each brake pedal are driven to be connected with transmission component in a matching way, and the stop lever of each transmission component is abutted against the retainer ring on the hub.

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