CN216140041U - Trailer for children - Google Patents

Abstract

The utility model discloses a children trailer which comprises a frame with an unfolded state and a folded state, a front wheel assembly and a rear wheel assembly arranged at the bottom of the frame, and a locking mechanism used for locking the frame in the unfolded state, wherein the frame comprises a front support with the front wheel assembly arranged at the bottom, a rear support with the rear wheel assembly arranged at the bottom, and a support frame which can be folded and arranged between the front support and the rear support along the front-rear direction, the support frame comprises an upper chassis assembly and a lower chassis assembly which are arranged up and down, and a support frame extending along the up-down direction, and when the frame is converted from the unfolded state to the folded state, the support frame moves upwards to enable the support frame to be folded between the front support and the rear support along the front-rear direction. The children trailer has a simple structure, can be folded, occupies small space after being folded, and is convenient to store and transport.

Description

Trailer for children

Technical Field

The utility model relates to a children trailer.

Background

Existing pushchairs are mostly arranged to be foldable in order to reduce the storage space for storage and transport. However, due to the addition of the folding mechanism, the main frame of the baby carriage is often very complex, and in the normal use process of the baby carriage, the fault rate and the operation burden are increased due to the complex frame structure. Thus, it is the direction of endeavor of those skilled in the art to design and manufacture a child car that is foldable and compact in structure.

Disclosure of Invention

The utility model aims to provide a novel children trailer.

In order to achieve the purpose, the utility model adopts the technical scheme that: a children trailer comprises a frame with an unfolding state and a folding state, a front wheel assembly and a rear wheel assembly arranged at the bottom of the frame, and a locking mechanism for locking the frame in the unfolding state, wherein the frame comprises a front support with the front wheel assembly arranged at the bottom, a rear support with the rear wheel assembly arranged at the bottom, and a supporting frame arranged between the front support and the rear support in a folding manner along the front-rear direction, the supporting frame comprises an upper chassis assembly and a lower chassis assembly which are arranged one above the other, and a supporting frame extending along the up-down direction,

the upper chassis assembly comprises a first upper chassis and a second upper chassis which respectively extend along the front-back direction, the front part of the first upper chassis is rotationally connected to the front bracket, the rear part of the second upper chassis is rotationally connected to the rear bracket, two of the rear part of the first upper chassis, the front part of the second upper chassis and the upper part of the support frame are rotationally connected and the third one is rotationally connected to one of the two, or the rear part of the first upper chassis, the front part of the second upper chassis and the upper part of the support frame are rotationally connected around the same rotation center line;

the lower chassis assembly comprises a first lower chassis and a second lower chassis which respectively extend along the front and rear directions, the front part of the first lower chassis is rotationally connected to the front bracket, the rear part of the second lower chassis is rotationally connected to the rear bracket, two of the rear part of the first lower chassis, the front part of the second lower chassis and the lower part of the support frame are rotationally connected, and the third one is rotationally connected to one of the two, or the rear part of the first lower chassis, the front part of the second lower chassis and the lower part of the support frame are rotationally connected around the same rotation center line;

when the frame is converted from the unfolded state to the folded state, the support frame moves upwards to fold the support frame between the front support and the rear support along the front-rear direction.

Preferably, the support frame further includes a front link and a rear link, one end of the front link being rotatably connected to one of the first upper chassis and the first lower chassis, and the other end of the front link being provided on the other of the first upper chassis and the first lower chassis to be relatively rotatable and slidable; one end of the rear link is rotatably connected to one of the second upper chassis and the second lower chassis, and the other end of the rear link is provided to the other of the second upper chassis and the second lower chassis so as to be relatively rotatable and slidable.

Further, a front sliding piece is rotatably arranged on the front connecting frame, and the front sliding piece can be arranged on the first upper chassis or the first lower chassis in a manner of relatively sliding along the length extending direction of the first upper chassis or the first lower chassis; the rear connecting frame is rotatably provided with a rear sliding part, the rear sliding part can be arranged on the second upper chassis or the second lower chassis in a relative sliding manner along the length extending direction of the second upper chassis or the second lower chassis, and the frame moves in the opposite direction when the frame is in a conversion process from an unfolding state to a folding state.

Furthermore, the front sliding piece is rotatably arranged at the lower part of the front connecting frame, the upper part of the front connecting frame is rotatably connected with the front part of the first upper chassis, and the front sliding piece is relatively slidably arranged on the first lower chassis along the length extending direction of the first lower chassis;

the rear sliding piece is rotatably arranged at the lower part of the rear connecting frame, the upper part of the rear connecting frame is rotatably connected to the rear part of the second upper underframe, and the rear sliding piece can be relatively slidably arranged on the second lower underframe along the length extending direction of the second lower underframe.

Furthermore, the first lower chassis comprises a front bottom rod extending along the front-back direction, the second lower chassis comprises a rear bottom rod extending along the front-back direction, the front connecting frame comprises two front connecting rods arranged in parallel, the front sliding piece and the front bottom rod are positioned between the two front connecting rods, the rear connecting frame comprises two rear connecting rods arranged in parallel, and the rear sliding piece and the rear bottom rod are positioned between the two rear connecting rods.

Preferably, the support frame comprises two support rods and a cross rod, the two support rods are respectively arranged on the left side and the right side and extend along the vertical direction, the cross rod is fixedly arranged between the lower portions of the two support rods, the upper portions of the support rods are rotatably connected with the first upper underframe/the second upper underframe, and the cross rod is rotatably connected with the first lower underframe/the second lower underframe.

Furthermore, the locking mechanism comprises a front locking assembly for locking the front sliding piece and a rear locking assembly for locking the rear sliding piece, the supporting frame is also provided with an unlocking operation piece for unlocking the front locking assembly and the rear locking assembly simultaneously,

still further preferably, the unlocking operation member is rotatably disposed on the support frame, the front locking assembly includes a front locking member disposed on the front sliding member in a relatively sliding manner, and a sliding direction of the front locking member is perpendicular to a sliding direction of the front sliding member; the rear locking assembly comprises a rear locking piece which is arranged on the rear sliding piece in a relatively sliding way, the sliding direction of the rear locking piece is vertical to the sliding direction of the rear sliding piece,

the unlocking operation piece with be equipped with between the preceding locking piece and be used for when the unlocking operation piece rotates the gliding preceding linkage subassembly of preceding locking piece, the unlocking operation piece with be equipped with between the back locking piece and be used for when the unlocking operation piece rotates the linkage the gliding back linkage subassembly of back locking piece.

Further, the front linkage assembly comprises a front linkage piece slidably arranged on the first upper chassis/the first lower chassis, a front traction cable fixedly connected between the front linkage piece and the front locking piece, a first elastic piece providing acting force required by the movement of the front linkage piece towards the front locking piece, and a front pull rod arranged between the unlocking operation piece and the front linkage piece, wherein a first arc-shaped groove is formed in the unlocking operation piece, the rotation center line of the first arc-shaped groove deviates from the rotation center line of the unlocking operation piece, one end of the front pull rod is slidably arranged in the first arc-shaped groove, and the other end of the front pull rod is arranged on the front linkage piece;

the rear linkage assembly comprises a rear linkage piece, a rear traction rope, a second elastic piece and a rear pull rod, wherein the rear linkage piece is slidably arranged on the second upper base frame/the second lower base frame, the rear traction rope is fixedly connected between the rear linkage piece and the rear locking piece, the second elastic piece provides acting force required by the movement of the rear linkage piece towards the rear locking piece, the rear pull rod is arranged between the unlocking operation piece and the rear linkage piece, a second arc-shaped groove is formed in the unlocking operation piece, the rotating center line of the second arc-shaped groove deviates from the rotating center line of the unlocking operation piece, one end of the rear pull rod is slidably arranged in the second arc-shaped groove, and the other end of the rear pull rod is arranged on the rear linkage piece.

In a preferred embodiment, the rear portion of the first upper frame, the front portion of the second upper frame, and the upper portion of the support frame are rotatably connected to each other about a first rotation center line, the rear portion of the first lower frame, the front portion of the second lower frame, and the lower portion of the support frame are rotatably connected to each other about a second rotation center line, the first rotation center line and the second rotation center line are parallel to each other, the first rotation center line is located above the second rotation center line, and the support frame is raised and lowered in the vertical direction when the frame is switched between the unfolded state and the folded state.

Due to the application of the technical scheme, compared with the prior art, the utility model has the following advantages: the children trailer has a simple structure, can be folded, occupies small space after being folded, and is convenient to store and transport.

Drawings

FIG. 1 is a schematic side view of a child trailer according to the present invention with the frame in a deployed position;

FIG. 2 is a three-dimensional schematic view of a child trailer according to the present invention with the frame in an expanded position;

FIG. 3 is a schematic structural view of a side door locking mechanism in the child trailer of the present invention;

FIG. 4 is a schematic structural view of a rear locking assembly in the child trailer of the present invention, wherein the rear locking assembly locks the rear slider to the rear bottom bar;

FIG. 5 is a schematic structural view of the rear locking assembly of the child trailer of the present invention, wherein the rear locking assembly unlocks the rear slider and the rear bottom bar;

FIG. 6 is a schematic side view of the frame of the child trailer of the present invention during transition from an expanded position to a collapsed position;

FIG. 7 is a three-dimensional schematic view of a frame of the children's trailer of the present invention during conversion from an unfolded state to a folded state;

FIG. 8 is a side view of the frame of the child trailer of the present invention in a folded position;

FIG. 9 is a three-dimensional schematic view of a child trailer according to the present invention with the frame in a folded position;

wherein: 100. a frame;

1. a front bracket; 11. a front support rod; 12. a front upper cross bar; 12a, a clamping seat; 13. a front lower cross bar;

2. a rear bracket; 21. a rear support rod; 22. a rear upper cross bar; 23. a rear lower cross bar;

3. a support frame; 31. a support bar; 32. a cross bar; 33. an unlocking operation member; 33a, pulling the handle; 33b, a second arc-shaped groove;

4. an upper chassis assembly; 41. a first upper bottom bar; 42. a second upper bottom bar; 42b, a locking portion; 43. a first cross bar; 44. a second cross bar;

5. a lower chassis assembly; 51. a front bottom bar; 52. a rear sill bar; 53. a lock hole;

6. a front connecting frame; 61. a front link; 62. a front slider;

7. a rear connecting frame; 71. a rear connecting rod; 72. a rear slider;

8. a side door; 80a, a door frame body; 80b, a lock base; 80c, an arc-shaped limiting groove I; 80d, an arc-shaped limiting groove II; 81. a locking member; 81a, a columnar rod portion; 81b, a head; 81c and a limiting groove; 82. a first return spring; 83. a limit retainer ring; 84. a limiting member; 84a and a limiting sheet; 84b, an operation head; 84c, a limiting hole; 85. a second return spring;

9. a pull rod;

200. a front wheel assembly; 300. a rear wheel assembly;

400. a locking mechanism; 402. a rear locking assembly; 403. a rear locking member; 404. a rear linkage; 405. a rear traction rope; 406. a second elastic member; 407. a rear pull rod;

a. a first rotational centerline; b. a second centerline of rotation.

Detailed Description

The technical solution of the present invention is further explained with reference to the drawings and the specific embodiments.

The description of the up-down, left-right, front-back, inner-outer, etc. directions herein is defined in terms of the up-down, left-right, front-back, inner-outer, etc. directions as viewed by a child seated on the child trailer.

A children's trailer, as shown in fig. 1 and 2, includes a frame 100 having an unfolded state and a folded state, a front wheel assembly 200 and a rear wheel assembly 300 provided at the bottom of the frame 100, and a locking mechanism 400 for locking the frame 100 in the unfolded state. The vehicle frame 100 includes: a front bracket 1 with a front wheel assembly 200 at the bottom, a rear bracket 2 with a rear wheel assembly 300 at the bottom, and a supporting frame arranged between the front bracket 1 and the rear bracket 2 in a foldable manner.

In the unfolded state, the front bracket 1 includes two front support rods 11 respectively disposed at the left and right sides of the frame 100 and vertically extending in the up-down direction, a front upper cross bar 12 disposed between the upper end portions of the two front support rods 11 and vertically extending in the left-right direction, and a front lower cross bar 13 disposed between the lower end portions of the two front support rods 11 and vertically extending in the left-right direction; the rear frame 2 includes two rear stays 21 respectively disposed on left and right sides of the frame 100 and extending in the vertical direction, a rear upper cross bar 22 disposed between upper ends of the two rear stays 21 and extending in the horizontal direction, and a rear lower cross bar 23 disposed between lower ends of the two rear stays 21 and extending in the horizontal direction.

The supporting frame comprises a supporting frame 3, an upper chassis component 4 and a lower chassis component 5 which are arranged up and down. Specifically, the support frame 3 is located between the front bracket 1 and the rear bracket 2 in the front-rear direction, and extends in the up-down direction in the deployed state. Specifically, the support frame 3 extends in a U shape with an upward opening, and includes two support rods 31 respectively disposed on the left and right sides of the frame 100 and extending in the up-down direction, and a cross bar 32 connected between the lower end portions of the two support rods 31 and extending in the left-right direction, where the cross bar 32 is integrally provided with the support rods 31 on both sides.

In the unfolded state, the upper chassis assembly 4 and the lower chassis assembly 5 both extend in the front-rear direction, and the upper chassis assembly 4 is located above the lower chassis assembly 5. The upper chassis assembly 4 includes a first upper chassis and a second upper chassis extending in a front-rear direction, respectively, a front portion of the first upper chassis is rotatably connected to the front bracket 1, a rear portion of the second upper chassis is rotatably connected to the rear bracket 2, two of the rear portion of the first upper chassis, the front portion of the second upper chassis, and an upper portion of the support bracket 3 are rotatably connected to one of the two, or the rear portion of the first upper chassis, the front portion of the second upper chassis, and the upper portion of the support bracket 3 are rotatably connected around the same rotation center line. Specifically, in the present embodiment, the first upper chassis has two first upper bottom rods 41 respectively disposed on the left and right sides of the frame 100 and extending in the front-rear direction, and the second upper chassis has two second upper bottom rods 42 respectively disposed on the left and right sides of the frame 100 and extending in the front-rear direction. On each of the left and right sides of the vehicle frame 100, the front end portion of the first upper bottom link 41 is pivotally connected to the front stay 11, the rear end portion of the second upper bottom link 42 is pivotally connected to the rear stay 21, and the rear end portion of the first upper bottom link 41, the front end portion of the second upper bottom link 42, and the upper end portion of the support link 31 are pivotally connected about the first pivot axis a.

In the unfolded state, the lower chassis assembly 5 includes a first lower chassis and a second lower chassis extending in the front-rear direction, respectively, a front portion of the first lower chassis is rotatably connected to the front bracket 1, a rear portion of the second lower chassis is rotatably connected to the rear bracket 2, two of the rear portion of the first lower chassis, the front portion of the second lower chassis, and the lower portion of the support bracket 3 are rotatably connected and a third one is rotatably connected to one of the two, or the rear portion of the first lower chassis, the front portion of the second lower chassis, and the lower portion of the support bracket 3 are rotatably connected around the same rotation center line. Specifically, in the present embodiment, the first lower chassis includes a front bottom bar 51 extending in the front-rear direction, the second lower chassis includes a rear bottom bar 52 extending in the front-rear direction, a front end portion of the front bottom bar 51 is rotatably connected to a middle position in the left-right direction of the front lower cross bar 13, a rear end portion of the rear bottom bar 52 is rotatably connected to a middle position in the left-right direction of the rear lower cross bar 23, and a rear end portion of the front bottom bar 51, a front end portion of the rear bottom bar 52, and the cross bar 32 are rotatably connected about the second rotation center line b.

The first rotation center line a and the second rotation center line b are parallel to each other, and the first rotation center line a is located above the second rotation center line b.

The support frame further comprises a front attachment frame 6 and a rear attachment frame 7. Specifically, one end of the front link 6 is rotatably connected to one of the first upper chassis and the first lower chassis, and the other end of the front link 6 is provided to the other of the first upper chassis and the first lower chassis so as to be relatively rotatable and slidable. In the present embodiment, the first upper chassis further includes a first cross bar 43 disposed between the two first upper bottom bars 41 and extending in the left-right direction, the first cross bar 43 has two first cross bars disposed in tandem, and the first cross bar 43 located at the front side is disposed between the front end portions of the two first upper bottom bars 41. The front link 6 includes two front links 61 respectively disposed on the left and right sides and disposed in parallel to each other, and in the unfolded state, the two front links 61 extend obliquely downward from front to rear, front end portions of the two front links 61 are respectively rotatably connected to the first cross bar 43 located on the front side, a front slider 62 is rotatably disposed between rear end portions of the two front links 61, and the front slider 62 is slidably disposed on the front bottom bar 51 in the longitudinal direction of the front bottom bar 51. In this embodiment, the front sliding member 62 and the front bottom bar 51 are located between the two front links 61, and the front sliding member 62 is a sliding sleeve slidably sleeved on the front bottom bar 51 along the length direction of the front bottom bar 51.

One end of the rear link 7 is rotatably connected to one of the second upper chassis and the second lower chassis, and the other end of the rear link 7 is provided to the other of the second upper chassis and the second lower chassis so as to be relatively rotatable and slidable. In the present embodiment, the second upper chassis further includes a second cross bar 44 disposed between the two second upper bottom bars 42 and extending in the left-right direction, the second cross bar 44 has two bars disposed in tandem, wherein the second cross bar 44 located at the rear side is disposed between the rear end portions of the two second upper bottom bars 42. The rear link frame 7 includes two rear links 71 that are disposed on the left and right sides and parallel to each other, and in the unfolded state, the two rear links 71 extend obliquely upward from front to rear, rear end portions of the two rear links 71 are rotatably connected to the second cross bar 44 on the rear side, respectively, a rear slider 72 is rotatably disposed between front end portions of the two rear links 71, and the rear slider 72 is slidably disposed on the rear bottom bar 52 in the longitudinal direction of the rear bottom bar 52. In this embodiment, the rear slider 72 and the rear bottom bar 52 are located between the two rear links 71, and the rear slider 72 is a sliding sleeve slidably sleeved on the rear bottom bar 52 along the length direction of the rear bottom bar 52.

The frame 100 further comprises a side door 8, wherein the side door 8 is movably arranged on at least one of the support frame, the front support 1 and the rear support 2, the side door 8 has an open state and a closed state, and when the side door 8 is in the open state, a channel is formed between the front support 1 and the rear support 2 and is positioned above the support frame, so that a child can get on or off a trailer; when side door 8 is in the closed condition, side door 8 is located between front truck 1 and rear frame 2 and is located the left side portion or the right side portion of frame 100 along the fore-and-aft direction, and side door 8 extends and at least part exceeds the braced frame along upper and lower direction to one side formation in the trailer left and right sides direction encloses fender and protection. The side doors 8 are provided with a group, and the side doors 8 are movably arranged on the front bracket 1 or the rear bracket 2; or, there are two groups of side doors 8, one group of side doors 8 is movably arranged on the front bracket 1 and the other group of side doors 8 is movably arranged on the rear bracket 2.

Specifically, in the present embodiment, there are two groups of side doors 8, two groups of side doors 8 form side walls on the side portions of the frame 100 in the closed state, each group of side doors 8 includes a frame-shaped door frame body 80a, wherein the door frame body 80a of one group of side doors 8 is rotatably disposed on the front support rod 11 around the axis of the front support rod 11, the door frame body 80a of the other group of side doors 8 is rotatably disposed on the rear support rod 21 around the axis of the rear support rod 21, and the door frame body 80a is entirely located above the upper chassis assembly 4.

It should be noted that in some other embodiments, the left side portion and the right side portion of the frame 100 should be able to be respectively provided with the side doors 8.

Be equipped with between side door 8 and the braced frame and be used for locking the side door locking mechanical system under the closed condition with side door 8, specifically to in this embodiment, every group side door 8 all is including setting up the lock seat 80b in door frame body 80a bottom, and side door locking mechanical system has two sets of and divides to locate on two sets of lock seats 80b one before the other, and wherein, the side door locking mechanical system who is located the front side is located between side door 8 and first last bottom bar 41 in the up-and-down direction, and the side door locking mechanical system who is located the rear side is located between side door 8 and the second last bottom bar 42 in the up-and-down direction.

Hereinafter, a side door lock mechanism between the side door 8 and the second upper bottom lever 42 will be described as an example.

Referring to fig. 3, the side door locking mechanism includes a locking member 81 provided on the lock base 80b slidably in the vertical direction, a locking portion 42b provided on the second upper bottom bar 42 to be engaged with the locking member 81, the locking member 81 having a first position and a second position on its own sliding path, wherein the first position is located below the second position, the locking member 81 is engaged with the locking portion 42b when the locking member 81 is in the first position so that the side door locking mechanism is in a locked state, and the locking member 81 is disengaged from the locking portion 42b when the locking member 81 is in the second position so that the side door locking mechanism is in an unlocked state.

The side door locking mechanism further comprises a first return spring 82 for providing acting force required by the locking piece 81 to move from the first position to the second position, specifically, the locking piece 81 comprises a columnar rod part 81a and a head part 81b positioned at the top of the columnar rod part 81a, a limiting retainer 83 is arranged on the peripheral side part of the columnar rod part 81a, and the outer diameter of the limiting retainer 83 is larger than that of the columnar rod part 81 a. The first return spring 82 is sleeved on the columnar rod portion 81a in a sliding fit manner, the upper end portion of the first return spring 82 abuts against the limiting retaining ring 83, the lower end portion of the first return spring 82 abuts against the inner side wall of the bottom of the lock seat 80b, and when the locking member 81 is located at the first position, the first return spring 82 is pressed by the limiting retaining ring 83 to accumulate elastic force for driving the locking member 81 to slide upwards.

The side door locking mechanism further includes a limiting member that limits the locking member 81 in the first position. Specifically, the limiting component includes a limiting member 84, and the limiting member 84 is slidably disposed on the lock seat 80b and has a sliding direction perpendicular to the sliding direction of the locking member 81. Specifically, the limiting member 84 includes a limiting piece 84a and an operating head 84b connected in the length direction, the limiting piece 84a has a limiting hole 84c capable of allowing the cylindrical rod portion 81a to pass through in a sliding manner, and the outer diameter of the limiting hole 84c is smaller than the outer diameter of the limiting retainer 83. A stopper groove 81c is formed in the outer peripheral portion of the columnar rod portion 81a, and the stopper groove 81c is located between the head portion 81b and the stopper collar 83. When the side door locking mechanism is in a locked state, part of the inner wall of the limiting hole 84c is mutually clamped with the limiting groove 81 c; when the side door lock mechanism is in the unlocked state, part of the inner wall of the stopper hole 84c is disengaged from the stopper groove 81c, and the columnar rod portion 81a can slidably pass through the stopper hole 84 c.

The limiting assembly further comprises a second return spring 85 which provides acting force required by the limiting member 84 to move along the sliding direction of the second return spring, specifically, in the embodiment, the second return spring 85 provides elastic force for the limiting member 84 to slide outwards along the sliding direction of the second return spring, when the side door locking mechanism is switched from the unlocking state to the locking state, the head portion 81b is pressed downwards, the locking member 81 slides downwards, the columnar rod portion 81a is gradually inserted into the locking portion 42b in a sliding fit manner, when the columnar rod portion 81a slides to a position where the limiting groove 81c located on the columnar rod portion corresponds to the limiting hole 84c, at the moment, the second return spring 85 drives the limiting member 84 to slide outwards, a part of the inner wall of the limiting hole 84c located on the inner side is mutually clamped with the limiting groove 81c, and the side door locking mechanism is locked; when the side door locking mechanism is switched from a locking state to an unlocking state, the operating head 84b is pressed inwards, so that the inner wall of the limiting hole 84c is disengaged from the limiting groove 81c, the first return spring 82 releases elastic force to drive the locking piece 81 to slide upwards, the columnar rod part 81a is disengaged from the locking part 42b, and the side door locking mechanism is unlocked.

A front limiting structure for limiting the range of the rotation angle of the side door 8 is further arranged between the front support rod 11 and the side door 8, as shown in fig. 1 and fig. 2, specifically, the front limiting structure is arranged at the rotation connection position between the door frame body 80a and the front support rod 11, and comprises a first arc-shaped limiting groove 80c which is arranged on the door frame body 80a and extends along the circumferential direction of the front support rod 11, and a front limiting pin (not shown in the figure) which is inserted in the first arc-shaped limiting groove 80c in a sliding fit manner and is fixedly connected with the front support rod 11. A rear limiting structure for limiting the range of the rotation angle of the side door 8 is further arranged between the rear support rod 21 and the side door 8, specifically, the rear limiting structure is arranged at the rotary connection position between the door frame body 80a and the rear support rod 21, the rear limiting structure comprises a second arc-shaped limiting groove 80d which is arranged on the door frame body 80a and extends along the circumferential direction of the rear support rod 21, and a rear limiting pin (not shown in the figure) which is inserted in the second arc-shaped limiting groove 80d in a sliding fit manner and fixedly connected with the rear support rod 21, because of the arrangement of the first arc-shaped limiting groove 80c and the front limiting pin (not shown in the figure), the front group of side doors 8 have a first limiting position and a second limiting position, when the first limiting position is located, the front group of side doors 8 are in a closed state and cannot rotate inwards any more, when the first limiting position is switched to the second limiting position, the front group of side doors 8 rotate outwards by 90 degrees relative to the axis of the front support rod 11, when the rear side door 8 is in the second limit position, the front side door 8 cannot rotate outwards, similarly, due to the arrangement of the arc-shaped limit groove two 80d and the rear limit pin (not shown in the figure), the rear side door 8 has the first limit position and the second limit position, when the rear side door 8 is in the first limit position, the rear side door 8 is in the closed state and cannot rotate inwards, when the first limit position is converted to the second limit position, the rear side door 8 rotates outwards by 90 degrees relative to the axis of the rear support rod 21, and when the rear side door 8 is in the second limit position, the rear side door 8 cannot rotate outwards, so that the arrangement enables a consumer to lock the side door 8 more conveniently when the first limit position is in the first limit position, and when the second limit position is in the second limit position, the side door 8 cannot rotate randomly, and the situation that children are interfered to enter the trailer.

The frame 100 further comprises a pull rod 9 rotatably arranged at the middle position of the left and right directions of the front lower cross rod 13, and the front upper cross rod 12 is provided with a clamping seat 12a for matching and clamping with the pull rod 9.

The front wheel assemblies 200 have two sets disposed on the left and right sides of the frame 100, the rear wheel assemblies 300 have two sets disposed on the left and right sides of the frame 100, and the two sets of front wheel assemblies 200 are positioned between the two sets of rear wheel assemblies 300 in the left-right direction. In this embodiment, the front wheel assembly 200 is a universal wheel assembly, and the front wheel assembly 200 is disposed at the bottom of the front stay 11 in a universal rotation manner and the rear wheel assembly 300 is disposed at the bottom of the rear stay 21 on each of the left and right sides of the vehicle frame 100.

The locking mechanism 400 includes a front locking assembly for locking the front slide 62 and a rear locking assembly 402 for locking the rear slide 72. The front locking assembly is identical in construction to the rear locking assembly 402 and is disposed in front of and behind one another.

The supporting frame 3 is further provided with an unlocking operation member 33 for simultaneously unlocking the front locking member and the rear locking member 402, and the rear end portion of the front bottom bar 51, the front end portion of the rear bottom bar 52 and the unlocking operation member 33 are rotatably connected around a second rotation center line b, which extends in a collinear manner with the axis of the cross bar 32 itself. The unlock operation member 33 has a pull tab 33a, and in the expanded state, the pull tab 33a is brought into close contact with the front bottom bar 51.

Hereinafter, the locking member 402 will be described in detail as an example.

Referring to fig. 4 and 5, the rear locking assembly 402 includes a rear locking member 403 slidably disposed on the rear slider 72, a sliding direction of the rear locking member 403 is perpendicular to a sliding direction of the rear slider 72, a locking hole 53 is disposed at a bottom of the rear bottom bar 52, and the rear locking member 403 is fittingly inserted into the locking hole 53 when the rear locking assembly 402 is locked.

A rear interlocking unit for interlocking the sliding of the rear locking member 403 when the unlocking operation member 33 rotates is provided between the unlocking operation member 33 and the rear locking member 403. The rear linkage assembly includes a rear linkage member 404 slidably disposed in a rod cavity of the rear ground bar 52 along a length direction of the rear ground bar 52, a rear traction cable 405 fixedly connected between the rear linkage member 404 and the rear locking member 403, a second elastic member 406 providing a force required to move the rear linkage member 404 toward the rear locking member 403, and a rear pull rod 407 disposed between the unlocking manipulating member 33 and the rear linkage member 404. The unlocking operation member 33 is provided with a second arc-shaped groove 33b, and the second arc-shaped groove 33b is an eccentric arc-shaped groove, that is, the rotation center line of the second arc-shaped groove 33b deviates from the rotation center line (second rotation center line b) of the unlocking operation member 33. One end of the rear rod 407 is slidably disposed in the second arc-shaped slot 33b, and the other end of the rear rod 407 is disposed on the rear link 404. When unlocking, the pulling handle 33a is pulled backwards, the unlocking operation member 33 rotates clockwise and upwards around the second rotation center line b, due to the guiding effect of the second arc-shaped groove 33b, the rear pulling rod 407 slides in the second arc-shaped groove 33b, and the rear pulling rod 407 moves forwards from the back to the back relative to the rear bottom rod 52, so that the rear pulling rod 407 pulls the rear linkage 404 to slide forwards along the length direction of the rear bottom rod 52, and is pulled by the rear pulling rope 405, the rear locking piece 403 slides upwards along the sliding direction to be disengaged from the locking hole 53, and the rear locking assembly 402 is unlocked. During the unlocking process, the second elastic member 406 is stretched by the rear rod 407 and accumulates elastic force. When locking, when the rear sliding member 72 slides along the rear bottom bar 52 until the rear locking member 403 corresponds to the locking hole 53, the pulling handle 33a is pulled forward, the unlocking operation member 33 rotates counterclockwise and downward around the second rotation center line b, the second elastic member 406 releases the elastic force, the rear linkage member 404 is driven to slide toward the rear locking member 403, the rear traction cable 405 is released from traction, and the rear locking member 403 is fittingly inserted into the locking hole 53.

The front lock assembly includes a front lock member provided on the front slider 62 so as to be relatively slidable in a direction perpendicular to the sliding direction of the front slider 62. A front interlocking component for interlocking the sliding of the front locking piece when the unlocking operation piece 33 rotates is arranged between the unlocking operation piece 33 and the front locking piece. The front linkage assembly comprises a front linkage piece arranged on the front bottom rod 51 in a sliding mode, a front traction cable fixedly connected between the front linkage piece and the front locking piece, a first elastic piece providing acting force required by the movement of the front linkage piece towards the front locking piece, and a front pull rod arranged between the unlocking operation piece 33 and the front linkage piece, wherein a first arc-shaped groove is formed in the unlocking operation piece 33, the rotating center line of the first arc-shaped groove deviates from the rotating center line of the unlocking operation piece 33, namely, the second rotating center line b, one end of the front pull rod is arranged in the first arc-shaped groove in a sliding mode, and the other end of the front pull rod is arranged on the front linkage piece.

When the vehicle body frame 100 is in the unfolded state, as shown in fig. 1 and 2, the front bracket 1 and the rear bracket 2 both extend in the up-down direction, the support frame provided between the front bracket 1 and the rear bracket 2 extends in the front-back direction, the door frames 80a of the two groups of side doors 8 can relatively rotate around the front support bar 11 and the rear support bar 21, respectively, and when in the closed state, the door frames 80a of the two groups of side doors 8 form side walls on the side portions of the vehicle body frame 100. The front wheel assembly 200 and the rear wheel assembly 300 are supported on the ground, and the pull rod 9 is pulled forward, so that the children's trailer can be dragged to run.

When the frame 100 is switched from the unfolded state to the folded state, as shown in fig. 6 and 7, the operating head 84b is pressed inward, the locking of the two sets of side door locking mechanisms is released, the door frame bodies 80a of the two sets of side doors 8 are pushed inward respectively, so that the door frame body 80a of one set of side doors 8 rotates inward around the axial line of the front support rod 11 and is folded between the two front support rods 11 in a left-right manner, and the door frame body 80a of the other set of side doors 8 rotates inward around the axial line of the rear support rod 21 and is folded between the two rear support rods 21 in a left-right manner; the pull rod 9 is pushed backwards, the pull rod 9 rotates backwards around the rotating connection part between the pull rod and the front lower cross rod 13, and the pull rod is clamped on the clamping seat 12a in a matching mode.

Thereafter, pull handle 33a is pulled rearward so that the front and rear locking assemblies 402 are unlocked simultaneously. Then, the pull handle 33a is pulled upwards, the support frame 3 moves upwards, the front bottom rod 51 and the rear bottom rod 52 are gradually and relatively folded around the second rotation center line b in the front-rear direction, the front sliding piece 62 is gradually and backwards slid along the length direction of the front bottom rod 51, and the rear sliding piece 72 is gradually and forwards slid along the length direction of the rear bottom rod 52; simultaneously, on each of the left and right sides of the frame 100, the first and second upper bottom bars 41 and 42 are gradually relatively drawn in the front-rear direction about the first rotation center line a, the front support bar 11 and the rear support bar 21 are gradually relatively drawn in the front-rear direction, and accordingly, the front and rear wheel assemblies 200 and 300 are gradually relatively drawn in the front-rear direction.

When the frame 100 is in the folded state, referring to fig. 8 and 9, the two front support rods 11 and the rear support rod 21 on the same side are folded in the front-rear direction, the two first upper bottom rods 41 and the second upper bottom rod 42 on the same side are folded in the front-rear direction, the front bottom rod 51 and the rear bottom rod 52 are folded in the front-rear direction, and the upper chassis assembly 4 and the lower chassis assembly 5 are folded between the front bracket 1 and the rear bracket 2. The front wheel assemblies 200 and the rear wheel assemblies 300 are relatively folded in the front-rear direction, and the two sets of front wheel assemblies 200 are folded between the two sets of rear wheel assemblies 300 in the left-right direction.

In conclusion, the child trailer disclosed by the utility model is simple in structure, can be folded, occupies a small space after being folded, and is convenient to store and transport.

The above embodiments are merely illustrative of the technical ideas and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.

Claims (10)

1. The utility model provides a children's trailer, includes the frame that has expansion state and fold condition, locates the front wheel subassembly and the rear wheel subassembly of frame bottom, and be used for with the locking mechanical system of frame locking under the expansion state, its characterized in that: the frame comprises a front bracket, a rear bracket and a supporting frame, wherein the front bracket is provided with the front wheel assembly at the bottom, the rear bracket is provided with the rear wheel assembly at the bottom, the supporting frame can be arranged between the front bracket and the rear bracket in a folding way along the front-rear direction, the supporting frame comprises an upper underframe assembly and a lower underframe assembly which are arranged up and down, and the supporting frame extends along the up-down direction,

the upper chassis assembly comprises a first upper chassis and a second upper chassis which respectively extend along the front-back direction, the front part of the first upper chassis is rotationally connected to the front bracket, the rear part of the second upper chassis is rotationally connected to the rear bracket, two of the rear part of the first upper chassis, the front part of the second upper chassis and the upper part of the support frame are rotationally connected and the third one is rotationally connected to one of the two, or the rear part of the first upper chassis, the front part of the second upper chassis and the upper part of the support frame are rotationally connected around the same rotation center line;

the lower chassis assembly comprises a first lower chassis and a second lower chassis which respectively extend along the front and rear directions, the front part of the first lower chassis is rotationally connected to the front bracket, the rear part of the second lower chassis is rotationally connected to the rear bracket, two of the rear part of the first lower chassis, the front part of the second lower chassis and the lower part of the support frame are rotationally connected, and the third one is rotationally connected to one of the two, or the rear part of the first lower chassis, the front part of the second lower chassis and the lower part of the support frame are rotationally connected around the same rotation center line;

when the frame is converted from the unfolded state to the folded state, the support frame moves upwards to fold the support frame between the front support and the rear support along the front-rear direction.

2. The children's trailer of claim 1, wherein: the support frame further comprises a front connecting frame and a rear connecting frame, one end part of the front connecting frame is rotatably connected to one of the first upper chassis and the first lower chassis, and the other end part of the front connecting frame can be relatively rotatably and slidably arranged on the other of the first upper chassis and the first lower chassis; one end of the rear link is rotatably connected to one of the second upper chassis and the second lower chassis, and the other end of the rear link is provided to the other of the second upper chassis and the second lower chassis so as to be relatively rotatable and slidable.

3. The children's trailer of claim 2, wherein: the front connecting frame is rotatably provided with a front sliding piece, and the front sliding piece can be arranged on the first upper chassis or the first lower chassis in a relatively sliding manner along the length extending direction of the first upper chassis or the first lower chassis; the rear connecting frame is rotatably provided with a rear sliding part, the rear sliding part can be arranged on the second upper chassis or the second lower chassis in a relative sliding manner along the length extending direction of the second upper chassis or the second lower chassis, and the frame moves in the opposite direction when the frame is in a conversion process from an unfolding state to a folding state.

4. The children's trailer of claim 3, wherein: the front sliding piece is rotatably arranged at the lower part of the front connecting frame, the upper part of the front connecting frame is rotatably connected with the front part of the first upper chassis, and the front sliding piece can be relatively slidably arranged on the first lower chassis along the length extending direction of the first lower chassis;

the rear sliding piece is rotatably arranged at the lower part of the rear connecting frame, the upper part of the rear connecting frame is rotatably connected to the rear part of the second upper underframe, and the rear sliding piece can be relatively slidably arranged on the second lower underframe along the length extending direction of the second lower underframe.

5. The children's trailer of claim 4, wherein: the first lower bottom frame comprises a front bottom rod extending in the front-back direction, the second lower bottom frame comprises a rear bottom rod extending in the front-back direction, the front connecting frame comprises two front connecting rods arranged in parallel, the front sliding piece and the front bottom rod are located between the two front connecting rods, the rear connecting frame comprises two rear connecting rods arranged in parallel, and the rear sliding piece and the rear bottom rod are located between the two rear connecting rods.

6. The children's trailer of claim 4, wherein: the support frame comprises two support rods and a cross rod, the two support rods are respectively arranged on the left side and the right side and extend along the vertical direction, the cross rod is fixedly arranged between the lower portions of the two support rods, the upper portions of the support rods are rotatably connected with the first upper bottom frame/the second upper bottom frame, and the cross rod is rotatably connected with the first lower bottom frame/the second lower bottom frame.

7. The children's trailer of claim 3, wherein: the locking mechanism comprises a front locking assembly used for locking the front sliding piece and a rear locking assembly used for locking the rear sliding piece, and the supporting frame is further provided with an unlocking operation piece used for unlocking the front locking assembly and the rear locking assembly simultaneously.

8. The children's trailer of claim 7, wherein: the unlocking operation piece is rotatably arranged on the support frame, the front locking assembly comprises a front locking piece which is arranged on the front sliding piece in a relatively sliding manner, and the sliding direction of the front locking piece is perpendicular to that of the front sliding piece; the rear locking assembly comprises a rear locking piece which is arranged on the rear sliding piece in a relatively sliding way, the sliding direction of the rear locking piece is vertical to the sliding direction of the rear sliding piece,

the unlocking operation piece with be equipped with between the preceding locking piece and be used for when the unlocking operation piece rotates the gliding preceding linkage subassembly of preceding locking piece, the unlocking operation piece with be equipped with between the back locking piece and be used for when the unlocking operation piece rotates the linkage the gliding back linkage subassembly of back locking piece.

9. The children's trailer of claim 8, wherein: the front linkage assembly comprises a front linkage piece, a front traction cable, a first elastic piece and a front pull rod, wherein the front linkage piece is arranged on the first upper chassis/the first lower chassis in a sliding manner, the front traction cable is fixedly connected between the front linkage piece and the front locking piece, the first elastic piece provides acting force required by the movement of the front linkage piece towards the front locking piece, the front pull rod is arranged between the unlocking operation piece and the front linkage piece, a first arc-shaped groove is formed in the unlocking operation piece, the rotating central line of the first arc-shaped groove deviates from the rotating central line of the unlocking operation piece, one end of the front pull rod is arranged in the first arc-shaped groove in a sliding manner, and the other end of the front pull rod is arranged on the front linkage piece;

the rear linkage assembly comprises a rear linkage piece, a rear traction rope, a second elastic piece and a rear pull rod, wherein the rear linkage piece is slidably arranged on the second upper base frame/the second lower base frame, the rear traction rope is fixedly connected between the rear linkage piece and the rear locking piece, the second elastic piece provides acting force required by the movement of the rear linkage piece towards the rear locking piece, the rear pull rod is arranged between the unlocking operation piece and the rear linkage piece, a second arc-shaped groove is formed in the unlocking operation piece, the rotating center line of the second arc-shaped groove deviates from the rotating center line of the unlocking operation piece, one end of the rear pull rod is slidably arranged in the second arc-shaped groove, and the other end of the rear pull rod is arranged on the rear linkage piece.

10. The children's trailer according to any one of claims 1 to 9, wherein: the rear portion of first last chassis, the anterior portion of chassis and the upper portion of support frame are connected around first rotation central line rotatoryly, the rear portion of first chassis, the anterior portion of chassis under the second and the lower part of support frame are connected around second rotation central line rotatoryly, first rotation central line with second rotation central line is parallel to each other, just first rotation central line is located the top of second rotation central line, the frame is in the expansion state with the in-process of conversion between the fold condition, the support frame goes up and down along vertical direction.

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