CN113879385A

CN113879385A - Children's trailer

Info

Publication number: CN113879385A
Application number: CN202111067371.8A
Authority: CN
Inventors: 李光耀
Original assignee: Goodbaby Child Products Co Ltd
Current assignee: Goodbaby Child Products Co Ltd
Priority date: 2021-09-13
Filing date: 2021-09-13
Publication date: 2022-01-04

Abstract

The invention discloses a children trailer which comprises a trailer frame in an unfolded state and a folded state, and a front wheel assembly and a rear wheel assembly which are arranged at the bottom of the trailer frame, wherein the trailer frame comprises a front support, a rear support, an upper chassis assembly and a lower chassis assembly which are arranged between the front support and the rear support, the front support and the rear support respectively extend along the vertical direction when the trailer frame is in the unfolded state, the front wheel assembly is arranged at the bottom of the front support, the rear wheel assembly is arranged at the bottom of the rear support, the trailer frame is in the folded state, a first upper chassis and a second upper chassis extend along the vertical direction and are folded between the front support and the rear support, and a first lower bottom rod and a second lower bottom rod extend along the horizontal direction and are folded between the front support and the rear support. The children trailer has simple structure, occupies small volume after being folded, and is convenient to store and transport.

Description

Children's trailer

Technical Field

The invention relates to a children trailer.

Background

Existing children's trailers are often configured to be collapsible in order to reduce their size for storage and transport. Most of the trailer folding mechanisms are complex, still occupy large volume after being folded, and bring inconvenience to storage and transportation of the trailer. Accordingly, it is an effort of those skilled in the art to design and manufacture a child trailer which is compact in structure and occupies a small volume after being folded.

Disclosure of Invention

The invention aims to provide a novel children trailer.

In order to achieve the purpose, the invention adopts the technical scheme that: a children trailer comprises a trailer frame with an unfolding state and a folding state, and a front wheel assembly and a rear wheel assembly which are arranged at the bottom of the trailer frame, wherein the trailer frame comprises a front support, a rear support, an upper chassis assembly and a lower chassis assembly which are arranged between the front support and the rear support, the trailer frame is in the unfolding state, the front support and the rear support respectively extend along the vertical direction, the front wheel assembly is arranged at the bottom of the front support, the rear wheel assembly is arranged at the bottom of the rear support,

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 rotatably connected to the front bracket, the rear part of the second upper chassis is rotatably connected to the rear bracket, and the rear part of the first upper chassis is rotatably connected with the front part of the second upper chassis;

the lower bottom frame component comprises a connecting seat, a first lower bottom rod and a second lower bottom rod, wherein the first lower bottom rod and the second lower bottom rod extend in the front-back direction respectively;

when the trailer frame is in a folded state, the first upper chassis and the second upper chassis extend in the vertical direction and are folded between the front support and the rear support, and the first lower bottom rod and the second lower bottom rod extend in the left-right direction and are folded between the front support and the rear support.

Preferably, the trailer frame further comprises a side door assembly, the side door assembly is movably arranged at the left side part and/or the right side part of the trailer frame, the side door assembly has an open state and a closed state, and when the side door assembly is in the closed state, the side door assembly is positioned between the front support and the rear support along the front-back direction and at least partially exceeds the upper underframe assembly along the up-down direction; when the side door assembly is in a closed state, an access passage for people to go up and down is formed between the front support and the rear support above the upper underframe assembly.

Further, the side door subassembly includes preceding side door and back side door, preceding side door is connected with rotating around the first rotation center line that upper and lower direction extends on the fore-stock, the back side door is connected with rotating around the second rotation center line that upper and lower direction extends on the after-poppet, work as the trailer frame is in under fold condition, preceding side door draws in the fore-stock with between the first chassis of going up, the back side door draws in the after-poppet with between the second chassis of going up.

Further, the fore-stock has the branch and locates the left and right sides and all follow two preceding branches that the upper and lower direction extends, the after-poppet has the branch and locates the left and right sides and all follow two back branches that the upper and lower direction extends, the front portion of preceding side door is wound the axial lead of preceding branch sets up with rotating on the preceding branch, the rear portion of back side door is wound the axial lead of back branch sets up with rotating on the back branch.

Further preferably, the side door assembly is located along the left-right direction outside of the upper chassis assembly, the inside of the side door assembly and the outside of the upper chassis assembly are further provided with a locking mechanism for locking the side door assembly in the closed state.

Still further preferably, the front side door with between the first chassis of going up, the back side door with all be equipped with between the second chassis the side door locking mechanical system, the front side door with still be equipped with respectively on the back side door and be used for two sets of the unblock operating parts of side door locking mechanical system unblock.

Still further preferably, the lock seat has set firmly on the preceding side door/back side door, the unblock operating parts can be located along the fore-and-aft direction relative slip on the lock seat, side door locking mechanical system is including the locating piece that has the locked groove to and can insert coordinately the locking piece in the locked groove, the locating piece certainly the outside portion of chassis is outside protruding to extend on the first chassis/second, the locked groove is located the preceding lateral part or the rear side portion of locating piece, still seted up the confession on the lock seat the locating piece inserts the constant head tank coordinately, the locking piece set firmly in on the unblock operating parts and be located one side of locked groove, side door locking mechanical system still including providing the locking piece orientation the elastic component of the required effort of locked groove motion.

In a preferred embodiment, the front portion of the first lower bottom link and the rear portion of the second lower bottom link are located on the same side of the trailer frame, and the trailer frame is in the unfolded state, the first lower bottom link extends from front to rear with a gradual inward inclination, and the second lower bottom link extends from rear to front with a gradual inward inclination.

Further preferably, the front bracket is provided with two front support rods which are respectively arranged at the left side and the right side and extend along the vertical direction, and the first lower bottom rod is connected with the front bracket in a manner of relatively rotating around the axial lead of one of the front support rods; the rear support is provided with two rear supporting rods which are respectively arranged on the left side and the right side and extend along the vertical direction, the second lower bottom rod is connected with the rear support in a manner of relative rotation around the axial lead of one of the rear supporting rods, the rear part of the first lower bottom rod is connected with the connecting seat in a manner of rotation around a first shaft, the front part of the second lower bottom rod is connected with the connecting seat in a manner of rotation around a second shaft, and the first shaft and the second shaft extend along the vertical direction.

Still further preferably, a first gear is fixedly arranged at the rear part of the first lower bottom rod, a second gear is fixedly arranged at the front part of the second lower bottom rod, and the first gear and the second gear are arranged in a mutually meshed manner.

Due to the application of the technical scheme, compared with the prior art, the invention has the following advantages: the children trailer has simple structure, occupies small volume after being folded, and is convenient to store and transport.

Drawings

FIG. 1 is a schematic three-dimensional perspective view of a child trailer according to the present invention with the trailer frame in an expanded state (embodiment one);

FIG. 2 is an exploded view of the child trailer of the present invention with the trailer frame in an expanded configuration (embodiment one);

FIG. 3 is a schematic structural diagram (embodiment one) of a side door locking mechanism in a child trailer according to the present invention, wherein the side door locking mechanism is in an unlocked state;

FIG. 4 is a schematic structural diagram of a side door locking mechanism in a child trailer according to the present invention (embodiment I), wherein the side door locking mechanism is in a locked state;

FIG. 5 is a schematic diagram of a cross-sectional view of a side door locking mechanism corresponding to FIG. 4 (embodiment one);

FIG. 6 is a side view of the child trailer of the present invention with the trailer frame in a deployed position (embodiment one);

FIG. 7 is a schematic top view of the child trailer of the present invention with the trailer frame in a deployed position (embodiment one);

FIG. 8 is a side view of the child trailer of the present invention during transition from the expanded to the collapsed configuration of the trailer frame (embodiment one);

FIG. 9 is a schematic top view of the child trailer of the present invention during transition from the deployed to the collapsed positions of the trailer frame (embodiment one);

FIG. 10 is a schematic three-dimensional perspective view of the child trailer of the present invention with the trailer frame in a folded position (embodiment one);

FIG. 11 is a side view of the child trailer of the present invention with the trailer frame in a folded position (embodiment one);

FIG. 12 is a schematic top view of the child trailer of the present invention with the trailer frame in a folded position (embodiment one);

FIG. 13 is a schematic three-dimensional perspective view of the child trailer of the present invention with the trailer frame in a deployed position (embodiment two);

FIG. 14 is a schematic three-dimensional perspective view of the child trailer of the present invention with the trailer frame in a folded position (embodiment two);

FIG. 15 is an enlarged partial schematic view of the child trailer of the present invention corresponding to position A in FIG. 14 (embodiment two);

wherein: 100. a trailer frame; 200. a front wheel assembly; 300. a rear wheel assembly;

1. a front bracket; 11. a front support rod; 12. a front cross strut;

2. a rear bracket; 21. a rear support rod; 22. a rear cross strut;

3. an upper chassis assembly; 31. a first upper chassis; 31a, a first upper bottom bar; 32. a second upper bottom bar; 32a, a second upper bottom bar;

4. a lower chassis assembly; 41. a connecting seat; 42. a first lower bottom bar; 43. a second lower bottom bar;

5. a side door assembly; 51. a front side door; 52. a rear side door; 53. a lock seat; 53a, a positioning groove;

6. a side door locking mechanism; 61. positioning blocks; 61a, a lock groove; 62. a locking block; 63. an elastic member (spring);

7. an unlocking operation member; 71. an accommodating groove;

8. a tow bar; 81. a towing rod body; 82. a grip;

9. an upper head frame assembly; 91. a transfer seat; 92. a first upper ejector rod; 93. a second upper ejector rod; 94. a shaft sleeve; 94a, a limit groove; 95. a spacing pin;

a. a first shaft; b. a second shaft; c. the axis of the front strut; d. the axis of the rear strut; e. a first rotational centerline; f. 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.

Example one

A children's trailer comprises a trailer frame 100 with an unfolded state and a folded state, a front wheel assembly 200 and a rear wheel assembly 300 which are arranged at the bottom of the trailer frame 100.

The trailer frame 100 includes a front frame 1 and a rear frame 2 extending in the up-down direction in an unfolded state, and the front frame 1 includes two front stays 11 provided on the left and right sides and extending in the up-down direction, and a front cross stay 12 provided between the lower portions of the two front stays 11 and extending in the left-right direction. The rear bracket 2 has two rear stays 21 provided on the left and right sides and extending in the vertical direction, and a rear cross stay 22 provided between the lower portions of the two rear stays 21 and extending in the horizontal direction.

The trailer frame 100 further comprises an upper chassis assembly 3 and a lower chassis assembly 4 disposed between the front and rear brackets 1, 2. When the trailer frame 100 is in the unfolded state, the upper chassis assembly 3 includes a first upper chassis 31 and a second upper chassis 32 extending in the front-rear direction, respectively, a front portion of the first upper chassis 31 is rotatably connected to the front bracket 1, a rear portion of the second upper chassis 32 is rotatably connected to the rear bracket 2, and a rear portion of the first upper chassis 31 is rotatably connected to a front portion of the second upper chassis 32. Specifically, the first upper chassis 31 includes first upper bottom bars 31a that are respectively provided on the left and right sides of the trailer frame 100 and each extend in the front-rear direction, the second upper chassis 32 includes second upper bottom bars 32a that are respectively provided on the left and right sides of the trailer frame 100 and each extend in the front-rear direction, the front end portion of the first upper bottom bar 31a is rotatably provided on the front stay 11, the rear end portion of the second upper bottom bar 32a is rotatably provided on the rear stay 21, the rear end portion of the first upper bottom bar 31a is rotatably connected to the front end portion of the second upper bottom bar 32a, and the first upper bottom bar 31a and the second upper bottom bar 32a extend in substantially the same longitudinal direction in the expanded state.

The lower chassis assembly 4 includes a coupling seat 41, and a first lower base bar 42 and a second lower base bar 43 extending in the front-rear direction, respectively, in the unfolded state. Specifically, the first lower bottom bar 42 extends gradually obliquely inward from front to rear, and the second lower bottom bar 43 extends gradually obliquely inward from rear to front. The front portion of the first lower bottom link 42 and the rear portion of the second lower bottom link 43 are located on the same side of the trailer frame 100, wherein the front portion of the first lower bottom link 42 is connected to the front frame 1 so as to rotate relatively around the axis c of the front link 11 on that side, the rear portion of the second lower bottom link 43 is connected to the rear frame 2 so as to rotate relatively around the axis d of the rear link 21 on that side, the rear portion of the first lower bottom link 42 is connected to the link base 41 so as to rotate around the first axis a, the front portion of the second lower bottom link 43 is connected to the link base 41 so as to rotate around the second axis b, and the first axis a and the second axis b both extend in the vertical direction and are parallel to each other.

The trailer frame 100 further comprises a side door assembly 5 movably arranged on the left side portion and/or the right side portion of the trailer frame 100, in this embodiment, the side door assembly 5 is rotatably arranged on the left side of the advancing direction of the trailer frame 100, and the side door assembly 5 is located on the outer side of the upper underframe assembly 3 along the left-right direction.

Specifically, the side door assembly 5 includes a front side door 51 and a rear side door 52, the front side door 51 is rotatably connected to the front bracket 1 about a first rotation center line e extending in the up-down direction, and the rear side door 52 is rotatably connected to the rear bracket 2 about a second rotation center line f extending in the up-down direction. Specifically, in the present embodiment, the front portion of the front side door 51 is rotatably provided on the front strut 11 about the axis c of the front strut 11, and the rear portion of the rear side door 52 is rotatably provided on the rear strut 21 about the axis d of the rear strut 21. The axis c of the front strut 11 extends collinear with the first axis of rotation e and the axis d of the rear strut 21 extends collinear with the second axis of rotation f.

The side door assembly 5 has an open state and a closed state, when the side door assembly 5 is in the closed state, the side door assembly 5 is located between the front bracket 1 and the rear bracket 2 along the front-rear direction, the front side door 51 and the rear side door 52 extend along the same length direction approximately, and at least part of the upper chassis assembly 3 is higher than that of the lower part of the upper chassis assembly 3 in the up-down direction of each of the front side door 51 and the rear side door 52. When the side door assembly 5 is to be closed, the front side door 51 and the rear side door 52 are respectively pushed inwards, the front side door 51 rotates inwards around the axis c of the front support rod 11, and the front side door 51 and the front support 1 gradually approach to each other in the front-rear direction; the rear side door 52 rotates inward around the axial line d of the rear stay 21, and the rear side door 52 and the rear bracket 2 gradually move toward each other in the front-rear direction. When the side door assembly 5 is in the open state, the front side door 51 is relatively closed to the front carrier 1 in the front-rear direction, and the front side door 51 is closed between the left and right front stays 11 in the left-right direction. The rear side door 52 and the rear bracket 2 are relatively closed in the front-rear direction, and the rear side door 52 is closed between the left and right rear stays 21 in the left-right direction. At this time, an access passage for a person to go up and down is formed between the front frame 1 and the rear frame 2 above the upper chassis assembly 3.

In this embodiment, a side door locking mechanism 6 for locking the side door assembly 5 in a closed state is further provided between the inner side portion of the side door assembly 5 and the outer side portion of the upper chassis assembly 3. The side door lock mechanisms 6 have two sets, and the two sets of side door lock mechanisms 6 are respectively provided between the front side door 51 and the first upper chassis 31, and between the rear side door 52 and the second upper chassis 32. Correspondingly, the front side door 51 and the rear side door 52 are also provided with unlocking operation members 7 for unlocking the two sets of side door locking mechanisms 6, respectively.

Specifically, a lock seat 53 is fixedly arranged on the front side door 51/the rear side door 52, a positioning groove 53a is formed in the inner side portion of the lock seat 53, the side door locking mechanism 6 includes a positioning block 61 arranged on the first upper bottom rod 31 a/the second upper bottom rod 32a, the positioning block 61 extends outwards in a protruding manner from the outer side portion of the first upper bottom frame 31/the second upper bottom frame 32 and corresponds to the positioning groove 53a, and the positioning block 61 can be fittingly inserted into the positioning groove 53 a.

The positioning block 61 is provided with a locking groove 61a, the locking seat 53 further has a hollow groove extending in the front-rear direction and communicating with the positioning groove 53a, the release operation member 7 is inserted into the hollow groove in a sliding fit manner along the length direction of the hollow groove, a side portion of the release operation member 7 facing the positioning groove 53a is provided with a receiving groove 71, and the receiving groove 71 communicates with the positioning groove 53a and is used for receiving the positioning block 61. The side door locking mechanism 6 further includes a lock block 62, and the lock block 62 is fixedly disposed at the opening of the receiving groove 71 and located at one side of the lock groove 61 a. When the side door lock mechanism 6 is in the locked state, the positioning block 61 is fittingly inserted in the positioning groove 53a, and the lock block 62 is fittingly inserted in the lock groove 61a, so that the positioning block 61 is kept fitted with the positioning groove 53 a. When the side door locking mechanism 6 is unlocked, the unlocking operation member 7 is pressed, the unlocking operation member 7 slides towards the hollow groove along the length extending direction of the hollow groove, the locking block 62 is separated from the locking groove 61a, at the moment, the positioning block 61 can be separated from the positioning groove 53a, and the side door locking mechanism 6 is in an unlocking state.

The side door locking mechanism 6 further includes an elastic member 63 that provides a force required for the lock block 62 to move toward the lock groove 61 a. Specifically, in the present embodiment, the elastic member 63 is a spring extending along the length direction of the hollow cavity, one end portion of the spring in the length direction abuts against the inner side end wall of the hollow cavity, and the other end portion abuts against the unlocking operation member 7. When the unlocking operation member 7 is pressed, the spring is pressed to accumulate elastic force, when the unlocking operation member 7 is released, the spring releases the elastic force to drive the unlocking operation member 7 to slide towards the outside of the hollow groove along the length direction of the hollow cavity, and the locking block 62 moves towards the locking groove 61 a.

A first gear 42a is fixedly disposed at the rear portion of the first lower bottom rod 42, and a second gear 43a is fixedly disposed at the front portion of the second lower bottom rod 43. The first gear 42a and the second gear 43a are disposed in mesh with each other. When the trailer frame 100 needs to be folded, the first lower bottom rod 42 rotates inward around the first axis a, and through the meshing transmission between the first gear 42a and the second gear 43a, the rotation of the first lower bottom rod 42 drives the second lower bottom rod 43 to synchronously rotate inward around the second axis b, and the first lower bottom rod 42 and the second lower bottom rod 43 are gradually folded relatively. It will be appreciated that the driving and driven relationships described above are vice versa.

In this embodiment, the trailer frame 100 further includes a towing bar 8 extending in the up-down direction, the towing bar 8 includes a towing bar body 81 extending in the up-down direction, and a grip 82 disposed at an upper end portion of the towing bar body 81, wherein a lower end portion of the towing bar body 81 is rotatably disposed at a middle position of the front cross bar 12 in the left-right direction.

The front wheel assembly 200 has two sets of the bottoms of the two front stays 11 respectively disposed on the left and right sides, and the rear wheel assembly 300 has two sets of the bottoms of the two rear stays 21 respectively disposed on the left and right sides, and the front wheel assembly 200 in this embodiment is a universal wheel assembly, the two sets of front wheel assemblies 200 are respectively disposed on the bottoms of the front stays 11 on the same side in a universal rotation manner, and the distance between the two sets of front wheel assemblies 200 in the left-right direction is smaller than the distance between the two sets of rear wheel assemblies 300 in the left-right direction.

When the trailer frame 100 is in the unfolded state, the front frame 1 and the rear frame 2 respectively extend in the up-down direction, the first upper chassis 31 and the second upper chassis 32 are opened relatively, and the first upper chassis 31 and the second upper chassis 32 extend from front to back in substantially the same length direction. The first lower bottom bar 42 is opened opposite to the second lower bottom bar 43, the first lower bottom bar 42 extends gradually obliquely inward from front to rear, and the second lower bottom bar 43 extends gradually obliquely inward from rear to front. The front bracket 1, the rear bracket 2, and the upper chassis component 3 and the lower chassis component 4 between the front bracket and the rear bracket form a bearing space for accommodating children. The side door assembly 5 can be freely switched between an open state and a closed state, and when the side door assembly 5 is in the open state, a child can conveniently enter the bearing space from the left side of the advancing direction of the trailer; when the side door assembly 5 is in the closed state, the side door assembly 5 provides lateral protection to a child seated on the trailer, improving the safety of the child seated on the trailer.

When the trailer frame 100 is folded, the unlocking operation member 7 is pressed to unlock the side door locking mechanism 6, and the front side door 51 and the rear side door 52 are respectively pushed inward, the front side door 51 rotates inward around the axial line c of the front support rod 11, the front side door 51 and the front support 1 gradually move closer to each other in the front-rear direction, the rear side door 52 rotates inward around the axial line d of the rear support rod 21, and the rear side door 52 and the rear support 2 gradually move closer to each other in the front-rear direction.

Subsequently, the front bracket 1 is pulled backwards, the rear bracket 2 is pulled forwards, the front bracket 1 and the rear bracket 2 are gradually and relatively closed in the front-rear direction, meanwhile, the first upper chassis 31 rotates upwards around the rotating connection part between the first upper chassis and the front bracket 1, the second upper chassis 32 rotates upwards around the rotating connection part between the second upper chassis and the rear bracket 2, and the first upper chassis 31 and the second upper chassis 32 are gradually folded between the front bracket 1 and the rear bracket 2 in the front-rear direction; the first lower bottom bar 42 and the second lower bottom bar 43 are gradually and oppositely gathered in the front-rear direction.

When the trailer frame 100 is in the folded state, the front bracket 1 and the rear bracket 2 are folded in the front-rear direction, the first upper chassis 31 and the second upper chassis 32 extend in the up-down direction and are folded between the front bracket 1 and the rear bracket 2, and the first lower bottom bar 42 and the second lower bottom bar 43 extend in the left-right direction and are folded between the front bracket 1 and the rear bracket 2. The front side door 51 is gathered between the front frame 1 and the first upper chassis 31, the rear side door 52 is gathered between the rear frame 2 and the second upper chassis 32, the front wheel assembly 200 and the rear wheel assembly 300 are relatively gathered together in the front-rear direction, and the front wheel assembly 200 is gathered inside the rear wheel assembly 300 on each of the left and right sides of the trailer frame 100.

In conclusion, the child trailer in the embodiment has a simple structure, occupies a small volume after being folded, and is convenient to store and transport. Child's trailer in this embodiment still is provided with side door assembly 5, is in under the open mode at side door assembly 5, and children can be conveniently from the left side entering this child's trailer of trailer advancing direction, and under side door assembly 5 is in the closed mode, side door assembly 5 provides children side direction protection, improves this child's trailer's security.

Example two

Referring to fig. 12 and 13, the difference between the first embodiment and the second embodiment is mainly: the trailer frame 100 further includes an upper head frame assembly 9 provided on one side in the left-right direction, and the upper head frame assembly 9 in the present embodiment is specifically located on the other side in the left-right manner from the front portion of the first lower bottom bar 42 and the rear portion of the second lower bottom bar 43.

Specifically, the upper head frame assembly 9 includes an adapter 91, and a first upper head rail 92 and a second upper head rail 93 that extend in the front-rear direction, respectively, in the deployed state. The front end of the first upper push rod 92 is rotatably disposed on the front support rod 11 around the axis c of the front support rod 11, the rear end of the second upper push rod 93 is rotatably disposed on the rear support rod 21 around the axis d of the rear support rod 21, and the rear end of the first upper push rod 92 and the front end of the second upper push rod 93 are rotatably connected to the adapter 91, respectively.

In this embodiment, the upper support frame assembly 9 further includes a shaft sleeve 94 respectively fixed to the front end portion of the first upper support rod 92 and the rear end portion of the second upper support rod 93, the shaft sleeve 94 on the first upper support rod 92 is rotatably sleeved on the front support rod 11 around the axial line c of the front support rod 11, and the shaft sleeve 94 on the second upper support rod 93 is rotatably sleeved on the rear support rod 21 around the axial line d of the rear support rod 21.

Referring to fig. 14, the shaft sleeve 94 is provided with a limiting groove 94a extending along the circumferential direction, the limiting groove 94a has a first position and a second position respectively located at two end portions of the shaft sleeve in the length extending direction, the upper head frame assembly 9 further includes two limiting pins 95 respectively fixed on the front support rod 11 and the rear support rod 21, the two limiting pins 95 are both arranged in the corresponding limiting groove 94a in a sliding fit manner along the length extending direction of the limiting groove 94a, when the trailer frame 100 is in the unfolded state, the limiting pins 95 are located at the first position, the first upper head rod 92 and the second upper head rod 93 are relatively opened along the front-rear direction, and the two are approximately along the same length direction. When the trailer frame 100 is folded, the first upper top rod 92 rotates inwards around the axis c of the front support rod 11, the second upper top rod 93 rotates inwards around the axis d of the rear support rod 21, the first upper top rod 92 and the second upper top rod 93 are gradually and relatively folded, and meanwhile, the two limit pins 95 slide from the first position to the second position along the length direction of the limit groove 94 a. When the trailer frame 100 is in the folded state, the first upper top rod 92 and the second upper top rod 93 are folded in the front-rear direction between the front bracket 1 and the rear bracket 2, and the two limit pins 95 are both located at the second position.

In conclusion, the child trailer in the embodiment has a simple structure, occupies a small volume after being folded, and is convenient to store and transport. Roof rack subassembly 9 is gone up in the setting of children's trailer in this embodiment, is favorable to improving the structural strength of this children's trailer when the expansion state, ensures children's safety, simultaneously, when trailer frame 100 is folded, also do not take place to interfere with other parts.

The above-mentioned embodiments are merely illustrative of the technical idea 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 scope of the present invention, and all equivalent changes or modifications made according to the spirit of the present invention should be covered in the scope of the present invention.

Claims

1. The utility model provides a children's trailer, includes the trailer frame that has expansion state and fold condition, locates front wheel subassembly and rear wheel subassembly of trailer frame bottom, its characterized in that: the trailer frame comprises a front bracket, a rear bracket, an upper chassis component and a lower chassis component which are arranged between the front bracket and the rear bracket, wherein the trailer frame is in an unfolded state, the front bracket and the rear bracket respectively extend along the vertical direction, the front wheel component is arranged at the bottom of the front bracket, the rear wheel component is arranged at the bottom of the rear bracket,

2. The children's trailer of claim 1, wherein: the trailer frame further comprises a side door assembly, the side door assembly is movably arranged on the left side part and/or the right side part of the trailer frame, the side door assembly is in an open state and a closed state, and when the side door assembly is in the closed state, the side door assembly is located between the front support and the rear support along the front-back direction and at least partially exceeds the upper underframe assembly along the up-down direction; when the side door assembly is in a closed state, an access passage for people to go up and down is formed between the front support and the rear support above the upper underframe assembly.

3. The children's trailer of claim 2, wherein: the side door subassembly includes preceding side door and back side door, preceding side door is connected with rotating around the first rotation central line that upper and lower direction extends on the fore-stock, the back side door is connected with rotating around the second rotation central line that upper and lower direction extends on the after-poppet, work as the trailer frame is in under fold condition, preceding side door draws in the fore-stock with between the first chassis of going up, the back side door draws in the after-poppet with between the second goes up the chassis.

4. The children's trailer of claim 3, wherein: the fore-stock has the branch and locates the left and right sides and all follow two preceding branches that the upper and lower direction extends, the after-poppet has the branch and locates the left and right sides and all follow two back branches that the upper and lower direction extends, the front portion of preceding side door is wound the axial lead of preceding branch sets up with rotating on the preceding branch, the rear portion of back side door is wound the axial lead of back branch sets up with rotating on the back branch.

5. The children's trailer of claim 3, wherein: the side door subassembly is located along left and right directions go up the outside of chassis subassembly, the inside portion of side door subassembly with still be provided with between the outside portion of going up the chassis subassembly and be used for with the side door subassembly is locked side door locking mechanical system under the closed condition.

6. The children's trailer of claim 5, wherein: the front side door with between the first chassis of going up the back side door with all be equipped with between the second chassis side door locking mechanical system, the front side door with still be equipped with respectively on the back side door and be used for two sets of the unblock operating parts of side door locking mechanical system unblock.

7. The children's trailer of claim 6, wherein: preceding side door/back side door is last to have set firmly the lock seat, the unblock operating parts can be located along fore-and-aft direction relative slip on the lock seat, side door locking mechanical system is including the locating piece that has the locked groove to and can insert with coordinating the locking piece in the locked groove, the locating piece certainly the outside portion of chassis extends to the outside protrusion on the first chassis/second of going up, the locked groove is located the preceding lateral part or the back lateral part of locating piece, still seted up the confession on the lock seat the locating piece inserts the constant head tank with coordinating, the locking piece set firmly in on the unblock operating parts and be located one side of locked groove, side door locking mechanical system still includes and provides the locking piece orientation the elastic component of the required effort of locked groove motion.

8. The children's trailer according to any one of claims 1 to 7, wherein: the front part of the first lower bottom rod and the rear part of the second lower bottom rod are positioned on the same side of the trailer frame, the trailer frame is in a spreading state, the first lower bottom rod gradually extends inwards in an inclined mode from front to back, and the second lower bottom rod gradually extends inwards in an inclined mode from back to front.

9. The children's trailer of claim 8, wherein: the front support is provided with two front support rods which are respectively arranged at the left side and the right side and extend along the vertical direction, and the first lower bottom rod is connected with the front support in a manner of relative rotation around the axial lead of one of the front support rods; the rear support is provided with two rear supporting rods which are respectively arranged on the left side and the right side and extend along the vertical direction, the second lower bottom rod is connected with the rear support in a manner of relative rotation around the axial lead of one of the rear supporting rods, the rear part of the first lower bottom rod is connected with the connecting seat in a manner of rotation around a first shaft, the front part of the second lower bottom rod is connected with the connecting seat in a manner of rotation around a second shaft, and the first shaft and the second shaft extend along the vertical direction.

10. The children's trailer of claim 9, wherein: the rear part of the first lower bottom rod is fixedly provided with a first gear, the front part of the second lower bottom rod is fixedly provided with a second gear, and the first gear and the second gear are arranged in an intermeshing manner.