CN211568069U

CN211568069U - Foldable joint and stroller with same

Info

Publication number: CN211568069U
Application number: CN201921549380.9U
Authority: CN
Inventors: 彭水毅; 祝军旺
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-09-17
Filing date: 2019-09-17
Publication date: 2020-09-25
Anticipated expiration: 2029-09-17

Abstract

The utility model discloses a foldable joint and a children stroller with the same, wherein the joint comprises a fixed seat, a rotating seat and a locking device arranged between the fixed seat and the rotating seat, the fixed seat comprises a first connecting part and two second connecting parts which respectively extend outwards from two sides of the upper end of the first connecting part at intervals, the lower side of the rotating seat is pivoted between the two second connecting parts, the locking device comprises a first locking piece and a second locking piece, one side of the first locking piece and one side of the second locking piece are connected in the rotating seat in a relatively movable manner, a first locking hole and a second locking hole are respectively arranged on the two second connecting parts, a first spring is arranged between the first locking piece and the rotating seat, and a second spring is arranged between the second locking piece and the rotating seat, under the effect of first, second spring, the opposite side of two locking pieces is gone into respectively in first, the second locking hole, thereby the utility model discloses locked in the expansion state by reliable and stable.

Description

Foldable joint and stroller with same

Technical Field

The utility model relates to an infant product field especially relates to a collapsible joint and be equipped with children's shallow of this joint.

Background

For convenience of carrying and storage, the stroller or seat is configured to be convertible between an unfolded position and a folded position, and the structure of the stroller and seat also includes one or more foldable joints that are convertible between the unfolded position and the folded position, i.e., when the stroller or seat is in the unfolded position, the joints are locked in the unfolded position, and when the stroller or seat is in the folded position, the joints are also in the folded position.

Since the reliability of the unfolded state of the child or the seat cart is to be ensured, the reliability of the folding mechanism is also required to be ensured.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome above-mentioned shortcoming, provide a reliable collapsible joint of locking and be equipped with this collapsible articulated children's shallow.

In order to achieve the above object, the utility model adopts the following technical scheme:

a foldable joint comprises a fixed seat and a rotating seat which are mutually pivoted, and a locking device which is arranged between the fixed seat and the rotating seat and is used for limiting the relative rotation of the fixed seat and the rotating seat, the fixed seat comprises a first connecting part and two second connecting parts which respectively extend outwards from two sides of the upper end of the first connecting part at intervals, the lower side of the rotating seat is pivoted between the two second connecting parts, the locking device comprises a first locking part and a second locking part, one side of the first locking part and one side of the second locking part are connected in the rotating seat in a relatively movable manner, a first locking hole and a second locking hole are respectively arranged on the two second connecting parts, a first spring is arranged between the first locking part and the rotating seat, and a second spring is arranged between the second locking part and the rotating seat, under the action of the first spring and the second spring, the opposite sides of the first locking piece and the second locking piece are respectively clamped into the first locking hole and the second locking hole; preferably, the first locking member is located on the upper side of the second locking member.

The lower side of a release piece can be connected in the rotating seat in a relatively up-and-down moving mode, the release piece is matched with the first locking piece and the second locking piece, and the release piece is driven to move downwards to force the first locking piece and the second locking piece to move in opposite directions and to be disengaged from the first locking hole and the second locking hole respectively.

The first locking piece comprises a first body, a first matching part and a first clamping part, wherein the first matching part extends from the first body to the opposite side; the second locking piece comprises a second body, a second matching part and a second clamping part, wherein the second matching part and the second clamping part extend from the second body to the same side; under the action of the first spring and the second spring, the opposite sides of the first clamping part and the second clamping part are clamped into the first locking hole and the second locking hole respectively.

The unlocking piece is provided with a first driving inclined plane and a second driving inclined plane which are vertically spaced, the inclination directions of the first driving inclined plane and the second driving inclined plane are opposite, the first matching part is provided with a first driven inclined plane matched with the first driving inclined plane, the second matching part is provided with a second driven inclined plane matched with the second driving inclined plane, and the inclination directions of the first driving inclined plane and the second driving inclined plane are also opposite.

The first matching part is provided with a through hole which penetrates through the first matching part up and down, and a second driving inclined plane of the unlocking piece downwards penetrates through the through hole of the first matching part and then is matched with the second driven inclined plane; preferably, the upper end surface of the first matching part is respectively recessed downwards and obliquely at two sides of the through hole to form two first driven inclined planes, and correspondingly, the two sides of the release piece are both provided with the first driving inclined planes; preferably, the second engaging portion is provided with a groove having an upward opening, one side wall of the groove is provided with the second driven inclined surface, and the lower end surface of the unlocking member is provided with the second driving inclined surface.

The rotary seat is characterized in that an upper accommodating space and a lower accommodating space which are communicated with each other from top to bottom are formed in the lower side of the rotary seat, one side of the first locking piece can be arranged in the upper accommodating space in a relatively movable mode, one side of the second locking piece can be arranged in the lower accommodating space in a relatively movable mode, the first locking piece further comprises a guide post extending from one side of the first body, the guide post is consistent with the extending direction of the first matching portion, and a guide hole is formed in the side wall of the corresponding side of the upper accommodating space and used for the guide post to be inserted in a relatively movable mode.

The lower side of the rotary seat is arranged towards an opening on one side, the side is connected with a seat cover, an upper accommodating space and a lower accommodating space which are communicated up and down are formed between the lower side of the rotary seat and the seat cover, a first through hole is formed in the seat cover, a second through hole is formed in the side wall of the rotary seat, which is far away from the seat cover, and the opposite sides of the first clamping part and the second clamping part respectively penetrate through the first through hole and the second through hole and then are clamped into the first locking hole and the second locking hole; preferably, the seat cover comprises a plate body and a partition plate extending from the plate body to one side of the rotary seat, and the partition plate divides the space between the seat cover and the rotary seat into the upper accommodating space and the lower accommodating space which are communicated with each other.

The first locking hole and the second locking hole are respectively provided with three spaced locking holes, and correspondingly, the first clamping part and the second clamping part are respectively provided with three clamping rods; preferably, the outer wall of at least one of the three clamping rods of the first locking member is provided with a guide rib in a protruding manner, the inner wall of the first locking hole corresponding to the clamping rod is provided with a guide groove, and when the clamping rod is inserted into the corresponding first locking hole, the guide rib is also inserted into the guide groove; the outer wall of at least one of the three clamping rods of the second locking piece is provided with a guide rib in a protruding mode, and the inner wall of the corresponding second locking hole is also provided with a guide groove.

The side walls of the upper accommodating space and the lower accommodating space on the same side are respectively provided with a first guide accommodating groove and a second guide accommodating groove, and the first matching part and the second matching part can be inserted into the first guide accommodating groove and the second guide accommodating groove in a relatively movable manner.

A stroller comprises the foldable joint, a first rod piece, a second rod piece and two third rod pieces, wherein the upper end of the first rod piece is connected with the fixed seat, the lower end of the second rod piece is connected with the rotating seat, the upper ends of the two third rod pieces are respectively connected with the two second connecting parts, the upper end of the first rod piece is fixedly connected with the first connecting part, and the upper ends of the two third rod pieces are respectively pivoted with the two second connecting parts; or the upper end of the first rod piece is pivoted to the first connecting part, and the upper ends of the two third rod pieces are respectively and fixedly connected to the two second connecting parts.

The utility model has the advantages that:

1. the foldable joint of the utility model is locked by the upper and lower locking pieces simultaneously, thereby ensuring the stability and reliability of the joint and the stroller with the joint in the locking state;

2. the first locking piece and the second locking piece can respectively move reversely to be separated from the corresponding first locking hole and second locking hole as long as the unlocking piece is moved downwards, so that the locking device is unlocked, and the unlocking operation is very simple.

Drawings

Fig. 1 is a schematic plan view of the stroller of the present invention in an unfolded state;

figure 2 is a perspective view of the stroller in the unfolded state

Fig. 3 is an enlarged schematic view of the fixing seat of the stroller of the present invention;

fig. 4 is a second schematic perspective view of the stroller of the present invention in an unfolded state;

fig. 5 is an enlarged schematic view of the foldable joint of the present invention;

3 FIG. 3 6 3 is 3 a 3 schematic 3 cross 3- 3 sectional 3 view 3 taken 3 along 3 the 3 line 3 A 3- 3 A 3 in 3 FIG. 3 1 3; 3

FIG. 7 is an enlarged view of the portion C of FIG. 6;

FIG. 8 is an exploded enlarged schematic view according to FIG. 5;

FIG. 9 is an enlarged cross-sectional view taken along the line B-B in FIG. 5;

fig. 10 is an enlarged schematic view of the rotary seat of the folding mechanism of the present invention;

fig. 11 is an enlarged schematic view of the folding mechanism of the present invention after the rotating seat, the first locking member and the second locking member are combined;

fig. 12 is a first schematic view of the folding process of the stroller of the present invention;

FIG. 13 is a schematic cross-sectional view according to FIG. 12;

FIG. 14 is an enlarged view of the portion D of FIG. 13;

fig. 15 is a second schematic view of the folding process of the stroller of the present invention;

fig. 16 is a schematic plan view of the stroller of the present invention in a folded state;

fig. 17 is a schematic perspective view of the stroller of the present invention in a folded state.

Detailed Description

As shown in fig. 1 to 11, the foldable joint of the present invention comprises a fixed base 1 and a rotary base 2 pivotally connected to each other, and a locking device disposed between the fixed base 1 and the rotary base 2 for limiting the relative rotation between the fixed base 1 and the rotary base 2, wherein the fixed base 1 comprises a first connecting portion 11, two second connecting portions 12 extending from two sides of the upper end of the first connecting portion 11 at intervals, respectively, the lower side of the rotary base 2 is pivotally connected between the two second connecting portions 12, the locking device comprises a first locking member 5 and a second locking member 6 connected to the rotary base 2 in a relatively movable manner at one side, a first locking hole 121 and a second locking hole 122 disposed on the two second connecting portions 12, respectively, a first spring 7 disposed between the first locking member 5 and the rotary base 2, and a second spring 8 disposed between the second locking member 6 and the rotary base 2, the first locking piece 5 is located on the upper side of the second locking piece 6, and under the action of the first spring 7 and the second spring 8, the opposite sides of the first locking piece 5 and the second locking piece 6 are respectively clamped into the first locking hole 121 and the second locking hole 122.

The lower side of a release piece 9 can be connected in the rotating base 2 in a relatively up-and-down moving manner, and the release piece 9 is matched with the first locking piece 5 and the second locking piece 6, so that the release piece 9 is driven to move downwards to force the first locking piece 5 and the second locking piece 6 to move in opposite directions and to be disengaged from the first locking hole 121 and the first locking hole respectively. Thus, the locking device is unlocked, and the rotating seat 2 can rotate relative to the fixed seat 1.

The first locking member 5 includes a first body 51, a first engaging portion 52 and a first engaging portion 53 extending from the first body 51 to the opposite side; the second locking element 6 comprises a second body 61, a second matching part 62 and a second clamping part 63, wherein the second matching part 62 and the second clamping part 63 extend from the second body 61 to the same side, the first matching part 52 and the second matching part 62 are positioned on the same side, and the release element 9 is matched with the first matching part 52 and the second matching part 62; the first spring 7 and the second spring 8 are configured such that the first engaging portion 53 and the second engaging portion 63 are engaged with the first locking hole 121 and the second locking hole 122, respectively, at opposite sides thereof.

The unlocking member 9 is provided with a first driving inclined surface 91 and a second driving inclined surface 92 which are spaced from each other up and down, the inclined directions of the first driving inclined surface 91 and the second driving inclined surface 92 are opposite, the first matching portion 52 is provided with a first driven inclined surface 521 which is matched with the first driving inclined surface 91, the second matching portion 62 is provided with a second driven inclined surface 621 which is matched with the second driving inclined surface 92, and the inclined directions of the first driving inclined surface 91 and the second driving inclined surface 92 are also opposite. Therefore, when the first locking member 5 moves downward, the first engaging portion 53 moves to one side to be disengaged from the first locking hole 121 by the engagement of the first driving inclined surface 91 and the first driven inclined surface 521, and the second engaging portion 63 moves to the opposite side to be disengaged from the second locking hole 122 by the engagement of the second driving inclined surface 92 and the second driven inclined surface 621.

In this embodiment, the first matching portion 52 is provided with a through hole 522 penetrating up and down, and the second driving inclined surface 92 of the release lock 9 penetrates down through the through hole 522 of the first matching portion 52 and then matches with the second driven inclined surface 621.

The upper end surface of the first matching portion 52 is recessed obliquely downward at two sides of the through hole 522 to form two first driven inclined surfaces 521, and correspondingly, the two sides of the unlocking piece 9 are provided with the first driving inclined surfaces 91. So that the lower side of the unlocking member 9 passes through the through hole 522 downward, and the first active inclined surfaces 91 at both sides thereof are respectively matched with the two first active inclined surfaces 91.

The second fitting portion 62 is provided with a groove having an upward opening, one side wall of the groove is provided as the second driven inclined surface 621, and the lower end surface of the unlocking member 9 is provided as the second active inclined surface 92.

Preferably, an upper receiving space 21 and a lower receiving space 22 which are communicated with each other up and down are provided in the lower side of the rotating base 2, one side of the first locking member 5 is relatively movably disposed in the upper receiving space 21, and one side of the second locking member 6 is relatively movably disposed in the lower receiving space 22. The upper receiving space 21 communicates with the lower receiving space 22 so that the lower side of the unlocking member 9 can pass through.

The side walls of the upper receiving space 21 and the lower receiving space 22 on the same side are respectively provided with a first guiding receiving groove 23 and a second guiding receiving groove 24 into which the first matching portion 52 and the second matching portion 62 can be relatively movably inserted. The arrangement is such that the movement of the first locking member 5 and the second locking member 6 is smoother and does not deviate.

Preferably, the first locking member 5 further includes a guiding post 54 extending from the first body 51 to one side, and the extending direction of the guiding post 54 is the same as that of the first matching portion 52, and a guiding hole 25 is disposed on a side wall of the upper receiving space 21 corresponding to the side wall for the guiding post 54 to be inserted in a relatively movable manner. The first spring 7 may be disposed between the guide post 54 and the bottom wall of the guide hole 25, or disposed between the first matching portion 51 and the bottom wall of the first guide receiving groove 23.

The side walls of the upper accommodating space 21 and the lower accommodating space 22 in opposite directions are respectively provided with a first through hole 26 and a second through hole 27, and the opposite sides of the first engaging portion 53 and the second engaging portion 63 respectively penetrate through the first through hole 26 and the second through hole 27 and then are clamped into the first locking hole 121 and the second locking hole 122.

In this embodiment, the first locking hole 121 and the second locking hole 122 are respectively provided with three spaced apart locking holes, and correspondingly, the first engaging portion 53 and the second engaging portion 63 are respectively provided with three locking rods. Correspondingly, three first through holes 26 and three second through holes 27 are respectively arranged.

In this embodiment, preferably, in order to make the two locking members and the two locking holes more matched, a guide rib 55 is protruded from an outer wall of at least one of the three clamping bars of the first locking member 5, corresponding guide grooves 261 are respectively formed on inner walls of the first through hole 26 and the first locking hole 121 corresponding to the clamping bar, and when the clamping bar is inserted into the corresponding first locking hole 121 after passing through the corresponding first through hole 26, the guide rib 55 is also inserted into the guide groove 261, thereby facilitating the matching of the first locking member 5 and the first locking hole 121. Similarly, at least one of the three locking rods of the second locking member 6 has a guide rib 65 protruding from an outer wall thereof, and the corresponding second through hole 27 and the corresponding inner wall of the second locking hole 122 have corresponding guide grooves 1221.

Preferably, the lower side of the rotating base 2 is opened toward one side, and the side is connected with the base cover 10, and the upper receiving space 21 and the lower receiving space 22 which are communicated up and down are formed between the lower side of the rotating base 2 and the base cover 10. The first through hole 26 is disposed on the seat cover 10, and the second through hole 27 is disposed on a side wall of the rotary seat 2 away from the seat cover. The arrangement is convenient for assembling the first locking piece 5 and the first spring 7 with the second locking piece 6 and the second spring 8.

In this embodiment, the seat cover 10 includes a plate 101, a first connecting post 102 extending from the plate 101 to one side of the rotary seat 2, and a partition plate 103, the rotary seat 2 is provided with a corresponding second connecting post 28, the first connecting post 102 and the second connecting post 28 are locked by countersunk screws, so as to connect the seat cover 10 and the rotary seat 2, and the partition plate 103 divides the space between the seat cover 10 and the rotary seat 2 into the upper receiving space 21 and the lower receiving space 22 which are communicated with each other.

The first through hole 26 is disposed on the plate body 101. The second spring 8 is disposed between the plate body 101 and the second locking member 6.

As shown in fig. 12 to 17, the stroller of the present invention includes the foldable joint, and further includes a first rod 3 connected to the fixing base 1 at an upper end thereof, a second rod 4 connected to the rotating base 2 at a lower end thereof, and two third rods 13, wherein the upper ends of the two third rods 13 are respectively connected to the two second connecting portions 12, the upper end of the first rod 3 is fixedly connected to the first connecting portion 11, and the upper ends of the two third rods 13 are respectively pivoted to the two second connecting portions 12; or, the upper end of the first rod 3 is pivoted to the first connecting portion 11, and the upper ends of the two third rods 13 are respectively and fixedly connected to the two second connecting portions 12; or, the upper end of the first rod 3 is pivoted to the first connecting portion, and the upper ends of the two third rods 13 are respectively pivoted to the two second connecting portions 12.

The release member 9 is provided with a long hole extending up and down, the rotary base 2 or/and the third rod member 4 is provided with a round hole, and a rivet penetrates through the round hole and the long hole, so that the release member 9 can be connected in the rotary base 2 in a manner of moving up and down relatively.

The outside of the second rod piece 4 is connected with an operating piece (not shown) which can move up and down relatively, the operating piece is connected with the release piece, and the pipe wall of the first rod piece 3 is provided with a corresponding avoidance long hole which extends up and down, namely, a connecting piece (such as a rivet, a screw and the like) is connected with the operating piece and the release piece, the avoidance long hole is used for the connecting piece to pass through, and when the operating piece moves up and down, the avoidance long hole can not hinder the movement of the operating piece. Or, the upper side of the release piece is connected with an operating piece, and one end of the operating piece penetrates through the avoidance long hole and is exposed out of the second rod piece 4.

Move down the operating parts to the drive release piece moves down, thereby orders about

first locking piece

5, 6 reverse movement of second locking piece and break away from respectively with the block of first locking hole 121, second locking hole 122, the locking device unblock, roating seat 2 relatively fixed seat 1 is rotatory, the utility model discloses collapsible joint is collapsible.

That is to say, the foldable joint of the utility model is locked by the upper locking piece and the lower locking piece at the same time, thereby ensuring the stable reliability of the joint in the locking state; and the first locking piece 5 and the second locking piece 6 can be respectively moved reversely to be separated from the corresponding first locking hole 121 and second locking hole 122 by moving the unlocking piece 9 downwards, so that the locking device is unlocked, and the unlocking operation is very simple.

The utility model discloses children's shallow further including but connect in relatively sliding ground slider 14, rear end on the first member 3 with first connecting piece 15, the upper end of 1 pin joint of fixing base with the second connecting piece 16, the rear end of the pin joint of 15 front ends of first connecting piece with the third connecting piece 17 of 13 pin joints of third member, 16 lower extremes of second connecting piece and 17 front ends of third connecting piece all pin joints in slider 14.

After the unblock locking device, backward rotatory second member 4 makes it be close to first member 3 to make first member 3 and third member 13 also relative rotation be close to, thereby third connecting piece 17 front end forces the slider to move down along first member 3, thereby drives first connecting

piece

15, 16 swivelling movements of second connecting piece and is close to first member 3, the utility model discloses children's shallow is folding completely.

In this embodiment, the stroller further includes a push handle bar 18 having a lower end pivotally connected to the upper end of the second rod 4, a second locking device for limiting the relative rotation between the lower side of the push handle bar 18 and the upper side of the second rod 4 is disposed between the lower side of the push handle bar 18 and the upper side of the second rod 4, and the second locking device is configured such that when the second locking device is unlocked, the release member 9 can be driven to move downward by rotating the push handle bar 18. The second locking device may be any known structure, and the structure for rotating the pushing handle bar 18 to drive the releasing element to move downward may also be any known structure, which is not a key point of the present invention, and therefore, is not described herein again.

In this embodiment, a first wheel set 20 is connected to a lower portion of the first rod 3, and a second wheel set 30 is connected to a lower portion of the third rod 13. Preferably, first wheelset sets up to the universal wheel, thereby the utility model discloses when children's shallow is folding, first wheelset can turn to and avoid producing with the second wheelset and interfere to make the second wheelset can be close to first member 3 as far as possible, further reduce folding volume of timber.

The foldable joint can also be used in the field of other infant products such as seats, sleeping boxes and the like which can be converted between an unfolded state and a folded state.

Claims

1. The utility model provides a foldable joint, includes fixing base and the roating seat of mutual pin joint, set up in be used for restricting the locking device of both relative rotations between fixing base and the roating seat, its characterized in that: the fixing base includes first connecting portion, bipartition do not certainly first connecting portion upper end both sides are toward the second connecting portion that outer interval extended, roating seat downside pin joint in two between the second connecting portion, locking device include one side relatively movable connect in first locking piece and second locking piece in the roating seat, set up respectively in two first locking hole and second locking hole on the second connecting portion, set up in first spring between first locking piece and the roating seat, set up in second spring between second locking piece and the roating seat under the effect of first spring and second spring, the opposite side of first locking piece and second locking piece is blocked respectively in first locking hole and second locking hole.

2. The foldable joint of claim 1, wherein: the first locking piece is positioned on the upper side of the second locking piece.

3. The foldable joint of claim 1 or 2, wherein: the lower side of a release piece can be connected in the rotating seat in a relatively up-and-down moving mode, the release piece is matched with the first locking piece and the second locking piece, and the release piece is driven to move downwards to force the first locking piece and the second locking piece to move in opposite directions and to be disengaged from the first locking hole and the second locking hole respectively.

4. The foldable joint of claim 3, wherein: the first locking piece comprises a first body, a first matching part and a first clamping part, wherein the first matching part extends from the first body to the opposite side; the second locking piece comprises a second body, a second matching part and a second clamping part, wherein the second matching part and the second clamping part extend from the second body to the same side; under the action of the first spring and the second spring, the opposite sides of the first clamping part and the second clamping part are clamped into the first locking hole and the second locking hole respectively.

5. The foldable joint of claim 4, wherein: the unlocking piece is provided with a first driving inclined plane and a second driving inclined plane which are vertically spaced, the inclination directions of the first driving inclined plane and the second driving inclined plane are opposite, the first matching part is provided with a first driven inclined plane matched with the first driving inclined plane, the second matching part is provided with a second driven inclined plane matched with the second driving inclined plane, and the inclination directions of the first driving inclined plane and the second driving inclined plane are also opposite.

6. The foldable joint of claim 5, wherein: the first matching part is provided with a through hole which penetrates through the first matching part from top to bottom, and a second driving inclined plane of the unlocking piece downwards penetrates through the through hole of the first matching part and then is matched with the second driven inclined plane.

7. The foldable joint of claim 6, wherein: the upper end face of the first matching part is respectively downwards and obliquely sunken at two sides of the through hole to form two first driven inclined planes, and correspondingly, the two sides of the unlocking part are respectively provided with the first driving inclined planes.

8. The foldable joint of claim 7, wherein: the second matching part is provided with a groove with an upward opening, one side wall of the groove is set to be the second driven inclined plane, and the lower end face of the unlocking piece is set to be the second driving inclined plane.

9. The foldable joint of any one of claims 4 to 8, wherein: the rotary seat is characterized in that an upper accommodating space and a lower accommodating space which are communicated with each other from top to bottom are formed in the lower side of the rotary seat, one side of the first locking piece can be arranged in the upper accommodating space in a relatively movable mode, one side of the second locking piece can be arranged in the lower accommodating space in a relatively movable mode, the first locking piece further comprises a guide post extending from one side of the first body, the guide post is consistent with the extending direction of the first matching portion, and a guide hole is formed in the side wall of the corresponding side of the upper accommodating space and used for the guide post to be inserted in a relatively movable mode.

10. The foldable joint of claim 9, wherein: the rotary seat is characterized in that the lower side of the rotary seat is arranged towards an opening on one side, a seat cover is connected to the side, an upper accommodating space and a lower accommodating space which are communicated with each other are formed between the lower side of the rotary seat and the seat cover, a first through hole is formed in the seat cover, a second through hole is formed in the side wall, away from one side of the seat cover, of the rotary seat, and the opposite sides of the first clamping portion and the second clamping portion penetrate through the first through hole and the second through hole respectively and then are clamped into the first locking hole and the second locking hole.

11. The foldable joint of claim 10, wherein: the seat cover comprises a plate body and a partition plate extending from the plate body to one side of the rotary seat, and the partition plate divides a space between the seat cover and the rotary seat into an upper accommodating space and a lower accommodating space which are communicated with each other.

12. The foldable joint of any one of claims 4 to 8, wherein: the first locking hole and the second locking hole are provided with three spaced locking holes, correspondingly, and the first clamping portion and the second clamping portion are provided with three clamping rods.

13. The foldable joint of claim 12, wherein: the outer wall of at least one of the three clamping rods of the first locking piece is provided with a guide rib in a protruding mode, the inner wall of the first locking hole corresponding to the clamping rod is provided with a guide groove, and when the clamping rod is inserted into the corresponding first locking hole, the guide rib is also inserted into the guide groove; the outer wall of at least one of the three clamping rods of the second locking piece is provided with a guide rib in a protruding mode, and the inner wall of the corresponding second locking hole is also provided with a guide groove.

14. The foldable joint of claim 10 or 11, wherein: the first locking hole and the second locking hole are provided with three spaced locking holes, correspondingly, and the first clamping portion and the second clamping portion are provided with three clamping rods.

15. The foldable joint of claim 14, wherein: the outer wall of at least one of the three clamping rods of the first locking piece is provided with a guide rib in a protruding mode, the inner wall of the first locking hole corresponding to the clamping rod is provided with a guide groove, and when the clamping rod is inserted into the corresponding first locking hole, the guide rib is also inserted into the guide groove; the outer wall of at least one of the three clamping rods of the second locking piece is provided with a guide rib in a protruding mode, and the inner wall of the corresponding second locking hole is also provided with a guide groove.

16. The foldable joint of claim 9, wherein: the side walls of the upper accommodating space and the lower accommodating space on the same side are respectively provided with a first guide accommodating groove and a second guide accommodating groove, and the first matching part and the second matching part can be inserted into the first guide accommodating groove and the second guide accommodating groove in a relatively movable manner.

17. The foldable joint of claim 14, wherein: the side walls of the upper accommodating space and the lower accommodating space on the same side are respectively provided with a first guide accommodating groove and a second guide accommodating groove, and the first matching part and the second matching part can be inserted into the first guide accommodating groove and the second guide accommodating groove in a relatively movable manner.

18. The foldable joint of claim 10 or 11 or 15, wherein: the side walls of the upper accommodating space and the lower accommodating space on the same side are respectively provided with a first guide accommodating groove and a second guide accommodating groove, and the first matching part and the second matching part can be inserted into the first guide accommodating groove and the second guide accommodating groove in a relatively movable manner.

19. A stroller, characterized in that: the foldable joint comprises a first rod piece, a second rod piece and two third rod pieces, wherein the upper end of the first rod piece is connected with the fixed seat, the lower end of the second rod piece is connected with the rotating seat, the upper ends of the two third rod pieces are respectively connected with the two second connecting parts, the upper end of the first rod piece is fixedly connected with the first connecting part, and the upper ends of the two third rod pieces are respectively pivoted with the two second connecting parts; or the upper end of the first rod piece is pivoted with the first connecting part, and the upper ends of the two third rod pieces are respectively and fixedly connected with the two second connecting parts; or the upper end of the first rod piece is pivoted with the first connecting part, and the upper ends of the two third rod pieces are respectively pivoted with the two second connecting parts.