Folding connecting mechanism and trolley

Abstract

The utility model provides a folding connecting mechanism and a trolley, the folding connecting mechanism comprises a connecting seat, a vertical support and a push rod, and the connecting seat is provided with a first connecting part and a second connecting part; the first connecting part and the second connecting part are respectively positioned at different positions of the connecting seat; the vertical bracket is arranged below the connecting seat and is connected to the first connecting part; the push rod is arranged on one side of the connecting seat and is connected to the connecting seat in a swinging manner; connection of multiple positions of the connecting base is achieved, it is guaranteed that the vertical support and the push rod are connected through one connecting base, and meanwhile the push rod is hinged to the second connecting part. When the push rod swings relative to the connecting base, the push rod gets close to the vertical support and is folded with the vertical support in the front-back direction, so that folding of the push rod and the vertical support is completed conveniently, the situation that the push rod cannot be folded is avoided, the folding effect and the space utilization effect of the folding connecting mechanism are guaranteed, and the occupied space of the folding connecting mechanism is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of trolley, especially a folding connecting mechanism and trolley. BACKGROUND

[0002] With the development of science and technology, trolley is widely used in production and life, can work in the place where motor vehicles are inconvenient to use, especially plays a great advantage when short-distance carrying goods, carries goods and saves time and effort, and the folding connecting mechanism is part of the trolley.

[0003] In the prior art, the existing folding connecting mechanism comprises a rack, a connecting seat, a vertical support and a push rod, the connecting seat is connected to the upper side of the rack, the vertical support is connected to the lower side of the rack, and the push rod is connected to the connecting seat, but the push rod cannot be folded, the vertical support and the push rod are connected to different parts, not the same connecting seat, resulting in that the existing folding connecting mechanism occupies a large space. UTILITY MODEL CONTENTS

[0004] The utility model discloses a folding connecting mechanism and trolley, and the connecting seat is equipped with first connecting part, second connecting part, first connecting part, second connecting part is in the different position of connecting seat respectively, vertical support sets up in the below of connecting seat and is connected to first connecting part, push rod sets up in one side of connecting seat and can swing and is connected to connecting seat, realize the connection of multiple positions of connecting seat, guarantee one connecting seat to the connection of vertical support and push rod, simultaneously, push rod articulates in second connecting part, when push rod swing relative to connecting seat, push rod is close to vertical support and is folded along the front and back direction with vertical support, so as to complete the folding of push rod and vertical support, avoid that push rod cannot be folded, guarantee the folding effect and space utilization effect of folding connecting mechanism, reduce the occupied space of folding connecting mechanism.

[0005] To realize the above-mentioned purpose, the utility model provides the following technical scheme:

[0006] A folding connecting mechanism is applied to a trolley, and the folding connecting mechanism comprises:

[0007] A connecting seat is provided with first connecting part and second connecting part, and the first connecting part and the second connecting part are respectively located at different positions of the connecting seat;

[0008] A vertical support is arranged below the connecting seat and connected to the first connecting part;

[0009] A push rod is arranged on one side of the connecting seat and swingably connected to the connecting seat, the push rod is articulated to the second connecting part, and when the push rod swings relative to the connecting seat, the push rod is close to the vertical support and folded along the front and back direction with the vertical support.

[0010] Optionally, the connecting seat is further provided with a fourth connecting part;

[0011] The folding connecting mechanism further comprises a top support which is connected to the fourth connecting part in a liftable manner.

[0012] Optionally, the top support comprises a support body, a plurality of support arms and a connecting frame;

[0013] The support body is connected to the fourth connecting part in a liftable manner;

[0014] The plurality of support arms are between the support body and the connecting frame, one end of each support arm is rotatably sleeved on the support body, and the other end is hingedly connected to the connecting frame.

[0015] Optionally, the connecting seat is further provided with a clamping piece capable of moving laterally, and a clamping hole is formed through the clamping piece;

[0016] The fourth connecting part is provided with a through hole;

[0017] The top support is arranged in the through hole and the clamping hole, and the upper end and the lower end of the top support are respectively provided with buckling pieces which can be clamped by the side wall of the clamping hole when the clamping piece moves laterally towards the outside of the connecting seat, so as to maintain the height position of the top support.

[0018] Optionally, an elastic piece is arranged between the clamping piece and the connecting seat, and the elastic piece applies an elastic force to the clamping piece, so that the clamping piece elastically clamps the outer side wall of the top support under the elastic force;

[0019] The outer end of the clamping piece is arranged as an operation end which is outside the connecting seat and is operated by a user, and the side wall of the fourth connecting part is provided with a mounting channel which communicates with the through hole, and the inner end of the clamping piece is assembled in the fourth connecting part through the mounting channel.

[0020] Optionally, the push rod comprises a rotating part and a push rod body; the push rod body is connected to the rotating part;

[0021] The rotating part is arranged relative to the second connecting part and is rotatably connected to the second connecting part;

[0022] A movement space is formed between the rotating part and the second connecting part;

[0023] A gear is arranged between the rotating part and the second connecting part, the gear moves in the movement space and engages the rotating part or the second connecting part.

[0024] Optionally, the connecting seat is further provided with a third connecting part, and the third connecting part, the first connecting part and the second connecting part are respectively located at different positions of the connecting seat.

[0025] The folding connecting mechanism further comprises a transverse support, and the transverse support connects the third connecting part along a horizontal direction.

[0026] The utility model further provides a handcart which comprises the folding connecting mechanism.

[0027] Optionally, the vertical supports are multiple, and adjacent two vertical supports are folded along a front-rear direction.

[0028] Adjacent two vertical supports are provided with a scissor type folding piece, and the scissor type folding piece is folded or unfolded along the front-rear direction.

[0029] The scissor type folding piece comprises at least two groups of cross rods which are arranged in cross and are hingedly connected, and a telescopic rod group arranged along a vertical direction is connected between adjacent two cross rod groups.

[0030] The telescopic rod group comprises an upper telescopic rod and a lower telescopic rod telescopically sleeved with the upper telescopic rod, and the upper ends of adjacent two cross rod groups are hingedly connected with the upper end of the upper telescopic rod through a first connecting piece, and the lower ends of adjacent two cross rod groups are hingedly connected with the lower end of the lower telescopic rod through a second connecting piece.

[0031] Optionally, the folding connecting mechanism is arranged at the upper part or the lower part of the vertical support.

[0032] Further comprising a first folding bottom frame connected between the lower parts of the vertical supports and a second folding bottom frame connected between the middle parts of the vertical supports and the second connecting pieces.

[0033] Compared with the prior art, the utility model has the beneficial effects that:

[0034] The utility model provides a folding connecting mechanism and handcart, connecting seat is provided with first connecting part, second connecting part, first connecting part, second connecting part is respectively located at different positions of connecting seat, vertical support sets up in the lower of connecting seat, and is connected to first connecting part, push rod sets up in one side of connecting seat, and can swing ground connection in connecting seat, realized the connection of multiple positions of connecting seat, ensured that one connecting seat connects vertical support and push rod, simultaneously, push rod is hinged to second connecting part, when push rod swings relative to connecting seat, push rod is close to vertical support, and is folded along front-rear direction with vertical support, in order to complete the folding of push rod and vertical support, avoids that push rod cannot fold, ensures the folding effect and space utilization effect of folding connecting mechanism, reduces the occupied space of folding connecting mechanism. BRIEF DESCRIPTION OF DRAWINGS

[0035] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments description will be briefly introduced. Obviously, the drawings in the following description only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained without creative labor on the basis of these drawings.

[0036] In order to more completely understand the present application and its beneficial effects, the following will be described in conjunction with the drawings. In the following description, the same reference numbers represent the same parts.

[0037] Figure 1 A schematic view of the folding connecting mechanism according to the present application is shown.

[0038] Figure 2 An exploded view of the folding connecting mechanism according to the present application is shown.

[0039] Figure 3 A schematic view of the connection between the connecting seat and the push rod of the folding connecting mechanism according to the present application is shown.

[0040] Figure 4 An exploded view of the connection between the connecting seat and the push rod of the folding connecting mechanism according to the present application is shown.

[0041] Figure 5 A sectional view of the top support, the connecting seat and the vertical support of the folding connecting mechanism according to the present application is shown.

[0042] Figure 6 A schematic view of Figure 5 A local enlarged view of A in FIG. 8.

[0043] Figure 7 A folding state view of the folding connecting mechanism according to the present application is shown.

[0044] Figure 8 A schematic view of the double-layer chassis assembly of the folding connecting mechanism according to the present application is shown.

[0045] Reference signs

[0046] 100, folding connecting mechanism;

[0047] 10, connecting seat; 11, first connecting part; 12, second connecting part; 12a, moving space; 13, third connecting part; 14, fourth connecting part; 14a, via hole; 15, clamping part; 151, operation end; 16, elastic part;

[0048] 20, vertical support; 20a, through hole; 21, chassis assembly; 211, chassis; 22, scissor folding part;

[0049] 30, push rod; 31, rotating part; 311, gear; 312, moving block; 32, push rod body; 321, key

[0050] 40, transverse support

[0051] 50, top support; 51, support body; 52, support arm; 53, connecting frame

[0052] 60, roller DETAILED DESCRIPTION

[0053] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0054] Please refer to the drawings in the embodiments of the present application Figures 1-2 The utility model provides a folding connecting mechanism 100, folding connecting mechanism 100 is applied to handcart, folding connecting mechanism 100 is used to fold push rod 30.

[0055] Please refer to the drawings in the embodiments of the present application Figures 1-5 In the embodiments of the present application, the folding connecting mechanism 100 includes a connecting seat 10, a vertical support 20 and a push rod 30, the connecting seat 10 is provided with a first connecting part 11 and a second connecting part 12; the first connecting part 11 and the second connecting part 12 are respectively located at different positions of the connecting seat 10; the vertical support 20 is arranged below the connecting seat 10 and connected to the first connecting part 11; the push rod 30 is arranged on one side of the connecting seat 10 and swingably connected to the connecting seat 10; the connection of multiple positions of the connecting seat 10 is realized, the connection of the vertical support 20 and the push rod 30 by one connecting seat 10 is ensured, at the same time, the push rod 30 is hinged to the second connecting part 12; when the push rod 30 swings relative to the connecting seat 10, the push rod 30 approaches the vertical support 20 and is folded with the vertical support 20 in the front-back direction, so as to complete the folding of the push rod 30 and the vertical support 20, avoid the failure of folding of the push rod 30, ensure the folding effect and space utilization effect of the folding connecting mechanism 100, and reduce the occupied space of the folding connecting mechanism 100.

[0056] Please refer to the drawings in the embodiments of the present application Figures 1-2 In the embodiments of the present application, the connecting seat 10 is provided with a first connecting part 11 and a second connecting part 12; the first connecting part 11 and the second connecting part 12 are respectively located at different positions of the connecting seat 10, the first connecting part 11 is used for connecting the vertical support 20, and the second connecting part 12 is used for connecting the push rod 30, so as to make the vertical support 20 and the push rod 30 approach different directions.

[0057] Please refer to the accompanying drawings Figures 1-2 In the embodiment of the present application, the vertical support 20 is arranged below the connecting seat 10 and connected to the first connecting part 11, so that the vertical support 20 is fixed to the first connecting part 11, thereby facilitating the vertical support 20 to be connected to the connecting seat 10 through the first connecting part 11.

[0058] Please refer to the accompanying drawings Figures 1-2 In the embodiment of the present application, the push rod 30 is arranged at the front side of the connecting seat 10 and swingably connected to the connecting seat 10, so as to adjust the position of the push rod 30 relative to the connecting seat 10; the connection of the connecting seat 10 at multiple positions is realized, and the connection of the vertical support 20 and the push rod 30 by one connecting seat 10 is ensured, and at the same time, the push rod 30 is hinged to the second connecting part 12; when the push rod 30 swings relative to the connecting seat 10, the push rod 30 approaches the vertical support 20 and is folded along the front and rear directions with the vertical support 20, so as to complete the folding of the push rod 30 and the vertical support 20, avoid the failure of folding of the push rod 30, ensure the folding effect and space utilization effect of the folding connection mechanism 100, and reduce the occupied space of the folding connection mechanism 100.

[0059] Please refer to the accompanying drawings Figures 3-4 The push rod 30 comprises a rotating part 31 and a push rod body 32; the push rod body 32 is connected to the rotating part 31; the rotating part 31 is arranged relative to the second connecting part 12 and swingably connected to the second connecting part 12, so as to adjust the position of the rotating part 31 relative to the second connecting part 12, thereby facilitating the rotating part 31 to rotate with the push rod body 32, and further facilitating the push rod 30 to swing relative to the second connecting part 12 through the rotating part 31.

[0060] Please refer to the accompanying drawings Figures 3-4 A moving space 12a is formed between the rotating part 31 and the second connecting part 12; a gear 311 is arranged between the rotating part 31 and the second connecting part 12, and moves in the moving space 12a, so as to adjust the position of the gear 311 relative to the moving space 12a; the gear 311 engages the rotating part 31 or the second connecting part 12, at this time, the gear 311 is connected to the rotating part 31 and engages the second connecting part 12, so as to lock the second connecting part 12 by the rotating part 31 through the gear 311, thereby facilitating the push rod 30 to be in a stationary state relative to the connecting seat 10.

[0061] Please refer to the accompanying drawings Figures 3-4The moving block 312 is arranged between the rotating part 31 and the second connecting part 12, is arranged in the moving space 12a, is movably connected to the moving space 12a, and is used for adjusting the position of the moving block 312 relative to the moving space 12a. The moving block 312 drives the movement of the gear 311, so that the gear 311 moves with the movement of the moving block 312, thereby facilitating the gear 311 to disengage or engage the second connecting part 12.

[0062] Please refer to the accompanying drawings Figures 3-4 The push rod body 32 is connected with the button 321, the button 321 is telescopically connected to the push rod body 32, and is used for adjusting the position of the button 321 relative to the push rod body 32. The button 321 drives the movement of the moving block 312 through the pull wire, so that the moving block 312 moves with the extension and retraction of the button 321, thereby facilitating the user to realize the disengagement of the gear 311 from the second connecting part 12 by controlling the button 321, and facilitating the push rod body 32 to swing relative to the connecting seat 10.

[0063] Please refer to the accompanying drawings Figures 3-4 The pull wire is arranged in the push rod body 32 and passes through the moving space 12a. The two ends of the pull wire are respectively connected to the button 321 and the moving block 312, so that the button 321 drives the movement of the moving block 312 through the pull wire.

[0064] Please refer to the accompanying drawings Figures 3-4 The connecting seat 10 is further provided with a third connecting part 13. The third connecting part 13, the first connecting part 11 and the second connecting part 12 are respectively arranged at different positions of the connecting seat 10. The folding connecting mechanism 100 further comprises a horizontal support 40. The horizontal support 40 is connected to the third connecting part 13 along the horizontal direction, so that the horizontal support 40 is connected to the connecting seat 10 through the third connecting part 13, thereby facilitating the horizontal support 40, the vertical support 20 and the push rod 30 to face different directions, realizing the connection of multiple positions of the connecting seat 10, and ensuring the connection of the vertical support 20, the push rod 30 and the horizontal support 40 to one connecting seat 10.

[0065] Please refer to the accompanying drawings Figures 1-2 Fig. 5 and Fig. 6, the connecting seat 10 is further provided with a fourth connecting part 14. The folding connecting mechanism 100 further comprises a top support 50. The top support 50 is telescopically connected to the fourth connecting part 14, so as to adjust the position of the top support 50 relative to the fourth connecting part 14, thereby facilitating the top support 50 to realize the lifting relative to the connecting seat 10 through the fourth connecting part 14, so as to adjust the height position of the top support 50 relative to the connecting seat 10.

[0066] Please refer to the accompanying drawings Figures 1-2The top support 50 comprises a support body 51, a plurality of support arms 52 and a connecting frame 53. The support body 51 is connected to the fourth connecting portion 14 in a lifting manner, so as to adjust the height position of the support body 51 relative to the fourth connecting portion 14, thereby facilitating the lifting of the top support 50 relative to the fourth connecting portion 14 through the support body 51. The plurality of support arms 52 are arranged between the support body 51 and the connecting frame 53. One end of each support arm 52 is rotatably sleeved on the support body 51, so as to adjust the position of the support arm 52 relative to the support body 51, thereby facilitating the folding or unfolding of the support arm 52 relative to the support body 51. The other end of each support arm 52 is hingedly connected to the connecting frame 53, so as to adjust the position of the support arm 52 relative to the connecting frame 53, thereby facilitating the folding of the plurality of support arms 52 downwardly by the connecting frame 53, so as to realize the folding effect of the plurality of support arms 52.

[0067] Please refer to the accompanying drawings Figures 1-2 Figs. 5 and 6, the connecting base 10 is further provided with a clamping piece 15 capable of moving laterally, and a clamping hole is formed through the clamping piece 15. The fourth connecting portion 14 is provided with a through hole 14a. The top support 50 is arranged in the through hole 14a and the clamping hole, so as to facilitate the lifting of the top support 50 relative to the fourth connecting portion 14 through the space of the through hole 14a. The upper and lower ends of the top support 50 are respectively provided with a clamping piece. When the clamping piece moves laterally outwardly along the connecting base, the clamping piece is clamped by the side wall of the clamping hole, so as to maintain the height position of the top support 50, thereby facilitating the clamping piece 15 to limit the position of the top support 50 relative to the fourth connecting portion 14. When the clamping piece 15 is separated from the top support 50, the top support 50 can be adjusted in the lifting manner relative to the through hole 14a.

[0068] Please refer to the accompanying drawings Figures 1-2 Figs. 5 and 6, a resilient piece 16 is arranged between the clamping piece 15 and the connecting base 10. The resilient piece 16 applies an elastic force to the clamping piece 15, so that the clamping piece 15 elastically clamps the outer side wall of the top support 50 under the elastic force, thereby facilitating the clamping piece 15 to clamp the outer side wall of the top support 50 through the resilient piece 16. When the clamping piece 15 compresses the resilient piece 16 under an external force, the clamping piece 15 is separated from the outer side wall of the top support 50, so as to realize the lifting adjustment of the top support 50 relative to the through hole 14a.

[0069] Please refer to the accompanying drawings Figures 5-6The outer end of the engaging member 15 is provided with an operating end 151, which is located outside the connecting seat 10 and is operated by a user to press the engaging member 15 through the operating end 151 so as to engage or disengage the engaging member 15 with the top support 50, and the top support 50 has an optional folding effect. The side wall of the fourth connecting part 14 is provided with a mounting passage 14a, and the inner end of the engaging member 15 is assembled in the fourth connecting part 14 through the mounting passage, and the outer end of the mounting passage is provided with an inclined guide surface for guiding the engaging member 15 to extend into the fourth connecting part 14, thereby facilitating assembly.

[0070] Please refer to the accompanying drawings Figures 5-6 The vertical support 20 is provided with a through hole 20a as an internal space of the vertical support 20, which is communicated with the through hole 14a, so that the top support 50 enters the through hole 20a through the through hole 14a, thereby facilitating the top support 50 to be accommodated in the vertical support 20 through the through hole 20a, and further facilitating the top support 50 to fully utilize the internal space of the vertical support 20.

[0071] In another embodiment, a handcart is also provided, which comprises the above-mentioned folding connecting mechanism 100 as a part of the handcart, and the handcart is used for carrying goods to save time and labor.

[0072] Please refer to the accompanying drawings Figures 3-4 The vertical support 20 has a plurality of vertical supports 20, and adjacent two vertical supports 20 are folded along the front-back direction to reduce the space area between the plurality of vertical supports 20, and a scissor-type folding member 22 is arranged between the adjacent two vertical supports 20, and the two ends of the scissor-type folding member 22 are connected to the adjacent two vertical supports 20, respectively, and the scissor-type folding member 22 is folded or unfolded along the front-back direction to fold or unfold the adjacent two vertical supports 20 through the scissor-type folding member 22. The scissor-type folding member 22 comprises at least two groups of cross rods arranged in cross and hinged to each other, and a telescopic rod group arranged in the vertical direction is connected between the adjacent two cross rod groups, and the telescopic rod group comprises an upper telescopic rod and a lower telescopic rod telescopically sleeved with the upper telescopic rod, and the upper ends of the adjacent two cross rod groups are hinged to the upper end of the upper telescopic rod through a first connecting member, respectively, and the lower ends of the adjacent two cross rod groups are hinged to the lower end of the lower telescopic rod through a second connecting member, respectively. The upper telescopic rod can telescopically move relative to the lower telescopic rod with the folding or unfolding of the cross rod group.

[0073] Please refer to the accompanying drawings Figures 1-2, two adjacent vertical supports 20 are provided with a chassis assembly 21, the chassis assembly 21 comprises two chassis 211, the two chassis 211 are hinged to each other so as to adjust the position of the two chassis 211, the two chassis 211 can be folded, the folding effect and the space utilization effect of the two chassis 211 are guaranteed, when the two chassis 211 are in an unfolded state; the two chassis 211 are connected to the plurality of vertical supports 20 respectively, so that the two chassis 211 are connected to the connecting seat 10 through the plurality of vertical supports 20.

[0074] Please refer to the accompanying drawings Figure 8 In another embodiment, a folding connecting mechanism is arranged at the upper part of the vertical support 20, and in other embodiments, the folding connecting mechanism can also be connected to the lower part of the vertical support 20. The chassis assembly 21 has a plurality of chassis assemblies 22 arranged in the up-down direction and spaced apart from each other, including a first folding chassis connected between the lower parts of the vertical supports 20, and a second folding chassis connected between the middle parts of the vertical supports 20 and the second connecting members. By arranging a plurality of chassis assemblies 21, the placing area of the chassis assembly 21 for articles is increased, and when the chassis assembly 21 has two, a double-layer chassis assembly 21 is realized.

[0075] Please refer to the accompanying drawings Figure 1 The trolley further comprises a plurality of rollers 60, the plurality of rollers 60 are enclosed to form a square, and the plurality of rollers 60 are connected to the bottom layer chassis assembly 21 and roll relative to the ground, so that the bottom layer chassis assembly 21 moves relative to the ground through the plurality of rollers 60, and the transfer convenience of the folding connecting mechanism 100 is improved.

[0076] Compared with the prior art, the folding connecting mechanism 100 and the trolley have the following beneficial effects:

[0077] The folding connecting mechanism 100 and the trolley have the following beneficial effects:

[0078] In the above-described embodiments, the description of each embodiment focuses on different aspects, and the parts not described in detail in a certain embodiment can be referred to the relevant description of other embodiments.

[0079] In the description of the present application, the terms "first", "second" are only for descriptive purpose, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more features.

[0080] The principles and implementation modes of the present application are described herein by applying specific examples, and the above description of the embodiments is only for helping to understand the method of the present application and its core idea; meanwhile, for those skilled in the art, according to the idea of the present application, the specific implementation modes and application ranges will have changes, and in summary, the content of the specification should not be understood as limiting the present application.

Claims

1. A folding connection mechanism, characterized by The folding connecting mechanism is applied to a trolley and comprises: a connecting seat provided with a first connecting part and a second connecting part; a vertical support arranged below the connecting seat and connected to the first connecting part; a push rod arranged on one side of the connecting seat and swingably connected to the connecting seat; the push rod is hinged to the second connecting part; when the push rod swings relative to the connecting seat, the push rod approaches the vertical support and is folded along the front-back direction with the vertical support.

2. The folding connection mechanism of claim 1, wherein, The connecting seat is further provided with a fourth connecting part; The folding connecting mechanism further comprises a top support which is connected to the fourth connecting part in a lifting manner.

3. The folding connection mechanism of claim 2, wherein, The top support comprises a support body, a plurality of support arms and a connecting frame; The support body is connected to the fourth connecting part in a lifting manner; The plurality of support arms are arranged between the support body and the connecting frame; one end of each support arm is rotatably sleeved to the support body, and the other end is hinged to the connecting frame.

4. The fold connection of claim 2, wherein, The connecting seat is further provided with a clamping piece capable of moving in a transverse direction; a clamping hole is arranged through the clamping piece; The fourth connecting part is provided with a through hole; The top support is arranged in the through hole and the clamping hole; the upper and lower ends of the top support are respectively provided with buckling pieces; when the clamping piece moves in the transverse direction to the outside of the connecting seat, the buckling pieces are clamped by the side wall of the clamping hole to maintain the height position of the top support.

5. The fold connection mechanism of claim 4, wherein, An elastic piece is arranged between the clamping piece and the connecting seat; the elastic piece applies an elastic force to the clamping piece, so that the clamping piece elastically clamps the outer side wall of the top support under the elastic force; An outer end of the clamping piece is arranged as an operation end which is located outside the connecting seat and is operated by a user; a side wall of the fourth connecting part is provided with a mounting channel which communicates with the through hole; an inner end of the clamping piece is assembled in the fourth connecting part through the mounting channel.

6. The fold connection mechanism according to any one of claims 1-5, wherein, The push rod comprises a rotating part and a push rod body; the push rod body is connected to the rotating part; The rotating part is arranged relative to the second connecting part and is rotatably connected to the second connecting part; A moving space is formed between the rotating part and the second connecting part; A gear is arranged between the rotating part and the second connecting part; the gear moves in the moving space and engages the rotating part or the second connecting part.

7. The fold connection mechanism according to any one of claims 1-5, wherein The connecting seat is further provided with a third connecting part; the third connecting part, the first connecting part and the second connecting part are respectively arranged at different positions of the connecting seat; The folding connecting mechanism further comprises a horizontal support which connects the third connecting part along the horizontal direction.

8. A trolley characterised by, The folding connecting mechanism comprises the folding connecting mechanism according to any one of claims 1 to 7.

9. The cart of claim 8, wherein, The vertical supports are provided in plurality; two adjacent vertical supports are folded along the front-back direction; A scissor-type folding piece is arranged between the two adjacent vertical supports and is folded or unfolded along the front-back direction. The scissors-type folding piece comprises at least two groups of cross rod groups arranged in cross and hinged to each other, and a telescopic rod group arranged in vertical direction is connected between the two adjacent cross rod groups; The telescopic rod group comprises an upper telescopic rod and a lower telescopic rod telescopically sleeved with the upper telescopic rod, the upper ends of the two adjacent cross rod groups are respectively hinged to the upper end of the upper telescopic rod through a first connecting piece, and the lower ends of the two adjacent cross rod groups are respectively hinged to the lower end of the lower telescopic rod through a second connecting piece.

10. The cart of claim 9, wherein, The folding connecting mechanism is arranged at the upper part or the lower part of the vertical support; The folding device further comprises a first folding bottom frame connected between the lower parts of the vertical supports and a second folding bottom frame connected between the middle parts of the vertical supports and the second connecting pieces.

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