Frameless flat folding cart chassis assembly

Abstract

The utility model discloses an underframe assembly of a frameless flat folding trolley, and belongs to the technical field of trolleys. The device mainly comprises four groups of vertical rods, wherein the four groups of vertical rods comprise front vertical rods and rear vertical rods; the bottom sleeve is mounted at the bottom end of the vertical rod; the first cross rod and the second cross rod are mounted between the bottom sleeves; the first fixing ring is mounted at the bottom end of the front vertical rod; the second fixing ring is mounted at the bottom end of the rear vertical rod; the first vertical rod is rotationally arranged, and the second vertical rod is rotationally arranged; the hinge sleeve is mounted on the second vertical rod and hinged to the first vertical rod; the first rotating ring and the second rotating ring are mounted on the vertical rod; the first inclined rod is mounted on the first rotating ring; the second inclined rod is mounted on the second rotating ring; and the folding assembly is used for supporting the bottom of the cart. According to the chassis assembly of the frameless flat folding trolley, the folding assembly is arranged, so that the whole trolley does not rise in the folding process of the trolley, and the trolley storage difficulty is further reduced.

Description

Technical Field

[0001] The present application relates to the technical field of trolleys, and in particular to a frameless flat-folding trolley chassis assembly. Background Art

[0002] A handcart is a transport vehicle that is pushed and pulled by manpower. It is the ancestor of all vehicles. Although the material handling technology of handcarts is constantly developing, handcarts are still used as an indispensable transport tool. Handcarts are widely used in production and life because they are low-cost, simple to maintain, easy to operate, and light in weight. They can work in places where motor vehicles are inconvenient to use and are very convenient for transporting light items over short distances.

[0003] For example, the patent publication number CN115583274 A specifically discloses a foldable trolley that can be gathered and stored. This patent uses a Y-shaped folding assembly of the front and rear walls, foldable side walls, and a foldable bottom frame, so that multiple surfaces can be gathered and stored, achieving a high volume after storage, a smaller volume, and thus facilitating the storage box of the trolley.

[0004] During the implementation of the above patent, although the trolley can be folded to reduce the space occupied, the overall height of the trolley in the above patent will be higher when folded than when unfolded, so that the trolley will occupy more space in the height direction after folding. Therefore, it is necessary to provide a frameless flat-folding trolley chassis assembly to solve the above problem.

[0005] It should be noted that the above information disclosed in this Background section is only for understanding the background technology of the present application concept, and therefore, it may contain information that does not constitute prior art. Summary of the Invention

[0006] Based on the above problems existing in the prior art, the problem to be solved by the present application is: to provide a frameless flat-folding trolley chassis assembly, which solves the problem of increased height of the trolley after folding.

[0007] The technical solution adopted by the present application to solve its technical problems is as follows: a frameless flat-foldable trolley chassis assembly, including four groups of vertical rods as supports, the four groups of vertical rods are divided into two groups of front vertical rods and two groups of rear vertical rods, a bottom sleeve installed at the bottom end of the vertical rods, a first cross bar and a second cross bar installed between the bottom sleeves; a first fixing ring installed at the bottom end of the front vertical rod and a second fixing ring installed at the bottom end of the rear vertical rod; a first vertical rod rotatably arranged on the first fixing ring, and a second vertical rod rotatably arranged on the second fixing ring; a hinge sleeve installed on the second vertical rod, the hinge sleeve is hinged to the first vertical rod; a first rotating ring installed on the front vertical rod, and a second rotating ring installed on the rear vertical rod; a first inclined rod installed on the first rotating ring, and a second inclined rod installed on the second rotating ring; a wheel mechanism for driving the trolley to move; a traction mechanism for the staff to hold; and a folding assembly for supporting the bottom of the trolley in the unfolded state of the trolley, the folding assembly includes: a lower ring sleeve fixedly installed on the first inclined rod and the second inclined rod, an upper rotating shaft is rotatably arranged on the lower ring sleeve, a connecting rod is installed between the two upper rotating shafts, two transition sleeves are arranged on the connecting rod, and a second opening is arranged at the upper end of the transition sleeve.

[0008] Further, an extension mechanism is arranged at the upper end of the vertical rod, the extension mechanism includes an extension block inserted at the upper outer side of the vertical rod, an elliptical groove is arranged in the vertical rod in a penetrating manner, a transition rod is slidably arranged inside the elliptical groove, and an extension rod is installed inside the transition rod; a spring is installed between the bottom of the transition rod and the elliptical groove, a limiting step is arranged at the inner bottom end of the extension block, the limiting step divides the inner part of the extension block into a first section located at the lower end and a second section located at the upper end, wherein the size of the first section matches that of the transition rod, and the size of the second section is smaller than that of the transition rod; a convex platform is arranged at the bottom of the transition rod, and a slideway matched with the convex platform is arranged at the first section of the extension block.

[0009] Further, a horizontal through groove is arranged at the upper end of the extension block, a limiting block is slidably arranged in the through groove, the outer end of the limiting block extending out of the vertical rod forms a button, an elastic part is installed between the limiting block and the vertical rod, and a limiting groove is arranged on the limiting block; a square platform is arranged at the upper end of the extension rod.

[0010] Further, the wheel mechanism includes a wheel frame detachably installed at the lower end of the front vertical rod, a front wheel is rotatably arranged on the wheel frame, a connecting seat is detachably installed at the lower end of the rear vertical rod, and a rear wheel is rotatably installed on the connecting seat; a connecting shaft is rotatably connected between the two connecting seats, and a foot brake is arranged on the connecting shaft.

[0011] Further, a traction mechanism is provided on the first cross bar. The traction mechanism includes a fixed seat installed on the first cross bar, and a bottom draw bar is rotatably provided on the fixed seat; a sliding cavity is formed in the bottom draw bar, and a top draw bar is slidably installed in the sliding cavity. A handle is installed at the top end of the top draw bar; a draw sleeve is sleeved and installed on the bottom draw bar, and a locking portion is provided on the draw sleeve.

[0012] Further, a protective sleeve is provided at the lower end of the vertical rod. A second arc groove is provided at the upper end of the protective sleeve, and a horizontal first arc groove is provided at the lower end of the protective sleeve.

[0013] Further, a connection end is provided at the top end of the extension rod, and a ceiling mechanism is provided at the top of the connection end. The ceiling mechanism includes a top sleeve detachably sleeved on the connection end, a rotating sleeve is rotatably provided on the top sleeve, and a top rod is inserted into the rotating sleeve.

[0014] Further, a plug is commonly connected at the positions of the four groups of top rods away from the rotating sleeve. A plug sleeve is rotatably connected to the plug, and the plug sleeve is connected to the position of the top rod away from the rotating sleeve.

[0015] Further, a supporting mechanism is installed at the top end of the rear vertical rod. The supporting mechanism includes a female ring installed on the extension block. A plurality of groups of card slots are provided on the female ring along the circumferential direction, and a male ring is provided on one side of the female ring;

[0016] An insertion rod is provided on the male ring, and a jack cooperating with the insertion rod is provided on the female ring;

[0017] An extension sleeve is provided on the male ring, a bent rod is inserted into the extension sleeve, and a handrail is sleeved between the two bent rods.

[0018] The bottom frame assembly of the borderless flat-fold trolley provided by the present application has the following beneficial effects:

[0019] 1. By providing a folding assembly, the trolley is suitable for being in an unfolded and folded state, and has a smaller volume during folding, thereby facilitating the storage of the trolley. Moreover, during the folding process of the trolley, the overall height of the trolley does not increase, further reducing the difficulty of storing the trolley.

[0020] 2. By providing an extension mechanism, the top end of the trolley can be extended and expanded, and a ceiling mechanism is installed to protect the trolley.

[0021] 3. By providing a supporting mechanism, the staff can manually support the trolley, so that when carrying heavy goods, multiple people can operate together, reducing the difficulty of carrying the goods.

[0022] In addition to the purposes, features and advantages described above, the present application has other purposes, features and advantages. The following will further elaborate on the present application with reference to the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings forming a part of this application are used to provide a further understanding of the application. The schematic embodiments of the application and their descriptions are used to explain the application and do not unduly limit the application.

[0024] In the drawings:

[0025] Figure 1 is the overall schematic diagram of a frameless flat-fold cart chassis assembly in the present application Figure 1 ;

[0026] Figure 2 is the overall schematic diagram of a frameless flat-fold cart chassis assembly in the present application Figure 2 ;

[0027] Figure 3 is Figure 2 the exploded schematic diagram of the overall structure in

[0028] Figure 4 is Figure 1 the partial structure schematic diagram at A in

[0029] Figure 5 is Figure 2 the partial structure schematic diagram at B in

[0030] Figure 6 is Figure 3 the partial structure schematic diagram at C in

[0031] Figure 7 is Figure 3 the partial structure schematic diagram at D in

[0032] Figure 8 is Figure 3 the partial structure schematic diagram at E in

[0033] Figure 9 is Figure 3 the partial structure schematic diagram at F in

[0034] Figure 10 is Figure 3 the partial structure schematic diagram at G in

[0035] Among them, the reference numerals in the drawings:

[0036] 1. Frame mechanism; 11. Vertical rod; 12. First vertical rod; 13. Second vertical rod; 14. Hinge sleeve; 15. First crossbar; 16. Side crossbar; 17. Neutral vertical rod; 18. Middle crossbar; 19. Protective sleeve; 191. First arc groove; 192. Second arc groove; 110. First diagonal rod; 111. Second diagonal rod; 112. Upper sleeve; 113. Lower sleeve; 114. Upper rod; 115. Lower rod; 116. Central axis; 117. Clamping sleeve; 118. Lower ring sleeve; 119. Upper rotating shaft; 120. Connecting rod; 121. Transition sleeve; 123. Bottom sleeve; 124. Fixed ring; 125. Rotating ring; 126. Second crossbar;

[0037] 2. Extension mechanism; 21. Extension rod; 211. Square platform; 212. Connection end; 22. Extension block; 221. Through slot; 23. Female ring; 231. Card slot; 24. Limiting block; 241. Button; 242. Limiting groove; 25. Transition rod; 251. Notch; 252. Boss; 26. Spring; 27. Cover plate; 28. Male ring; 281. Card teeth; 282. Extension sleeve; 283. Insert rod;

[0038] 3. Wheel mechanism; 31. Front wheel; 32. Rear wheel; 33. Wheel frame; 34. Connection seat; 35. Foot brake; 36. Connection shaft;

[0039] 4. Towing mechanism; 41. Bottom drawbar; 42. Top drawbar; 43. Handle; 44. Pulling sleeve; 45. Locking part; 46. Fixed seat;

[0040] 5. Support mechanism; 51. Bent rod; 52. Armrest;

[0041] 6. Roof mechanism; 61. Top rod; 62. Insert block; 63. Top sleeve; 64. Rotating sleeve; 65. Insert sleeve. Detailed implementation mode

[0042] It should be noted that, without conflict, the embodiments in this application and the features in the embodiments can be combined with each other. The following will detail this application with reference to the drawings and in combination with the embodiments.

[0043] To enable those skilled in the art to better understand the solution of this application, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are only part of the embodiments of this application, rather than all the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of this application.

[0044] Embodiment 1:

[0045] This embodiment elaborates on the structure and folding principle of the handcart. Specifically:

[0046] As shown Figure 1 in the figure, the present application provides a frameless flat-fold trolley chassis assembly, including a frame mechanism 1. The frame mechanism 1 is the main part of the trolley and is used to carry goods. The frame mechanism 1 includes four groups of vertical rods 11. For the convenience of description, taking the view in Figure 1 as an example, along the advancing direction of the trolley, the two groups of vertical rods 11 on the left are defined as front vertical rods, and the two groups of vertical rods 11 on the right are defined as rear vertical rods;

[0047] As Figures 1 - 3 and Figure 6 shown, bottom sleeves 123 are fixedly installed at the bottom ends of the four groups of vertical rods 11. A first cross bar 15 is fixedly installed between the two bottom sleeves 123 on the front vertical rods, and a second cross bar 126 is fixedly installed between the two bottom sleeves 123 on the rear vertical rods. Thus, the two front vertical rods are connected by the first cross bar 15, and the two rear vertical rods are connected by the second cross bar 126 to form a stable whole;

[0048] Meanwhile, fixing rings 124 are fixedly arranged at the bottom ends of the two groups of front vertical rods and the bottom ends of the two groups of rear vertical rods. For the convenience of description, the fixing ring 124 connected to the front vertical rod is defined as the first fixing ring, and the fixing ring 124 connected to the rear vertical rod is defined as the second fixing ring;

[0049] And a first vertical rod 12 is rotatably arranged on the first fixing ring, so that the first vertical rod 12 can rotate around the first fixing ring in the vertical direction. Meanwhile, a second vertical rod 13 is rotatably arranged on the second fixing ring, so that the second vertical rod 13 can rotate around the second fixing ring in the vertical direction;

[0050] Continuing to refer to Figures 1 - 3 and Figure 6 , a hinge sleeve 14 is installed at a position of the second vertical rod 13 far from the second fixing ring. The hinge sleeve 14 is hinged to one end of the first vertical rod 12 far from the first fixing ring. Thus, the first vertical rod 12 and the second vertical rod 13 can rotate relative to each other and are both in a horizontal state to make the trolley in an unfolded state, and are both in a vertical state to make the trolley in a stored state;

[0051] As Figure 1 - Figure 2 shown, side cross bars 16 and middle cross bars 18 are fixedly installed between the two groups of first vertical rods 12 and the two groups of second vertical rods 13. The side cross bars 16 are located close to the vertical rods 11, and the middle cross bars 18 are located close to the hinge sleeves 14. Thus, the two groups of vertical rods can be kept stable through the side cross bars 16 and the middle cross bars 18;

[0052] Meanwhile, two sets of neutral poles 17 are fixedly installed between the side crossbars 16 and the middle crossbar 18. The two sets of neutral poles 17 are symmetrically arranged to further enhance the stability of the trolley.

[0053] As Figure 4 and Figure 6 shown, a rotating ring 125 is rotatably arranged at a position between the bottom sleeve 123 and the fixing ring 124 on the vertical pole 11. For the convenience of description, the rotating ring 125 installed on the front vertical pole is defined as the first rotating ring, and the rotating ring 125 installed on the rear vertical pole is defined as the second rotating ring. At the same time, there is a set of the first rotating ring and the second rotating ring, and they are on the front vertical pole and the rear vertical pole arranged diagonally.

[0054] Meanwhile, a first diagonal rod 110 is fixedly installed on the first rotating ring. The first diagonal rod 110 is adapted to rotate horizontally around the front vertical pole as the first rotating ring rotates, and a second diagonal rod 111 is fixedly installed on the second rotating ring. The second diagonal rod 111 is adapted to rotate horizontally around the rear vertical pole as the second rotating ring rotates.

[0055] In this embodiment, a folding assembly is connected to the other ends of the first diagonal rod 110 and the second diagonal rod 111. The folding assembly is adapted to fold together with the trolley and support the bottom of the trolley when the trolley is in the unfolded state.

[0056] As Figure 4 shown, the folding assembly includes a fixed shaft (not marked in the figure) fixedly installed on the first diagonal rod 110 and the second diagonal rod 111. An upper sleeve 112 is rotatably installed at the upper end of the fixed shaft. At the same time, an upper rod 114 is fixedly installed between the two sets of upper sleeves 112, and two sets of clamping sleeves 117 are fixedly arranged on the upper rod 114. The upper end of the clamping sleeve 117 is provided with a first opening (not marked in the figure), and the first opening is adapted to be clamped on the middle crossbar 18 to facilitate fixing the folding assembly.

[0057] Meanwhile, a lower sleeve 113 is rotatably installed at the lower end of the fixed shaft. At the same time, a lower rod 115 is fixedly installed between the two sets of lower sleeves 113. A middle shaft 116 is rotatably installed between the middle part of the lower rod 115 and the middle part of the upper rod 114, so as to connect the lower rod 115 and the upper rod 114 through the middle shaft 116.

[0058] To sum up, when the trolley is in use, the first vertical rod 12 and the second vertical rod 13 are in a horizontal state, and the first opening of the clamping sleeve 117 is clamped on the middle crossbar 18. At this time, the trolley is in the unfolded state to facilitate the loading of goods.

[0059] When the trolley is not in use, the staff pulls the middle crossbar 18 upward so that the middle crossbar 18 disengages from the clamping sleeve 117. The first vertical rod 12 and the second vertical rod 13 rotate relative to each other and are in a vertical state. At this time, the trolley is in a folded state, so as to have a smaller volume, which is convenient for the storage of the trolley. Moreover, during the folding process of the trolley, the overall height of the trolley does not increase, further reducing the difficulty of storing the trolley.

[0060] As another embodiment of the folding assembly, as Figure 5 shown, the folding assembly includes a lower ring sleeve 118 fixedly installed on the first diagonal rod 110 and the second diagonal rod 111. An upper rotating shaft 119 is rotatably arranged on the lower ring sleeve 118. At the same time, a connecting rod 120 is fixedly installed between the two groups of upper rotating shafts 119. Two groups of transition sleeves 121 are fixedly arranged on the connecting rod 120. A second opening (not marked in the figure) is arranged at the upper end of the transition sleeve 121, and the second opening is adapted to be clamped on the middle crossbar 18 to facilitate the fixation of the folding assembly.

[0061] As Figure 6 shown, a protective sleeve 19 is fixedly arranged at the lower end of the vertical rod 11. The protective sleeve 19 is located outside the fixed ring 124 and the rotating ring 125 for protecting the two. At the same time, a second arc groove 192 is arranged at the upper end of the protective sleeve 19 for avoiding the connection between the first vertical rod 12 and the fixed ring 124. And a horizontal first arc groove 191 is arranged at the lower end of the protective sleeve 19 for avoiding the first diagonal rod 110 (the second diagonal rod 111) when it rotates.

[0062] To facilitate the movement of the trolley, as Figures 1 - 3 shown, a wheel mechanism 3 is installed at the bottom of the vertical rod 11. The wheel mechanism 3 is used to drive the movement or lock of the trolley. The wheel mechanism 3 includes a wheel frame 33 detachably installed at the lower end of the front vertical rod. A front wheel 31 is rotatably arranged on the wheel frame 33. At the same time, a connecting seat 34 is detachably installed at the lower end of the rear vertical rod. A rear wheel 32 is rotatably installed on the connecting seat 34, so that the trolley can be driven to move through the cooperation of the front wheel 31 and the rear wheel 32;

[0063] To brake the trolley, a connecting shaft 36 is rotatably connected between the two groups of connecting seats 34. At the same time, a foot brake 35 is arranged on the connecting shaft 36. The foot brake 35 is used to facilitate the staff to step on, so as to brake the rear wheel 32;

[0064] It should be noted that the structure and principle of using the foot brake 35 to brake the rear wheel 32 can refer to the patent with the publication number of CN214451255 U, and will not be elaborated here;

[0065] To facilitate the operation of the trolley by the staff, as Figures 1 - 3 shown, a traction mechanism 4 is provided on the first crossbar 15. The traction mechanism 4 is for the staff to hold, so as to facilitate the movement of the trolley. The traction mechanism 4 includes a fixed seat 46 fixedly installed on the first crossbar 15. A bottom pull rod 41 is rotatably arranged on the fixed seat 46, so that the bottom pull rod 41 can rotate around the first crossbar 15 to facilitate the adjustment of the traction angle;

[0066] Meanwhile, a sliding cavity (not shown in the figure) is formed at the position of the bottom pull rod 41 away from the first crossbar 15. A top pull rod 42 is slidably installed in the sliding cavity. The top pull rod 42 is adapted to slide in the sliding cavity, so as to extend out of the sliding cavity when the trolley is unfolded and be received in the sliding cavity when the trolley is folded, thereby reducing the occupied volume of the top pull rod 42. The top of the top pull rod 42 is fixedly installed with a handle 43, and the handle 43 is used to facilitate the operation by the staff;

[0067] And a pull sleeve 44 is fixedly sleeved on the bottom pull rod 41. The pull sleeve 44 is located at the opening of the sliding cavity. At the same time, a locking portion 45 is provided on the pull sleeve 44. The locking portion 45 is adapted to penetrate the pull sleeve 44 and the bottom pull rod 41 and extend into the sliding cavity to hold the top pull rod 42, and the locking portion 45 is adapted to be relaxed to move away from the top pull rod 42, so as to facilitate the sliding of the top pull rod 42 in the sliding cavity, thus realizing the sliding and locking of the top pull rod 42 inside the bottom pull rod 41.

[0068] Embodiment 2:

[0069] During the use of the trolley, it is often necessary to be applied in some special occasions, such as as a temporary sales point. At this time, it is necessary to install a canopy to block sunlight or prevent rain, and the temporary addition often requires the staff to additionally add rods for fixation, thus increasing the difficulty of on-site operation;

[0070] To solve the above problems, as Figure 1 - Figure 3 shown, an extension mechanism 2 is provided at the upper end of the vertical rod 11. The extension mechanism 2 is used to expand the vertical rod 11, so as to add appropriate accessories at the upper end of the vertical rod 1;

[0071] As Figure 1 - Figure 3 and Figure 7As shown, the extension mechanism 2 includes an extension block 22 fixedly inserted at the outer upper end of the vertical rod 11. At the same time, a through elliptical groove (not shown) is provided inside the vertical rod 11, and a transition rod 25 is slidably provided inside the elliptical groove, so that the transition rod 25 can slide in the vertical direction inside the elliptical groove. It should be noted that an extension rod 21 is fixedly installed inside the transition rod 25, so that the extension rod 21 can move synchronously with the transition rod 25.

[0072] At the same time, a spring 26 is fixedly installed between the transition rod 25 and the bottom of the elliptical groove, so that in the initial state, the transition rod 25 can be at the upper end of the vertical rod 11 under the action of the spring 26;

[0073] A limiting step (not shown) is provided at the inner bottom end of the extension block 22. The limiting step divides the interior of the extension block 22 into a first section at the lower end and a second section at the upper end. The size of the first section matches the size of the transition rod 25, while the size of the second section is smaller than that of the transition rod 25. Thus, the limiting step can prevent the transition rod 25 from falling out of the vertical pole 11.

[0074] Continue to refer Figure 7 A boss 252 is provided at the bottom of the transition rod 25, and a slideway (not shown in the figure) that cooperates with the boss 252 is provided at the first section of the extension block 22. When the transition rod 25 slides to the upper end of the vertical rod 11, the slideway and the boss 252 cooperate to make the transition rod 25 slide more stably.

[0075] In order to fix the position of the extension rod 21, as Figure 7 and Figure 9 As shown, a horizontal through slot 221 is provided at the upper end of the extension block 22, and a limit block 24 is slidably provided in the through slot 221. The limit block 24 extends out of the outer end of the vertical rod 11 and forms a button 241, and an elastic portion (not shown in the figure) is installed between the limit block 24 and the vertical rod 11. It should be noted that a limit slot 242 is provided on the limit block 24, so that when the elastic portion is pressed, the limit slot 242 is aligned with the axis of the transition rod 25, and a notch 251 is provided at the upper end of the transition rod 25, so that when the elastic portion is in the initial state, the limit block 24 can be stuck in the notch 251 to facilitate limiting the transition rod 25;

[0076] At the same time, a square platform 211 is provided at the upper end of the extension rod 21, so that when the elastic part is in the initial state, it can also be located at the upper end of the square platform 211 and restrict the extension rod 21;

[0077] It can be understood that in the initial state, the extension rod 21 is received in the upright rod 11 , and the limit block 24 is overlapped on the upper end of the square platform 211 , thereby limiting the position of the extension rod 21 ;

[0078] When it is necessary to pull out the extension rod 21, press the button 241 so that the limit groove 242 is aligned with the axis of the transition rod 25. At this time, the restriction of the limit block 24 on the extension rod 21 disappears. The transition rod 25 moves upward under the drive of the spring 26, driving the extension rod 21 to move upward synchronously and reach the highest point position.

[0079] At this time, release the button 241. After the limit block 24 is reset, it snaps into the notch 251, thereby limiting the extension rod 21 in the extended state to maintain the stability of the extension rod 21.

[0080] As Figure 1 and Figures 9 - 10 shown, a connection end 212 is provided at the top of the extension rod 21. A ceiling mechanism 6 is provided at the top of the connection end 212. The ceiling mechanism 6 is used to place a tent at the top of the trolley. The ceiling mechanism 6 includes a top sleeve 63 detachably sleeved on the connection end 212. At the same time, a rotating sleeve 64 is rotatably provided on the top sleeve 63, and a top rod 61 is inserted on the rotating sleeve 64.

[0081] At the same time, a plug 62 is commonly connected at the positions of the four groups of top rods 61 away from the rotating sleeve 64. A socket 65 is rotatably connected to the plug 62. The socket 65 is sleeved on the position of the top rod 61 away from the rotating sleeve 64, so that the four groups of top rods 61 are firmly connected together by the plug 62, facilitating the fixing of the tent and shielding and protecting the trolley.

[0082] As Figures 2 - 3 and Figure 8 shown, a support mechanism 5 is installed at the top of the rear vertical rod. The support mechanism 5 includes a female ring 23 fixedly installed on the extension block 22 at the position of the rear vertical rod. A plurality of card slots 231 are provided on the female ring 23 along the circumferential direction. At the same time, a male ring 28 is provided on one side of the female ring 23. A plurality of teeth 281 are provided on the male ring 28 along the circumferential direction and are matched with the card slots 231. Thus, the male ring 28 and the female ring 23 are snap-connected through the cooperation of the teeth 281 and the card slots 231.

[0083] At the same time, a plug rod 283 is fixedly provided on the male ring 28, and a jack (not marked in the figure) matched with the plug rod 283 is provided on the female ring 23. Thus, the plug rod 283 can extend into the jack to guide the male ring 28 and the female ring 23 when they are connected.

[0084] And a cover plate 27 is installed on one side of the male ring 28 to block one side of the male ring 28.

[0085] Continue to refer to Figure 8, an extension sleeve 282 is provided on the male ring 28. A bent rod 51 is inserted into the extension sleeve 282. At the same time, a handrail 52 is sleeved between the two groups of bent rods 51. The handrail 52 is adapted to connect the two groups of bent rods 51, so that the staff can manually hold the handrail 52, and then assist in pushing the trolley;

[0086] It should be noted that an elastic member is provided between the bent rod 51 and the handrail 52, so that the bent rod 51 can slide inside the handrail 52. Then, when the angle of the bent rod 51 needs to be adjusted, the two groups of bent rods 51 can be brought closer to each other, so that the male ring 28 and the female ring 23 are separated from each other. Then, the male ring 28 rotates relative to the female ring 23, and the teeth 281 at different positions are matched with the slots 231 to adjust the angle, so as to achieve the purpose of adapting to different staff operations.

[0087] The above are only the preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An edge - less flat - foldable trolley underframe assembly, characterized in that: include: Four groups of vertical poles (11) as supports, wherein the four groups of vertical poles (11) are divided into two groups of front vertical poles and two groups of rear vertical poles; A bottom sleeve (123) mounted on the bottom end of the vertical pole (11); A first crossbar (15) and a second crossbar (126) mounted between the bottom sleeves (123); A first fixing ring mounted on the bottom end of the front upright and a second fixing ring mounted on the bottom end of the rear upright; Rotating a first vertical rod (12) disposed on a first fixing ring, and rotating a second vertical rod (13) disposed on a second fixing ring; an articulated sleeve (14) mounted on the second vertical rod (13), wherein the articulated sleeve (14) is hinged to the first vertical rod (12); a first rotating ring mounted on the front upright pole, and a second rotating ring mounted on the rear upright pole; A first oblique rod (110) mounted on the first rotating ring, and a second oblique rod (111) mounted on the second rotating ring; A wheel mechanism (3) for driving the cart to move; A traction mechanism (4) for a worker to hold; and A folding assembly for supporting the bottom of the stroller when the stroller is unfolded, the folding assembly comprising: A lower ring sleeve (118) is fixedly mounted on the first oblique rod (110) and the second oblique rod (111); an upper rotating shaft (119) is rotatably mounted on the lower ring sleeve (118); a connecting rod (120) is mounted between the two groups of the upper rotating shafts (119); two groups of transition sleeves (121) are mounted on the connecting rod (120); and a second opening is disposed at the upper end of the transition sleeve (121).

2. The bottom frame assembly of a borderless flat-foldable trolley according to claim 1, characterized in that: An extension mechanism (2) is provided at the upper end of the vertical rod (11), and the extension mechanism (2) includes an extension block (22) inserted at the upper end of the outer side of the vertical rod (11); a through elliptical groove is provided inside the vertical rod (11), a transition rod (25) is slidably provided inside the elliptical groove, and an extension rod (21) is installed inside the transition rod (25); A spring (26) is installed between the transition rod (25) and the bottom of the elliptical groove, and a limiting step is provided at the inner bottom end of the extension block (22). The limiting step divides the interior of the extension block (22) into a first section at the lower end and a second section at the upper end, wherein the size of the first section matches the size of the transition rod (25), and the size of the second section is smaller than the size of the transition rod (25); A boss (252) is provided at the bottom of the transition rod (25), and a slideway cooperating with the boss (252) is provided at the first section of the extension block (22).

3. The bottom frame assembly of the borderless flat-fold cart according to claim 2, characterized in that: The upper end of the extension block (22) is provided with a horizontal through slot (221), a limit block (24) is slidably provided in the through slot (221), the limit block (24) extends out of the outer end of the vertical rod (11) and forms a button (241), an elastic portion is installed between the limit block (24) and the vertical rod (11), and a limit slot (242) is provided on the limit block (24); A square platform (211) is provided at the upper end of the extension rod (21).

4. The bottom frame assembly of a borderless flat-fold cart according to claim 3, characterized in that: The wheel mechanism (3) includes a wheel frame (33) detachably mounted at the lower end of the front vertical rod. A front wheel (31) is rotatably provided on the wheel frame (33). A connecting seat (34) is detachably mounted at the lower end of the rear vertical rod. A rear wheel (32) is rotatably mounted on the connecting seat (34). A connecting shaft (36) is rotatably connected between two groups of the connecting seats (34). A foot brake (35) is provided on the connecting shaft (36).

5. The bottom frame assembly of a borderless flat-fold cart according to claim 4, characterized in that: A traction mechanism (4) is provided on the first cross bar (15). The traction mechanism (4) includes a fixed seat (46) mounted on the first cross bar (15). A bottom pull rod (41) is rotatably provided on the fixed seat (46). A sliding cavity is formed in the bottom pull rod (41). A top pull rod (42) is slidably mounted in the sliding cavity. A handle (43) is mounted at the top end of the top pull rod (42). A pull sleeve (44) is sleeved and mounted on the bottom pull rod (41). A locking portion (45) is provided on the pull sleeve (44).

6. The frameless flat-folding stroller chassis assembly according to claim 5, characterized in that: A protective sleeve (19) is provided at the lower end of the vertical rod (11). A second arc groove (192) is provided at the upper end of the protective sleeve (19). A horizontal first arc groove (191) is provided at the lower end of the protective sleeve (19).

7. The bottom frame assembly of a borderless flat-foldable trolley according to claim 6, characterized in that: A connecting end (212) is provided at the top end of the extension rod (21). A ceiling mechanism (6) is provided at the top of the connecting end (212). The ceiling mechanism (6) includes a top sleeve (63) detachably sleeved on the connecting end (212). A rotating sleeve (64) is rotatably provided on the top sleeve (63). A top rod (61) is inserted into the rotating sleeve (64).

8. The bottom frame assembly of a borderless flat-foldable trolley according to claim 7, characterized in that: Four groups of the top rods (61) are commonly connected with a plug block (62) at a position away from the rotating sleeve (64). A socket (65) is rotatably connected to the plug block (62). The socket (65) is connected to the top rod (61) at a position away from the rotating sleeve (64).

9. The bottom frame assembly of the borderless flat-foldable trolley according to claim 8, characterized in that: A supporting mechanism (5) is mounted at the top end of the rear vertical rod. The supporting mechanism (5) includes a female ring (23) mounted on the extension block (22). A plurality of groups of card slots (231) are provided on the female ring (23) along the circumferential direction. A male ring (28) is provided on one side of the female ring (23). A plug rod (283) is provided on the male ring (28). A jack cooperating with the plug rod (283) is provided on the female ring (23). An extension sleeve (282) is provided on the male ring (28). A bent rod (51) is inserted into the extension sleeve (282). An armrest (52) is sleeved between two groups of the bent rods (51).

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