Portable frameless flat folding cart capable of not rising after being folded

Abstract

The invention discloses a portable frameless flat folding trolley capable of not rising after being folded, 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 portable frameless flat folding trolley capable of not rising after being folded, by arranging the folding assembly, the whole trolley does not rise in the folding process of the trolley, and therefore 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 portable, foldable, non-elevated, frameless flat-folding trolley. 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 indispensable transport tools. 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 lighter items over short distances.

[0003] For example, the patent with publication number CN115583274 A specifically discloses a gathering type folding trolley, which can gather and store multiple surfaces through the Y-shaped folding components of the front wall and the rear wall, the foldable side walls, and the foldable bottom frame, so as to achieve high gathering of the volume after storage, and a smaller volume, thereby facilitating the storage box of the trolley to be stored;

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

[0005] It should be noted that the above information disclosed in this background technology section is only for understanding the background technology of the present application concept, and therefore, it may contain information that does not constitute the 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 portable frameless flat-folding cart that does not rise, thereby solving the problem of increased height of the cart after folding.

[0007] The technical solution adopted by the present application to solve its technical problems is: a portable foldable non-elevated frameless flat-folding cart, including four groups of vertical poles as supports, the four groups of vertical poles are divided into two groups of front vertical poles and two groups of rear vertical poles; bottom sleeves installed at the bottom ends of the vertical poles; 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 pole and a second fixing ring installed at the bottom end of the rear vertical pole; a first vertical pole rotatably arranged on the first fixing ring, and a second vertical pole rotatably arranged on the second fixing ring; an articulated sleeve installed on the second vertical pole, the articulated sleeve being hinged to the first vertical pole; a first rotating ring installed on the front vertical pole, and a second rotating ring installed on the rear vertical pole; an installation A first diagonal rod on the first rotating ring, and a second diagonal rod installed on the second rotating ring; a wheel mechanism for driving the cart to move; a traction mechanism for a staff member to hold; and a folding assembly for supporting the bottom of the cart when the cart is unfolded, the folding assembly comprising: a fixed shaft fixedly installed on the first diagonal rod and the second diagonal rod, an upper sleeve rotatably installed on the upper end of the fixed shaft, an upper rod installed between two groups of the upper sleeves, two groups of clamping sleeves are provided on the upper rod, and a first opening is provided on the upper end of the clamping sleeve; a lower sleeve rotatably installed on the lower end of the fixed shaft, a lower rod installed between the two groups of the lower sleeves, and a middle shaft rotatably installed between the middle part of the lower rod and the middle part of the upper rod.

[0008] A portable foldable flat-folding cart without frame, characterized in that: it comprises four groups of vertical poles as supports, the four groups of vertical poles are divided into two groups of front vertical poles and two groups of rear vertical poles; bottom sleeves installed at the bottom ends of the vertical poles; first cross bars and second cross bars installed between the bottom sleeves; first fixing rings installed at the bottom ends of the front vertical poles and second fixing rings installed at the bottom ends of the rear vertical poles; first vertical poles rotatably arranged on the first fixing rings, and second vertical poles rotatably arranged on the second fixing rings; hinged sleeves installed on the second vertical poles, the hinged sleeves being hinged to the first vertical poles; first rotating rings installed on the front vertical poles, and a second rotating ring installed on the rear upright; a first oblique rod installed on the first rotating ring, and a second oblique rod installed on the second rotating ring; a wheel mechanism for driving the cart to move; a traction mechanism for staff to hold; and a folding assembly for supporting the bottom of the cart when the cart is unfolded, the folding assembly comprising: a lower ring sleeve fixedly installed on the first oblique rod and the second oblique rod, an upper rotating shaft rotatably provided on the lower ring sleeve, a connecting rod installed between the two groups of the upper rotating shafts, two groups of transition sleeves provided on the connecting rod, and a second opening provided on the upper end of the transition sleeve.

[0009] A portable, foldable, non-elevated, frameless, flat-folding cart, characterized in that it includes four groups of vertical poles as supports, the four groups of vertical poles are divided into two groups of front vertical poles and two groups of rear vertical poles; bottom sleeves installed at the bottom ends of the vertical poles; 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 pole and a second fixing ring installed at the bottom end of the rear vertical pole; a first vertical pole rotatably arranged on the first fixing ring, and a second vertical pole rotatably arranged on the second fixing ring; an articulated sleeve installed on the second vertical pole, the articulated sleeve being articulated with the first vertical pole; a first rotating ring installed on the front vertical pole, and a second rotating ring installed on the rear vertical pole; a first oblique rod installed on the first rotating ring, and a second oblique rod installed on the second rotating ring; a wheel mechanism for driving the cart to move; and a wheel mechanism for staff A traction mechanism for holding; and a folding component for supporting the bottom of the cart when the cart is unfolded; an extension mechanism is provided at the upper end of the vertical pole, and the extension mechanism includes an extension block inserted at the upper end of the outer side of the vertical pole, and a through elliptical groove is provided inside the vertical pole, and a transition rod is slidably provided inside the elliptical groove, and an extension rod is installed inside the transition rod; a spring is installed between the transition rod and the bottom of the elliptical groove, and a limiting step is provided at the inner bottom end of the extension block, and the limiting step divides the interior 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 the size of the transition rod, and the size of the second section is smaller than the size of the transition rod; a boss is provided at the bottom of the transition rod, and a slideway matching the boss is provided at the first section of the extension block.

[0010] Furthermore, a horizontal through slot is provided at the upper end of the extension block, a limit block is slidably provided in the through slot, the limit block extends out of the outer end of the vertical pole and forms a button, an elastic part is installed between the limit block and the vertical pole, and a limit slot is provided on the limit block; a square platform is provided at the upper end of the extension rod.

[0011] Furthermore, the wheel mechanism includes a wheel frame detachably mounted on the lower end of the front upright, on which the front wheel is rotatably mounted, and a connecting seat detachably mounted on the lower end of the rear upright, on which the rear wheel is rotatably mounted; a connecting shaft is rotatably connected between the two groups of connecting seats, and a foot brake is arranged on the connecting shaft.

[0012] Furthermore, a traction mechanism is provided on the first cross bar, and the traction mechanism includes a fixed seat installed on the first cross bar, and a bottom pull rod is rotatably provided on the fixed seat; a sliding cavity is opened on the bottom pull rod, and a top pull rod is slidably installed in the sliding cavity, and a handle is installed on the top end of the top pull rod; a pull sleeve is sleeved on the bottom pull rod, and a locking portion is provided on the pull sleeve.

[0013] Furthermore, a protective cover is provided at the lower end of the vertical pole, a second arc groove is provided at the upper end of the protective cover, and a horizontal first arc groove is provided at the lower end of the protective cover.

[0014] Furthermore, a connecting end is provided at the top of the extension rod, and a ceiling mechanism is provided on the top of the connecting end. The ceiling mechanism includes a top sleeve detachably mounted on the connecting end, a rotating sleeve is rotatably provided on the top sleeve, and a top rod is inserted into the rotating sleeve.

[0015] Furthermore, the positions of the four groups of push rods away from the rotating sleeve are commonly connected to an insert block, the insert block is rotatably connected to a insert sleeve, and the insert sleeve is connected to the position of the push rod away from the rotating sleeve.

[0016] Furthermore, a supporting mechanism is installed at the top of the rear upright pole, and the supporting mechanism includes a female ring installed on the extension block, a plurality of groups of slots are arranged on the female ring along the circumferential direction, and a male ring is arranged on one side of the female ring;

[0017] The male ring is provided with an insertion rod, and the female ring is provided with a socket matched with the insertion rod;

[0018] An extension sleeve is arranged on the male ring, a curved rod is inserted in the extension sleeve, and a handrail is arranged between two groups of the curved rods.

[0019] The present application provides a portable, foldable, non-elevated, frameless flat-folding cart, which has the following beneficial effects:

[0020] 1. By providing a folding assembly, the trolley is suitable for being in an unfolded and folded state, and has a smaller volume when folded, thereby facilitating the storage of the trolley. In addition, during the folding process of the trolley, the trolley as a whole does not rise, thereby further reducing the difficulty of storing the trolley.

[0021] 2. By providing an extension mechanism, the top of the trolley can be extended and expanded, and a roof mechanism is installed to protect the trolley.

[0022] 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 goods.

[0023] In addition to the above-described purposes, features and advantages, the present application has other purposes, features and advantages. The present application will be further described in detail below with reference to the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The drawings in the specification, which constitute a part of the present application, are used to provide further understanding of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute improper limitations on the present application.

[0025] In the attached picture:

[0026] Figure 1 The overall schematic diagram of a portable foldable flat-folding stroller without raising the frame in this application Figure 1 ;

[0027] Figure 2 The overall schematic diagram of a portable foldable flat-folding stroller without raising the frame in this application Figure 2 ;

[0028] Figure 3 for Figure 2 Exploded schematic diagram of the overall structure;

[0029] Figure 4 for Figure 1 Schematic diagram of the local structure at A in the middle;

[0030] Figure 5 for Figure 2 Schematic diagram of the local structure at B in the middle;

[0031] Figure 6 for Figure 3 Schematic diagram of the local structure at C in the middle;

[0032] Figure 7 for Figure 3 Schematic diagram of the local structure at D in the middle;

[0033] Figure 8 for Figure 3 Schematic diagram of the local structure at E in the middle;

[0034] Fig. 9 for Figure 3 Schematic diagram of the local structure at F in the middle;

[0035] Fig.10 for Figure 3 Schematic diagram of the local structure at G in the middle;

[0036] Among them, the reference numerals in the figure are:

[0037] 1. Frame mechanism; 11. Vertical pole; 12. First vertical pole; 13. Second vertical pole; 14. Articulated sleeve; 15. First crossbar; 16. Side crossbar; 17. Middle vertical pole; 18. Middle crossbar; 19. Protective sleeve; 191. First arc groove; 192. Second arc groove; 110. First oblique pole; 111. Second oblique pole; 112. Upper sleeve; 113. Lower sleeve; 114. Upper pole; 115. Lower pole; 116. Middle shaft; 117. Snap 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;

[0038] 2. Extension mechanism; 21. Extension rod; 211. Square platform; 212. Connecting end; 22. Extension block; 221. Through slot; 23. Female ring; 231. Clamping slot; 24. Limiting block; 241. Button; 242. Limiting slot; 25. Transition rod; 251. Notch; 252. Boss; 26. Spring; 27. Cover plate; 28. Male ring; 281. Clamping teeth; 282. Extension sleeve; 283. Inserting rod;

[0039] 3. Wheel mechanism; 31. Front wheel; 32. Rear wheel; 33. Wheel frame; 34. Connecting seat; 35. Foot brake; 36. Connecting shaft;

[0040] 4. traction mechanism; 41. bottom pull rod; 42. top pull rod; 43. handle; 44. pull sleeve; 45. locking part; 46. fixing seat;

[0041] 5. Support mechanism; 51. Bend rod; 52. Handrail;

[0042] 6. Ceiling mechanism; 61. Push rod; 62. Insert block; 63. Top sleeve; 64. Rotating sleeve; 65. Insert sleeve. DETAILED DESCRIPTION

[0043] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0044] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0045] Embodiment 1:

[0046] This embodiment describes the structure and folding principle of the trolley, specifically:

[0047] like Figure 1 As shown, the present application provides a portable foldable flat-folding cart without frame, including a frame mechanism 1, which is the main part of the cart and is used to carry goods. The frame mechanism 1 includes four groups of upright poles 11. For the convenience of description, Figure 1 Taking the view in FIG. 1 as an example, along the moving direction of the trolley, the two groups of upright poles 11 on the left are defined as front upright poles, and the two groups of upright poles 11 on the right are defined as rear upright poles;

[0048] like Figure 1-Figure 3 and Figure 6 As shown, bottom sleeves 123 are fixedly installed at the bottom ends of the four groups of upright poles 11, wherein a first cross bar 15 is fixedly installed between the two groups of bottom sleeves 123 on the front upright poles, and a second cross bar 126 is fixedly installed between the two groups of bottom sleeves 123 on the rear upright poles, so that the two groups of front upright poles are connected together through the first cross bar 15, and the two groups of rear upright poles are connected together through the second cross bar 126 to form a stable whole;

[0049] At the same time, a fixing ring 124 is fixedly provided at the bottom ends of the two groups of front uprights and the two groups of rear uprights. For the convenience of description, the fixing ring 124 connected to the front uprights is defined as a first fixing ring, and the fixing ring 124 connected to the rear uprights is defined as a second fixing ring;

[0050] 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 a vertical direction, and 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 a vertical direction;

[0051] Continue to refer Figure 1-Figure 3 and Figure 6 A hinge sleeve 14 is installed at a position of the second vertical rod 13 away from the second fixing ring, and the hinge sleeve 14 is hinged to one end of the first vertical rod 12 away from the first fixing ring, so that the first vertical rod 12 and the second vertical rod 13 can rotate relative to each other and are both in a horizontal state so that the trolley is in an unfolded state, and are both in a vertical state so that the trolley is in a stored state;

[0052] like Figure 1 - Figure 2 As shown, side cross bars 16 and middle cross bars 18 are fixedly installed between the two groups of first vertical bars 12 and the two groups of second vertical bars 13, wherein the side cross bars 16 are located close to the vertical bars 11, and the middle cross bars 18 are located close to the hinge sleeves 14, so that the two groups of vertical bars can be kept stable by the side cross bars 16 and the middle cross bars 18;

[0053] At the same time, two sets of neutral rods 17 are fixedly installed between the side crossbars 16 and the middle crossbar 18, and the two sets of neutral rods 17 are symmetrically arranged to further enhance the stability of the trolley;

[0054] like Figure 4 and Figure 6 As shown, a rotating ring 125 is rotatably provided at a position between the bottom sleeve 123 and the fixed 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 a first rotating ring, and the rotating ring 125 installed on the rear vertical pole is defined as a second rotating ring. At the same time, a group of the first rotating ring and the second rotating ring are provided, and are located on the front vertical pole and the rear vertical pole which are arranged diagonally.

[0055] Meanwhile, a first oblique rod 110 is fixedly mounted on the first rotating ring, and the first oblique rod 110 is adapted to rotate in the horizontal direction around the front vertical rod along with the first rotation, and a second oblique rod 111 is fixedly mounted on the second rotating ring, and the second oblique rod 111 is adapted to rotate in the horizontal direction around the rear vertical rod along with the second rotation;

[0056] In this embodiment, the other end of the first oblique rod 110 and the other end of the second oblique rod 111 are connected with a folding assembly, which is suitable for folding together with the trolley and supporting the bottom of the trolley when the trolley is in the unfolded state;

[0057] like Figure 4 As shown, the folding assembly includes a fixed shaft (not shown in the figure) fixedly mounted on the first oblique rod 110 and the second oblique rod 111, an upper sleeve 112 is rotatably mounted on the upper end of the fixed shaft, and an upper rod 114 is fixedly mounted between the two sets of upper sleeves 112, and two sets of clamping sleeves 117 are fixedly arranged on the upper rod 114, and a first opening (not shown in the figure) is arranged on the upper end of the clamping sleeve 117, and the first opening is suitable for clamping on the middle cross bar 18, so as to fix the folding assembly;

[0058] At the same time, a lower sleeve 113 is rotatably mounted at the lower end of the fixed shaft, and a lower rod 115 is fixedly mounted between the two sets of lower sleeves 113. A middle shaft 116 is rotatably mounted between the middle portion of the lower rod 115 and the middle portion of the upper rod 114, so that the lower rod 115 and the upper rod 114 are connected through the middle shaft 116.

[0059] In summary, 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 into the middle cross bar 18. At this time, the trolley is in an unfolded state to facilitate the loading of goods.

[0060] When the trolley is not in use, the staff pulls the middle cross bar 18 upwards to make the middle cross bar 18 disengage from the snap-on sleeve 117, and the first vertical bar 12 and the second vertical bar 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 be in a smaller volume, thereby facilitating the storage of the trolley. During the folding process of the trolley, the trolley as a whole does not rise, thereby further reducing the difficulty of storing the trolley.

[0061] As another embodiment of the folding assembly, Figure 5 As shown, the folding assembly includes a lower ring sleeve 118 fixedly mounted on the first oblique rod 110 and the second oblique rod 111, and an upper rotating shaft 119 is rotatably arranged on the lower ring sleeve 118. At the same time, a connecting rod 120 is fixedly mounted between the two groups of upper rotating shafts 119, and 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 suitable for being clamped on the middle cross bar 18 to facilitate fixing the folding assembly.

[0062] like Figure 6 As shown, a protective cover 19 is fixedly provided at the lower end of the vertical rod 11, and the protective cover 19 is located on the outside of the fixed ring 124 and the rotating ring 125, and is used to protect both of them. At the same time, a second arc groove 192 is provided at the upper end of the protective cover 19, and the second arc groove 192 is used to avoid the connection between the first vertical rod 12 and the fixed ring 124, and a horizontal first arc groove 191 is provided at the lower end of the protective cover 19, and the first arc groove 191 is used to avoid the first diagonal rod 110 (second diagonal rod 111) when it rotates.

[0063] In order to facilitate the movement of the trolley, Figure 1-Figure 3 As shown, a wheel mechanism 3 is installed at the bottom of the vertical pole 11, and the wheel mechanism 3 is used to drive the trolley to move or lock. The wheel mechanism 3 includes a wheel frame 33 detachably installed at the lower end of the front vertical pole, and a front wheel 31 is rotatably installed on the wheel frame 33. At the same time, a connecting seat 34 is detachably installed at the lower end of the rear vertical pole, and a rear wheel 32 is rotatably installed on the connecting seat 34, so that the trolley can be driven to move by the cooperation of the front wheel 31 and the rear wheel 32;

[0064] In order to brake the trolley, a connecting shaft 36 is rotatably connected between the two sets of connecting seats 34, and a foot brake 35 is provided on the connecting shaft 36, which is convenient for the staff to step on so as to brake the rear wheel 32;

[0065] It should be noted that the structure and principle of using the foot brake 35 to brake the rear wheel 32 can be referred to the patent publication number CN214451255 U, and will not be described in detail here;

[0066] In order to facilitate the staff to operate the trolley, such as Figure 1-Figure 3 As shown, a traction mechanism 4 is provided on the first cross bar 15, and the traction mechanism 4 is used for the staff to hold so as to push the trolley to move. The traction mechanism 4 includes a fixed seat 46 fixedly installed on the first cross bar 15, and a bottom pull rod 41 is rotatably provided on the fixed seat 46, so that the bottom pull rod 41 can rotate around the first cross bar 15, so as to adjust the traction angle;

[0067] At the same time, a sliding cavity (not shown in the figure) is provided at a position of the bottom pull rod 41 away from the first cross bar 15, and a top pull rod 42 is slidably installed in the sliding cavity. The top pull rod 42 is suitable for sliding in the sliding cavity so as to extend out of the sliding cavity when the trolley is unfolded, and be stored in the sliding cavity when the trolley is folded, thereby reducing the occupied volume of the top pull rod 42. A handle 43 is fixedly installed at the top end of the top pull rod 42, and the handle 43 is used for convenient hand-held operation by staff;

[0068] A pull sleeve 44 is fixedly mounted on the bottom pull rod 41, and the pull sleeve 44 is located at the opening of the sliding cavity. A locking portion 45 is provided on the pull sleeve 44, and the locking portion 45 is suitable for passing through the pull sleeve 44 and the bottom pull rod 41 and extending into the sliding cavity to resist the top pull rod 42, and the locking portion 45 is suitable for relaxing to move away from the top pull rod 42 so that the top pull rod 42 can slide in the sliding cavity, thereby realizing the sliding and locking of the top pull rod 42 inside the bottom pull rod 41.

[0069] Embodiment 2:

[0070] In the process of using the trolley, it is often used in some special occasions, such as as a temporary sales point, at this time, a roof needs to be installed to block the sun or prevent rain. The temporary addition often requires the staff to add additional rods for fixing, which increases the difficulty of on-site operation;

[0071] In order to solve the above problems, Figure 1 - Figure 3 As shown, an extension mechanism 2 is provided at the upper end of the vertical pole 11, and the extension mechanism 2 is used to expand the vertical pole 11 so as to add a suitable accessory to the upper end of the vertical pole 11;

[0072] like Figure 1 - Figure 3 and Figure 7As shown, the extension mechanism 2 includes an extension block 22 fixedly inserted at the upper end of the outer side of the vertical rod 11, and a through elliptical groove (not shown in the figure) 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;

[0073] 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 located at the upper end of the vertical rod 11 under the action of the spring 26;

[0074] A limiting step (not shown in the figure) is provided at the inner bottom end of the extension block 22, and the limiting step divides the inner part 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, so that the limiting step can prevent the transition rod 25 from escaping from the vertical rod 11;

[0075] 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) cooperating with the boss 252 is provided at the first section of the extension block 22, so that 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;

[0076] In order to fix the position of the extension rod 21, Figure 7 and Fig. 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 part (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 part 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 part is in the initial state, the limit block 24 can be stuck in the notch 251, so as to limit the transition rod 25;

[0077] 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;

[0078] 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;

[0079] When the extension rod 21 needs to be pulled out, the button 241 is pressed to align the limit slot 242 with the axis of the transition rod 25. At this time, the limit of the limit block 24 on the extension rod 21 disappears, and 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;

[0080] At this time, the button 241 is released, and the limiting block 24 is reset and snapped into the notch 251 , thereby limiting the extension rod 21 in the extended state to maintain the stability of the extension rod 21 .

[0081] like Figure 1 and Figure 9-10 As shown, a connecting end 212 is provided at the top of the extension rod 21, and a roof mechanism 6 is provided on the top of the connecting end 212. The roof mechanism 6 is used to place a tent on the top of the cart. The roof mechanism 6 includes a top cover 63 detachably sleeved on the connecting end 212, and a rotating cover 64 is rotatably provided on the top cover 63, and a top rod 61 is inserted on the rotating cover 64;

[0082] At the same time, the four groups of top rods 61 are commonly connected to the positions away from the rotating sleeve 64 with an insertion block 62, and the insertion sleeve 65 is rotatably connected to the insertion block 62. The insertion sleeve 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 through the insertion block 62, so as to fix the tent and provide shielding and protection for the trolley.

[0083] like Figure 2-Figure 3 and Figure 8 As shown, a supporting mechanism 5 is installed at the top of the rear upright pole, and the supporting mechanism 5 includes a female ring 23 fixedly installed on the extension block 22 at the position of the rear upright pole, and a plurality of groups of slots 231 are arranged on the female ring 23 along the circumferential direction, and a male ring 28 is arranged on one side of the female ring 23, and a locking tooth 281 cooperating with the slot 231 is arranged on the male ring 28 along the circumferential direction, so that the male ring 28 is engaged and connected with the female ring 23 through the cooperation of the locking tooth 281 and the slot 231;

[0084] At the same time, a plug rod 283 is fixedly provided on the male ring 28, and a socket (not shown in the figure) matching with the plug rod 283 is provided on the female ring 23, so that the plug rod 283 can be inserted into the socket to guide the male ring 28 and the female ring 23 when they are connected;

[0085] A cover plate 27 is installed on one side of the male ring 28 to seal one side of the male ring 28 .

[0086] Continue to refer Figure 8An extension sleeve 282 is provided on the male ring 28, and a curved rod 51 is inserted into the extension sleeve 282. At the same time, a handrail 52 is provided between the two sets of curved rods 51. The handrail 52 is suitable for connecting the two sets of curved rods 51, so that the staff can manually hold the handrail 52 to assist in pushing the trolley;

[0087] It should be noted that an elastic member is provided between the curved rod 51 and the armrest 52, so that the curved rod 51 can slide inside the armrest 52. When the angle of the curved rod 51 needs to be adjusted, the two groups of curved 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, and then the male ring 28 is rotated relative to the female ring 23. The angle can be adjusted by using the locking teeth 281 in different positions to cooperate with the locking groove 231 to achieve the purpose of adapting to the operation of different staff members.

[0088] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. 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. A portable, foldable, non-elevated, frameless flat-folding cart, characterized by: 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) installed at the bottom end of the vertical pole (11); A first cross bar (15) and a second cross bar (126) mounted between the bottom sleeves (123); A first fixing ring installed at the bottom end of the front upright pole and a second fixing ring installed at the bottom end of the rear upright pole; 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), the articulated sleeve (14) being articulated with 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 the staff to hold; and A folding assembly for supporting the bottom of a cart when the cart is unfolded, the folding assembly comprising: A fixed shaft fixedly mounted on the first oblique rod (110) and the second oblique rod (111), an upper sleeve (112) being rotatably mounted on the upper end of the fixed shaft, an upper rod (114) being mounted between the two groups of the upper sleeves (112), two groups of clamping sleeves (117) being arranged on the upper rod (114), and a first opening being arranged at the upper end of the clamping sleeve (117); A lower sleeve (113) is rotatably mounted at the lower end of the fixed shaft, a lower rod (115) is mounted between two groups of the lower sleeves (113), and a middle shaft (116) is rotatably mounted between the middle of the lower rod (115) and the middle of the upper rod (114).

2. A portable, foldable, non-elevated, frameless flat-folding cart, 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) installed at the bottom end of the vertical pole (11); A first cross bar (15) and a second cross bar (126) mounted between the bottom sleeves (123); A first fixing ring installed at the bottom end of the front upright pole and a second fixing ring installed at the bottom end of the rear upright pole; 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), the articulated sleeve (14) being articulated with 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 the staff to hold; and A folding assembly for supporting the bottom of a cart when the cart 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 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).

3. A portable, foldable, non-elevated, frameless flat-folding cart, 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) installed at the bottom end of the vertical pole (11); A first cross bar (15) and a second cross bar (126) mounted between the bottom sleeves (123); A first fixing ring installed at the bottom end of the front upright pole and a second fixing ring installed at the bottom end of the rear upright pole; 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), the articulated sleeve (14) being articulated with 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 the worker to hold; and A folding assembly for supporting the bottom of the cart when the cart is unfolded; An extension mechanism (2) is provided at the upper end of the vertical rod (11), and the extension mechanism (2) comprises 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 dividing the interior of the extension block (22) 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 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 matching the boss (252) is provided at the first section of the extension block (22).

4. A portable, foldable, non-elevated, frameless flat-folding stroller according to claim 3, 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 arranged 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 part is installed between the limit block (24) and the vertical rod (11), and a limit slot (242) is arranged on the limit block (24); A square platform (211) is provided at the upper end of the extension rod (21).

5. A portable, foldable, non-elevated, frameless flat-folding stroller according to claim 4, characterized in that: The wheel mechanism (3) comprises a wheel frame (33) detachably mounted at the lower end of the front upright pole, a front wheel (31) being rotatably mounted on the wheel frame (33), and a connecting seat (34) detachably mounted at the lower end of the rear upright pole, a rear wheel (32) being rotatably mounted on the connecting seat (34); A connecting shaft (36) is rotatably connected between the two groups of connecting seats (34), and a foot brake (35) is arranged on the connecting shaft (36).

6. A portable, foldable, non-elevated, frameless flat-folding stroller according to claim 5, characterized in that: A traction mechanism (4) is provided on the first crossbar (15), and the traction mechanism (4) comprises a fixing seat (46) installed on the first crossbar (15), and a bottom pull rod (41) is rotatably provided on the fixing seat (46); The bottom pull rod (41) is provided with a sliding cavity, a top pull rod (42) is slidably installed in the sliding cavity, and a handle (43) is installed at the top end of the top pull rod (42); A pull sleeve (44) is sleeved and installed on the bottom pull rod (41), and a locking portion (45) is provided on the pull sleeve (44).

7. A portable, foldable, non-elevated, frameless flat-folding stroller according to claim 6, characterized in that: The lower end of the vertical pole (11) is provided with a protective sleeve (19), the upper end of the protective sleeve (19) is provided with a second arc groove (192), and the lower end of the protective sleeve (19) is provided with a horizontal first arc groove (191).

8. A portable, foldable, non-elevated, frameless flat-folding stroller according to claim 7, characterized in that: The top end of the extension rod (21) is provided with a connection end (212), and the top of the connection end (212) is provided with a ceiling mechanism (6), and the ceiling mechanism (6) comprises a top sleeve (63) detachably sleeved on the connection end (212), and a rotating sleeve (64) is rotatably provided on the top sleeve (63), and the top rod (61) is inserted into the rotating sleeve (64).

9. A portable, foldable, non-elevated, frameless flat-folding stroller according to claim 8, characterized in that: The four groups of push rods (61) are commonly connected to an insert block (62) at positions away from the rotating sleeve (64); the insert block (62) is rotatably connected to an insert sleeve (65); and the insert sleeve (65) is connected to a position of the push rod (61) away from the rotating sleeve (64).

10. A portable, foldable, non-elevated, frameless flat-folding stroller according to claim 9, characterized in that: A supporting mechanism (5) is installed at the top end of the rear upright pole, the supporting mechanism (5) comprising a female ring (23) installed on the extension block (22), a plurality of groups of slots (231) are arranged on the female ring (23) along the circumferential direction, and a male ring (28) is arranged on one side of the female ring (23); The male ring (28) is provided with an insertion rod (283), and the female ring (23) is provided with a socket matched with the insertion rod (283); An extension sleeve (282) is provided on the male ring (28), a curved rod (51) is inserted into the extension sleeve (282), and a handrail (52) is sleeved between two groups of the curved rods (51).

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