Pull rod lifting and collecting structure of trolley wheel and portable folding trolley

Abstract

The pull rod lifting and collecting structure comprises a conveying plate, a connecting rod fixed to a pressing plate, a trundle rotationally installed on the connecting rod through a wheel frame, an overturning limiting piece installed on the connecting rod in a sliding mode and a first spring elastically acting on the overturning limiting piece, and the trundle comprises a torsional spring capable of acting on the trundle to rotate and collect. The first spring elastically acts on the overturning limiting piece to be attached to the wheel frame, the overturning limiting piece and the wheel frame are matched and limited through a concave-convex structure, the overturning limiting piece can limit the wheel frame to be used perpendicular to the conveying plate or to be attached to the conveying plate to be stored, a lifting part is arranged on the conveying plate, a grip is installed on the lifting part or the conveying plate in a sliding mode, and a pull rod is rotationally connected between the grip and the overturning limiting piece. Compared with the prior art, the caster has the advantages that the lifting part and the grip are kneaded, so that the caster can rotate to be attached to the conveying plate for storage, and the storage operation of the caster is simple and convenient.

Description

Technical Field

[0001] The invention relates to the technical field of trolleys, in particular to a folding wheel of a trolley, and in particular to a pull rod lifting structure of a wheel of a trolley and a portable folding trolley. Background Art

[0002] A trolley is a tool for carrying items in daily household or in places where traffic is inconvenient. The trolley is equipped with casters to save effort when pushed and pulled. However, when the trolley is not in use, in order to reduce the space occupied by the trolley, some trolleys can fold the casters.

[0003] For example, the patent with authorization announcement number CN214929884U provides a caster folding structure for a flatbed cart, in which when the wheel needs to be folded, the pushing part of the push handle needs to be flipped over so that it is horizontal with the fixed part of the push handle, and the push handle is pushed into the positioning strip hole below the support plate, so that the positioning pin passes through the two positioning beads and separates from the engaging positioning groove. When the front end of the pushing part enters the positioning strip hole, it contacts the two positioning blocks and pushes the two positioning blocks to move backward, driving the two sliding tubes and the pins and guide rods on the sliding tubes to move backward. After the pin disengages from the open positioning groove and the guide rod disengages from the engaging positioning groove, it moves along the guide strip hole, and the pin moves backward along the arc track, prompting the caster fixing seat to change from a vertical state to a horizontal state, and simultaneously driving the caster to change from an open state to a folded state.

[0004] When folding the wheels in this patent, the operation of folding the wheels by using a push handle is relatively complicated and requires a larger operating space, making the wheel folding operation relatively inconvenient. Summary of the invention

[0005] The present invention aims to solve the problem that the operation of folding the wheels of existing trolleys is complicated and inconvenient. The technical problem to be solved by the present invention is to provide a trolley wheel pull rod carrying structure and a portable folding trolley that can make the wheel folding operation simple and convenient.

[0006] The technical solution adopted by the present invention to solve the above technical problems is: a pull rod lifting structure of a wheel of a trolley includes a transport plate, a connecting rod fixed on a pressure plate, a plurality of casters rotatably mounted on the connecting rod, a flip limiter slidably mounted on the connecting rod and capable of limiting the rotation of the casters on the connecting rod, and a spring 1 elastically acting on the flip limiter;

[0007] The caster comprises a wheel frame rotatably mounted on a connecting rod, the flip limiter and the wheel frame are limited by a concave-convex structure, and the flip limiter and the concave-convex structure between the wheel frame are elastically acted on by the spring, and the flip limiter can limit the wheel frame to be used vertically for transporting a board or to be stored in close contact with the transporting board;

[0008] The transport plate is provided with a lifting part, a handle is slidably installed at the lifting part or on the transport plate, and two springs with elastic action are provided between the lifting part and the handle, a pull rod is connected between the handle and the flip limiter, the pull rod rotatably connects the handle and the flip limiter, and the caster includes a torsion spring that can act on the caster to rotate and store;

[0009] The lifting part and the handle are kneaded, and the handle can pull the flip limiter away from the wheel frame through the pull rod, and the torsion spring can act on the caster to rotate and fit under the transport board.

[0010] A further preferred solution of the present invention is that an adsorption member is fixed below the transport plate, and the adsorption member can be adsorbed and connected to the caster by magnetic attraction.

[0011] A further preferred solution of the present invention is: an operating port for inserting a hand is provided on the transport plate, a horizontal bar that fits the lifting part is fixed under the transport plate, and the handle is slidably inserted between the lifting part and the horizontal bar and exposed in the operating port.

[0012] The technical solution of another subject of the present invention is a portable folding trolley, comprising a group of pull rod lifting structures for wheels of any of the above-mentioned trolleys, wherein the connecting rod is provided with a handle for pushing and pulling the trolley.

[0013] A further preferred solution of the present invention is that when the casters are rotated and fitted under the transport board, a storage cavity is formed between the plurality of casters, and the handle is rotatably installed and can be rotated into the storage cavity.

[0014] A further preferred solution of the present invention is: a limited rotation member is slidably installed on the connecting rod, and the limited rotation member can limit the rotation angle of the handle on the connecting rod through the cooperation of the concave and convex structure, and a spring three is provided to elastically fit the limited rotation member to the handle.

[0015] The technical solution of another subject of the present invention: a portable folding trolley, comprising two sets of pull rod lifting structures of any of the above-mentioned trolley wheels, which are rotatably arranged between adjacent transport boards. When the adjacent transport boards are horizontally unfolded, the end surfaces between the transport boards are fitted and limited to limit the flipping of the two transport boards, and the connecting rod is provided with a handle for pushing and pulling the trolley.

[0016] A further preferred solution of the present invention is that when the casters rotate and fit under the transport board, a storage cavity is formed between the multiple casters, two adjacent transport boards can be rotated, flipped down and fit together, and the handle is rotatably installed, and the handle can be rotated between the two transport boards and located in the storage cavity.

[0017] A further preferred solution of the present invention is: a limited rotation member is slidably installed on the connecting rod, and the limited rotation member can limit the rotation angle of the handle on the connecting rod through the cooperation of the concave and convex structure, and a spring three is provided to elastically fit the limited rotation member to the handle.

[0018] A further preferred solution of the present invention is that a hooking limiter is rotatably mounted on the transport plate, and the hooking limiter can hook and limit the relative rotation of the two transport plates.

[0019] Compared with the prior art, the advantage of the present invention is that through the kneading action of the lifting part and the handle, the handle contracts relative to the lifting part, and the handle drives the flip limiter to slide through the pull rod, so that the concave-convex structure limit between the flip limiter and the wheel frame is released, and the caster can be fitted into the transport board for storage under the action of the torsion spring, and the storage operation of the caster is simple and convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention will be described in further detail below in conjunction with the accompanying drawings and preferred embodiments. However, those skilled in the art will appreciate that these drawings are drawn only for the purpose of explaining the preferred embodiments and therefore should not be regarded as limiting the scope of the present invention. Furthermore, unless otherwise specified, the drawings only conceptually represent the composition or structure of the described objects and may contain exaggerated displays, and the drawings are not necessarily drawn to scale.

[0021] Figure 1 This is a schematic diagram of the structure of a plate transport assembly in a preferred embodiment of the present invention;

[0022] Figure 2 It is one of the cross-sectional views of a first plate transport assembly of a preferred embodiment of the present invention;

[0023] Figure 3 The preferred embodiment of the present invention is Figure 2 The enlarged schematic diagram of the middle A part;

[0024] Figure 4 This is a second cross-sectional view of the first plate transport assembly of the preferred embodiment of the present invention;

[0025] Figure 5 The preferred embodiment of the present invention is Figure 4 The enlarged schematic diagram of the middle part B;

[0026] Figure 6 This is an exploded view of a caster, a flip limiter and a connecting rod in a preferred embodiment of the present invention;

[0027] Figure 7 It is a structural schematic diagram of a folded caster on a pallet transport assembly in a preferred embodiment of the present invention;

[0028] Figure 8 This is a schematic structural diagram of a trolley in a preferred embodiment of the present invention;

[0029] Fig. 9 It is a cross-sectional view of a trolley according to a preferred embodiment of the present invention;

[0030] Fig.10 The preferred embodiment of the present invention is Fig. 9 The enlarged schematic diagram of the middle C part;

[0031] Fig.11 This is a structural schematic diagram of a handle and a rotation-limiting member on a connecting rod of a trolley in a preferred embodiment of the present invention;

[0032] Fig.12 This is a structural schematic diagram of a trolley in a folded state in a preferred embodiment of the present invention;

[0033] Fig.13 This is a schematic structural diagram of a second-hand cart according to a preferred embodiment of the present invention;

[0034] Fig.14 A cross-sectional view of a second-hand cart according to a preferred embodiment of the present invention;

[0035] Fig.15 The preferred embodiment 2 of the present invention Fig.14 The enlarged schematic diagram of the middle D part;

[0036] Fig.16 It is a structural schematic diagram of the casters and handles on a second-hand cart in a folded state in a preferred embodiment of the present invention;

[0037] Fig.17 It is a structural schematic diagram of a second-hand cart in a folded state according to a preferred embodiment of the present invention.

[0038] In the figure: 1, transport plate, 1a, groove, 1b, retaining wall 1, 1c, lifting part, 1d, guide rib, 1e, blocking part, 1f, action port, 1g, movable port, 1h, avoidance port, 1i, countersunk hole, 1j, retaining wall 2; 2, handle, 2a, guide groove; 3, connecting rod; 4, caster, 4a, seat body, 4a1, accommodating cavity, 4a2, slot 1, 4b, frame body, 4c, roller; 5, flip limiter, 5a, guide groove, 5b, insert 1; 6, pull rod; 7, torsion spring 1; 8, spring 1; 9, spacer 1; 10, spacer 2; 11, Crossbar; 12. Intermediate groove; 13. Second spring; 14. Adsorption member; 15. Rotating connecting member; 16. Guide pin; 17. Handle; 17a. Sleeve; 17a1. Second slot; 17b. Telescopic rod; 18. Rotation limiting member; 18a. Action part; 18b. Slide groove; 18c. Second plug-in block; 19. Limit pin; 20. Third spring; 21. Third spacer; 22. Baffle; 23. Fitting member; 24. First hinge; 25. Second hinge; 26. Hook limit member; 26a. Hook part; 26b. Pressing part; 27. Hook rod; 28. Second torsion spring. DETAILED DESCRIPTION

[0039] Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Those skilled in the art will appreciate that these descriptions are only illustrative and exemplary and should not be construed as limiting the scope of protection of the present invention.

[0040] It should be noted that like reference numerals denote similar items in the following drawings, and thus, once an item is defined in one drawing, it may not be further defined or explained in subsequent drawings.

[0041] This embodiment mainly describes a pull rod carrying structure of a wheel of a trolley and a portable folding trolley that can make the wheel folding operation simple and convenient, as follows:

[0042] Embodiment 1

[0043] like Figure 1-12 As shown, the pull rod lifting structure of the wheel of the trolley and the portable folding trolley include a set of transport board components and a handle 17 connected to the transport board components. The set of transport board components includes a transport board 1, a handle 2 slidably connected to the transport board 1, a connecting rod 3 fixed on the transport board 1, a caster 4 rotatably installed on the connecting rod 3, a flip limiter 5 slidably installed on the connecting rod 3 and limiting the flipping of the caster 4 through a concave-convex structure, a pull rod 6 rotatably connecting the handle 2 and the flip limiter 5, and a torsion spring 7 that can elastically act on the caster 4 to rotate and fit the transport board 1 for storage. The handle 17 is connected to the connecting rod 3.

[0044] The transport plate 1 is provided with a plurality of grooves 1a with lower openings, and the connecting rods 3 are arranged in the grooves 1a and fixed on the transport plate 1 by means of a plurality of sets of screws and nuts.

[0045] Two retaining walls 1b are provided on the transport plate 1, and the caster 4 sleeved on the connecting rod 3 and the flip limiter 5 are located between the two retaining walls 1b. A spring 8 is sleeved on the connecting rod 3, and the spring 8 is located between the retaining wall 1b and the flip limiter 5. The spring 8 elastically acts to make the concave-convex structure between the flip limiter 5 and the caster 4 fit tightly.

[0046] To ensure the stability of the spring 8 when compressed or released, a spacer 9 is provided between the spring 8 and the baffle wall 1b, and to prevent the caster 4 from rubbing against the other baffle wall 1b when rotating around the connecting rod 3, a spacer 10 inserted on the connecting rod 3 is provided between the other baffle wall 1b and the caster 4.

[0047] A lifting portion 1c and an operating port 1f are provided on the transport plate 1, and a cross bar 11 is fixed to the transport plate 1 by screws, a groove 12 is left between the cross bar 11 and the lifting portion 1c, and a plurality of guide ribs 1d are provided in the groove 12 on the lifting portion 1c or the cross bar 11, a handle 2 is inserted into the cross bar 11, and a guide groove 2a cooperating with the guide rib 1d is provided on the handle 2, and the cooperation between the guide rib 1d and the guide groove 2a can limit the handle 2 to slide only close to or away from the lifting portion 1c.

[0048] In order to prevent the handle 2 from sliding off the cross bar 11, a blocking portion 1e is provided on the transport plate 1, and the handle 2 is located between the blocking portion 1e and the lifting portion 1c. The transport plate 1 is also provided with an action port 1f for inserting a hand, and the action port 1f is located between the blocking portion 1e and the lifting portion 1c. The handle 2 is partially exposed in the action port 1f, and a spring 2 13 is provided between the handle 2 and the lifting portion 1c or the cross bar 11. The spring 2 13 elastically acts to move the handle 2 away from the lifting portion 1c and fits on the blocking portion 1e to limit sliding.

[0049] By inserting the hand into the action opening 1f and kneading the lifting part 1c and the handle 2, the handle 2 shrinks relative to the lifting part 1c, and the handle 2 drives the flip limiter 5 to slide through the pull rod 6, so that the concave-convex structure limit between the flip limiter 5 and the wheel frame is released, and the caster 4 can be fitted with the transport board 1 for storage under the action of the torsion spring 1 7. The storage operation of the caster 4 is simple and convenient, and when the tight force of the lifting part 1c and the handle 2 is released, the flip limiter 5 fits the caster 4 again through the elastic action of the spring 1 8, and the handle 2 fits the gear part 1e through the elastic action of the spring 2 13.

[0050] When the trolley is carried, the handle 2 is lifted and grasped without affecting the storage of the caster 4. To ensure that the caster 4 does not rotate on the connecting rod 3 due to shaking when the handle 2 is lifted, an adsorption member 14 is fixed under the transport plate 1. The adsorption member 14 is adsorbed and connected to the caster 4 through magnetic attraction to ensure the stability of the caster 4 in the storage state.

[0051] like Figure 2 , Figure 5 and Figure 6 As shown, a rotating connector 15 is provided on each of the handle 2 and the flip limiter 5. In this embodiment, the rotating connector 15 is connected to the handle 2 or the flip limiter 5 in a T-shaped structure. Both ends of the pull rod 6 adopt a hook structure and are rotatably hooked to the rotating connector 15. The rotating connector 15 can limit the pull rod 6 from detaching. Preferably, the rotating connector 15 can adopt a screw.

[0052] To prevent the flip limiter 5 from rotating on the connecting rod 3 , a guide groove 5 a is provided on the flip limiter 5 , and a guide pin 16 is fixed on the connecting rod 3 . The guide pin 16 is inserted into the guide groove 5 a and limits the flip limiter 5 to slide only on the connecting rod 3 .

[0053] The caster 4 includes a seat body 4a rotatably inserted into the connecting rod 3, a frame body 4b inserted into the seat body 4a and fixedly connected by screws and other accessories, and a roller 4c rotatably installed on the wheel frame. The rotation axes of the seat body 4a and the roller 4c are not colinear and do not intersect. In order to prevent the torsion spring 7 from sliding along the connecting rod 3, a accommodating cavity 4a1 is provided on the seat body 4a. The torsion spring 7 inserted into the connecting rod 3 is located in the accommodating cavity 4a1 and elastically acts on the seat body 4a and the transport plate 1.

[0054] In this embodiment, the seat body 4a is provided with a plurality of recessed slots 4a2, and the flip limiter 5 is provided with a protruding insert block 5b. Under the elastic action of the spring 8, the insert block 5b on the flip limiter 5 can be inserted into the slot 17a1 on the seat body 4a, and under the restriction of the guide pin 16, the rotation of the seat body 4a, i.e. the caster 4, on the connecting rod 3 is restricted.

[0055] When the caster 4 is in the retracted state, the flip limiter 5 has two effects on the caster 4 .

[0056] Case 1: The flip limiter 5 only fits the base 4a of the caster 4, and there is no structure for the slot 4a2 and the plug block 5b to be plugged in between the flip limiter 5 and the base 4a. The stability of the storage state of the caster 4 is achieved by the torsion spring 7 and the adsorption member 14.

[0057] In this case, when the caster 4 needs to be opened to use the trolley, it is only necessary to manually operate the caster 4 to rotate around the connecting rod 3 to overcome the suction force of the adsorption member 14 and the torque of the torsion spring 7, until the caster 4 is rotated to the use state, that is, the slot 4a2 of the seat body 4a corresponds to the position of the insert block 5b of the flip limiter 5, and under the action of the spring 8, the insert block 5b of the flip limiter 5 is inserted into the slot 4a2 and limits the rotation of the seat body 4a, that is, the caster 4, so that the trolley can be used to pull items.

[0058] Case 2: The flip limiter 5 is inserted into the slot 1 4a2 of the seat body 4a through the slot 1 4a2. When the caster 4 is in the storage state, the caster 4 is affected by the flip limiter 5, the torsion spring 1 7 and the adsorption member 14.

[0059] In this case, when the caster 4 needs to be opened to use the trolley, it is necessary to pinch the action handle 2 and the lifting part 1c of the transport plate 1 in advance to disengage the slot 4a2 inserted between the flip limit member 5 and the seat body 4a from the insert block 5b, and then manually operate the caster 4 to rotate around the connecting rod 3 to overcome the suction force of the adsorption member 14 and the torsion force of the torsion spring 7 until the caster 4 is rotated to the use state, release the handle 2, and the flip limit member 5 is reinserted into the slot 4a2 under the action of the spring 8 to limit the rotation of the seat body 4a, that is, the caster 4, so that the trolley can be used to pull and transport items.

[0060] Either the seat body 4a or the flip limiter 5 is provided with a fitting inclined surface, and the caster 4 is manually operated to rotate around the connecting rod 3 to overcome the suction force of the adsorption member 14 and the torsion force of the torsion spring 7. At this time, the seat body 4a can act on the flip limiter 5 to slide on the connecting rod 3 through the inclined surface and compress the spring 8, and the caster 4 is rotated to the use state, that is, the slot 4a2 of the seat body 4a corresponds to the position of the insert block 5b of the flip limiter 5. Under the action of the spring 8, the insert block 5b of the flip limiter 5 is reinserted into the slot 4a2 and limits the rotation of the seat body 4a, that is, the caster 4, that is, the trolley can be used to pull items.

[0061] like Figure 8-12 As shown, the handle 17 is provided with a sleeve 17a which is rotatably inserted into the connecting rod 3, and the connecting rod 3 is also sleeved with a limited rotation member 18, which can limit the rotation of the sleeve 17a on the connecting rod 3 through the concave-convex structure. The connecting rod 3 is also sleeved with a spring three 20, which elastically supports the concave-convex structure between the limited rotation member 18 and the sleeve 17a to fit tightly.

[0062] When the caster 4 is rotated to be stored under the transport board 1, due to the thickness of the caster 4 and at least two casters 4 are installed on one transport board 1, a storage cavity will be formed between the casters 4 under the transport board 1 after being stored, and the handle 17 can be rotated to the bottom of the transport board 1 and located in the storage cavity.

[0063] A through movable opening 1g is provided on the transport plate 1, and an acting portion 18a is provided on the rotation limiting member 18. The acting portion 18a is exposed from the movable opening 1g to the top of the transport plate 1. By pushing the acting portion 18a of the rotation limiting member 18, the rotation limiting member 18 slides on the connecting rod 3, and the rotation limiting member 18 is disengaged from the concave-convex fit between the sleeve 17a of the handle 17, so that the handle 17 can rotate on the connecting rod 3 relative to the transport plate 1.

[0064] In this embodiment, an avoidance opening 1h is provided on the transport board 1, and the avoidance opening 1h passes through the upper and lower parts and is connected with the side wall of the transport board 1, and the handle 17 also includes a telescopic rod 17b fixedly connected to the sleeve 17a. The telescopic rod 17b of the handle 17 can be rotated to the top of the transport board 1 for pushing and pulling or rotated to the bottom of the transport board 1 for storage through the avoidance opening 1h.

[0065] In the present application, the handle 17 can be rotated to the bottom of the transport plate 1, and the limit member 18 is used to limit the position of the handle 17, so that there is no need to set a storage groove for storing the handle 17 on the upper end surface of the transport plate 1. When the transported objects are placed on the transport plate 1, it can effectively avoid the situation where the transported objects are placed unevenly, so that the transported objects can be stacked normally on the transport plate 1 and pulled normally by the trolley.

[0066] like Figure 10-11As shown, the sleeve 17a of the handle 17 is provided with a plurality of recessed slots 17a1, and the slots 17a1 are distributed around the rotation axis, and the rotation limiting member 18 is provided with an insert block 18c that can be inserted into the slots 17a1 to cooperate with them. By cooperating with the insert block 18c and the slots 17a1 at different positions, the rotation angle of the handle 17 on the connecting rod 3 can be limited, that is, the inclination of the handle 17 relative to the transport plate 1 can be limited.

[0067] In order to prevent the rotation limiter 18 from rotating on the connecting rod 3, a slide groove 18b is provided on the rotation limiter 18, and a limit pin 19 inserted into the slide groove 18b is fixed on the connecting rod 3. When the rotation limiter 18 slides along the connecting rod 3, the limit pin 19 limits the rotation of the rotation limiter 18 on the connecting member and limits the sliding stroke of the rotation limiter 18 on the connecting rod 3.

[0068] In other embodiments, the rotation limiting member 18 cooperates with the connecting rod 3 in a non-circular structure such as an elliptical or polygonal structure to limit the rotation of the rotation limiting member 18 on the connecting rod 3 .

[0069] like Figure 11-12 As shown, there are two rotation-limiting members 18 sleeved on the connecting rod 3 and located between the two sleeves 17a of the handle 17, and the spring three 20 sleeved on the connecting rod 3 and located between the two rotation-limiting members 18. Preferably, the spring three 20 can also be a tension spring, a rubber band or other accessories.

[0070] In order to prevent the two sleeves 17a of the handle 17 from sliding when the rotation limiter 18 slides on the connecting rod 3, two retaining walls 1j are provided under the transport plate 1, and the two rotating sleeves on the handle 17 are located between the two retaining walls 1j. At the same time, in order to prevent the sleeve 17a of the handle 17 from rubbing against the retaining wall 1j when rotating, the connecting rod 3 is also provided with a spacer three 21, and the spacer three 21 is located between the sleeve 17a and the retaining wall 1j.

[0071] In other embodiments, the rotation limiter 18 may be disposed between the second retaining wall 1j and the sleeve 17a or between the third spacer 21 and the sleeve 17a, and the spring third 20 may be disposed between the second retaining wall 1j and the rotation limiter 18 or between the third spacer 21 and the rotation limiter 18.

[0072] Because the height of the trolley transport board 1 is relatively low, in order to prevent mud and water on the ground from splashing between the rotation limiter 18 and the sleeve 17a when the trolley is rolled and pulled by wheels, a baffle 22 is provided under the connecting rod 3, and the baffle and the transport board 1 are fixedly connected by screws and nuts.

[0073] like Fig.10As shown, the upper end surface of the transport plate 1 is provided with a plurality of countersunk holes 1i, the nuts of the screws fixedly connected to the connecting rod 3 are located in the countersunk holes 1i, and the screws and the connecting rod 3 are threadedly connected; or the screws and nuts cooperate to fix the transport plate 1 and the connecting rod 3, the nuts or nuts of the screws are located in the countersunk holes 1i, and the nuts of the screws and the nuts are clamped together to fix the transport plate 1 and the connecting rod 3.

[0074] To facilitate the installation of the casters 4, flip limiter 5, rotation limiter 18, handle 17 sleeve 17a, etc. on the connecting rod 3, in this embodiment, two connecting rods 3 are fixed on a transport board 1. The connecting rods 3 can adopt an L-shaped structure, and two casters 4 are usually installed in a group of transport board components. Preferably, the connecting rods 3 can also adopt a straight-line structure or other structures.

[0075] In this embodiment, a fitting member 23 is provided on the telescopic rod 17b of the handle 17. When the handle 17 is rotated into the storage cavity, the fitting member 23 can fit on the shifting portion 1e. Preferably, the fitting member 23 can be made of soft elastic cotton wool or silicone.

[0076] Embodiment 2

[0077] like Figure 13-17 As shown, the structure is different from that of Example 1 in that two groups of transport board assemblies are provided, and the two groups of transport board assemblies are rotatably connected, the handle 17 is installed on the connecting rod 3 of one group of transport board assemblies, and the connecting rod 3 in one group of transport board assemblies is installed with a hinge 1 24 and a hinge 2 25, the hinge 1 24 and the hinge 2 25 are arranged on the same side as the lifting portion 1c on the transport board 1, and the two transport board assemblies are rotatably connected through two groups of hinge 1 24 and hinge 2 25. Preferably, hinge 1 24 and hinge 2 25 can withstand a force of more than 200KG.

[0078] In this embodiment, hinge part 1 24 and hinge part 25 are each provided with an insertion section inserted into the connecting rod 3, and the screws fixing the connecting rod 3 pass through the transport plate 1 and the insertion section to fix the installation, so as to prevent hinge part 1 24 or hinge part 25 from detaching from the connecting rod 3.

[0079] A hook limiter 26 is rotatably mounted on the hinge 1 24, and a hook rod 27 is provided on the hinge 25. The hook limiter 26 is provided with a hook portion 26a that can hook the hook rod 27. To ensure the stability of the hook connection between the hook portion 26a and the hook rod 27, a torsion spring 28 that elastically acts on the hook limiter 26 is also installed on the hinge 1 24.

[0080] A pressing portion 26b is also provided on the hook limiter 26. By pressing the pressing portion 26b, the hook limiter 26 can be rotated and disengaged from the hook rod 27, so that the hinge 1 24 and the hinge 2 25 can rotate, that is, the two groups of plate transport components can rotate.

[0081] When the two transport boards 1 are rotated to the horizontal unfolding state, the hook limit member 26 automatically hooks the hook rod 27 under the elastic action of the torsion spring 28, and the hook limit member 26 automatically locks the hinge 1 24 and the hinge 2 25 to limit the rotation of the two transport boards 1. The two transport boards 1 are provided with an end face fitting limit at one end of the lifting portion 1c to ensure the horizontal unfolding distribution of the two transport boards 1. At this time, the lifting portions 1c on the two transport boards 1 are adjacent or close to each other, and the handles 2 of the two transport board assemblies can realize the rotation and storage of the casters 4 in the two groups of transport board assemblies through the meshing action. When the two transport boards 1 are relatively rotated and flipped down to fit together, the handle 17 rotated to the bottom of one transport board 1 for storage is located between the two transport boards 1, and the casters 4 rotated to the storage state are all located between the two transport boards 1.

[0082] In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "back", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, or are directions or positional relationships in which the product of the invention is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0083] The above is a detailed introduction to the pull rod carrying structure of the wheel of the trolley and the portable folding trolley provided by the present invention. Specific examples are used in this article to illustrate the principle and implementation mode of the present invention. The description of the above embodiments is only used to help understand the present invention and the core idea. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A pull rod lifting structure for a wheel of a trolley, comprising a transport plate, a connecting rod fixed on a pressure plate, a plurality of casters rotatably mounted on the connecting rod, a flip limiter slidably mounted on the connecting rod and capable of limiting the rotation of the casters on the connecting rod, and a spring 1 elastically acting on the flip limiter; The caster comprises a wheel frame rotatably mounted on a connecting rod, the flip limiter and the wheel frame are limited by a concave-convex structure, and the flip limiter and the concave-convex structure between the wheel frame are elastically acted on by the spring, and the flip limiter can limit the wheel frame to be used vertically for transporting a board or to be stored in close contact with the transporting board; It is characterized in that The transport plate is provided with a lifting part, a handle is slidably installed at the lifting part or on the transport plate, and two springs with elastic action are provided between the lifting part and the handle, a pull rod is connected between the handle and the flip limiter, the pull rod rotatably connects the handle and the flip limiter, and the caster includes a torsion spring that can act on the caster to rotate and store; The lifting part and the handle are kneaded, and the handle can pull the flip limiter away from the wheel frame through the pull rod, and the torsion spring can act on the caster to rotate and fit under the transport board.

2. The pull rod lifting structure of the wheel of the trolley according to claim 1, characterized in that: An adsorption component is fixed below the transport plate, and the adsorption component can be adsorbed and connected to the caster through magnetic attraction.

3. The pull rod lifting structure of the wheel of the trolley according to claim 1, characterized in that: The transport plate is provided with an operating opening for inserting a hand, a horizontal bar which fits the lifting part is fixed below the transport plate, and the handle is slidably inserted between the lifting part and the horizontal bar and exposed in the operating opening.

4. A portable folding trolley, characterized in that: It comprises a group of pull rod lifting structures for wheel of a trolley as described in any one of claims 1 to 3, wherein the connecting rod is provided with a handle for pushing or pulling the trolley.

5. The portable folding trolley according to claim 4, characterized in that: When the casters are rotated and fitted under the transport board, a storage cavity is formed between the plurality of casters, and the handle is rotatably installed and can be rotated into the storage cavity.

6. The portable folding trolley according to claim 5, characterized in that: A limited rotation part is slidably installed on the connecting rod, and the limited rotation part can limit the rotation angle of the handle on the connecting rod through the cooperation of the concave and convex structure, and a spring three is provided to elastically fit the limited rotation part to the handle.

7. A portable folding trolley, characterized in that: The pull rod lifting structure comprises two sets of wheel trolleys as described in any one of claims 1 to 3, which are rotatably arranged between adjacent transport boards. When adjacent transport boards are horizontally unfolded, the end faces between the transport boards are fitted and limited to restrict the turning of the two transport boards, and the connecting rod is provided with a handle for pushing and pulling the trolley.

8. The portable folding trolley according to claim 7, characterized in that: When the casters are rotated and fitted under the transport board, a storage cavity is formed between the multiple casters, and two adjacent transport boards can be rotated, turned down and fitted together. The handle is rotatably installed, and the handle can be rotated between the two transport boards and located in the storage cavity.

9. The portable folding trolley according to claim 8, characterized in that: A limited rotation part is slidably installed on the connecting rod, and the limited rotation part can limit the rotation angle of the handle on the connecting rod through the cooperation of the concave and convex structure, and a spring three is provided to elastically fit the limited rotation part to the handle.

10. The portable folding trolley according to claim 7, characterized in that: A hooking limiter is rotatably mounted on the transport plate, and the hooking limiter can hook and limit the relative rotation of the two transport plates.

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