A multifunctional folding trolley

Abstract

The present application discloses a multifunctional folding trolley, which comprises a bearing part, a pushing and pulling part and a trundle part, and an opening positioning device for clamping the pushing and pulling part in an open state, wherein the bearing part comprises a bearing frame and a bearing plate connected with each other, the pushing and pulling part comprises a pushing and pulling handle seat and a pushing and pulling handle, the pushing and pulling handle seat is pivoted with the bearing part through a pivot shaft, the pushing and pulling handle seat is provided with a sliding channel, a supporting rod of the pushing and pulling handle is inserted into the sliding channel and can slide relative to the pushing and pulling handle seat, the pushing and pulling handle seat is provided with a first locking mechanism capable of locking the sliding of the pushing and pulling handle relative to the pushing and pulling handle seat, and when the pushing and pulling handle seat rotates relative to the bearing part, the pushing and pulling handle can be switched between a first position relative to the bearing plate horizontally and a second position relative to the bearing plate vertically. The present application has the advantages that whether the bearing plate is provided with an object or not, the opening and position switching of the pushing and pulling handle will not be affected, and the whole trolley can be unfolded quickly and conveniently.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of trolleys, and more particularly to a multifunctional folding trolley. BACKGROUND

[0002] A trolley is a carrying vehicle that is pushed or pulled by manpower, and can work in places where motor vehicles are not convenient to use, and is very convenient when carrying light objects over a short distance.

[0003] The folding trolleys sold on the market include a load-bearing plate, casters and a push handle, the casters are arranged on the bottom surface of the load-bearing plate, and the push handle is arranged on the top surface of the load-bearing plate, the push handle is placed in parallel against the top surface of the load-bearing plate when being folded, and the push handle is placed in parallel and is higher than the top surface of the load-bearing plate in some cases, and the push handle is flush with the top surface of the load-bearing plate by arranging a storage groove on the load-bearing plate in some cases, and for the folding trolley of this type, if a shopping basket or the like is placed on the load-bearing plate when the push handle is folded, the shopping basket or the like needs to be removed first when the push handle is turned open, which is inconvenient to use.

[0004] For example, a Chinese utility model patent with the publication number CN218055236U and the title of lightweight folding trolley includes a bottom plate and a push handle, the upper surface of the bottom plate is integrally extended upward to be provided with a push handle connecting portion, the push handle is connected to the push handle connecting portion, a folding limiting mechanism for limiting rotation of the push handle is arranged between the push handle and the push handle connecting portion, the folding limiting mechanism includes a limiting rod and a tension spring, the limiting rod is slidingly connected to the push handle connecting portion and can be switched between a locking stop position and an unlocking stop position, the tension spring always gives the limiting rod a force for sliding to the locking stop position, the bottom of the bottom plate is integrally extended downward to be provided with a front wheel connecting portion, the front wheels of the trolley are rotationally connected to the front wheel connecting portion, and the bottom plate is further provided with a universal wheel. The technical solution disclosed above, when the push handle is folded, a shopping basket or the like cannot be well placed on the bottom plate, even if it can be placed, the shopping basket or the like needs to be removed first when the push handle is turned open, otherwise it will be blocked by the shopping basket or the like and cannot be opened, which is inconvenient to use. SUMMARY

[0005] The present application aims to solve the above-mentioned problems, and provides a multifunctional folding trolley that does not affect the opening of the push handle when a shopping basket or the like is placed on the load-bearing plate.

[0006] The present application is implemented by the following technical solutions.

[0007] The present application provides a multifunctional folding trolley, comprising a bearing part, a pushing and pulling part and a caster part, and an opening positioning device for locking the pushing and pulling part in the open state, wherein the bearing part comprises a bearing frame and a bearing plate connected to each other, the pushing and pulling part comprises a pushing and pulling handle seat and a pushing and pulling handle, the pushing and pulling handle seat is pivoted to the bearing part through a pivot shaft, the pushing and pulling handle seat is provided with a sliding channel, a supporting rod of the pushing and pulling handle is inserted into the sliding channel and can slide relative to the pushing and pulling handle seat, the pushing and pulling handle seat is provided with a first locking mechanism capable of locking the sliding of the pushing and pulling handle relative to the pushing and pulling handle seat, and when the pushing and pulling handle seat rotates relative to the bearing part, the pushing and pulling handle can be switched between a first position relative to the bearing part in a horizontal state and a second position relative to the bearing part in a vertical state, and when the pushing and pulling handle is located at the first position relative to the bearing part in the horizontal state, the supporting rod can slide along the sliding channel to a space below the top surface of the bearing plate.

[0008] In the above technical solution, the pushing and pulling handle and the existing pushing and pulling handle are different in the opening mode relative to the bearing plate, the pushing and pulling handle of the present application is first pulled out to the first position in the horizontal state through the pulling mode, the bottom end of the pushing and pulling handle is separated from the bearing part, and then the pushing and pulling handle is flipped to the second position relative to the bearing plate in the vertical state through the rotating mode of the pushing and pulling handle seat, in the process of switching the pushing and pulling handle from the first position to the second position or from the second position to the first position, whether there is an object on the bearing plate or not, the opening and the position switching of the pushing and pulling handle will not be affected, and when the pushing and pulling handle seat is rotated to the second position relative to the bearing plate in the vertical state, the opening positioning device will lock the pushing and pulling part to maintain the vertical state of the pushing and pulling handle relative to the bearing plate, which is very convenient to use, and is especially suitable for being matched with a shopping basket.

[0009] Preferably, the caster part comprises a caster assembly and a caster connecting rod connecting two or more caster assemblies, the caster connecting rod is rotationally connected to the bearing frame, the caster assembly comprises a caster, a caster frame and a caster sleeve, the caster is rotationally installed on the caster frame, the caster frame is fixed to the caster sleeve, and the caster sleeve is fixed on the caster connecting rod. In the present technical solution, the caster connecting rod is rotationally connected to the bearing frame, the caster assembly can rotate with the caster connecting rod, and the caster assembly can be switched between the parallel folding state and the vertical walking state relative to the bearing part, which facilitates the folding and storage of the trolley body and the unfolding and use of the trolley body.

[0010] Preferably, the caster connecting rod is rotatably connected with the bearing frame through a connecting sleeve, the connecting sleeve is sleeved on the caster connecting rod, the caster connecting rod can rotate relative to the connecting sleeve, the connecting sleeve comprises a first connecting part and a second connecting part, the first connecting part is fixedly connected with the bearing frame, and the second connecting part is fixedly connected with the bearing plate, and the caster connecting rod is connected with the push-pull handle seat through a linkage device. In this way, the caster part is firmly and reliably connected with the bearing part, and the linkage device can also be used to synchronize the opening and folding of the push-pull handle seat, and the folding and unfolding of the caster part is quick and convenient.

[0011] Preferably, the opening positioning device comprises two fixed rods, a button connecting rod, an operation button, a lock seat connecting rod, a lock seat, a lock seat spring and a lock pin, the button connecting rod is arranged between and connected with the two fixed rods, the operation button is fixed on the button connecting rod, the lock seat connecting rod is connected with the two fixed rods and the end of the lock seat connecting rod extends to the outside of the fixed rods, the lock seat is fixed on the end of the lock seat connecting rod and sleeved on the caster connecting rod, the lock pin is arranged at one end of the fixed rod close to the push-pull handle seat, the push-pull handle seat is provided with a bayonet that matches the lock pin at the position corresponding to the lock pin, and the lock seat spring is sleeved on the caster connecting rod between the connecting sleeve and the lock seat to provide elastic force for the lock pin to be clamped in the bayonet. In the technical solution, the lock seat is sleeved on the caster connecting rod to realize the sliding connection of the entire opening positioning device with the caster connecting rod, when the operation button is pressed, the entire opening positioning device can slide relative to the caster connecting rod to make the lock pin disengage from the bayonet, thereby realizing the unlocking of the push-pull handle seat and the opening positioning device, and after the applied force on the operation button is removed, the entire opening positioning device can be reset under the elastic force of the lock seat spring, and the lock pin can be clamped in the bayonet to lock the push-pull handle seat.

[0012] Preferably, the lock seat is provided with a plug pin at the end face facing the caster sleeve, the caster sleeve is provided with a plug groove that matches the plug pin at the end face facing the lock seat, and the plug pin is arranged to be clamped in the plug groove when the caster is rotated and opened to the upright position relative to the bearing part. In the technical solution, the caster is rotated and opened to the upright position relative to the bearing part, which corresponds to the push-pull handle seat being rotated to the second position in which the push-pull handle is upright relative to the bearing part, that is, when the lock pin is clamped in the bayonet to lock the push-pull handle seat, the plug pin and the plug groove cooperate to lock the caster sleeve to prevent the caster part from being folded relative to the bearing part, so that the upright walking state of the caster part relative to the bearing part and the upright opening state of the push-pull part relative to the bearing part can be better maintained.

[0013] Preferably, the front end of the bearing frame is provided with a fixing base connected with the bearing plate, the fixing base comprises an inner end face and an outer end face, the pivot shaft passes through the fixing base from the outer end face of the fixing base and is pivotally connected with the push-pull handle base at the rear of the bearing frame, the push-pull handle base is provided with a metal lock plate at the position corresponding to the inner end face of the fixing base, the bayonet is arranged on the metal lock plate, and the bayonet is arranged to be matched and locked with the lock pin when the push-pull handle is located at the second position. In this way, the connection strength of the bearing frame and the bearing plate can be enhanced, and the bearing frame and the push-pull handle base are conveniently pivotally connected, and the bayonet arranged on the metal lock plate can ensure the strength of the bayonet.

[0014] Preferably, the linkage device comprises a first matching part and a second matching part, the first matching part and the second matching part are toothed plates that are engaged with each other, the toothed plate of the first matching part is arranged at the position of the outer end face of the fixing base via the pivot shaft, and the toothed plate of the first matching part is connected and fixed with the push-pull handle base through two connecting pins coaxially arranged with the pivot shaft, and the toothed plate of the second matching part is arranged at the end face of the caster sleeve. In this way, when the push-pull handle base is rotated, the toothed plate of the first matching part connected and fixed with the push-pull handle base can drive the toothed plate of the second matching part to rotate, so as to realize the synchronous opening and folding of the push-pull handle base and the caster part.

[0015] Preferably, the push-pull handle base is provided with a rotating sleeve in the sliding channel, the rotating sleeve is rotatably connected with the push-pull handle base through a pin at a position deviated from the center of the rotating sleeve, and the supporting rod is inserted and arranged in the rotating sleeve and can slide relative to the rotating sleeve. In the technical solution, after the push-pull handle is slid relative to the push-pull handle base to the fully opened position, the push-pull handle can be rotated relative to the push-pull handle base through the rotating sleeve, that is, the push-pull handle can swing between the first position and the second position, and the drag mode can be converted.

[0016] Preferably, the first locking mechanism comprises a first button, a first lock block and a first spring, the first button is provided with driving pins at the left and right ends, the first lock block is provided with a guide sliding groove matched with the driving pins and a lock pin for locking the push-pull handle, the number of the first lock blocks is two, and the two first lock blocks are respectively arranged at the left and right ends of the first button, when the first button is pressed, the driving pins matched with the guide sliding groove can make the two first lock blocks close to each other, the first spring arranged at the bottom of the first button provides elastic force for the reset of the first button, the rotating sleeve is provided with a relief hole for accommodating the lock pin at the position corresponding to the lock pin, the first lock hole and the second lock hole are arranged on the supporting rod, when the first lock hole is matched and locked with the lock pin, the push-pull handle is slid to the fully closed position relative to the push-pull handle seat, when the second lock hole is matched and locked with the lock pin, the push-pull handle is slid to the fully open position relative to the push-pull handle seat. In this way, when the push-pull handle is slid to the fully open position relative to the push-pull handle seat, the lock pin is inserted in the relief hole and the second lock hole, the rotating sleeve cannot be rotated relative to the push-pull handle seat, and the push-pull handle is in the second position of the normal relative carrying part standing, at this time, the first button is pressed to make the lock pin disengage from the second lock hole and the relief hole, and then the rotating sleeve can be rotated around the pin as the rotating shaft, that is, the push-pull handle can be rotated to be converted into the pullable form, even if the first button is released, because the lock pin is not aligned with the relief hole but is against the side wall of the rotating sleeve, the rotating sleeve can still be rotated.

[0017] Preferably, the top edge of the load-bearing plate is provided with a surrounding edge which is higher than the top surface of the load-bearing plate, and the side surface of the load-bearing plate is provided with a lock buckle. In this way, the shopping basket can be conveniently placed and fixed.

[0018] The application has the advantages that whether the load-bearing plate is loaded with objects or not, the opening and position conversion of the push-pull handle are not affected, when the push-pull part is converted from the first position to the second position, the caster part can be simultaneously converted from the closed state to the upright walking state, the whole trolley is unfolded quickly and conveniently, the opening positioning device can lock the push-pull handle seat and the caster part at the same time, the stability is good, and when the trolley is running, it can ensure that the caster part will not be accidentally closed, the push-pull handle can be rotated relative to the push-pull handle seat through the rotating sleeve, and can be converted into the pullable form, and the applicability is better. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 The structure schematic view of the application in the bottom direction without the lower cover plate.

[0020] Figure 2 The structure schematic view of the application in the bottom direction.

[0021] Figure 3 The structure schematic view of the application when the load-bearing plate and the lower cover plate are omitted and the push-pull handle is slid to the fully open state.

[0022] Figure 4 Structure diagram of the push-pull handle seat turning from the first position to the second position when the load-bearing plate and the lower cover plate are omitted.

[0023] Figure 5 Structure diagram of the push-pull handle seat turning from the first position to the second position when the load-bearing plate and the lower cover plate are omitted.

[0024] Figure 6 Structure diagram of the push-pull handle seat turning from the first position to the second position when the load-bearing plate and the lower cover plate are omitted.

[0025] Figure 7 Structure diagram of the push-pull handle seat turning from the first position to the second position when the load-bearing plate and the lower cover plate are omitted.

[0026] Figure 8 Structure diagram of the push-pull handle seat turning from the first position to the second position when the load-bearing plate and the lower cover plate are omitted.

[0027] Figure 9 Structure diagram of the push-pull handle seat turning from the first position to the second position when the load-bearing plate and the lower cover plate are omitted.

[0028] Figure 10 Structure diagram of the push-pull handle seat turning from the first position to the second position when the load-bearing plate and the lower cover plate are omitted.

[0029] Figure 11 Structure diagram of the push-pull handle seat turning from the first position to the second position when the load-bearing plate and the lower cover plate are omitted.

[0030] Figure 12 Structure diagram of the push-pull handle seat turning from the first position to the second position when the load-bearing plate and the lower cover plate are omitted.

[0031] Figure 13 Structure diagram of the push-pull handle seat turning from the first position to the second position when the load-bearing plate and the lower cover plate are omitted. Figure 12 Structure diagram of the push-pull handle seat turning from the first position to the second position when the load-bearing plate and the lower cover plate are omitted.

[0032] Figure 14 Structure diagram of the push-pull handle seat turning from the first position to the second position when the load-bearing plate and the lower cover plate are omitted.

[0033] Figure 15 Structure diagram of the push-pull handle seat turning from the first position to the second position when the load-bearing plate and the lower cover plate are omitted.

[0034] Figure 16 Structure diagram of the push-pull handle seat turning from the first position to the second position when the load-bearing plate and the lower cover plate are omitted.

[0035] Figure 17 Structure diagram of the push-pull handle seat turning from the first position to the second position when the load-bearing plate and the lower cover plate are omitted.

[0036] Figure 18 Structure diagram of the push-pull handle seat turning from the first position to the second position when the load-bearing plate and the lower cover plate are omitted.

[0037] Figure 19 Structure diagram of the push-pull handle seat turning from the first position to the second position when the load-bearing plate and the lower cover plate are omitted.

[0038] Figure 20 Fig. 1 is a schematic view of the overall structure of the present application with the push-pull handle in the first position and containing a shopping basket.

[0039] Figure 21 Fig. 2 is a schematic view of the overall structure of the present application with the push-pull handle in the second position and containing a shopping basket. DETAILED DESCRIPTION

[0040] The present application will be further described below in conjunction with the accompanying drawings. The drawings are only for illustrative purposes and should not be construed as limiting the patent.

[0041] In order to more concisely describe the present embodiment, some parts that are well known to those skilled in the art but are not directly related to the main content of the present creation will be omitted in the drawings or description. In addition, some parts will be omitted, enlarged or reduced in the drawings for the convenience of description, but this does not represent the actual product size or the entire structure.

[0042] Embodiment 1

[0043] The multifunctional folding trolley of the present embodiment comprises a bearing part, a push-pull part and a caster part, and an opening positioning device 9 for clamping the push-pull part in the open state. As shown in Figure 1 and Figure 2 The bearing part comprises a bearing frame 2 and a bearing plate 1 connected together, and the bottom of the bearing plate 1 is connected with a lower cover plate 15. The lower cover plate 15 serves to encapsulate the bearing frame 2, the opening positioning device 9, etc., thereby enhancing the connection strength and dustproof effect of the overall product.

[0044] As shown in Figures 1 to 6As shown, the push-pull part comprises a push-pull handle seat 3 and a push-pull handle 4, the push-pull handle seat 3 is pivoted to the bearing part through a pivot shaft 5, the push-pull handle seat 3 is provided with a sliding channel 31, the push-pull handle 4 comprises two parallelly arranged supporting rods 41 and a cross rod 43 arranged at the top of the supporting rods 41 to connect the two supporting rods 41 together. The supporting rods 41 of the push-pull handle 4 are inserted into the sliding channel 31 and can slide relative to the push-pull handle seat 3, the push-pull handle seat 3 is provided with a first locking mechanism 6 capable of locking the push-pull handle 4 from sliding relative to the push-pull handle seat 3, when the push-pull handle seat 3 rotates relative to the bearing part, the push-pull handle 4 can be switched between a first position relative to the bearing part horizontally and a second position relative to the bearing part vertically, when the push-pull handle 4 is in the first position relative to the bearing part horizontally, the supporting rods 41 can slide along the sliding channel 31 and be accommodated in the space at the bottom of the bearing plate 1, i.e. the space enclosed by the bearing plate 1 and the lower cover plate 15. When it is needed to switch the push-pull handle 4 to the second position relative to the bearing part vertically, the first locking mechanism 6 is operated first to unlock the push-pull handle 4 from the push-pull handle seat 3, then the push-pull handle 4 is pulled out horizontally at the first position until the bottom end of the supporting rods 41 abuts against the push-pull handle seat 3 and cannot be pulled out any more, at this time, the first locking mechanism 6 will automatically lock the push-pull handle 4 from the push-pull handle seat 3, finally, the push-pull handle seat 3 is rotated 90 degrees around the pivot shaft 5 to complete the switching.

[0045] In the embodiment, as shown in Figure 7 and Figure 8 , the caster part comprises caster assemblies and caster connecting rods 7 connecting the two caster assemblies, wherein the number of the caster connecting rods 7 is two, the two caster connecting rods 7 are arranged in parallel at intervals, and each caster connecting rod 7 is connected with two caster assemblies. The caster assembly comprises a caster 71, a caster frame 72 and a caster sleeve 73, the caster 71 is rotatably installed on the caster frame 72, the caster frame 72 is fixed with the caster sleeve 73, the caster sleeve 73 is sleeved on the caster connecting rod 7 to be fixed, the caster connecting rod 7 is rotatably connected with the bearing frame 2 through a connecting sleeve 8, the connecting sleeve 8 is sleeved on the caster connecting rod 7, the caster connecting rod 7 can rotate relative to the connecting sleeve 8, the connecting sleeve 8 comprises a first connecting part 81 and a second connecting part 82, the first connecting part 81 is fixedly connected with the bearing frame 2, and the second connecting part 82 is fixedly connected with the bearing plate 1.

[0046] In the embodiment, as shown in Figure 7 , Figure 9 and Figure 10As shown, the opening positioning device 9 includes two fixed rods 91, a button connecting rod 92, an operating button 93, two lock seat connecting rods 94, four lock seats 95, lock seat springs 96 and lock pins 97. The two fixed rods 91 are arranged in parallel at intervals. The button connecting rod 92 is arranged between the front ends of the two fixed rods 91 and connected with the fixed rods 91. The operating button 93 is fixed at the middle part of the button connecting rod 92. In order to facilitate the operation of the operating button 93, the push-pull handle seat 3 is provided with a space for avoiding the operating button 93 at the position corresponding to the operating button 93. The two lock seat connecting rods 94 are arranged at the front and rear positions of the fixed rods 91 and connected with the fixed rods 91, and the ends of the lock seat connecting rods 94 extend to the outside of the fixed rods 91. The four lock seats 95 are fixed at the four ends of the two lock seat connecting rods 94 and sleeved on the caster connecting rod 7. The lock pins 97 are arranged at the front ends of the fixed rods 91, i.e. the ends close to the push-pull handle seat 3. The push-pull handle seat 3 is provided with a bayonet 321 matched with the lock pin 97 at the position corresponding to the lock pin 97. Figure 10 As shown, the lock seat springs 96 are sleeved on the caster connecting rod 7 between the connecting sleeve 8 at the upper part of the caster connecting rod 7 and the lock seats 95, and provide elastic force for the lock pin 97 to be clamped in the bayonet 321.

[0047] As a further improvement, as shown, Figure 11 The lock seat 95 is integrally formed with a plug 951 at the end surface facing the caster sleeve 73. The caster sleeve 73 is provided with a slot 731 matched with the plug 951 at the end surface facing the lock seat 95. The plug 951 can be clamped in the slot 731 when the caster 71 is turned to the upright position relative to the bearing part.

[0048] In this embodiment, as shown, Figures 12 to 15 The front end of the bearing frame 2 is provided with a fixed seat 21. The fixed seat 21 is provided with a vertical connecting part 213. The fixed seat 21 is connected and fixed with the bearing plate 1 and the lower cover plate 15 through the screw penetrating through the vertical connecting part 213. The side of the fixed seat 21 facing the caster connecting rod 7 is also provided with a circular blind hole 214 for inserting the end of the caster connecting rod 7, so as to axially limit the caster connecting rod 7. The fixed seat 21 includes an inner end surface 211 and an outer end surface 212. The pivot shaft 5 penetrates through the fixed seat 21 and the bearing frame 2 from the outer end surface 212 of the fixed seat 21 and is pivotally connected with the push-pull handle seat 3. Figure 15 As shown, the push-pull handle seat 3 is provided with a metal lock plate 32 at the position corresponding to the inner end surface 211 of the fixed seat 21. The bayonet 321 is arranged on the metal lock plate 32. The bayonet 321 is arranged to be matched with the lock pin 97 to be locked when the push-pull handle seat 3 is turned to the upright position relative to the bearing part with the push-pull handle 4 in the second position. The push-pull handle seat 3 at the position of the metal lock plate 32 is provided with an avoiding slot 36 for inserting the end of the fixed rod 91.

[0049] In this embodiment, as shown, Figure 16 and Figure 17As shown, the first locking mechanism 6 includes a first button 61, a first locking block 62 and a first spring 63. The first button 61 is disposed inside the push-pull handle seat 3, and its top extends out of the top of the push-pull handle seat 3. The left and right ends of the first button 61 are provided with drive pins 611. The first locking block 62 is provided with an inclined guide groove 621 that cooperates with the drive pin 611, and a locking pin 622 for locking the push-pull handle 4. There are two first locking blocks 62, which are respectively located at the left and right ends of the first button 61. The guide grooves 621 of the two first locking blocks 62 form a figure-eight-shaped layout. When the first button 61 is pressed, the drive pin 611 cooperates with the guide groove 621 to bring the two first locking blocks 62 closer to each other so that the locking pin 622 disengages from the support rod 41. The first spring 63 is located at the bottom of the first button 61 to provide elastic force for the first button 61 to reset. Specifically, a sealing plate 34 is provided at the bottom of the push-pull handle seat 3. The top of the first spring 63 abuts against the bottom of the first button 61, and the bottom of the first spring 63 abuts against the sealing plate 34. The support rod 41 has a first locking hole 411 and a second locking hole 412 on its upper and lower inner sides, respectively. A limit plug 42 is installed at the bottom of the support rod 41. The inner side of the limit plug 42 has an insertion hole for the locking pin 622 at the position corresponding to the second locking hole 412. The limit plug 42 is designed to prevent the sliding channel 31 from passing through, thus preventing the push-pull handle 4 from disengaging from the push-pull handle seat 3. When the push-pull handle 4 slides relative to the push-pull handle seat 3 to be fully closed, the first locking hole 411 engages with the locking pin 622 to lock. When the push-pull handle 4 slides relative to the push-pull handle seat 3 to be fully open, the second locking hole 412 engages with the locking pin 622 to lock.

[0050] In this embodiment, as Figure 5 As shown, first manually open the caster to the upright walking position. Then, operate the first locking mechanism 6 to unlock the push-pull handle 4 and the push-pull handle seat 3. Pull the push-pull handle 4 horizontally out of the first position until the bottom end of the support rod 41 abuts against the push-pull handle seat 3 and cannot be pulled any further. The first locking mechanism 6 will automatically lock the push-pull handle 4 and the push-pull handle seat 3. Finally, rotate the push-pull handle seat 3 90 degrees around the pivot shaft 5 to complete the conversion. At this time, open the positioning device 9. Under the elastic force of the lock seat spring 96, the locking pin 97 will automatically engage with the slot 321 of the push-pull handle seat 3. The pin 951 of the lock seat 95 will also simultaneously engage with the slot 731 of the caster sleeve 73 to lock the push-pull handle seat 3 and the caster. When unlocking is required, press the operation button 93 to drive the locking pin 97 out of the slot 321, and the pin 951 will also disengage from the slot 731 to unlock.

[0051] Example 2

[0052] This embodiment is structurally similar to Embodiment 1, the difference being that, as Figure 12 , Figure 13 , Figure 16and Figure 17 As shown in the figure, in this embodiment, the caster connecting rod 7 is connected with the push-pull handle seat 3 through a linkage device, the linkage device includes a first matching part and a second matching part, the first matching part and the second matching part are interlocking tooth plates 35 and 74, the tooth plate 35 of the first matching part is arranged at the position of the outer end surface 212 of the fixed seat 21 and passes through the pivot shaft 5, and the tooth plate 35 of the first matching part is connected and fixed with the push-pull handle seat 3 through two connecting nails coaxially arranged with the pivot shaft 5, so that the tooth plate 35 of the first matching part rotates synchronously with the push-pull handle seat 3, and the tooth plate 74 of the second matching part is arranged at the end surface of the caster sleeve 73 and is fixed with the caster sleeve 73.

[0053] In this way, when the push-pull handle seat 3 rotates, the tooth plate 35 of the first matching part fixedly connected with the push-pull handle seat 3 can drive the tooth plate 74 of the second matching part to rotate the caster part, so as to realize the synchronous opening and folding of the push-pull handle seat 3 and the caster part.

[0054] Embodiment 3

[0055] The embodiment is similar to the structure of embodiment 2, and the difference lies in that, as shown in the figure, Figures 16 to 19 In this embodiment, the push-pull handle seat 3 is provided with a rotating sleeve 33 in the sliding channel 31, the rotating sleeve 33 is rotatably connected with the push-pull handle seat 3 at a position deviating from the center through a pin 332, the supporting rod 41 is inserted and arranged in the rotating sleeve 33 and can slide relative to the rotating sleeve 33, and the rotating sleeve 33 is provided with a relief hole 331 through which the lock pin 622 passes at a position corresponding to the lock pin 622. In this way, when the push-pull handle 4 slides relative to the push-pull handle seat 3 to the fully open position, the lock pin 622 is inserted in the relief hole 331 and the second lock hole 412, and the rotating sleeve 33 cannot rotate relative to the push-pull handle seat 3, and the push-pull handle 4 is in the normal second position of being upright relative to the bearing plate 1. At this time, after the first button 61 is pressed to make the lock pin 622 disengage from the second lock hole 412 and the relief hole 331, the rotating sleeve 33 can rotate around the pin 332 as the rotation axis, so as to rotate the push-pull handle 4 to convert it into a drag form. Even if the first button 61 is released, because the lock pin 622 does not align with the relief hole 331 but abuts against the side wall of the rotating sleeve 33, the rotating sleeve 33 can still rotate.

[0056] In order to make the push-pull handle adapt to people of various heights and provide a comfortable experience, the supporting rod 41 is further embedded with an extension rod 44 which can extend and retract relative to the supporting rod 41, and the cross rod 43 is arranged at the top end of the extension rod 44 to connect the two extension rods 44 together.

[0057] Embodiment 4

[0058] The embodiment is similar to the structure of embodiment 3, and the difference lies in that, as shown in the figure, Figures 18 to 21As shown, in the embodiment, the top edge of the load-bearing plate 1 is provided with a surrounding edge 11 higher than the top surface of the load-bearing plate 1, the side surface of the load-bearing plate 1 is provided with a lock 12 for fixing the shopping basket 16, the top surface of the load-bearing plate 1 is provided with a receiving groove 14 at the end away from the push-pull handle 4, the receiving groove 14 is hinged with a baffle 13, the baffle 13 can be horizontally received in the receiving groove 14 or be vertically opened relative to the load-bearing plate 1, when the load-bearing plate 1 is placed with goods, the baffle 13 can be opened to block the goods, having a certain fixing effect.

[0059] The shopping basket 16 is placed on the top surface of the load-bearing plate 1, the boss provided at the bottom of the shopping basket 16 is embedded in the top surface of the load-bearing plate 1 surrounded by the surrounding edge 11, during the travel of the trolley, the shopping basket 16 will not slide due to vibration, in addition, the shopping basket 16 is further fixed by the lock 12 provided at the side surface of the load-bearing plate 1, when the shopping basket 16 is empty and folded, the shopping basket 16 can be well fixed with the load-bearing plate 1 and will not fall off, the whole is convenient to carry, and when the trolley needs to be unfolded, the shopping basket 16 will not affect the unfolding of the push-pull part and the caster part.

[0060] The above is only a specific embodiment of the present application, but the design concept of the present application is not limited thereto, any non-essential modification of the present application by using the concept of the present application falls within the protection scope of the present application.

Claims

1. A multi-functional folding trolley, comprising a load-bearing part, a push-pull part, and casters, and an opening positioning device (9) for locking the push-pull part in the open state, wherein, The load-bearing part includes a load-bearing frame (2) and a load-bearing plate (1) connected together. The push-pull part includes a push-pull handle seat (3) and a push-pull handle (4). The push-pull handle seat (3) is pivotally connected to the load-bearing part via a pivot shaft (5). The push-pull handle seat (3) is provided with a sliding channel (31). The support rod (41) of the push-pull handle (4) is inserted in the sliding channel (31) and can slide relative to the push-pull handle seat (3). The push-pull handle seat (3) is provided with a first locking mechanism (6) that can lock the push-pull handle (4) relative to the push-pull handle seat (3). The push-pull handle seat (3) is configured such that when it rotates relative to the load-bearing part, the push-pull handle (4) can switch between a first position that is relatively horizontal relative to the load-bearing part and a second position that is relatively vertical relative to the load-bearing part. When the push-pull handle (4) is in the first position that is relatively horizontal relative to the load-bearing part, the support rod (41) can slide along the sliding channel (31) to the space where the load-bearing part is lower than the top surface of the load-bearing plate (1). The caster part includes a caster assembly and a caster connecting rod (7) connecting two or more caster assemblies. The caster connecting rod (7) is rotatably connected to the support frame (2). The caster assembly includes a caster (71), a caster frame (72), and a caster sleeve (73). The caster (71) is rotatably mounted on the caster frame (72). The caster frame (72) is fixed to the caster sleeve (73). The caster sleeve (73) is fitted onto the caster connecting rod (7) and fixed. The caster connecting rod (7) is rotatably connected to the support frame (2) through the connecting sleeve (8). The connecting sleeve (8) is fitted on the caster connecting rod (7). The caster connecting rod (7) can rotate relative to the connecting sleeve (8). The connecting sleeve (8) includes a first connecting part (81) and a second connecting part (82). The first connecting part (81) is connected and fixed to the support frame (2), and the second connecting part (82) is connected and fixed to the load-bearing plate (1). The caster connecting rod (7) is connected to the push-pull handle seat (3) through a linkage device. The opening positioning device (9) includes a fixed rod (91), a button connecting rod (92), an operation button (93), a lock seat connecting rod (94), a lock seat (95), a lock seat spring (96), and a lock pin (97). There are two fixed rods (91). The button connecting rod (92) is located between the two fixed rods (91) and connected to the fixed rods (91). The operation button (93) is fixed on the button connecting rod (92). The lock seat connecting rod (94) is connected to the two fixed rods (91), and the end of the lock seat connecting rod (94) is... Extending to the outside of the fixed rod (91), the lock seat (95) is fixed to the end of the lock seat connecting rod (94) and fitted onto the caster connecting rod (7). The lock pin (97) is located at one end of the fixed rod (91) near the push-pull handle seat (3). The push-pull handle seat (3) has a slot (321) at the position corresponding to the lock pin (97) to cooperate with the lock pin (97). The lock seat spring (96) is fitted onto the caster connecting rod (7) and located between the connecting sleeve (8) and the lock seat (95) to provide elastic force for the lock pin (97) to be engaged in the slot (321).

2. The multifunctional folding handcart according to claim 1, characterized in that, The lock seat (95) has a pin (951) on the end face facing the caster sleeve (73), and the caster sleeve (73) has a slot (731) on the end face facing the lock seat (95) that engages with the pin (951). The pin (951) is configured to engage in the slot (731) when the caster (71) is rotated open to the upright position relative to the bearing part.

3. The multifunctional folding handcart according to claim 2, characterized in that, The front end of the support frame (2) is provided with a fixed seat (21), which is connected and fixed to the load-bearing plate (1). The fixed seat (21) includes an inner end face (211) and an outer end face (212). The pivot shaft (5) passes through the outer end face (212) of the fixed seat (21) and the support frame (2) and is pivotally connected to the push-pull handle seat (3). The push-pull handle seat (3) is provided with a metal locking plate (32) at the position corresponding to the inner end face (211) of the fixed seat (21). The bayonet (321) is provided on the metal locking plate (32). The bayonet (321) is configured to cooperate with the locking pin (97) to lock when the push-pull handle (4) is in the second position.

4. The multi-functional folding handcart according to claim 3, characterized in that, The linkage device includes a first mating part and a second mating part. The first mating part and the second mating part are meshing toothed pieces (35, 74). The toothed piece (35) of the first mating part is located on the outer end face (212) of the fixed seat (21) and passes through the pivot shaft (5). The toothed piece (35) of the first mating part is connected and fixed to the push-pull handle seat (3) by two connecting pins arranged in the same direction as the pivot shaft (5). The toothed piece (74) of the second mating part is located on the end face of the caster sleeve (73).

5. The multi-functional folding handcart according to any one of claims 1 to 4, characterized in that, The push-pull handle seat (3) has a rotating sleeve (33) in the sliding channel (31). The rotating sleeve (33) is rotatably connected to the push-pull handle seat (3) by a pin (332) at a position off-center. The support rod (41) is inserted in the rotating sleeve (33) and can slide relative to the rotating sleeve (33).

6. The multi-functional folding handcart according to claim 5, characterized in that, The first locking mechanism (6) includes a first button (61), a first locking block (62), and a first spring (63). The first button (61) has a drive pin (611) at its left and right ends. The first locking block (62) has a guide groove (621) that cooperates with the drive pin (611) and a locking pin (622) for locking the push-pull handle (4). There are two first locking blocks (62), which are respectively located at the left and right ends of the first button (61). When the first button (61) is pressed, the drive pin (611) cooperates with the guide groove (621) to bring the two first locking blocks (62) closer to each other. The first spring (63) is located at the bottom of the first button (61) to provide elastic force for the first button (61) to reset. The rotating sleeve (33) is provided with a clearance hole (331) at the position corresponding to the locking pin (622) to allow the locking pin (622) to pass through. The support rod (41) is provided with a first locking hole (411) and a second locking hole (412). When the first locking hole (411) is engaged with the locking pin (622) to lock, the push-pull handle (4) slides relative to the push-pull handle seat (3) to the fully closed position. When the second locking hole (412) is engaged with the locking pin (622) to lock, the push-pull handle (4) slides relative to the push-pull handle seat (3) to the fully open position.

7. The multi-functional folding handcart according to claim 1, characterized in that, The top edge of the load-bearing plate (1) is provided with a rim (11) that is higher than the top surface of the load-bearing plate (1), and the side of the load-bearing plate (1) is provided with a latch (12).

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