Multifunctional folding hand truck

Abstract

A multifunctional folding hand truck, comprising a carrying portion, a push-pull portion, a caster portion, and a deploying and positioning apparatus (9) for locking the push-pull portion when in a deployed state. The carrying portion comprises a carrying frame (2) and a bearing plate (1) connected to each other. The push-pull portion comprises a push-pull handle base (3) and a push-pull handle (4); the push-pull handle base (3) is pivotably connected to the carrying portion by means of a pivot shaft (5); slide channels (31) are formed in the push-pull handle base (3); support rods (41) of the push-pull handle (4) are inserted into the slide channels (31) and can slide relative to the push-pull handle base (3); the push-pull handle base (3) is provided with a first locking mechanism (6) capable of locking the push-pull handle (4) to slide relative to the push-pull handle base (3); and when the push-pull handle base (3) is configured to rotate relative to the carrying portion, the push-pull handle (4) is enabled to switch between a first position that is horizontal relative to the bearing plate (1) and a second position that is vertical relative to the bearing plate (1). Regardless of whether there is an object placed on the bearing plate (1), the deployment and the position switching of the push-pull handle (4) are not affected; and the whole hand truck can be quickly and easily unfolded.

Description

A multifunctional folding trolley Technical Field

[0001] The present invention belongs to the technical field of trolleys, and more specifically, relates to a multifunctional folding trolley. Background Art

[0002] A handcart is a transport vehicle that is pushed and pulled by manpower. It can be used in places where motor vehicles are inconvenient to use and is very convenient for transporting light items over short distances.

[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. When the push handle is folded, it is placed parallel to the top surface of the load-bearing plate. Some push handles are higher than the top surface of the load-bearing plate when placed parallel. Some push handles are flush with the top surface of the load-bearing plate by providing storage grooves on the load-bearing plate. For this type of folding trolley with the push handle folded, if objects such as shopping baskets are placed on the load-bearing plate, the shopping baskets and other objects need to be removed first when the push handle is flipped open, which is inconvenient to use.

[0004] For example, the Chinese utility model patent with publication number CN218055236U and invention name is lightweight folding trolley, which includes a base plate and a push handle, the upper surface of the base plate is integrally extended upward to provide a push handle connecting part, the push handle is connected to the push handle connecting part, and a folding limit mechanism is provided between the push handle and the push handle connecting part for limiting the rotation of the push handle, the folding limit mechanism includes a limit rod and a tension spring, the limit rod is slidably connected to the push handle connecting part and can switch between a locked position and an unlocked position, the tension spring always gives the limit rod a force to slide to the locked position, the bottom of the base plate is integrally extended downward to provide a front wheel connecting part, the front wheel of the trolley is rotatably connected to the front wheel connecting part, and the bottom of the base plate is also provided with a universal wheel. According to the technical solution disclosed above, when the push handle is folded, objects such as a shopping basket cannot be placed well on the bottom plate. Even if they can be placed, the shopping basket and other objects need to be removed before flipping the push handle open. Otherwise, the shopping basket and other objects will be blocked and cannot be opened, which is inconvenient to use.

[0005] Summary of the Invention

[0006] The purpose of the present invention is to solve the above-mentioned problems and to provide a multifunctional foldable trolley which can be opened without affecting the handle when objects such as a shopping basket are placed on the load-bearing plate.

[0007] The present invention is achieved through the following technical solutions.

[0008] The present invention provides a multifunctional folding trolley, comprising a load-bearing part, a push-pull part and a caster part, as well as an opening positioning device for locking the push-pull part in an open state, wherein the load-bearing part comprises a load-bearing frame and a load-bearing plate connected to each other, the push-pull part comprises a push-pull handle seat and a push-pull handle, the push-pull handle seat is pivotally connected to the load-bearing part through a pivot shaft, the push-pull handle seat is provided with a sliding channel, the support rod of the push-pull handle is inserted in the sliding channel and can slide relative to the push-pull handle seat, the push-pull handle seat is provided with a first locking mechanism that can lock the push-pull handle from sliding relative to the push-pull handle seat, when the push-pull handle seat is configured to rotate relative to the load-bearing part, the push-pull handle can be switched between a first position relatively horizontal with the load-bearing part and a second position relatively upright with the load-bearing part, when the push-pull handle is in the first position relatively horizontal with the load-bearing part, the support rod slides along the sliding channel and can slide to a space where the load-bearing part is lower than the top surface of the load-bearing plate.

[0009] In the above technical solution, the push-pull handle and the existing push-pull handle are different in the way they are flipped open relative to the load-bearing plate. When the push-pull handle of the present invention is opened from the folded state, the push-pull handle is first pulled out in the horizontal first position to the bottom end of the push-pull handle and separated from the load-bearing part, and then the push-pull handle seat is rotated to make the push-pull handle flip to the second position upright relative to the load-bearing plate. In the process of the push-pull handle being converted from the first position to the second position, or from the second position to the first position, whether or not there are objects placed on the load-bearing plate will not affect the opening and position conversion of the push-pull handle. Moreover, when the push-pull handle seat is rotated to the second position where the push-pull handle and the load-bearing plate are upright relative to each other, the opening positioning device will lock the push-pull part to maintain the push-pull handle and the load-bearing plate in an upright state relative to each other. It is very convenient to use and is especially suitable for use with a shopping basket.

[0010] Preferably, the caster portion includes a caster assembly and a caster connecting rod connecting two or more caster assemblies, the caster connecting rod being rotatably connected to the load-bearing frame, the caster assembly including a caster, a caster frame, and a caster sleeve, the caster being rotatably mounted on the caster frame, the caster frame being fixed to the caster sleeve, and the caster sleeve being fixed to the caster connecting rod. In this technical solution, the caster connecting rod is rotatably connected to the load-bearing frame, the caster assembly can rotate with the caster connecting rod, and the caster assembly can switch between a parallel retracted state and an upright walking state relative to the load-bearing portion, thereby facilitating the folding and storage of the vehicle body and the unfolding and use of the vehicle body.

[0011] Preferably, the caster connecting rod is rotatably connected to the load-bearing frame via a connecting sleeve. The connecting sleeve is mounted on the caster connecting rod, and the caster connecting rod can rotate relative to the connecting sleeve. The connecting sleeve includes a first connecting portion and a second connecting portion, the first connecting portion being fixedly connected to the load-bearing frame, and the second connecting portion being fixedly connected to the load-bearing plate. The caster connecting rod is connected to the push-pull handle base via a linkage. In this way, the caster portion is firmly and reliably connected to the load-bearing portion, and the linkage device can also synchronize the opening and closing of the caster portion with the push-pull handle base, making the folding and unfolding of the caster portion quick and convenient.

[0012] Preferably, the opening and positioning device includes a fixing rod, a button connecting rod, an operating button, a lock seat connecting rod, a lock seat, a lock seat spring and a lock pin. The number of the fixing rods is two, the button connecting rod is arranged between the two fixing rods and connected to the fixing rod, the operating button is fixed on the button connecting rod, the lock seat connecting rod is connected to the two fixing rods and the end of the lock seat connecting rod extends to the outside of the fixing rod, the lock seat is fixed to the end of the lock seat connecting rod and is sleeved on the caster connecting rod, the lock pin is arranged at one end of the fixing rod close to the push-pull handle seat, and the push-pull handle seat is provided with a bayonet that cooperates with the lock pin at the position corresponding to the lock pin, and the lock seat spring is sleeved on the caster connecting rod and located between the connecting sleeve and the lock seat to provide elastic force for the lock pin to be snapped into the bayonet. In this technical solution, the lock seat is mounted on the caster connecting rod to realize the sliding connection between the entire opening positioning device and the caster connecting rod. When the operation button is pressed, the entire opening positioning device can slide relative to the caster connecting rod to disengage the locking pin from the bayonet, thereby unlocking the push-pull handle seat and the opening positioning device. After the force applied to the operation button is released, the entire opening positioning device can be reset under the elastic force of the lock seat spring, and the locking pin can be stuck in the bayonet to lock the push-pull handle seat.

[0013] Preferably, the lock base is provided with a latch on the end surface facing the caster sleeve, and the caster sleeve is provided with a slot on the end surface facing the lock base that cooperates with the latch, and the latch is configured to snap into the slot when the caster is rotated and opened to an upright position relative to the load-bearing portion. In this technical solution, the rotation and opening of the caster to the upright position relative to the load-bearing portion corresponds to the rotation of the push-pull handle base to the second position in which the push-pull handle and the load-bearing portion are upright relative to each other. That is, while the locking pin is engaged with the bayonet to lock the push-pull handle base, the latch cooperates with the slot to lock the caster sleeve so that the caster portion cannot be retracted relative to the load-bearing portion, thereby better maintaining the upright walking state of the caster portion relative to the load-bearing portion and the upright open state of the push-pull portion relative to the load-bearing portion.

[0014] Preferably, the front end of the carrier is provided with a fixing seat, which is fixedly connected to the load-bearing plate. The fixing seat includes an inner end surface and an outer end surface. The pivot shaft passes through the fixing seat and the carrier from the outer end surface of the fixing seat and is pivotally connected to the push-pull handle seat. The push-pull handle seat is provided with a metal locking plate at a position corresponding to the inner end surface of the fixing seat. The bayonet is provided on the metal locking plate and is configured to engage with a locking pin when the push-pull handle is in the second position. In this way, the connection strength between the carrier and the load-bearing plate is strengthened, while facilitating the pivotal connection with the push-pull handle seat. The bayonet is provided on the metal locking plate to ensure its strength.

[0015] Preferably, the linkage device includes a first mating portion and a second mating portion, wherein the first mating portion and the second mating portion are mutually engaging teeth. The teeth of the first mating portion are arranged on the outer end surface of the fixed base, passing through the pivot shaft, and are connected and fixed to the push-pull handle base via two connecting pins arranged coaxially with the pivot shaft. The teeth of the second mating portion are arranged on the end surface of the caster sleeve. In this way, when the push-pull handle base rotates, the teeth of the first mating portion, which are connected and fixed to the push-pull handle base, can drive the teeth of the second mating portion to rotate the caster portion, thereby achieving synchronous opening and closing of the push-pull handle base and the caster portion.

[0016] Preferably, the push-pull handle base is provided with a rotating sleeve within the sliding channel. The rotating sleeve is rotatably connected to the push-pull handle base via a pin at a position offset from its center. The support rod is inserted into the rotating sleeve and can slide relative to the rotating sleeve. In this technical solution, after the push-pull handle slides relative to the push-pull handle base to a fully open position, the rotating sleeve can be used to rotate relative to the push-pull handle base. That is, the push-pull handle can be swung between the first position and the second position, converting it into a towable configuration.

[0017] Preferably, the first locking mechanism includes a first button, a first locking block and a first spring, a driving pin is provided at the left and right ends of the first button, the first locking block is provided with a guide slide groove cooperating with the driving pin, and a locking pin for locking the push-pull handle, the number of the first locking blocks is two, and the two first locking blocks are respectively arranged at the left and right ends of the first button, and when the first button is pressed, the driving pin cooperates with the guide slide groove to make the two first locking blocks approach each other, the first spring is arranged at the bottom of the first button to provide elastic force for resetting the first button, and the rotating sleeve is provided with an avoidance hole for allowing the locking pin to pass through at the position corresponding to the locking pin, and the support rod is provided with a first locking hole and a second locking hole, when the first locking hole cooperates with the locking pin to lock, the push-pull handle slides to a fully retracted position relative to the push-pull handle seat, and when the second locking hole cooperates with the locking pin to lock, the push-pull handle slides to a fully open position relative to the push-pull handle seat. In this way, when the push-pull handle slides to the fully open position relative to the push-pull handle base, the locking pin is inserted into the avoidance hole and the second locking hole, and the rotating sleeve cannot rotate relative to the push-pull handle base. The push-pull handle is in the normal second position upright relative to the bearing part. At this time, after pressing the first button to disengage the locking pin from the second locking hole and the avoidance hole, the rotating sleeve can rotate with the pin as the rotating axis, and the push-pull handle can be converted into a dragging state. Even after releasing the first button, the rotating sleeve can still rotate because the locking pin is not aligned with the avoidance hole but presses against the side wall of the rotating sleeve.

[0018] Preferably, the top edge of the load-bearing plate is provided with a surrounding edge that is higher than the top surface of the load-bearing plate, and the side of the load-bearing plate is provided with a lock buckle. In this way, the shopping basket can be placed and fixed conveniently.

[0019] The beneficial effect of the present invention is that no matter whether there are objects placed on the load-bearing plate, it will not affect the opening and position conversion of the push-pull handle; when the push-pull part is converted from the first position to the second position, the caster part can be synchronously converted from the folded state to the upright walking state, and the overall unfolding of the trolley is quick and convenient; opening the positioning device can lock the push-pull handle seat and the caster part at the same time, with good stability, and can ensure that the caster part will not be accidentally folded when the trolley is traveling; the push-pull handle can be rotated relative to the push-pull handle seat through the rotating sleeve, and can be converted into a dragging state, which has better applicability. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] FIG1 is a schematic diagram of the structure of the present invention with the lower cover plate omitted from the bottom direction.

[0021] FIG2 is a schematic structural diagram of the bottom direction of the present invention.

[0022] FIG3 is a schematic structural diagram of the push-pull handle sliding to a fully open state when the load-bearing plate and the lower cover plate are omitted in the present invention.

[0023] FIG4 is a schematic structural diagram of the push-pull handle base rotating from the first position to the second position when the load-bearing plate and the lower cover plate are omitted in the present invention.

[0024] FIG5 is a schematic structural diagram of the push-pull handle seat actively moving to the second position when the load-bearing plate and the lower cover plate are omitted in the present invention.

[0025] FIG6 is a schematic structural diagram of the push-pull handle seat of the present invention.

[0026] FIG7 is a schematic structural diagram of the load-bearing part and the caster part of the present invention.

[0027] FIG8 is a schematic structural diagram of the connecting sleeve of the present invention.

[0028] FIG9 is a schematic structural diagram of the opening positioning device of the present invention.

[0029] FIG10 is a schematic diagram of the structure of the present invention when viewed from above, omitting the load-bearing plate, the lower cover plate, and the push-pull part.

[0030] FIG11 is a schematic diagram of the partial structure of the locking seat and the caster sleeve of the present invention.

[0031] FIG12 is a schematic structural diagram of the push-pull handle fully folded when the load-bearing plate and the lower cover plate are omitted in the present invention.

[0032] FIG13 is a partially enlarged schematic diagram of portion A of FIG12 .

[0033] FIG14 is a schematic structural diagram of the fixing seat of the present invention.

[0034] FIG15 is a schematic diagram of the partial structure of the locking pin and the bayonet fitting according to the present invention.

[0035] FIG16 is a schematic structural diagram of the push-pull part of the present invention.

[0036] FIG17 is a partial cross-sectional structural diagram of the push-pull handle seat and the support rod of the present invention.

[0037] FIG18 is a schematic diagram of the overall structure of the push-pull handle of the present invention when it is in the second position.

[0038] FIG19 is a schematic diagram of the overall structure of the push-pull handle of the present invention when it is in the dragging configuration.

[0039] FIG20 is a schematic diagram of the overall structure of the push-pull handle of the present invention in the first position and including a shopping basket.

[0040] FIG21 is a schematic diagram of the overall structure of the present invention, in which the push-pull handle is located in the second position and includes a shopping basket. DETAILED DESCRIPTION

[0041] The present invention will be further described below with reference to the accompanying drawings, which are for illustrative purposes only and are not to be construed as limiting the present invention.

[0042] To more concisely illustrate this embodiment, some components well known to those skilled in the art but not relevant to the main content of this invention may be omitted from the drawings or descriptions. In addition, for ease of description, some components may be omitted, enlarged, or reduced in size in the drawings, but they do not represent the dimensions or entire structure of the actual product.

[0043] Example 1

[0044] The multifunctional folding trolley of this embodiment includes a load-bearing portion, a push-pull portion, and casters, as well as an opening positioning device 9 that locks the push-pull portion in the open state. As shown in Figures 1 and 2, the load-bearing portion includes a load-bearing frame 2 and a load-bearing plate 1 connected to each other. The bottom of the load-bearing plate 1 is connected to a lower cover 15. The function of the lower cover 15 is to encapsulate the load-bearing frame 2, the opening positioning device 9, etc., and enhance the connection strength and dustproof effect of the overall product.

[0045] As shown in Figures 1 to 6, the push-pull portion 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 portion via a pivot shaft 5. The push-pull handle seat 3 is provided with a sliding channel 31. The push-pull handle 4 includes two parallel support rods 41 and a crossbar 43 provided at the top ends of the support rods 41 to connect the two support rods 41 together. The support 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 that can lock the push-pull handle 4 from sliding relative to the push-pull handle seat 3. When the push-pull handle seat 3 is configured to rotate relative to the load-bearing portion, the push-pull handle 4 can be switched between a first position horizontal with the load-bearing portion and a second position upright with the load-bearing portion. When the push-pull handle 4 is in the first position horizontal with the load-bearing portion, the support rods 41 slide along the sliding channel 31 and can slide into the space at the bottom of the load-bearing plate 1, that is, the space enclosed by the load-bearing plate 1 and the lower cover plate 15. When the push-pull handle 4 needs to be converted to the second position upright relative to the bearing part, the first locking mechanism 6 is first operated to unlock the push-pull handle 4 and the push-pull handle seat 3, and then the push-pull handle 4 is horizontally pulled out from the first position until the bottom end of the support rod 41 abuts against the push-pull handle seat 3 and can no longer be pulled out. The first locking mechanism 6 will automatically lock the push-pull handle 4 and the push-pull handle seat 3, and finally the push-pull handle seat 3 is rotated 90 degrees with the pivot shaft 5 as the rotation axis to complete the conversion.

[0046] In this embodiment, as shown in Figures 7 and 8, the caster portion includes a caster assembly and a caster connecting rod 7 connecting two caster assemblies, wherein the number of the caster connecting rods 7 is two, and the two caster connecting rods 7 are arranged in parallel with each other, and each caster connecting rod 7 is connected to two caster assemblies. 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 fixed on the caster connecting rod 7. The caster connecting rod 7 is rotatably connected to the load-bearing frame 2 through a connecting sleeve 8. The connecting sleeve 8 is mounted 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 portion 81 and a second connecting portion 82. The first connecting portion 81 is connected and fixed to the load-bearing frame 2, and the second connecting portion 82 is connected and fixed to the load-bearing plate 1.

[0047] In this embodiment, as shown in Figures 7, 9 and 10, the opening positioning device 9 includes a fixed rod 91, a button connecting rod 92, an operating button 93, a lock seat connecting rod 94, a lock seat 95, a lock seat spring 96 and a locking pin 97. There are two fixed rods 91, and 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 to the fixed rods 91. The operating button 93 is fixed in the middle position of the button connecting rod 92. In order to facilitate the operation of the operating button 93, the push-pull handle base 3 leaves an avoidance space at the position corresponding to the operating button 93. There are two lock seat connecting rods 94, located at the front and rear of the fixed rods 91 and connected to the two fixed rods 91. The ends of the lock seat connecting rods 94 extend to the outside of the fixed rods 91. There are four lock seats 95, fixed to the four ends of the two lock seat connecting rods 94 and sleeved on the caster connecting rod 7. A locking pin 97 is set at the front end of the fixed rod 91, that is, near the end of the push-pull handle base 3. The push-pull handle base 3 has a latch 321 that cooperates with the locking pin 97 at the position corresponding to the locking pin 97. As shown in Figure 10, a lock seat spring 96 is sleeved on the caster connecting rod 7, located between the connecting sleeve 8 on the upper part of the caster connecting rod 7 and the lock seat 95, providing elastic force for the locking pin 97 to engage with the latch 321.

[0048] As a further improvement, as shown in FIG11 , the lock seat 95 has an integrally formed latch 951 on the end surface facing the caster sleeve 73, and the caster sleeve 73 has a slot 731 on the end surface facing the lock seat 95 that cooperates with the latch 951. The latch 951 can be inserted into the slot 731 when the caster 71 is rotated and opened to an upright position relative to the load-bearing part.

[0049] In this embodiment, as shown in Figures 12 to 15 , a fixing seat 21 is provided at the front end of the carrier 2. The fixing seat 21 is provided with a vertical connection portion 213. The fixing seat 21 is connected and fixed to the load-bearing plate 1 and the lower cover plate 15 by screws passing through the vertical connection portion 213. A circular blind hole 214 is also provided on the side of the fixing seat 21 facing the caster connecting rod 7 to accommodate the end of the caster connecting rod 7 for insertion, thereby axially limiting the caster connecting rod 7. The fixing seat 21 includes an inner end surface 211 and an outer end surface 212. The pivot shaft 5 passes through the fixing seat 21 and the carrier 2 from the outer end surface 212 of the fixing seat 21, and is pivotally connected to the push-pull handle seat 3. As shown in Figure 15, the push-pull handle base 3 is provided with a metal locking plate 32 at a position corresponding to the inner end surface 211 of the fixed base 21. A latch 321 is provided on the metal locking plate 32. The latch 321 is configured to engage with a locking pin 97 to lock the push-pull handle base 3 when the push-pull handle 4 is rotated to the second position, upright relative to the bearing portion. A clearance slot 36 is provided on the side of the metal locking plate 32 at the position of the push-pull handle base 3 to accommodate the end of the fixed rod 91.

[0050] In this embodiment, as shown in Figures 16 and 17, 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 arranged in 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 driving pins 611, and the first locking block 62 is provided with an inclined guide groove 621 that cooperates with the driving pin 611, and a locking pin 622 for locking the push-pull handle 4. There are two first locking blocks 62, and the two first locking blocks 62 are respectively arranged at the left and right ends of the first button 61. The guide grooves 621 of the two first locking blocks 62 form a similar figure-eight layout. When the first button 61 is pressed, the driving pin 611 cooperates with the guide groove 621 to make the two first locking blocks 62 approach each other so that the locking pin 622 disengages from the support rod 41. The first spring 63 is arranged 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 base 3, and the top of the first spring 63 is against the bottom of the first button 61, and the bottom of the first spring 63 is against the sealing plate 34. The support rod 41 is provided with a first locking hole 411 and a second locking hole 412 at the inner side of the upper and lower portions, respectively. A stopper 42 is mounted at the bottom of the support rod 41. The inner side of the stopper 42 is provided with a hole for inserting a locking pin 622 at a position corresponding to the second locking hole 412. The stopper 2 is configured to be unable to pass through the sliding channel 31, thereby preventing the push-pull handle 4 from being separated from the push-pull handle base 3. When the push-pull handle 4 slides to be fully retracted relative to the push-pull handle base 3, the first locking hole 411 cooperates with the locking pin 622 to lock it. When the push-pull handle 4 slides to be fully opened relative to the push-pull handle base 3, the second locking hole 412 cooperates with the locking pin 622 to lock it.

[0051] In this embodiment, as shown in FIG5 , the caster portion is first manually opened to the upright walking position, and then the first locking mechanism 6 is operated to unlock the push-pull handle 4 and the push-pull handle seat 3. The push-pull handle 4 is horizontally pulled out from the first position until the bottom end of the support rod 41 contacts the push-pull handle seat 3 and cannot be pulled further. The first locking mechanism 6 automatically locks the push-pull handle 4 and the push-pull handle seat 3. Finally, the push-pull handle seat 3 is rotated 90 degrees about the pivot axis 5 to complete the conversion. At this time, the positioning device 9 is opened. Under the elastic force of the lock seat spring 96, the locking pin 97 automatically engages with the bayonet 321 of the push-pull handle seat 3, and the latch 951 of the lock seat 95 simultaneously inserts into the slot 731 of the caster sleeve 73 to lock the push-pull handle seat 3 and the caster portion. When unlocking is required, pressing the operating button 93 drives the locking pin 97 out of the bayonet 321, and the latch 951 also disengages the slot 731 to unlock.

[0052] Example 2

[0053] This embodiment has a similar structure to that of embodiment 1, with the difference being that, as shown in Figures 12, 13, 16 and 17, in this embodiment, the caster connecting rod 7 is connected to the push-pull handle seat 3 through a linkage device, and the linkage device includes a first matching portion and a second matching portion, and the first matching portion and the second matching portion are teeth 35 and 74 that cooperate and mesh with each other. The tooth piece 35 of the first matching portion is arranged at the outer end surface 212 of the fixed seat 21 and passes through the pivot shaft 5, and the tooth piece 35 of the first matching portion is connected and fixed to the push-pull handle seat 3 through two connecting nails arranged coaxially with the pivot shaft 5, so that the tooth piece 35 of the first matching portion will rotate synchronously with the push-pull handle seat 3, and the tooth piece 74 of the second matching portion is arranged on the end surface of the caster sleeve 73 and fixed to the caster sleeve 73.

[0054] In this way, when the push-pull handle base 3 rotates, the tooth piece 35 of the first matching part fixedly connected to the push-pull handle base 3 can drive the tooth piece 74 of the second matching part to drive the caster part to rotate, thereby realizing the synchronous opening and closing of the push-pull handle base 3 and the caster part.

[0055] Example 3

[0056] This embodiment has a similar structure to that of embodiment 2, with the difference being that, as shown in Figures 16 to 19, in this embodiment, a push-pull handle seat 3 is provided with a rotating sleeve 33 in the sliding channel 31, and the rotating sleeve 33 is rotatably connected to the push-pull handle seat 3 by a pin 332 at a position deviated from its center, and the support rod 41 is inserted in the rotating sleeve 33 and can slide relative to the rotating sleeve 33, and the rotating sleeve 33 is provided with an avoidance hole 331 for allowing the lock pin 622 to pass through at a position corresponding to the lock pin 622. In this way, when the push-pull handle 4 slides to the fully open position relative to the push-pull handle base 3, the locking pin 622 is inserted into the avoidance hole 331 and the second locking hole 412, and the rotating sleeve 33 cannot rotate relative to the push-pull handle base 3. The push-pull handle 4 is in the normal second position upright relative to the load-bearing plate 1. At this time, after pressing the first button 61 to disengage the locking pin 622 from the second locking hole 412 and the avoidance hole 331, the rotating sleeve 33 can be rotated with the pin 332 as the rotating axis, and the push-pull handle 4 can be converted into a dragging state. Even after releasing the first button 61, the rotating sleeve 33 can still rotate because the locking pin 622 is not aligned with the avoidance hole 331 but presses against the side wall of the rotating sleeve 33.

[0057] In order to make the push-pull handle adaptable to people of all heights and provide a comfortable experience, an extension rod 44 that can be extended and retracted relative to the support rod 41 is also embedded in the support rod 41, and a cross bar 43 is provided at the top of the extension rod 44 to connect the two extension rods 44 together.

[0058] Example 4

[0059] This embodiment is similar in structure to embodiment 3, with the difference being that, as shown in Figures 18 to 21, in this embodiment, a peripheral edge 11 is provided on the edge of the top surface of the load-bearing plate 1, which is higher than the top surface of the load-bearing plate 1, and a lock 12 for fixing the shopping basket 16 is provided on the side of the load-bearing plate 1. A storage groove 14 is provided on the top surface of the load-bearing plate 1 at the end away from the push-pull handle 4, and a baffle 13 is hinged in the storage groove 14. The baffle 13 can be flipped over and stored horizontally in the storage groove 14, or it can be flipped open and vertically relative to the load-bearing plate 1. When placing goods on the load-bearing plate 1, opening the baffle 13 can block the goods, which has a certain fixing effect.

[0060] The shopping basket 16 is placed on the top surface of the load-bearing plate 1, and the boss provided on the bottom thereof will be embedded in the top surface of the load-bearing plate 1 surrounded by the edge 11. During the movement of the trolley, the shopping basket will not slide due to vibration. In addition, the shopping basket 16 is further fixed by the lock buckle 12 provided on the side of the load-bearing plate 1. When the shopping basket 16 is folded without load, it can be well fixed to the load-bearing plate 1 and will not fall off. The whole is easy 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.

[0061] The above are only specific embodiments of the present invention, but the design concept of the present invention is not limited thereto. Any non-substantial modifications made to the present invention using the concept of the present invention fall within the scope of protection of the present invention.

Claims

1. A multifunctional folding trolley, comprising a load-bearing portion, a push-pull portion and a caster portion, and an opening positioning device (9) for locking the push-pull portion in an open state, wherein: The bearing part comprises a bearing frame (2) and a bearing plate (1) connected to each other, and is characterized in that the push-pull part comprises a push-pull handle seat (3) and a push-pull handle (4), the push-pull handle seat (3) is pivotally connected to the bearing part through a pivot shaft (5), the push-pull handle seat (3) is provided with a sliding channel (31), a 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) capable of locking the push-pull handle (4) from sliding relative to the push-pull handle seat (3), the push-pull handle seat (3) is arranged to be able to switch between a first position relatively horizontal to the bearing part and a second position relatively upright to the bearing part when the push-pull handle seat (3) is rotated relative to the bearing part, and when the push-pull handle (4) is located at the first position relatively horizontal to the bearing part, the support rod (41) slides along the sliding channel (31) and can slide to a space where the bearing part is lower than the top surface of the bearing plate (1).

2. The multifunctional foldable trolley according to claim 1, characterized in that: The caster part comprises 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 carrier frame (2); the caster assembly comprises 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); and the caster sleeve (73) is sleeved on the caster connecting rod (7) and fixed.

3. The multifunctional foldable trolley according to claim 2, characterized in that: The caster connecting rod (7) is rotatably connected to the bearing frame (2) via 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 portion (81) and a second connecting portion (82); the first connecting portion (81) is connected and fixed to the bearing frame (2); the second connecting portion (82) is connected and fixed to the load-bearing plate (1); and the caster connecting rod (7) is connected to the push-pull handle seat (3) via a linkage device.

4. The multifunctional foldable trolley according to claim 3, characterized in that: The opening positioning device (9) comprises a fixing rod (91), a button connecting rod (92), an operating button (93), a lock seat connecting rod (94), a lock seat (95), a lock seat spring (96) and a locking pin (97); the number of the fixing rods (91) is two, the button connecting rod (92) is arranged between the two fixing rods (91) and connected to the fixing rods (91), the operating button (93) is fixed on the button connecting rod (92), the lock seat connecting rod (94) is connected to the two fixing rods (91) and the end of the lock seat connecting rod (94) The locking seat (95) is fixed to the end of the locking seat connecting rod (94) and is sleeved on the caster connecting rod (7). The locking pin (97) is arranged at one end of the fixing rod (91) close to the push-pull handle seat (3). The push-pull handle seat (3) is provided with a bayonet (321) cooperating with the locking pin (97) at a position corresponding to the locking pin (97). The locking seat spring (96) is sleeved on the caster connecting rod (7) and is located between the connecting sleeve (8) and the locking seat (95) to provide elastic force for the locking pin (97) to be inserted into the bayonet (321).

5. The multifunctional foldable trolley according to claim 4, characterized in that: The lock seat (95) is provided with a latch (951) on the end surface facing the caster sleeve (73), and the caster sleeve (73) is provided with a slot (731) cooperating with the latch (951) on the end surface facing the lock seat (95), and the latch (951) is configured to be inserted into the slot (731) when the caster (71) is rotated and opened to an upright position relative to the bearing part.

6. The multifunctional foldable trolley according to claim 5, characterized in that: The front end of the support frame (2) is provided with a fixing seat (21), the fixing seat (21) is connected and fixed to the load-bearing plate (1), the fixing seat (21) comprises an inner end surface (211) and an outer end surface (212), the pivot axis (5) passes through the fixing seat (21) and the support frame (2) from the outer end surface (212) of the fixing seat (21) 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 a position corresponding to the inner end surface (211) of the fixing seat (21), the bayonet (321) is provided on the metal locking plate (32), and the bayonet (321) is configured to cooperate with the locking pin (97) to lock when the push-pull handle (4) is located in the second position.

7. The multifunctional foldable trolley according to claim 6, characterized in that: The linkage device comprises a first matching part and a second matching part, wherein the first matching part and the second matching part are tooth pieces (35, 74) that mesh with each other, the tooth piece (35) of the first matching part is arranged at a position on the outer end surface (212) of the fixed seat (21) and passes through the pivot shaft (5), and the tooth piece (35) of the first matching part is connected and fixed to the push-pull handle seat (3) through two connecting nails arranged coaxially with the pivot shaft (5), and the tooth piece (74) of the second matching part is arranged on the end surface of the caster sleeve (73).

8. The multifunctional foldable trolley according to any one of claims 1 to 7, characterized in that: 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 to the push-pull handle seat (3) via a pin (332) at a position deviating from the center thereof; the support rod (41) is inserted into the rotating sleeve (33) and can slide relative to the rotating sleeve (33).

9. The multifunctional foldable trolley according to claim 8, characterized in that: The first locking mechanism (6) comprises a first button (61), a first locking block (62) and a first spring (63); a driving pin (611) is provided at the left and right ends of the first button (61); the first locking block (62) is provided with a guide slot (621) matched with the driving pin (611) and a locking pin (622) for locking the push-pull handle (4); there are two first locking blocks (62), which are respectively arranged at the left and right ends of the first button (61); when the first button (61) is pressed, the driving pin (611) cooperates with the guide slot (621) to make the two first locking blocks (62) approach each other; The first spring (63) is arranged at the bottom of the first button (61) to provide elastic force for resetting the first button (61); the rotating sleeve (33) is provided with an avoidance hole (331) for allowing the locking pin (622) to pass through at a position corresponding to the locking pin (622); the support rod (41) is provided with a first locking hole (411) and a second locking hole (412); when the first locking hole (411) and the locking pin (622) are locked in cooperation, the push-pull handle (4) slides to a fully retracted position relative to the push-pull handle seat (3); when the second locking hole (412) and the locking pin (622) are locked in cooperation, the push-pull handle (4) slides to a fully opened position relative to the push-pull handle seat (3).

10. The multifunctional foldable trolley according to claim 1, characterized in that: The edge of the top surface of the load-bearing plate (1) is provided with a peripheral edge (11) that is higher than the top surface of the load-bearing plate (1), and a locking buckle (11) is provided on the side surface of the load-bearing plate (1).

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