CN212022741U - Improved dual-purpose folding handcart - Google Patents

Abstract

The utility model discloses a dual-purpose folding handcart of modified, including heavy burden carrier, preceding caster unit, back caster unit, shovel board and promotion handle, still include preceding caster unit rotation drive arrangement, preceding caster unit rotation drive arrangement installs and can drive preceding caster unit rotation and open to launching the roll position on heavy burden carrier, it sets to rotate to launching the roll position from folding the storage position when the carrier is upright to can drive back caster unit from folding the storage position when the carrier is rotated to heavy burden relatively from the storage position side by side with heavy burden carrier to promote the handle, it sets to rotate to heavy burden carrier relatively from the storage position side by side with heavy burden carrier to promote the handle to rotate, and continue syntropy to be can will promote the handle locking through locking mechanism when being parallel relatively with heavy burden carrier. The beneficial effects of the utility model reside in that, front caster unit rotation drive device's structure is simpler, and manufacturing cost is lower, has the function of four-wheel flat handcart and two-wheeled handcart, and application scope is wide.

Description

Improved dual-purpose folding handcart

Technical Field

The utility model belongs to the technical field of small-size plane transportation equipment, more specifically say, especially, relate to a dual-purpose folding handcart of modified.

Background

The handcart is a common transporting tool at present, and is used for transporting goods in markets, supermarkets and the like between shelves and warehouses and storing and transporting the goods for consumers in shopping. The types of the trolleys are mainly divided into two categories, one is a four-wheel flat-plate trolley, the other is a two-wheel trolley, the scenes are different, and the trolleys required to be used are different. The four-wheel flat handcart is suitable for transporting goods with larger transverse width, and the two-wheel handcart is suitable for transporting goods with higher vertical height.

At present, the number of trolleys sold on the market has fewer mode conversion functions, namely, the number of trolleys which can be converted between a four-wheel flat plate trolley mode and a two-wheel trolley mode is fewer.

The patent number that the applicant applied for in 2018, 11/05 is ZL201821812513.2, and the patent name is "dual-purpose folding handcart" Chinese utility model patent, and this utility model discloses a dual-purpose folding handcart can receive the mode, four-wheel flat handcart mode and realize the conversion between the two-wheeled handcart mode folding, and the conversion is convenient, and application scope is wide. However, the technical solution disclosed in the above utility model has a more complex structure, more parts, more molds and higher manufacturing cost.

Disclosure of Invention

The present invention is directed to solve at least one of the above problems, and aims to provide an improved dual-purpose foldable trolley with a wide application range, a relatively simple structure and a lower manufacturing cost.

The utility model discloses a following technical scheme realizes.

The utility model provides a dual-purpose folding handcart of modified, including heavy burden carrier, front caster unit, back truckle unit, shovel board and promotion handle, front caster unit install in the front portion of heavy burden carrier can rotate between folding storage position and expansion roll position around the front caster unit pivot axis that corresponds, back truckle unit install in the rear portion of heavy burden carrier can rotate between folding storage position and expansion roll position around the back truckle unit pivot axis that corresponds, the shovel board pin joint is anterior at heavy burden carrier, it can rotate around promoting the relative heavy burden carrier of handle pivot axis to promote the handle to install in heavy burden carrier rear portion, it can lock the locking mechanism that promotes the relative heavy burden carrier of handle pivoted to promote to be equipped with on hand, still include preceding truckle unit rotation drive arrangement, preceding truckle unit rotation drive arrangement installs and can drive preceding truckle unit rotation and open to expand on the carrier and hold heavy burden carrier pivoted locking mechanism A rolling position, the front caster wheel unit driving device comprises an operating handle, a connecting rod and a driving plate, the operating handle is pivoted with the load carrier and can rotate around an operating handle pivot axis, the connecting rod is connected with the operating handle, the driving plate is connected with the connecting rod and the front caster wheel unit, when the operating handle rotates from a first position to a second position, the operating handle can be linked with the driving plate through the connecting rod to drive the front caster wheel unit to rotate from a folding storage position to an unfolding rolling position, the front caster wheel unit is provided with a first resetting device, when the operating handle rotates from the second position to the first position, the front caster wheel unit can rotate from the unfolding rolling position to the folding storage position under the action of the resetting device, the pushing handle is arranged to drive the rear caster wheel unit to rotate from the folding storage position to the unfolding rolling position when the operating handle rotates from the storage position which is parallel to the load carrier to the upright relative to the load carrier, the rear caster wheel unit is provided with a second reset device, when the push handle rotates to the storage position which is parallel to the load carrier, the rear caster wheel unit can rotate to the folding storage position from the unfolding rolling position under the action of the reset device, the push handle is arranged to rotate to be vertical relative to the load carrier from the storage position which is parallel to the load carrier and can be locked by the push handle through a locking mechanism when continuing rotating in the same direction to be parallel to the load carrier.

Among the above-mentioned technical scheme, the structure of preceding caster unit rotation drive device has been simplified, low in manufacturing cost, when using, the heavy burden carrier is upright, rotate operating handle to the second position from the first position and can drive preceding caster unit and open, will promote the handle and rotate to the upright time of the relative heavy burden carrier through locking mechanism locking from the storage position side by side with the heavy burden carrier and can convert four-wheel flat cart mode into, it can convert two-wheeled cart mode into through locking mechanism locking when continuing to rotate operating handle syntropy to being parallel relatively with the heavy burden carrier, and is easy and simple to handle.

Preferably, the load carrier comprises a support frame and a bearing plate, the support frame comprises two support pipes, the two support pipes are symmetrically arranged at the left side and the right side of the bottom of the bearing plate, the front caster unit is arranged at the front part of the support pipes, and the rear caster unit is arranged at the rear part of the support pipes. Therefore, the bearing capacity of the bearing plate can be improved, and the front caster unit and the rear caster unit are convenient to mount.

Preferably, the shovel plate is provided with a pivot base at a position corresponding to the front ends of the two support tubes, the pivot base is pivoted with the front ends of the support tubes, a compression spring and a positioning pin are sequentially embedded in the front-end tube of the support tubes, and the positioning pin can be abutted against the base wall of the pivot base of the shovel plate under the action of the compression spring. Like this, when the shovel board rotates to open or fold the storage relative to the heavy burden carrier, the locating pin can provide pressure location for the shovel board, can effectively avoid the shovel board accident to open.

Preferably, the front caster unit comprises a front fixing sleeve, a front caster frame and a front caster, the front fixing sleeve is provided with a notch, one end of the front caster frame is arranged in the notch, the front fixing sleeve and the front caster frame are both sleeved on the support tube, the front fixing sleeve is fixedly connected with the support tube, the front caster is rotatably mounted on the front caster frame, the first resetting device is a first torsion spring, the first torsion spring is sleeved on the support tube, and two ends of the first torsion spring respectively abut against the front fixing sleeve and the front caster frame so as to provide acting force for the rotation of the front caster frame relative to the front fixing sleeve. In this way, the front caster unit may support the tube for rotation of the front caster unit pivot axis between the folded storage position and the unfolded rolling position.

Preferably, the operating handle comprises a U-shaped handle main body, the handle main body comprises two side arms of an integral structure and a handle arranged between the two side arms and used for connecting one end of each of the two side arms, the free ends of the side arms are pivoted with a fixed seat, the fixed seat is fixedly connected with the bottom of the bearing plate, the inner sides of the side arms are provided with first convex columns, the fixed seats are provided with second convex columns on the same side, tension springs are arranged between the first convex columns and the second convex columns, two ends of each tension spring are respectively fixed on the first convex columns and the second convex columns, connecting shafts are arranged on the outer sides of the side arms, one ends of the connecting rods are pivoted with the operating handle through the connecting shafts, the other ends of the connecting rods are rotatably connected with one side of the driving plate close to the operating handle, one side of the connecting rod far away from the operating handle is pivoted with a front fixed, when the drive plate rotates by taking the connecting nails as rotating shafts, the left end and the right end of the drive plate can drive the two front caster units to rotate from the folding storage position to the unfolding rolling position. Therefore, when the operating handle rotates from the first position to the second position, the connecting rod can push the driving plate to rotate by taking the connecting nail as a rotating shaft, and the two ends of the driving plate respectively force the front two front caster units to rotate to the unfolding rolling position

Preferably, the inner side of the caster frame of the front caster unit is provided with a clamping column, the end of the drive plate is provided with a clamping groove at a position corresponding to the clamping column, and the clamping column is arranged to be clamped into the clamping groove when the front caster unit rotates to the unfolding rolling position. Thus, the stability of the front caster unit maintained in the deployed rolling position can be improved.

Preferably, the rear caster unit includes a rear fixing sleeve, a rotating block, a rear caster frame and a rear caster, the rear fixing sleeve is provided with a first through hole and a second through hole in the length direction, the first through hole and the second through hole are distributed in parallel on the rear fixing sleeve, the rear fixing sleeve is sleeved on the supporting tube through a first through hole and is connected and fixed with the supporting tube, a notch is arranged on the rear fixing sleeve, the upper part of the rotating block is provided with a lantern ring which is arranged in the notch and is rotationally connected with the rear fixed sleeve through a connecting pipe arranged in the second through hole in a penetrating way, the rear caster frame is fixedly connected with the rotating block, the rear caster is rotatably arranged on the rear caster frame, the second reset device is a second torsion spring, the second torsion spring is sleeved on the connecting pipe, and two ends of the second torsion spring are respectively abutted against the rear fixing sleeve and the rotating block so as to provide acting force for the rotating block to rotate relative to the rear fixing sleeve. Like this, when promoting the handle and being in the storage position side by side with the heavy burden carrier, the back fixed cover can be used for placeeing the handle tip that promotes in the medial surface space that corresponds first through-hole position, promotes the handle and can not influence the folding storage of the back truckle frame of being connected with the connecting pipe this moment.

Preferably, the aforesaid promotes the handle includes two risers, the top of two risers is connected with the third horizontal pole that supplies the user gripping, the lower part of two risers all is equipped with down the adapter sleeve, promote the handle through the screw and the fixed cover pin joint in back that pass adapter sleeve, riser, the fixed cover of back and stay tube, be connected with first horizontal pole between two lower adapter sleeves, locking mechanism is including first locking lever, the first pressure spring of arranging in first horizontal pole in to and locate first horizontal pole outer first control button who is connected with first locking lever, the riser is equipped with the through-hole in the position that corresponds first locking lever, the tip of first locking lever can pass the lockhole cooperation locking that through-hole and the fixed cover inboard of back were equipped with and promote the handle. Thus, the installation and locking of the push handle are facilitated.

Preferably, the standpipe is a two-stage telescopic pipe, the telescopic pipe comprises a lower sleeve and an upper sleeve, the lower connecting sleeve is sleeved on the lower part of the lower sleeve, the top ends of the two lower sleeves are connected with a second cross rod, the second cross rod is provided with an upper sleeve locking mechanism capable of locking the upper sleeve rod, and the upper sleeve locking mechanism comprises a second locking rod and a second pressure spring which are arranged in the second cross rod, and a second control button which is arranged outside the second cross rod and connected with the second locking rod. Thus, the length of the handle can be adjusted by pushing the handle to adapt to the height of a user.

Preferably, the two lower sleeves are further connected with a reinforcing rod at a position below the lower sleeves. Thus, the structural strength of the push handle can be improved.

The beneficial effects of the utility model reside in that, front caster unit rotation driving device's structure is simpler, and manufacturing cost is lower. The multifunctional trolley has the functions of a four-wheel flat trolley and a two-wheel trolley, the application range is wide, and the conversion operation of the two modes is simple and convenient.

Drawings

Fig. 1 is a schematic perspective view of the present invention.

Fig. 2 is a schematic structural diagram of the folding storage state of the present invention.

Fig. 3 is an exploded view of the front wheel unit rotation driving device of the present invention.

Fig. 4 is an exploded view of the load carrier of the present invention.

Fig. 5 is a schematic view of the sectional structure of the shovel plate and the supporting tube of the present invention.

Fig. 6 is a schematic structural view of the front caster unit of the present invention.

Fig. 7 is a schematic structural view of the rear caster unit of the present invention.

Fig. 8 is a schematic structural view of the push handle of the present invention.

Fig. 9 is a schematic view illustrating the process of rotating the operating handle from the first position to the second position according to the present invention.

Fig. 10 is a schematic view illustrating a process of rotating the push handle from the storage position side by side with the load carrier to the upright state with respect to the load carrier when the front caster unit of the present invention is unfolded to the unfolding rolling position.

Fig. 11 is a schematic structural view of the present invention when the pushing handle is rotated to a vertical position relative to the load carrier.

Fig. 12 is a schematic structural view of the push handle of the present invention rotated to be relatively parallel to the load carrier.

Detailed Description

The present invention will be further explained with reference to the accompanying drawings. The drawings are for illustrative purposes only and are not to be construed as limiting the patent.

In order to explain the embodiment more simply, some parts of the drawings or descriptions that are well known to those skilled in the art but are not relevant to the main content of the present invention will be omitted. In addition, some components in the drawings may be omitted, enlarged or reduced for convenience of description, but do not represent the size or the entire structure of an actual product.

As shown in fig. 1, the present invention provides an improved dual-purpose folding cart, which comprises a load carrier 1, a front caster unit 2, a rear caster unit 3, a shovel plate 4 and a pushing handle 5.

As shown in fig. 4, the load carrier 1 includes a support frame and a bearing plate 11, the support frame includes two support pipes 12, the two support pipes 12 are symmetrically disposed at left and right sides of the bottom surface of the bearing plate 11, the front caster unit 1 is mounted at a lower position of the support pipes 12, and the rear caster unit 3 is mounted at an upper position of the support pipes 12. As shown in fig. 5, the shovel plate 4 is provided with a pivot base 41 at a position corresponding to the lower ends of the two support tubes 12, the pivot base 41 is pivoted with the lower ends of the support tubes 12, a compression spring 121 and a positioning pin 122 are sequentially embedded in the lower end tubes of the support tubes 12, the positioning pin is provided with a strip hole, the positioning pin is movably connected with the support tubes 12 through a screw passing through the strip hole and can axially slide along the support tubes 12, and the positioning pin 122 can abut against the wall of the pivot base 41 of the shovel plate 4 under the action of the compression spring 121.

As shown in fig. 2, the front caster unit 2 is mounted to a lower portion of the support tube 12 to be rotatable about the corresponding support tube 12 between a folded storage position and an unfolded rolling position, as shown in fig. 6, in this embodiment, the front caster unit 2 includes a front fixing sleeve 21, a front caster frame 22 and a front caster 23, a notch is arranged on the front fixing sleeve 21, one end of the front caster frame 22 is arranged in the notch, the front fixing sleeve 22 and the front caster frame 21 are both sleeved on the support tube 12, and the front fixing sleeve 22 is connected and fixed with the support tube 12, the front caster 23 is rotatably mounted on the front caster frame 22, the first return means is a first torsion spring 24, the first torsion spring 24 is sleeved on the support tube 12, and two ends of the first torsion spring 24 respectively abut against the front fixing sleeve 21 and the front caster frame 22, so as to provide acting force for the front caster frame 22 to rotate relative to the front fixing sleeve 21. A front caster unit rotation driving device capable of driving the front caster frame 22 to rotate and open to the unfolding rolling position is arranged on the bottom surface of the bearing plate 11, and comprises an operating handle 6, a connecting rod 7 and a driving plate 8.

As shown in fig. 3, in this embodiment, the operating handle 6 includes a U-shaped handle body, the handle body includes two side arms 61 of an integral structure and a handle 62 disposed between the two side arms 61 and connecting one end of the two side arms 61, a fixed seat 9 is pivotally connected to a free end of the side arm 61, the fixed seat 9 is fixedly connected to a bottom surface of the bearing plate 11, a first convex column 611 is disposed inside the side arm 61, a second convex column 92 is disposed on the same side of the fixed seat 9, a tension spring 10 is disposed between the first convex column 611 and the second convex column 91, two ends of the tension spring 10 are respectively fixed to the first convex column 611 and the second convex column 91, a connecting shaft 612 is disposed outside the side arm 61, one end of the connecting rod 7 is pivotally connected to the operating handle 6 through the connecting shaft 612, and the other end of the connecting rod 7 is rotatably connected to one side of the driving plate 8 close to the operating handle 5, the side of the driving plate 8 away from the operating handle 6 is provided with screw holes 82 at both left and right ends thereof, and as shown in fig. 9, the driving plate is pivotally connected to the front fixing sleeve 21 of the front caster unit 2 by means of connecting nails 821 screwed into the screw holes 82. When the operating handle 6 is rotated from the first position to the second position, the driving plate 8 can rotate around the connecting nail 821 as a rotating shaft, and the left and right ends of the driving plate 8 can drive the front caster frame 21 and the front caster 22 of the two front caster units 2 to rotate from the folding storage position to the unfolding rolling position.

As shown in fig. 7, the rear caster unit 3 includes a rear fixing sleeve 31, a rotating block 33, a rear caster frame 34 and a rear caster 35, the rear fixing sleeve 31 is provided with a first through hole 311 and a second through hole 312 in a length direction thereof, the first through hole 311 and the second through hole 312 are distributed in parallel on the rear fixing sleeve 31, the rear fixing sleeve 31 is sleeved on the support tube 12 through the first through hole 311 and is connected and fixed with the support tube 12, the rear fixing sleeve 31 is provided with a notch, an upper portion of the rotating block 33 is provided with a collar, the collar is disposed in the notch and is rotatably connected with the rear fixing sleeve 31 through a connecting tube 32 penetrating through the second through hole 312, the rear caster frame 34 is connected and fixed with the rotating block 33, the rear caster 34 is rotatably mounted on the rear caster frame 34, the second resetting device is a second torsion spring 36, the second torsion spring 36 is sleeved on the connecting tube 32, And both ends of the second torsion spring 36 respectively abut against the rear fixing sleeve 31 and the rotating block 33, so as to provide acting force for the rotating block 33 to rotate relative to the rear fixing sleeve 31. A reinforcing plate 71 made of stainless steel is arranged on the inner side of the rear fixing sleeve 31, and a first locking hole 371 and a second locking hole 372 are arranged on the reinforcing plate.

As shown in fig. 8, the pushing handle 5 includes two vertical pipes, the vertical pipes are two-stage telescopic pipes, the telescopic pipes include lower sleeves 51 and upper sleeves 52, the top ends of the two upper sleeves 52 are connected with a third cross rod 36 for users to grasp, the top ends of the two lower sleeves 51 are connected with a second cross rod 54, an upper sleeve locking mechanism capable of locking the upper sleeve rod 52 is arranged on the second cross rod 54, and the upper sleeve locking mechanism includes a second lock rod and a second pressure spring arranged in the second cross rod 54, and a second control button arranged outside the second cross rod 54 and connected with the second lock rod. Lower adapter sleeve 56 is all overlapped to the lower part of two lower casings, promote handle 5 through the screw and the fixed cover 31 pin joint in back that pass lower adapter sleeve 56, lower casing 51, the fixed cover 31 in back and stay tube 12, be connected with first horizontal pole 53 between two lower adapter sleeves 56, locking mechanism is including arranging first locking lever 531, first pressure spring 533 in first horizontal pole 53 in to and locate first horizontal pole 53 outer first control button 532 of being connected with first locking lever 531, the standpipe is equipped with the through-hole in the position that corresponds first locking lever 531, the tip of first locking lever 531 can pass first lockhole 371 and the cooperation locking of second lockhole 372 that are equipped with on the reinforcing plate 37 of through-hole and the fixed cover 31 inboard in back and promote handle 5. The reinforcing rods are connected to the positions, below the lower sleeves, of the two lower sleeves, and therefore the structural strength of the pushing handle can be improved.

The working principle of the utility model is as follows:

as shown in fig. 9, when the operating handle 6 is rotated from the first position to the second position, the operating handle 6 drives the connecting rod 7 to drive the driving plate 8 to rotate around the connecting pin 821, so as to drive the front caster frame 21 of the front caster unit 1 to rotate from the folded storage position to the unfolded rolling position until the front caster frame is completely unfolded.

As shown in fig. 10, when the front caster frame 21 of the front caster unit 1 is fully opened, the lower portion of the lower sleeve 51 forces the rear fixing sleeve 31 of the rear caster unit 3 to rotate from the folded storage position to the unfolded rolling position until the front caster frame is fully opened, while the push handle 5 is rotated from the storage position alongside the load carrier 1 to the upright position with respect to the load carrier 1.

When the push handle 5 is rotated to an upright position with respect to the load carrier 1, as shown in fig. 11, the first lock pin 531 is inserted into the first lock hole 371 to lock the push handle 5, and the rear fixing sleeve 31 of the rear caster unit 3 is fully opened to the deployed and rolled position, completing the switching of the four-wheel flatbed cart mode.

As shown in fig. 12, when the first control button 532 is operated to unlock the push handle 5, the push handle 5 in the upright state with respect to the load carrier 1 is rotated continuously, and the push handle 5 is rotated to the parallel state with respect to the load carrier 1, the first lock rod 531 is inserted into the first lock hole 372 to lock the push handle 5, and the rear fixing sleeve 31 of the rear caster unit 3 is rotated and returned to the folded storage position by the second torsion spring 36, thereby completing the switching of the two-wheel cart mode.

The above-described embodiments of the present invention do not limit the scope of the present invention. Any modification, equivalent replacement, and improvement made within the spirit and scope of the present invention should be included in the protection scope of the claims of the present invention.

Claims (10)

1. The improved dual-purpose folding trolley is characterized by further comprising a front caster wheel unit rotation driving device, wherein the front caster wheel unit rotation driving device is arranged on the load carrier and can drive the front caster wheel unit to rotate and unfold to the load carrier A rolling position, the front caster wheel unit driving device comprises an operating handle, a connecting rod and a driving plate, the operating handle is pivoted with the load carrier and can rotate around an operating handle pivot axis, the connecting rod is connected with the operating handle, the driving plate is connected with the connecting rod and the front caster wheel unit, when the operating handle rotates from a first position to a second position, the operating handle can be linked with the driving plate through the connecting rod to drive the front caster wheel unit to rotate from a folding storage position to an unfolding rolling position, the front caster wheel unit is provided with a first resetting device, when the operating handle rotates from the second position to the first position, the front caster wheel unit can rotate from the unfolding rolling position to the folding storage position under the action of the resetting device, the pushing handle is arranged to drive the rear caster wheel unit to rotate from the folding storage position to the unfolding rolling position when the operating handle rotates from the storage position which is parallel to the load carrier to the upright relative to the load carrier, the rear caster wheel unit is provided with a second reset device, when the push handle rotates to the storage position which is parallel to the load carrier, the rear caster wheel unit can rotate to the folding storage position from the unfolding rolling position under the action of the reset device, the push handle is arranged to rotate to be vertical relative to the load carrier from the storage position which is parallel to the load carrier and can be locked by the push handle through a locking mechanism when continuing rotating in the same direction to be parallel to the load carrier.

2. The improved convertible folding cart of claim 1, wherein said load carrier includes a support frame and a bearing plate, said support frame includes two support tubes, said two support tubes are symmetrically disposed at left and right lateral positions of the bottom of the bearing plate, said front caster unit is mounted at a front position of the support tubes, and said rear caster unit is mounted at a rear position of the support tubes.

3. The improved dual-purpose folding handcart of claim 2, wherein the shovel plate is provided with a pivoting seat at a position corresponding to the front ends of the two support tubes, the pivoting seat is pivoted with the front ends of the support tubes, a compression spring and a positioning pin are sequentially embedded in the front-end tube of the support tubes, and the positioning pin can be abutted against the seat wall of the pivoting seat of the shovel plate under the action of the compression spring.

4. The improved convertible folding cart of claim 2, wherein said front caster unit comprises a front hub, a front caster frame and a front caster, said front hub having a recess, one end of said front caster frame being disposed in said recess, said front hub and said front caster frame being both mounted on said support tube and said front hub being fixedly connected to said support tube, said front caster being rotatably mounted on said front caster frame, said first return means being a first torsion spring, said first torsion spring being mounted on said support tube and said first torsion spring having opposite ends respectively abutting said front hub and said front caster frame to provide a force for rotation of said front caster frame relative to said front hub.

5. The improved dual-purpose foldable handcart as claimed in claim 4, wherein said operating handle includes a U-shaped handle body having two side arms of an integral structure and a handle disposed between said two side arms for connecting one end of each of said two side arms, a fixed base pivotally connected to a free end of said side arm and fixedly connected to a bottom of said bearing plate, a first protruding column disposed on an inner side of said side arm, a second protruding column disposed on an identical side of said fixed base, a tension spring disposed between said first protruding column and said second protruding column, two ends of said tension spring being respectively fixed to said first protruding column and said second protruding column, a connecting shaft disposed on an outer side of said side arm, one end of said connecting rod being pivotally connected to said operating handle through said connecting shaft, the other end of said connecting rod being pivotally connected to a side of said driving plate close to said operating handle, a side of said driving plate far from said operating handle being pivotally connected to a front fixing sleeve of said front caster unit through said connecting pin, when the drive plate rotates by taking the connecting nails as rotating shafts, the left end and the right end of the drive plate can drive the two front caster units to rotate from the folding storage position to the unfolding rolling position.

6. An improved dual purpose folding cart as recited in claim 5, wherein said front caster unit caster frame is provided with a snap post on an inner side thereof, said drive plate having a snap groove at an end thereof corresponding to said snap post, said snap post being configured to snap into said snap groove when said front caster unit is rotated to said extended rolling position.

7. The improved dual-purpose foldable handcart as recited in claim 1, wherein said rear caster unit comprises a rear fixing sleeve, a rotary block, a rear caster frame and a rear caster, said rear fixing sleeve having a first through hole and a second through hole along the length direction thereof, said first through hole and said second through hole being disposed in parallel on said rear fixing sleeve, said rear fixing sleeve being mounted on said support tube through said first through hole and being connected to said support tube, said rear fixing sleeve having a notch, said rotary block having a collar at the upper portion thereof, said collar being mounted in said notch and being rotatably connected to said rear fixing sleeve through a connecting tube passing through said second through hole, said rear caster frame being connected to said rotary block, said rear caster being rotatably mounted on said rear caster frame, said second restoring means being a second torsion spring mounted on said connecting tube and having both ends of said second torsion spring respectively abutting against said rear fixing sleeve and said rotary block, so as to provide acting force for the rotation of the rotating block relative to the rear fixing sleeve.

8. The improved dual-purpose foldable handcart of claim 7, wherein the pushing handle includes two vertical pipes, the top ends of the two vertical pipes are connected with a third cross rod for the user to grasp, the lower parts of the two vertical pipes are sleeved with lower connecting sleeves, the pushing handle is pivoted with the rear fixing sleeve by a screw passing through the lower connecting sleeves, the vertical pipes, the rear fixing sleeve and the supporting pipe, a first cross rod is connected between the two lower connecting sleeves, the locking mechanism includes a first locking rod and a first pressure spring arranged in the first cross rod, and a first control button arranged outside the first cross rod and connected with the first locking rod, the vertical pipes are provided with through holes at positions corresponding to the first locking rod, and the end part of the first locking rod can pass through the through holes and cooperate with locking holes arranged on the inner side of the rear fixing sleeve to lock the pushing handle.

9. The improved dual-purpose folding handcart of claim 8, wherein the vertical tube is a two-stage telescopic tube, the telescopic tube comprises a lower sleeve and an upper sleeve, the lower connecting sleeve is sleeved on the lower part of the lower sleeve, the top ends of the two lower sleeves are connected with a second cross rod, the second cross rod is provided with an upper sleeve locking mechanism capable of locking the upper sleeve rod, and the upper sleeve locking mechanism comprises a second locking rod arranged in the second cross rod, a second pressure spring and a second control button arranged outside the second cross rod and connected with the second locking rod.

10. The improved dual use folding cart of claim 9, wherein said two bottom tubes further have reinforcement bars attached thereto at locations below the bottom tubes.

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