CN214492981U - Improved multifunctional obstacle-surmounting trolley - Google Patents

Abstract

The utility model discloses an improved multifunctional obstacle-crossing handcart, which comprises a bearing plate, a handle, a baffle plate, a rear caster wheel unit and a driving device for driving the rear caster wheel unit to be opened, wherein the driving device comprises a pushing mechanism and two swing rods, one end of each swing rod is hinged with the bearing plate, the pushing mechanism comprises two vertical rods, a cross rod hinged at the lower ends of the two vertical rods and a handle arranged between the two vertical rods, the handle is rotatably connected with the bearing plate, two ends of the cross rod are hinged with the other end of each swing rod, the upper ends of the two vertical rods are respectively hinged with the left side wall and the right side wall of the handle, the lower end of the handle is telescopically provided with a lock rod, the vertical rods are provided with jacks at positions corresponding to the lock rods, the handle can be rotated downwards to drive the swing rods to push the rear caster wheel unit to rotate towards the opening direction, when the handle is rotated downwards to align with the lock rods, the rear caster wheel unit rotates to the opening state, meanwhile, the end parts of the lock rods are inserted into the jacks, so that the locking handle can not naturally rotate, guarantee rear truckle unit at the structural stability of open mode, stable in structure, the transportation is convenient.

Description

Improved multifunctional obstacle-surmounting trolley

Technical Field

The utility model belongs to the technical field of the transport means, concretely relates to multi-functional barrier handcart more of modified.

Background

The existing foldable trolley is generally provided with a driving device, and the driving device can drive the caster wheel unit to rotate, open and fold, so that the operation is convenient. But current drive arrangement rotates to under the open mode at drive truckle unit, because drive arrangement's structural stability is poor, when the handcart was gone or was crawled on the stair on the road surface of jolting, this road conditions can produce huge vibration to the handcart in the transportation is gone to make truckle unit can appear automatic folding phenomenon in the transportation, the structure is stable inadequately, and the transportation is inconvenient.

SUMMERY OF THE UTILITY MODEL

To the not enough among the above prior art, the utility model aims at providing a truckle unit opens stable multi-functional barrier handcart more.

In order to achieve the above purpose, the utility model discloses the technical scheme who takes does: an improved multifunctional obstacle-surmounting trolley comprises a bearing plate, a handle arranged at the front end of the bearing plate, a baffle arranged on the rear end of the bearing plate, rear trundle units which are arranged at the two opposite sides of the bottom surface of the rear end of the bearing plate and can be opened and folded relative to the bearing plate in a rotating manner, and a driving device capable of driving the rear trundle units to rotate and open;

the driving device comprises a pushing mechanism arranged below the bearing plate and two swing rods connected with the pushing mechanism, the two swing rods are oppositely arranged and are respectively positioned at the inner side positions of the rear caster units, one ends of the swing rods are hinged with the bearing plate, the pushing mechanism is pushed to enable the swing rods to rotate, and the other ends of the swing rods can push the rear caster units to rotate and open;

the pushing mechanism comprises two vertical rods which are arranged oppositely, a cross rod which is hinged at the lower ends of the two vertical rods and a handle which is arranged between the two vertical rods, the handle is of a U-shaped structure, one end of an opening of the U-shaped handle is hinged with the bottom surface of the bearing plate through a rotating shaft, so that the handle can rotate around the rotating shaft relative to the bearing plate, the upper ends of the two vertical rods are respectively hinged at the left and right outer side walls of the handle, the two ends of the cross rod are respectively hinged with the corresponding swing rods, the lower end of the handle is provided with a lock rod in a telescopic way, the vertical rods are provided with jacks at the positions corresponding to the lock rods, the handle can be rotated downwards to drive the vertical rods to simultaneously rotate so as to drive the caster units to rotate towards the opening direction after the swing rods push the caster units, when the handle is rotated downwards to the position where the lock rod is opposite to the jack, the end part of the lock rod can extend out of the outer side wall of the handle and be inserted into the jack of the vertical rod, the swing rod pushes the rear caster wheel unit to rotate to an open state, and the handle is rotated upwards to drive the swing rod to rotate to a folded state towards the direction of the bearing plate.

In the above scheme, through the scalable locking lever that is provided with at the handle lower extreme, truckle unit rotates to the open mode after the pendulum rod promotes, and the locking lever of handle inserts in the jack of montant, the locking lever of handle this moment just can be restricted by the jack of montant and make the handle unable rotation, just so makes the pendulum rod can not automatic rotation folding, guarantees the stability of opening of back truckle unit. When the caster unit needs to be folded, the lock rod is firstly separated from the jack, then the handle is rotated to drive the swing rod to rotate towards the bearing plate to a folded state, and then the caster unit can be folded after rotation.

Furthermore, the lower end of the handle is provided with a sliding groove, the locking rod is arranged in the sliding groove and can slide relative to the sliding groove, a spring is further arranged in the sliding groove, the spring can bounce the outer end part of the locking rod to slide out of the sliding groove in a natural state, the locking rod is further connected with a switch, the switch is positioned on the outer side of the handle, and the outer end part of the locking rod can slide into the inner side of the sliding groove by pressing the switch. The spring in this scheme can contradict the locking lever and avoid the locking lever to break away from the jack automatically, and the locking is firm, and presses the switch and can make the locking lever break away from the jack, convenient operation.

In order to facilitate the connection of the switch and the lock rod, the lower end of the handle is provided with an installation groove, the installation groove is covered with a cover body, the sliding groove is arranged in the installation groove, the sliding groove is communicated from the left side wall of the handle to the right side wall of the handle, the lock rod is provided with two lock rods which are respectively arranged at two ends of the sliding groove, the spring is arranged in the sliding groove and corresponds to the position between the two lock rods, two ends of the spring respectively abut against the inner ends of the two lock rods so as to eject the outer ends of the lock rods out of the sliding groove, the switch is of a U-shaped structure, one end of an opening of the switch is inserted into the installation groove and can slide up and down relative to the installation groove, the lock rod corresponds to one side wall opposite to the switch and is provided with an avoidance groove, two sides of one end of the opening of the switch are respectively provided with push blocks, one side opposite to the two push blocks are respectively inserted into the avoidance grooves of the corresponding lock rods, and the inclined surfaces of the push blocks abut against the side walls of the avoidance grooves, the side wall of the avoiding groove of the lock rod can move along the inclined plane of the push block by pressing the switch downwards, so that the outer ends of the two lock rods slide into the inner side of the sliding groove.

Furthermore, the outer end part of the lock rod is provided with a guide inclined plane corresponding to the end surface and the lower corner position of the lock rod, when the handle is rotated downwards until the guide inclined plane of the lock rod is abutted against the side surface of the vertical rod, the guide inclined plane of the lock rod can slide along the side surface of the vertical rod, so that the outer end of the lock rod automatically slides into the sliding groove.

Furthermore, a fixing rod is arranged in the middle of the handle, and the two ends of the fixing rod penetrate through the left side wall and the right side wall of the handle and are hinged to the upper ends of the two vertical rods respectively, so that the connection stability of the two vertical rods and the handle can be improved.

Furthermore, the position of the bottom surface of the bearing plate, corresponding to the fixing rod, is provided with a buckling position, when the handle is rotated upwards to enable the swing rod to rotate to the folded state, the fixing rod of the handle is buckled into the buckling position, so that the structural stability of the swing rod in the folded state can be improved, and the swing rod is prevented from being automatically rotated and opened.

Furthermore, the lateral walls opposite to the two vertical rods are provided with the positioning blocks, when the handle is rotated downwards to be parallel to the vertical rods, the bottom surface of the handle is abutted to the positioning blocks, meanwhile, the lock rod of the handle is aligned with the jack position of the vertical rods, the handle is prevented from rotating downwards excessively, the structure is more stable, meanwhile, the lock rod is convenient to align to the jack position, and the positioning is convenient.

Furthermore, foretell back truckle unit is including articulating the back foot rest that hinges the bottom surface rear end both sides position of bearing plate respectively, with the triangle wheel carrier of back foot rest outer end rotation connection, wrapping up respectively and connecting in the back truckle of triangle wheel carrier three-terminal and can let the back foot rest reset to fold condition's elastic component, is equipped with the back truckle through the three-terminal at the triangle wheel carrier, can make things convenient for the handcart to creep and stride across the barrier like this, and it is more convenient to transport. The swing rods are located at the inner side positions of the corresponding rear foot rests, the handle is rotated downwards to drive the swing rods to push the rear foot rests to rotate and open, and when the handle is rotated upwards to drive the swing rods to rotate and fold, the elastic pieces can automatically reset the rear foot rests to rotate to a folded state, so that the folding is convenient.

Furthermore, the side wall of the swing rod is provided with a clamping groove, the inner side wall of the rear foot rest is provided with a positioning buckle, when the swing rod pushes the rear foot rest to rotate to an open state, the clamping groove of the swing rod is buckled with the positioning buckle of the rear foot rest, the swing rod is prevented from being opened through excessive rotation, and the opening stability of the rear foot wheel unit is further improved.

Furthermore, the trolley further comprises a front caster unit and a driving device for driving the front caster unit to rotate and open, wherein the front caster unit comprises front foot frames respectively hinged to two sides of the front end of the bottom surface of the bearing plate, front casters rotatably connected to the outer ends of the front foot frames, and an elastic piece capable of enabling the front caster frames to return to a folded state, so that the trolley can be changed into a flat trolley with four wheels for use, the front caster units can also be folded, and only the rear caster units are unfolded to be used as a two-wheeled trolley.

The utility model discloses a barrier handcart more's beneficial effect does: 1. through inserting the locking lever in the jack to guarantee that the handle can not automatic rotation, locking truckle unit is in the open mode, guarantees that the handcart can not appear automatic folding phenomenon under the vibration on the road surface of jolting, and the transportation is convenient. 2. The lock rod can be separated from the jack by pressing the switch, so that the handle can be rotated to fold the caster unit, and the unlocking is convenient. 3. The locating piece can avoid the handle to excessively rotate downwards, and the location buckle can avoid the excessive rotation of pendulum rod to open, and structural stability is good. 4. Can make things convenient for the handcart to crawl and stride across the barrier through the triangle wheel carrier, just the utility model discloses the handcart can also be switched at will between two-wheeled handcart and four-wheel flat handcart and use, and it is more convenient to transport.

Drawings

Fig. 1 is a structural schematic diagram of the folding state of the swing rod of the trolley of the present invention.

Fig. 2 is the structural schematic diagram of the trolley in a half-open state of the swing rod.

Fig. 3 is an enlarged view of a portion a in fig. 2.

Fig. 4 is the structural schematic diagram of the trolley according to the present invention in the open state of the swing rod.

Fig. 5 is an exploded schematic view of the driving device of the cart of the present invention.

Fig. 6 is a schematic structural view of the locking rod of the cart of the present invention separating from the insertion hole.

Fig. 7 is a schematic structural view of the locking rod of the cart according to the present invention inserted into the insertion hole.

Fig. 8 is an enlarged view of a portion B in fig. 2.

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.

Examples

As shown in fig. 1-5, the present embodiment provides an improved multifunctional obstacle crossing handcart, which includes a bearing plate 1, a handle 2 disposed at the front end of the bearing plate 1, a baffle 3 disposed at the upper side of the rear end of the bearing plate 1, a caster unit disposed below the bearing plate 1 and capable of being opened and folded by rotating relative to the bearing plate 1, and a driving device capable of driving the caster unit to rotate and open. The handle 2 and the baffle 3 are hinged with the bearing plate 1, so that the handle 2 and the baffle 3 can rotate relative to the bearing plate 1 to be opened and folded. The caster units comprise front caster units and rear caster units, each rear caster unit comprises a rear foot rest 41 respectively hinged to two sides of the rear end of the lower surface of the bearing plate 1, a triangular wheel frame 42 rotatably connected with the outer side wall of the outer end of the rear foot rest 41, rear casters 43 respectively wrapped and connected to three ends of the triangular wheel frame 42, and an elastic part capable of enabling the rear foot rest 42 to return to a folded state; the front caster unit comprises a front caster 51 hinged to two sides of the front end of the lower surface of the bearing plate 1, a front caster 52 rotatably connected to the outer end of the front caster 51, and an elastic member for restoring the front caster 51 to a folded state.

The elastic parts are torsional springs fixed on the foot rests, one ends of the torsional springs are abutted to the bearing plate 1, the other ends of the torsional springs are abutted to the foot rests, and when the torsional springs are in a natural state, the foot rests can be reset to a folded state through the self elastic action of the torsional springs.

The driving devices are two, the two driving devices are respectively used for driving the front caster unit and the rear caster unit to rotate and open, the driving devices comprise a pushing mechanism arranged below the bearing plate 1 and two swing rods 62 connected with the pushing mechanism, one end of each swing rod 62 is hinged with the lower side of the bearing plate 1, each pushing mechanism comprises two vertical rods 611 arranged oppositely, a cross rod 612 hinged with the lower ends of the two vertical rods 611 and a handle 7 arranged between the two vertical rods 611, each handle 7 is of a U-shaped structure, one open end of each U-shaped handle 7 is hinged with the bottom surface of the bearing plate 1 through a rotating shaft 70 so that the handle 7 can rotate relative to the bearing plate 1 around the rotating shaft 70, the upper ends of the two vertical rods 611 are respectively hinged to the middle positions of the left outer side wall and the right outer side wall of each handle 7, the two ends of each cross rod 612 are respectively hinged with the corresponding upper end of each swing rod 62, the lower end of each handle 7 is provided with an installation groove 710, and a cover body is covered by the installation groove 710, and the mounting slot 710 is internally provided with a sliding chute 77, the sliding chute 77 penetrates from the left side wall of the handle 7 to the right side wall of the handle 7, the sliding chute 77 is internally provided with two locking rods 75 and a spring 771, the two locking rods 75 are respectively positioned at two ends of the sliding chute 77, the spring 771 is arranged in the sliding chute 77 corresponding to the position between the two locking rods 75, two ends of the spring 771 are respectively abutted against the inner ends of the two locking rods 75, and the spring 771 can eject the outer ends of the two locking rods 75 out of the sliding chute 77 in a natural state. The locking bar 75 is further connected with a switch 751, the switch 751 extends out of the handle 7, and the outer ends of the two locking bars 75 slide into the sliding grooves 77 by pressing the switch 751. The vertical bar 611 is provided with an insertion hole 6110 at a position corresponding to the lock bar 75, and when the lock bar 75 is opposite to the insertion hole 6110, the outer end of the lock bar 75 can be inserted into the insertion hole 6110.

The utility model discloses a handcart rotates each foot rest to the open mode under fold condition when needs, can press earlier switch 751 with the outer end of two locking levers 75 in sliding into spout 77, then it rotates simultaneously to rotate handle 7 and drive montant 611, and montant 611 pivoted simultaneously can drive horizontal pole 612 transmission and rotate to the direction of keeping away from bearing plate 1 in pendulum rod 62, so that the lateral wall of pendulum rod 62 promotes the corresponding foot rest to open the direction and rotate, when rotating handle 7 to locking lever 75 and jack 6110 position relatively in right time downwards, can loosen switch this moment, spring 771 just can pop out spout 77 lateral wall with the outer end of two locking levers 75 and insert in the jack 6110 of montant 611 simultaneously, pendulum rod 62 can be promoted to the open mode by horizontal pole 612 this moment, and pendulum rod 62 can promote corresponding foot rest simultaneously and rotate to the open mode, thereby accomplish the operation of opening of each foot rest. The lock rod 75 is inserted into the insertion hole 6110, so that the handle 7 can be locked to ensure that the handle 7 cannot rotate continuously, and each foot stand can be locked in an open state, and the foot stand locking device is stable in structure and convenient to transport. When the foot rests are required to be folded, the switch 751 is pressed to separate the lock bar 75 from the insertion hole 6110, then the handle 7 is rotated upwards to drive the swing bar 62 to rotate towards the bearing plate 1 to a folded state, and meanwhile, the foot rests can automatically reset to the folded state under the action of the elasticity of the torsion spring, so that the folding operation of the foot rests is completed.

As shown in fig. 5 to 7, the switch 751 is U-shaped, one end of the opening of the switch 751 is inserted into the mounting slot 710 and can slide up and down relative to the mounting slot 710, and the closed end of the switch 751 is located outside the handle 7. Two sides of one end of the opening of the switch 751 are respectively provided with a push block 7511, one side of the opposite side of the two push blocks 7511 is of an inclined surface structure, the lock bar 75 is provided with an avoiding groove 752 corresponding to one side wall of the opposite side of the switch 751, the two push blocks 7511 are respectively inserted into the avoiding grooves 752 of the corresponding lock bars 75, the inclined surface structure of the push blocks 7511 is abutted against the side wall of the avoiding groove 752, when the switch 751 is pressed downwards, the side wall of the avoiding groove 752 of the lock bar 75 can move along the inclined surface of the push block 7511, so that the two lock bars 75 compress the spring 771 and slide into the inner side of the sliding groove 77, and when the switch 751 is released, the spring 771 can bounce the outer ends of the two lock bars 75 to slide out of the sliding groove 77 under the action of the self 751.

As shown in fig. 2, 3 and 4, the outer end of the lock lever 75 is provided with a guiding inclined surface 750 corresponding to the corner between the end surface and the lower surface thereof, when the handle 7 is rotated downward until the guiding inclined surface 750 of the lock lever 75 abuts against the side surface of the vertical bar 611, the guiding inclined surface 750 of the lock lever 75 slides along the side surface of the vertical bar 611 to automatically slide the outer end of the lock lever 75 into the sliding groove 77, so that when the handle 7 is rotated downward, the outer end of the lock lever 75 can be inserted into the insertion hole 6110 without pressing the switch 751 to avoid the side surface of the vertical bar 611 to block. The two opposite side walls of the two vertical bars 611 are respectively provided with a positioning block 6111, when the handle 7 is rotated downwards to be parallel to the vertical bars 611, the bottom surface of the handle 7 is abutted to the positioning blocks 6111, and meanwhile, the lock rod 75 of the handle 7 is aligned with the insertion hole 6110 of the vertical bars 611, so that the handle 7 is prevented from excessively rotating downwards, the structure is more stable, meanwhile, the lock rod 75 is convenient to align to the insertion hole 6110, and the positioning is convenient.

As shown in fig. 1, the fixing rod 78 is disposed in the middle of the handle 7, and two ends of the fixing rod 78 penetrate through the left and right side walls of the handle 7 and are hinged to the upper ends of the two vertical bars 611, so that the connection stability between the two vertical bars 611 and the handle 7 can be improved. The position of the bottom surface of the bearing plate 1 corresponding to the fixing rod 78 is provided with a buckling position 781, when the handle 7 is rotated upwards to rotate the swing rod 62 to the folded state, the fixing rod 78 of the handle 7 can be buckled in the buckling position 781, so that the handle 7 is locked and cannot rotate naturally, and the structural stability of the swing rod 62 in the folded state can be improved.

As shown in fig. 2, 4 and 8, a clamping groove 621 is disposed on a side wall of the swing rod 62, and a positioning buckle 411 is disposed on an inner side wall of the rear foot rest 41, when the swing rod 62 pushes the rear foot rest 41 to rotate to an open state, the clamping groove 621 of the swing rod 62 is buckled with the positioning buckle 411 of the rear foot rest 41, so that the swing rod 62 is prevented from being opened by excessive rotation, and the opening stability of the rear foot rest 41 is ensured.

The above is only a specific embodiment of the present invention, but the design concept of the present invention is not limited thereto, and the design concept of the present invention is right, the insubstantial modification made by the present invention all falls into the protection scope of the present invention.

Claims (10)

1. An improved multifunctional obstacle-surmounting trolley comprises a bearing plate (1), a handle (2) arranged at the front end of the bearing plate (1), a baffle (3) arranged on the rear end of the bearing plate (1), a rear trundle unit which is arranged at the two opposite side positions of the bottom surface of the rear end of the bearing plate (1) and can be opened and folded relative to the bearing plate (1) in a rotating manner, and a driving device capable of driving the rear trundle unit to rotate and open;

drive arrangement is including locating push mechanism below bearing plate (1) and two pendulum rods (62) of being connected with push mechanism, and two pendulum rods (62) set up relatively and are located the inboard position of the rear foot wheel unit that corresponds respectively, and the one end of pendulum rod (62) is articulated with bearing plate (1), and promotion push mechanism enables pendulum rod (62) to rotate to the other end that makes pendulum rod (62) can promote the rear foot wheel unit and rotate and open its characterized in that:

the pushing mechanism comprises two vertical rods (611) which are arranged oppositely, a cross rod (612) which is hinged to the lower ends of the two vertical rods (611) and a handle (7) which is arranged between the two vertical rods (611), the handle (7) is of a U-shaped structure, one open end of the U-shaped handle (7) is hinged to the bottom surface of the bearing plate (1) through a rotating shaft (70) so that the handle (7) can rotate relative to the bearing plate (1) around the rotating shaft (70), the upper ends of the two vertical rods (611) are respectively hinged to the left outer side wall and the right outer side wall of the handle (7), two ends of the cross rod (612) are respectively hinged to corresponding swing rods (62), the lower end of the handle (7) is provided with a lock rod (75) in a telescopic mode, the vertical rods (611) are provided with inserting holes (6110) in positions corresponding to the lock rods (75), the handle (7) can be rotated downwards to drive the vertical rods (611) to simultaneously rotate and drive the caster units to rotate towards the opening direction after the swing rods (62) push the caster units, when the handle (7) is rotated downwards until the position of the lock rod (75) is opposite to the position of the jack (6110), the end part of the lock rod (75) can extend out of the outer side wall of the handle (7) and be inserted into the jack (6110) of the vertical rod (611), at the moment, the swing rod (62) pushes the rear caster wheel unit to rotate to an open state, and the handle (7) is rotated upwards to drive the swing rod (62) to rotate to a folded state towards the direction of the bearing plate (1).

2. The improved multifunctional obstacle crossing trolley as claimed in claim 1, wherein a sliding groove (77) is formed in the lower end of the handle (7), the locking rod (75) is arranged in the sliding groove (77) and can slide relative to the sliding groove (77), a spring (771) is further arranged in the sliding groove (77), the spring (771) can bounce the outer end portion of the locking rod (75) to slide out of the outer side of the sliding groove (77) in a natural state, the locking rod (75) is connected with a switch (751), the switch (751) is located on the outer side of the handle (7), and the outer end portion of the locking rod (75) can slide into the inner side of the sliding groove (77) by pressing the switch (751).

3. The improved multifunctional obstacle crossing trolley as claimed in claim 2, wherein the lower end of the handle (7) is provided with a mounting slot (710), the mounting slot (710) is covered with a cover body (711), the sliding groove (77) is arranged in the mounting slot (710), the sliding groove (77) penetrates from the left side wall of the handle (7) to the right side wall of the handle (7), the two locking rods (75) are provided, the two locking rods (75) are respectively positioned at two ends of the sliding groove (77), the spring (771) is arranged in the sliding groove (77) and corresponds to a position between the two locking rods (75), two ends of the spring (771) are respectively abutted against the inner ends of the two locking rods (75) so as to eject the outer end of the locking rod (75) out of the sliding groove (77), the switch (751) is of a U-shaped structure, one end of an opening of the switch (751) is inserted into the mounting slot (710) and can slide up and down relative to the mounting slot (710), the lock rod (75) is provided with an avoiding groove (752) corresponding to one side wall opposite to the switch (751), two sides of one end of the opening of the switch (751) are respectively provided with a pushing block (7511), one side of the two pushing blocks (7511) opposite to each other is of an inclined surface structure, the two pushing blocks (7511) are respectively inserted into the avoiding groove (752) of the corresponding lock rod (75), the inclined surface of the pushing block (7511) is abutted against the side wall of the avoiding groove (752), and the switch (751) is pressed downwards to enable the side wall of the avoiding groove (752) of the lock rod (75) to move along the inclined surface of the pushing block (7511) so that the outer ends of the two lock rods (75) slide into the inner side of the sliding groove (77).

4. The improved multifunctional obstacle crossing handcart as recited in claim 3, wherein the outer end of said lock rod (75) is provided with a guide slope (750) corresponding to the corner between its end face and the lower face.

5. The improved multifunctional obstacle crossing trolley as claimed in claim 2, wherein a fixing rod (78) is arranged in the middle of the handle (7), and two ends of the fixing rod (78) penetrate through the left side wall and the right side wall of the handle (7) and are respectively hinged with the upper ends of the two vertical rods (611).

6. The improved multifunctional obstacle crossing trolley as recited in claim 5, wherein a buckling position (781) is provided on the bottom surface of the bearing plate (1) corresponding to the position of the fixing rod (78), and when the handle (7) is rotated upwards to rotate the swing link (62) to the folded state, the fixing rod (78) of the handle (7) is buckled in the buckling position (781).

7. The improved multifunctional obstacle crossing trolley as recited in claim 1, wherein the opposite side walls of the two vertical bars (611) are provided with positioning blocks (6111), when the handle (7) is rotated downwards to be parallel to the vertical bars (611), the bottom surface of the handle (7) is abutted against the positioning blocks (6111), and simultaneously the locking rod (75) of the handle (7) is aligned with the insertion holes (6110) of the vertical bars (611).

8. The improved multifunctional obstacle crossing trolley as recited in claim 1, wherein the rear caster unit comprises rear casters (41) respectively hinged to two sides of the rear end of the bottom surface of the bearing plate (1), a triangular wheel frame (42) rotatably connected to the outer end of the rear casters (41), rear casters (43) respectively wrapped and connected to three ends of the triangular wheel frame (42), and an elastic member capable of restoring the rear casters (41) to a folded state, the swing link (62) is located at the inner side of the corresponding rear casters (41), and the handle (7) is rotated downward to drive the swing link (62) to push the rear casters (41) to rotate and open.

9. The improved multifunctional obstacle crossing handcart as recited in claim 8, wherein said swing link (62) has a slot (621) on its side wall, said rear foot rest (41) has a positioning buckle (411) on its inner side wall, and when said swing link (62) pushes said rear foot rest (41) to rotate to the open position, said slot (621) of said swing link (62) is buckled with said positioning buckle (411) of said rear foot rest (41).

10. The improved multifunctional obstacle crossing handcart as recited in claim 1, further comprising a front caster unit and a driving device for driving the front caster unit to rotate and open, wherein the front caster unit comprises a front caster (51) hinged to two sides of the front end of the bottom surface of the bearing plate (1), a front caster (52) rotatably connected to the outer end of the front caster (51), and an elastic member for restoring the front caster (51) to a folded state.

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