Portable trolley

Abstract

The invention relates to the technical field of walking-aid carts for old people, and discloses a portable trolley which comprises a front foot assembly, and front rolling wheels are symmetrically arranged at the bottom of the portable trolley; the top of the rear foot assembly inclines upwards and is hinged to the top of the front foot assembly, and rear rollers are symmetrically arranged at the bottom end; the bottom of the backrest assembly is connected to the inner side of one end, close to the rear roller, of the rear leg assembly; the rear side of the seat surface is rotationally connected to the backrest assembly, and the front side is coaxially hinged to the tops of the front foot assembly and the rear foot assembly; the folding supporting mechanism is rotationally connected with the rear leg assembly and rotates forwards and backwards around the rear leg assembly to drive the front leg assembly, the backrest assembly and the seat surface to be unfolded and folded; the problems that in the prior art, a cart is not fixed after being folded and is prone to rotating and scattering during carrying, and carrying and storage are not facilitated are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of walking aids for the elderly, and particularly to a portable trolley. Background Art

[0002] In daily life, trolleys are often provided for infants and young children. For example, CN106428181B, a children's trolley, is convenient for pushing a baby to take a walk; As society gradually ages, it is extremely inconvenient to go out or take the elderly out. Due to their old age and physical weakness, they often need to walk, stop, or immediately sit down to rest, which brings great difficulties and troubles to the elderly when going out. To solve the troubles of the elderly going out, our company once set up a multifunctional and portable trolley that can facilitate the elderly or people with mobility difficulties to go out. For example, CN221129749U, a portable toilet and bathing chair, still has some deficiencies in the use process. For example, the small wheel structure is only suitable for relatively flat roads, and its stability and obstacle-crossing ability are insufficient for relatively rough roads; since the two front footrests rotate and fold in the annular limit holes relative to the rear footrests, they are not fixed after folding and are prone to rotate and spread during handling, which is not conducive to handling and storage. Summary of the Invention

[0003] In view of the deficiencies of the prior art, the present invention provides a portable trolley, which has a simple structure, is convenient and quick to disassemble and assemble, has a firm support, is flexible and practical, is not easy to spread after being easily folded, occupies a small space, is convenient to take and place, and is convenient to carry, and can better assist the elderly or people with mobility difficulties to travel.

[0004] To achieve the above object, the present application adopts the following technical solutions.

[0005] The present invention is a portable trolley, including A front foot component, with front rollers symmetrically arranged at the bottom; A rear foot component, with the top inclined upwards and hinged to the top of the front foot component, and rear rollers symmetrically arranged at the bottom end; A backrest component, with the bottom connected to the inner side of the rear foot component near one end of the rear roller through a folding support mechanism; A seat surface, with the rear side rotatably connected to the backrest component, and the front side coaxially hinged to the tops of the front foot component and the rear foot component; The folding support mechanism is rotatably connected to the rear foot component and rotates back and forth around the rear foot component to drive the front foot component, the backrest component, and the seat surface to unfold and fold.

[0006] The further improvement lies in that: the folding support mechanism includes: a support swing rod connecting the rear foot assembly and the backrest assembly, a limit wrench arranged at one end of the support swing rod, a limit pin adapted to the limit wrench, and a connecting rod connecting the bottom of the support backrest assembly and the front foot assembly. The limit pin is arranged on the rear foot assembly outside the swinging end of the support swing rod. One end of the support swing rod is rotatably connected to the rear foot assembly, and the other end is rotatably connected to the backrest assembly and can be rotatably folded and unfolded back and forth relative to the rear foot assembly.

[0007] The further improvement lies in that: the front foot assembly includes front foot tubes symmetrically and parallelly arranged and a front foot connecting tube transversely connecting the two front foot tubes. The bottom end of the front foot tube is detachably connected to the front roller. The top of the front foot tube is bent backward and provided with a connecting through hole for hinged fixation with the top of the rear foot assembly. The connecting rod is arranged inside the bottom of the front foot tube and above the front foot connecting tube.

[0008] The further improvement lies in that: a connecting lug is arranged at the middle position of the front foot connecting tube, and a footrest assembly is rotatably arranged on the connecting lug. The footrest assembly is composed of a footrest tube frame and a foot plate arranged at the bottom of the footrest tube frame. A rotating shaft adapted to the connecting lug is arranged above the footrest tube frame, and the top of the footrest tube frame rotatably abuts against the inside of the front foot connecting tube.

[0009] The further improvement lies in that: the rear foot assembly includes: two symmetrically arranged rear flat fork tubes and a flat fork connecting tube connecting the two rear flat fork tubes. The bottom of the rear side of the rear flat fork tube is fixedly connected to the rear roller. The top of the front side of the rear flat fork tube is hinged to the outside of the top of the front foot tube. Two symmetrically arranged swing rod brackets adapted to the support swing rod are arranged on the two rear flat fork tubes. Swing rod brackets are arranged on the rear flat fork tubes on both sides of the swing rod bracket, and a clamping groove adapted to the support swing rod is arranged on the swing rod bracket. The limit wrench is coaxially arranged outside the connection end of the support swing rod and the backrest assembly and is adapted to be snap-fitted with the limit pin on one side of the swing rod bracket. The limit wrench includes a connecting portion, a grip portion, a snap groove arranged between the connecting portion and the grip portion, and a limit convex block extending along one side of the snap groove. The snap groove is adapted to be snap-fitted with the limit pin.

[0010] The further improvement lies in that: the rear foot assembly further includes a footrest push rod arranged at the bottom end of one rear flat fork tube. One end of the footrest push rod is arranged perpendicular to the rear flat fork tube, and the other end is bent upward and extends backward parallel to the rear roller beyond the maximum outer diameter of the rear roller.

[0011] The further improvement lies in that: the backrest assembly includes: a backrest tube connected to the inner side of the rear foot assembly, a push handle tube connecting the tops of the two backrest tubes, a backrest connecting tube connecting the bottoms of the two backrest tubes, and a backrest pad arranged between the two backrest tubes. The bottom of the backrest tube is rotatably supported and connected to the inner side of the rear flat fork tube through a support swing rod. The inner side of the bottom of the backrest tube is connected to the front foot tube through a connecting rod, and a triangular stable support is formed between the front foot tube and the rear flat fork tube. The connecting rod and the support swing rod are respectively arranged on the front and rear, inner and outer opposite sides of the backrest tube to form a stable support for the backrest tube. When folding, pull the limit wrench to disengage the limit pin buckle. After the support swing rod rotates 180 degrees around the swing rod bracket and is adaptively buckled and limited with the swing rod bracket on the other side, it drives the support swing rod, the bottom end of the backrest assembly, the connecting rod, and the bottom of the front foot assembly connected to the connecting rod to fold towards the bottom of the rear flat fork tube, and at the same time drives the hinge joints of the front foot assembly, the rear foot assembly, and the seat surface to fold towards the upper part of the backrest assembly.

[0012] The further improvement lies in that: the seat surface includes: a seat surface bracket and a seat board arranged above the seat surface bracket. Symmetric connecting supports are provided on the front side of the seat surface bracket. The rear end of the seat surface bracket is symmetrically provided with connecting parts rotatably connected to the outer sides of the two backrest tubes. The connecting supports are coaxially installed between the front foot tube and the rear flat fork tube.

[0013] The further improvement lies in that: it further includes a braking system. The braking system includes: a braking operation part arranged at the top of the backrest assembly, a braking brake arranged at the rear side of the rear foot assembly and adapted to abut against the rear roller, a brake wire support part, a reset part, and a brake wire connecting the braking operation part and the braking brake. The braking brake is rotatably connected to the outer side of the rear flat fork tube, and an outer folding brake handle is provided at the top and adapted to the rear roller. The bottom is bent inward with a brake wire fixing structure. The brake wire support part is suspended below the rear flat fork tube and inside the braking brake and corresponds to the brake wire fixing structure. The brake wire support part is provided with a wire threading structure. The reset part is a reset spring arranged between the brake wire fixing structure and the brake wire support part.

[0014] The further improvement lies in that: it further includes armrest assemblies symmetrically arranged on both sides of the backrest assembly and turning up and down relative to the backrest assembly.

[0015] Compared with the prior art, the beneficial effects of the present invention are: By arranging a folding support mechanism between the front foot assembly, the rear foot assembly, and the backrest assembly, the trolley is convenient to unfold and fold, and the support is stable, firm and reliable. After folding, it occupies a small space, is not easy to loosen and is convenient to carry; During the unfolding process, the limiting wrench is pulled to lock with the limiting pin buckle. The backrest assembly, front foot assembly, rear foot assembly, and seat surface unfold under the support of the support swing rod and the connecting rod. The front foot tube is connected to the bottom inner side of the backrest tube through the connecting rod, and the front foot tube and the rear flat fork tube form a triangular stable support. By arranging the connecting rod and the support swing rod on the front and rear, inner and outer opposite sides of the backrest tube, the backrest tube forms a stable support, thereby ensuring stable and reliable support and improving the bearing capacity of the stroller. By setting the front and rear rollers with different diameters, the adaptability of the present application to different road surfaces and the obstacle-crossing performance are improved, and at the same time, the comfort of the trolley experience is enhanced. When folding, by pulling the limiting wrench to disengage the limiting pin buckle, the support swing rod rotates 180 degrees around the swing rod bracket and is snap-fitted and limited with the swing rod bracket on the other side, driving the bottom of the support swing rod, the bottom end of the backrest assembly, the connecting rod, and the bottom of the front foot assembly connected to the connecting rod to fold towards the bottom of the rear flat fork tube. At the same time, it drives the hinge joints of the front foot assembly, the rear foot assembly, and the seat surface to fold towards the upper part of the backrest assembly. By setting the support swing rod to rotate 180 degrees around the swing rod bracket and be snap-fitted and limited with the swing rod bracket on the other side, it effectively prevents the problem of easy loosening after folding, which affects handling and storage. When unfolding from the fixed state for folding, only by operating the limiting wrench can the locking of the support swing rod be released, which is more practical, more convenient, and the folding support structure is stable and not easy to loosen. Through the footrest push rod at the bottom end of the rear flat fork tube, when it is necessary to cross an obstacle during pushing, the pusher steps on the end of the footrest push rod with the foot to lift the front roller. The other end of the footrest push rod bends upward and extends parallel to the rear roller and extends beyond the maximum outer diameter of the rear roller. After folding, the extended part of the footrest push rod can form a stable triangular support surface with the two rear wheels, so as to facilitate standing placement after folding. Brief Description of the Drawings

[0016] Figure 1 It is a schematic three-dimensional structure diagram of the present invention.

[0017] Figure 2 It is an exploded schematic diagram of the components of the present invention.

[0018] Figure 3 It is an enlarged view of the folding support mechanism of the present invention.

[0019] Figure 4 It is a schematic diagram of the limiting wrench of the present invention.

[0020] Figure 5 It is a schematic diagram of the folded state of the present invention.

[0021] Figure 6 It is another schematic diagram of the folded state of the present invention.

[0022] Reference Signs in the Drawings: Front foot assembly 1, front foot tube 11, front foot connecting tube 12, connecting lug 13 Rear foot assembly 2, rear swingarm tube 21, swingarm connecting tube 22, swing rod bracket 23, swing rod support 24, Backrest assembly 3, backrest tube 31, push handle tube 32, backrest cushion 33, backrest connecting tube 34, Seat surface 4, seat surface bracket 41, connecting support 42, seat board 43, Armrest assembly 5, braking system 6, brake operating member 61, braking brake 62, brake cable support member 63, reset member 64, Folding support mechanism 7, support swing rod 71, limit wrench 72, connecting portion 721, snap groove 722, limit projection 723, grip portion 724, limit pin 73, connecting rod 74, footrest assembly 8, footrest tube bracket 81, footboard 82, footrest push rod 9. Detailed implementation mode

[0023] To deepen the understanding of the present invention, the present invention will be further described in detail below in conjunction with the drawings. This embodiment is only used to explain the present invention and does not constitute a limitation on the protection scope of the present invention.

[0024] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the combination or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0025] The present invention will be further described below in conjunction with the drawings and embodiments.

[0026] Figure 1-6 Shown is a portable handcart, including: front foot assembly 1, front rollers are symmetrically arranged at the bottom. The front foot assembly 1 includes front foot tubes 11 arranged symmetrically and parallelly and a front foot connecting tube 12 that horizontally connects the two front foot tubes 11. The bottom end of the front foot tube 11 is detachably connected to the front roller. The top of the front foot tube 11 is bent backward and inclined with a connecting through hole and is hinged and fixed to the top of the rear foot assembly 2; Rear foot assembly 2, the top is inclined upward and is hinged to the top of the front foot assembly 1, and rear rollers are symmetrically arranged at the bottom end; the rear foot assembly 2 includes: two symmetrically arranged rear swingarm tubes 21 and a swingarm connecting tube 22 that connects the two rear swingarm tubes 21. The bottom of the rear side of the rear swingarm tube 21 is fixedly connected to the rear roller. The top of the front side of the rear swingarm tube 21 is hinged to the outside of the top of the front foot tube 11. Swing rod brackets 24 are symmetrically arranged on the two rear swingarm tubes 21, which are adapted to the support swing rod 71. Swing rod brackets 23 are arranged on the rear swingarm tubes 21 on both sides of the swing rod bracket 24; The backrest assembly 3 is connected to the inner side of the rear wheel end of the rear foot assembly 2 through a folding support mechanism 7 at the bottom; the backrest assembly 3 includes: backrest tubes 31 symmetrically connected to the inner side of the rear foot assembly 2, a push handle tube 32 horizontally connecting the tops of the two backrest tubes 31, a backrest connecting tube 34 horizontally connecting the bottoms of the two backrest tubes 31, and a backrest pad 33 arranged between the two backrest tubes 31; The seat surface 4 is rotatably connected to the backrest assembly 3 at the rear side and coaxially hinged to the tops of the front foot assembly 1 and the rear foot assembly 2 at the front side; the seat surface 4 includes: a seat surface bracket 41 and a seat board 43 arranged above the seat surface bracket. Connecting supports 42 are symmetrically arranged on the front side of the seat surface bracket 41. The rear end of the seat surface bracket 41 is symmetrically provided with connecting parts that are rotatably connected to the outer sides of the two backrest tubes 31. The connecting supports 42 are coaxially installed between the front foot tube 11 and the rear parallel fork tube 21; The folding support mechanism 7 is rotatably connected to the rear foot assembly 2 and rotates back and forth around the rear foot assembly 2 to drive the front foot assembly 1, the backrest assembly 3, and the seat surface 4 to unfold and fold; the folding support mechanism 7 includes: a support swing rod 71 connecting the rear foot assembly 2 and the backrest assembly 3, a limit wrench 72 arranged at one end of the support swing rod 71, a limit pin 73 adapted to the limit wrench 72, and a connecting rod 74 connecting and supporting the backrest assembly 3 and the bottom of the front foot assembly 1. The limit pin 73 is arranged on the rear foot assembly 2 outside the swinging end of the support swing rod 71. One end of the support swing rod 71 is rotatably connected to the rear foot assembly 2, and the other end is rotatably connected to the backrest assembly 3 and can be folded and unfolded rotatably back and forth relative to the rear foot assembly 2; making the folding and unfolding operation of this trolley convenient, the support stable, firm and reliable. By connecting the backrest assembly 3, the connecting rod 74, the front foot assembly 1, the rear foot assembly 2 and the seat surface 4 through the support swing rod 71 at the same time, it is ensured that the connection of its various components is reliable and not easy to loosen, and the space is small after folding, which is suitable for handling and storage and is convenient to carry.

[0027] Specifically: The connecting rod 74 is arranged inside the bottom of the front foot tube 11 and above the front foot connecting tube 12; swing rod brackets 23 adapted to the supporting swing rod 71 are symmetrically arranged on the two rear parallel fork tubes 21. Swing rod brackets 24 are arranged on the rear parallel fork tubes 21 on both sides of the swing rod bracket 23. A clamping groove adapted to the supporting swing rod 71 is arranged on the swing rod bracket 24. The limit wrench 72 is coaxially arranged outside the connecting end of the supporting swing rod 71 and the backrest assembly 3 and is adapted to be clamped with a limit pin 73 arranged on one side of the swing rod bracket 24; by arranging swing rod brackets 24 adapted to the supporting swing rod 71 on the rear parallel fork tubes 21 on both sides of the swing rod bracket 23 to limit the supporting swing rod 71 in different position states, it is ensured that the overall structure is stable and not loose during unfolding and folding; the bottom of the backrest tube 31 is rotationally supported by the supporting swing rod 71 and the rear parallel fork tube 21 inside the rear parallel fork tube 21. The inner bottom of the backrest tube 31 is connected to the front foot tube 11 through the connecting rod 74, and the front foot tube 11 and the rear parallel fork tube 21 form a triangular stable support. The connecting rod 74 and the supporting swing rod 71 are arranged on the front and rear and inner and outer opposite sides of the backrest tube 31 to form a stable support for the backrest tube 31; pulling the limit wrench 72 to release the connection between the limit wrench 72 and the limit pin 73 drives the supporting swing rod 71 to rotate 180 degrees around the swing rod bracket 23 and be clamped and limited with the swing rod bracket 24 on the other side. At the same time, it drives the bottom of the backrest assembly 3 connected to the supporting swing rod 71, the connecting rod 74, and the bottom of the front foot assembly 1 connected to the connecting rod 74 to fold towards the bottom of the rear parallel fork tube 21, and drives the hinge joints of the front foot assembly 1, the rear foot assembly 2, and the seat surface 4 to complete folding towards the upper part of the backrest assembly 3; the folding operation is simple and convenient, the folding is compact, the space is small, and it can effectively prevent the problem of easy loosening after folding, which affects handling and storage, so it is convenient to carry out. The limit wrench 72 and the limit pin 73 can be arranged on both sides of the rear parallel fork tube 21, or only on one side of the rear parallel fork tube 21; the limit pin 73 can be arranged on the rear parallel fork tube 21 outside the swing rod bracket 24 at the unfolded state position of the supporting swing rod 71, or symmetrically arranged on the rear parallel fork tubes 21 outside the two swing rod brackets 24.

[0028] An optional implementation: As Figure 1 、 2 shown, a connecting lug 13 is arranged at the middle position of the front foot connecting tube 12. A footrest assembly 8 can also be rotatably arranged on the connecting lug 13, which is composed of a footrest tube frame 81 and a footboard 82 arranged at the bottom of the footrest tube frame 81. A rotating shaft adapted to the connecting lug 13 is arranged above the footrest tube frame 81, and the top of the footrest tube frame 81 rotates and abuts against the inside of the front foot connecting tube 12; the footrest assembly 8 can improve the safety and comfort of the rider.

[0029] An optional implementation: As Figure 4As shown in the figure, the limit wrench 72 includes a connecting portion 721, a grip portion 724, a snap groove 722 provided between the connecting portion 721 and the grip portion 724, and a limit projection 723 extending along one side of the snap groove 722. The snap groove 722 is adapted to the limit pin 73.

[0030] An alternative embodiment: As Figure 1 , 2 , 5, and 6 show, the rear foot assembly 2 further includes a footrest push rod 9 provided at the bottom end of a rear flat fork tube 21. One end of the footrest push rod 9 is vertically arranged with respect to the rear flat fork tube 21, and the other end is bent upward and extends backward parallel to the rear roller beyond the maximum outer diameter of the rear roller; the footrest push rod 9 at the bottom end of the rear flat fork tube 21 can improve the obstacle-crossing performance. When it is necessary to cross an obstacle during pushing, the pusher steps on the end of the footrest push rod 9 to lift the front roller to achieve this; the extended portion of the folded footrest push rod 9 can form a stable triangular support surface with the two rear wheels, and it can stand and be placed without loosening after folding, reducing the storage space.

[0031] An alternative embodiment: As Figure 1-3 shown, it further includes a braking system 6. The braking system 6 includes: a brake operating member 61 provided at the top of the backrest assembly 3, a braking brake 62 provided at the rear side of the rear foot assembly 2 and adapted to abut against the rear roller, a brake wire support member 63, a reset member 64, and a brake wire connecting the brake operating member 61 and the braking brake 62. The braking brake 62 is rotatably connected to the outside of the rear flat fork tube 21, with an outwardly folded brake handle at the top adapted to the rear roller, and a brake wire fixing structure bent inward at the bottom. The brake wire support member 63 is suspended below the rear flat fork tube 21 and inside the braking brake 62 and corresponds to the brake wire fixing structure. The brake wire support member 63 is provided with a wire threading structure, and the reset member 64 is a reset spring provided between the brake wire fixing structure and the brake wire support member 63; to ensure safe driving.

[0032] An alternative embodiment: As Figure 1 , 2 , 5, and 6 show, it further includes armrest assemblies 5 symmetrically provided on both sides of the backrest assembly 3 and capable of flipping up and down relative to the backrest assembly 3; the armrest assemblies 5 that can flip up and down can improve the safety and comfort of the passengers.

[0033] The embodiments disclosed in the present invention are preferred embodiments, but are not limited thereto. Those of ordinary skill in the art can easily understand the spirit of the present invention based on the above embodiments and make different extensions and changes. However, as long as they do not depart from the spirit of the present invention, they are within the protection scope of the present invention.

Claims

1. A portable trolley, characterized in that: including a front foot assembly (1) with front rollers symmetrically arranged at the bottom; a rear foot assembly (2) with the top inclined upwards and hinged to the top of the front foot assembly (1), and rear rollers symmetrically arranged at the bottom end; a backrest assembly (3) with the bottom connected to the inner side of the rear foot assembly (2) near one end of the rear roller through a folding support mechanism (7); a seat surface (4) with the rear side rotatably connected to the backrest assembly (3) and the front side coaxially hinged to the tops of the front foot assembly (1) and the rear foot assembly (2); the folding support mechanism (7) is rotatably connected to the rear foot assembly (2) and rotates back and forth around the rear foot assembly (2) to drive the front foot assembly (1), the backrest assembly (3) and the seat surface (4) to unfold and fold.

2. The portable trolley according to claim 1, wherein: The folding support mechanism (7) includes: a support swing rod (71) connecting the rear foot assembly (2) and the backrest assembly (3), a limit wrench (72) arranged at one end of the support swing rod (71), a limit pin (73) adapted to the limit wrench (72), and a connecting rod (74) connecting the bottom of the backrest assembly (3) and the front foot assembly (1). The limit pin (73) is arranged on the rear foot assembly (2) outside the swinging end of the support swing rod (71). One end of the support swing rod (71) is rotatably connected to the rear foot assembly (2), and the other end is rotatably connected to the backrest assembly (3) and can be rotatably folded and unfolded back and forth relative to the rear foot assembly (2).

3. The portable trolley according to claim 2, wherein: The front foot assembly (1) includes front foot tubes (11) arranged symmetrically and parallelly, and a front foot connecting tube (12) transversely connecting the two front foot tubes (11). The bottom end of the front foot tube (11) is detachably connected to the front roller. The top of the front foot tube (11) is bent and inclined backwards and provided with a connecting through hole for hinged fixation to the top of the rear foot assembly (2). The connecting rod (74) is arranged inside the bottom of the front foot tube (11) and above the front foot connecting tube (12).

4. The portable trolley according to claim 3, wherein: A connecting lug (13) is arranged at the middle position of the front foot connecting tube (12). A footrest assembly (8) is rotatably arranged on the connecting lug (13). The footrest assembly (8) is composed of a footrest tube frame (81) and a footboard (82) arranged at the bottom of the footrest tube frame (81). A rotating shaft adapted to the connecting lug (13) is arranged above the footrest tube frame (81). The top of the footrest tube frame (81) rotatably abuts against the inner side of the front foot connecting tube (12).

5. The portable trolley according to claim 2, wherein: The rear foot assembly (2) includes: two symmetrically arranged rear fork tubes (21) and a fork connection tube (22) connecting the two rear fork tubes (21). The bottom of the rear side of the rear fork tube (21) is fixedly connected to the rear roller. The top of the front side of the rear fork tube (21) is hinged to the outside of the top of the front foot tube (11). Symmetrically arranged on the two rear fork tubes (21) are swing rod brackets (23) adapted to the support swing rod (71). On the rear fork tubes (21) on both sides of the swing rod bracket (23), there are swing rod supports (24). The swing rod support (24) is provided with a card slot adapted to the support swing rod (71). The limit wrench (72) is coaxially arranged on the outside of the connection end of the support swing rod (71) and the backrest assembly (3), and is adapted to be snap-fastened with the limit pin (73) on one side of the swing rod support (24). The limit wrench (72) includes a connection part (721), a grip part (724), a snap slot (722) arranged between the connection part (721) and the grip part (724), and a limit projection (723) extending along one side of the snap slot (722). The snap slot (722) is adapted to be snap-fastened with the limit pin (73).

6. The portable trolley according to claim 5, characterized in that: The rear foot assembly (2) further includes a footrest push rod (9) arranged at the bottom end of one rear fork tube (21). One end of the footrest push rod (9) is arranged perpendicular to the rear fork tube (21), and the other end is bent upward and extends backward parallel to the rear roller beyond the maximum outer diameter of the rear roller.

7. The portable trolley according to claim 2, wherein: The backrest assembly (3) includes: a backrest tube (31) connected to the inside of the rear foot assembly (2), a push handle tube (32) connecting the tops of the two backrest tubes (31), a backrest connection tube (34) connecting the bottoms of the two backrest tubes (31), and a backrest pad (33) arranged between the two backrest tubes (31). The bottom of the backrest tube (31) is rotationally supported and connected to the inside of the rear fork tube (21) through the support swing rod (71). The inside of the bottom of the backrest tube (31) is connected to the front foot tube (11) through a connecting rod (74), and a triangular stable support is formed between the front foot tube (11) and the rear fork tube (21). The connecting rod (74) and the support swing rod (71) are arranged on the front and rear, inner and outer opposite sides of the backrest tube (31) to form a stable support for the backrest tube (31). When folding, the limit wrench (72) is pulled to disengage the snap-fastening of the limit pin (73). After the support swing rod (71) rotates 180 degrees around the swing rod bracket (23), it is adapted to be snap-fastened and limited with the swing rod support (24) on the other side, driving the bottom of the support swing rod (71), the backrest assembly (3), the connecting rod (74), and the bottom of the front foot assembly (1) connected to the connecting rod (74) to fold towards the bottom of the rear fork tube (21), and at the same time driving the hinge joints of the front foot assembly (1), the rear foot assembly (2), and the seat surface (4) to fold towards the upper part of the backrest assembly (3).

8. The portable trolley according to claim 1, characterized in that: The seat surface (4) includes: a seat surface bracket (41) and a seat board (43) disposed above the seat surface bracket. Connection supports (42) are symmetrically provided on the front side of the seat surface bracket (41). At the rear end of the seat surface bracket (41), connection parts are symmetrically provided and are rotatably connected to the outer sides of the two backrest tubes (31). The connection supports (42) are coaxially installed between the front foot tube (11) and the rear flat fork tube (21).

9. The portable trolley according to any one of claims 1-8, characterized in that: It further includes a braking system (6). The braking system (6) includes: a braking operation member (61) disposed at the top of the backrest assembly (3), a braking brake (62) disposed at the rear side of the rear foot assembly (2) and adapted to abut against the rear roller, a brake wire support member (63), a reset member (64), and a brake wire connecting the braking operation member (61) and the braking brake (62). The braking brake (62) is rotatably connected to the outer side of the rear flat fork tube (21), an outer-folded brake handle is provided at the top and is adapted to the rear roller, and a brake wire fixing structure is bent inward at the bottom. The brake wire support member (63) is suspended below the rear flat fork tube (21) and inside the braking brake (62) and corresponds to the brake wire fixing structure. The brake wire support member (63) is provided with a wire threading structure. The reset member (64) is a reset spring disposed between the brake wire fixing structure and the brake wire support member (63).

10. The portable trolley according to claim 9, characterized in that: It further includes armrest assemblies (5) symmetrically disposed on both sides of the backrest assembly (3) and capable of flipping up and down relative to the backrest assembly (3).

Images