CN219728297U - Barrows - Google Patents

Abstract

The utility model discloses a trolley, which comprises a trolley frame with an unfolding state and a folding state, wherein the trolley frame comprises a first bracket and a second bracket, the first bracket comprises a first rod and a cross rod, and the second bracket comprises a second rod; one end of the first rod is rotatably connected with one end of the second rod, a locking assembly for locking the first rod and the second rod with each other is arranged between the first rod and the second rod, and the locking assembly at least comprises a locking block; the frame is also provided with an unlocking mechanism for unlocking the two groups of locking assemblies, the unlocking mechanism comprises two pushing pieces, and each pushing piece is provided with a driving end part for pushing the locking piece; in the process of the opposite movement of the pushing pieces, the two driving end parts drive the locking blocks on the corresponding sides to move. After the locking component is unlocked, the cart can be folded by only lifting the cross rod.

Description

Barrows

Technical Field

The utility model relates to a cart.

Background

Most carts all have folding function, and the shallow volume after folding reduces, and convenient to use person accomodates and carries, but among the prior art, folding shallow structure is different, and folding principle is also different, and wherein most carts structure is complicated, folding operation is loaded down with trivial details, often needs the user to operate with both hands, causes inconvenience to the user, greatly reduced user experience.

Disclosure of Invention

It is an object of the present utility model to provide an improved cart.

In order to achieve the above purpose, the utility model adopts the following technical scheme: the cart comprises a cart frame with an unfolding state and a folding state, wherein the cart frame at least comprises a first bracket and a second bracket, the first bracket comprises two groups of first rods which are respectively arranged at the left side and the right side, a cross rod which is fixedly arranged between the two groups of first rods and extends along the left direction and the right direction, the second bracket comprises two groups of second rods which are respectively arranged at the left side and the right side,

the left side and the right side of the frame are respectively provided with a locking assembly used for locking the first rod and the second rod with each other, the locking assembly at least comprises a locking block, the locking block is provided with a first position and a second position, the locking block is positioned at the first position, and the locking assembly is positioned at a locking state; the locking assembly is in an unlocking state, the locking assembly is switched between the first position and the second position in the process of sliding the locking block in the left-right direction, and the locking assembly further comprises a first elastic piece which is used for driving the locking block to slide from the second position towards the first position and requires acting force;

the vehicle frame is also provided with an unlocking mechanism for unlocking the two groups of locking assemblies, the unlocking mechanism comprises two pushing pieces which are respectively arranged on the cross rod in a sliding manner along the left-right direction, and each pushing piece is provided with a driving end part for pushing the locking piece; the unlocking mechanism further comprises an unlocking operation piece movably arranged on the cross rod and a linkage assembly arranged between the unlocking operation piece and the pushing piece and used for linkage to enable the two pushing pieces to move oppositely or move oppositely, wherein in the process that the two pushing pieces move oppositely, the two driving end parts drive the locking pieces on the corresponding sides to move from the first position to the second position.

Preferably, the pushing member is in a rod shape, the length extending direction of the pushing member, the length extending direction of the transverse rod and the sliding direction of the locking piece extend parallel or collinear with each other, the pushing member further comprises a connecting end portion, the connecting end portion and the driving end portion are arranged at two different ends of the pushing member in the length direction, and the linkage assembly is arranged between the unlocking operation member and the two connecting end portions.

In some embodiments, the unlocking operation member is slidably disposed in the middle of the cross bar, and the sliding direction of the unlocking operation member is perpendicular to the sliding directions of the two pushing members.

In some embodiments, the linkage assembly includes two connecting rods, each of the connecting rods has a first end portion and a second end portion respectively disposed at two different ends in a length direction of the connecting rod, the two first end portions are rotatably connected with the connecting end portion on the side where the connecting end portion is disposed, the two second end portions are rotatably connected, and the two second end portions can be disposed in a manner of moving relative to the cross bar along with sliding of the unlocking operation member.

In some embodiments, the two connecting rods are provided with an included angle between their length extending directions, the unlocking operation member is moved towards the cross rod, the angle value of the included angle is gradually increased, the two pushing members are moved back to back, the locking block is moved from the first position to the second position, the locking assembly is switched from the locking state to the unlocking state, the linkage assembly further comprises a second elastic member for providing acting force required by the opposite movement of the pushing members at both sides, and the included angle is gradually reduced in the opposite movement process of the pushing members at both sides.

Preferably, at least one of the two second end portions is rotatably connected with the unlocking operation member, or a clamping groove is formed in the unlocking operation member, and at least one second end portion is embedded in the clamping groove in a relatively rotatable manner.

Preferably, the horizontal pole has the cavity of hollow pole that runs through along the axial, the spout has been seted up at the middle part of horizontal pole, the ejector pin is located in the cavity of hollow pole, the unblock operating means includes fixing base and sliding fit ground setting are in drive slider on the fixing base, the fixing base set firmly in on the horizontal pole, its part is located in the spout and another part is located all the time the outside of horizontal pole.

In some embodiments, the locking assembly is in a locked state, the drive end being spaced from the locking block on the side; during the process of switching the locking assembly from the locking state to the unlocking state, the driving end part is abutted against one side end surface of the locking block on the side.

Preferably, the frame comprises a front bracket, a rear bracket and a side rod frame, the frame is in an unfolding state, the front bracket and the side rod frame respectively extend obliquely backwards from bottom to top, the rear bracket extends obliquely forwards from bottom to top, the upper part of the front bracket is rotationally connected with the lower part of the side rod frame, the upper part of the rear bracket is rotationally connected with the side rod frame, the frame is in a folding state, the front bracket, the rear bracket and the side rod frame are mutually folded along the front and rear directions, one of the front bracket and the side rod frame forms the first bracket, and the other forms the second bracket.

In some embodiments, the frame further comprises a bottom bracket rotatably connected between a lower portion of the front bracket and a lower portion of the rear bracket, the front bracket constituting the first bracket, the side bar bracket constituting the second bracket; and when the locking assembly is in an unlocking state, the frame is converted from an unfolding state to a folding state in the process of upward movement of the cross rod.

Due to the application of the technical scheme, compared with the prior art, the utility model has the following advantages: in the cart, the locking assemblies at the two sides of the first bracket and the second bracket can be simultaneously unlocked by driving the unlocking operation piece arranged on the cross bar, so that the unlocking operation is simple.

Further, in the cart of some embodiments, the unlocking operation piece can be driven to move simultaneously in the process of lifting the cross rod, so that the first support and the second support rotate relatively after unlocking, the cart can be folded once being lifted, the folding operation of the cart is simplified, and convenience is brought to daily use of users.

Drawings

FIG. 1 is a schematic perspective view of a cart in an unfolded state according to an embodiment of the present utility model;

FIG. 2 is an enlarged schematic view of FIG. 1 at A;

FIG. 3 is a schematic perspective view of the cart of FIG. 1 in a collapsed, rotated configuration;

FIG. 4 is a side view schematic illustration of the cart of FIG. 1;

FIG. 5 is a schematic cross-sectional view taken along B-B in FIG. 4;

FIG. 6 is an enlarged schematic view of FIG. 5 at C;

FIG. 7 is a schematic top view of the cart of FIG. 1;

FIG. 8 is a schematic cross-sectional view taken along D-D in FIG. 7;

FIG. 9 is an enlarged schematic view of FIG. 8 at E;

FIG. 10 is an enlarged schematic view of FIG. 8 at F;

FIG. 11 is a schematic diagram of the structure and positional relationship of the locking assembly and the unlocking mechanism;

wherein: 100. a frame; 200. a front wheel assembly; 201. a front wheel frame; 202. a front wheel body; 300. a rear wheel assembly;

1. a front bracket; 11. a front strut; 12. a cross bar; 2. a side rod frame; 21. a side bar; 3. a locking assembly; 31. a locking piece; 311. locking teeth; 32. a first elastic member; 4. an unlocking mechanism; 41. a pushing member; 411. a drive end; 412. a connecting end; 42. unlocking the operating member; 421. driving a sliding block; 422. a fixing seat; 43. a linkage assembly; 431. a connecting rod; 431a, a first end; 431b, a second end; 432. a second elastic member; 5. a rear bracket; 51. a rear strut; 6. a bottom bracket; 7. a handle pushing frame;

x1, a first rotation center line; x2, a second rotation center line.

Detailed Description

The following description of the orientations of the upper, lower, left, right, front, rear, inner, outer, etc. are defined with reference to the orientations observed by a pusher pushing the cart in the unfolded state, and are only used to clearly illustrate the relative positional relationship of the various rods and components on the cart.

The technical scheme of the utility model is further described below with reference to the attached drawings and specific embodiments.

Referring to fig. 1 to 11, a cart includes a frame 100 having an unfolded state and a folded state, the frame 100 includes a first bracket including two sets of first bars disposed at left and right sides, a cross bar 12 fixedly disposed between the two sets of first bars and extending in a left and right direction, and a second bracket including two sets of second bars disposed at left and right sides.

On each of the left and right sides of the frame 100, one end of the first rod is rotatably connected with one end of the second rod, and a locking assembly 3 for locking the first rod and the second rod to each other is arranged between the first rod and the second rod, the locking assembly 3 comprises a locking piece 31, the locking piece 31 has a first position and a second position, the locking piece 31 is in the first position, and the locking assembly 3 is in a locking state; the locking piece 31 is in the second position, the locking assembly 3 is in an unlocking state, the locking piece 31 is switched between the first position and the second position in the process of sliding along the left-right direction, and the locking assembly 3 further comprises a first elastic piece 32 for driving the locking piece 31 to slide from the second position towards the first position.

The frame 100 is further provided with an unlocking mechanism 4 for unlocking the two sets of locking assemblies 3, the unlocking mechanism 4 comprises two pushing members 41 which are respectively arranged on the cross rod 12 in a sliding manner along the left-right direction, and each pushing member 41 is provided with a driving end 411 for pushing the locking piece 31. The unlocking mechanism 4 further comprises an unlocking operation member 42 movably arranged on the cross bar, and a linkage assembly 43 arranged between the unlocking operation member 42 and the pushing members 41 and used for linkage to enable the two pushing members 41 to move oppositely or move oppositely, wherein in the process of moving the two pushing members 41 oppositely, the two driving end parts 411 drive the locking blocks 31 on the corresponding sides to move from the first position to the second position. When the frame 100 is switched from the unfolded state to the folded state, the user can easily unlock the locking between the first rod and the second rod at the left and right sides only by unlocking the operation member 42, so that the next folding operation is performed, and the folding process is simplified.

Referring to fig. 1 to 8, in the cart of the present embodiment, a frame 100 includes a front frame 1, a side frame 2 and a rear frame 3, and in a unfolded state of the frame 100, the front frame 1 and the side frame 2 are respectively inclined forward from top to bottom, and a rear frame 5 is inclined forward from bottom to top, an upper portion of the front frame 1 is rotatably connected to a lower portion of the side frame 2, and an upper portion of the rear frame 5 is rotatably connected to the side frame 2. The frame 100 further includes a bottom bracket 6 rotatably coupled between the lower portion of the front frame 1 and the lower portion of the rear frame 5, and a handle bar frame 7 coupled to the upper portion of the side bar frame 2, the bottom bracket 6 extending in the front-rear direction in a deployed state, a front end portion thereof rotatably coupled to the middle portion of the front frame 1, and a rear end portion thereof rotatably coupled to the lower end portion of the rear frame 5; the handle holder 7 is integrally provided with a U-shaped bar having a downward opening, and the lower end portion thereof is rotatably connected to the upper end portion of the side bar holder 2 about a second rotation center line X2 extending in the left-right direction. The cart is provided with a front wheel assembly 200 and a rear wheel assembly 300, the front wheel assembly 200 is provided with a group, the group comprises a front wheel frame 201 and a front wheel frame 202, the front wheel frame 201 is rotationally connected to the bottom of the front bracket 1, and the front wheel frame 202 is rotationally connected to the front wheel frame 201 through a front wheel shaft; the rear wheel assembly 300 is located at the bottom of the rear bracket 5.

A first bracket formed by one of the front bracket 1 and the side bar frame 2, and a second bracket formed by the other.

In the present embodiment, the front frame 1 constitutes a first frame, the side bar frame 2 constitutes a second frame, and specifically, the front frame 1 includes two front struts 11 located on both left and right sides, each front strut 11 extending in the up-down direction, respectively; the side bar frame 2 includes two side bars 21 located on the left and right sides, the two side bars 21 extending in the up-down direction. The upper end of the front strut 11 is rotatably connected with the lower end of the side rod 21 around a first rotation center line X1, and the first rotation center line X1 horizontally extends along the left-right direction; the front strut 11 and the side rod 21 respectively form the first rod and the second rod; the cross bar 12 is disposed between the upper ends of the two front struts 11, a set of locking assemblies 3 are disposed at the rotational connection positions of the front struts 11 and the side bars 21 on the left and right sides, and the unlocking mechanism 4 is disposed on the cross bar 12.

The rear bracket 5 includes two rear struts 51 located on the left and right sides, and is located on each of the left and right sides of the frame 100, and the upper end portions of the rear struts 51 are rotatably connected to the lower portions of the side bars 21, and in the unfolded state, the connection portions of the rear struts 51 and the side bars 21 are located above the connection portions of the front struts 11 and the side bars 21. The rear wheel assembly 300 includes two sets on the left and right sides, and the two sets of rear wheel assemblies 300 are respectively located at bottoms of the two rear struts 51.

In this embodiment, the upper end of the front strut 11 is provided with a first spline (not shown in the figure), the lower end of the side rod 21 is provided with a second spline (not shown in the figure), and the first spline and the second spline are each provided with a plurality of splines arranged at intervals along the axial direction. Referring to fig. 6, 9 and 11, the locking block 31 is a locking tooth member, and a plurality of locking teeth 311 are arranged on the outer circumference of the locking tooth member at intervals; when the locking assembly 3 is in the locked state, one part of the locking teeth 311 is inserted into the first tooth groove while the other part is inserted into the second tooth groove, and the locking teeth part is at the first position; in the unlocked state of the locking assembly 3, the locking teeth 311 are withdrawn from the first tooth slots and all inserted into the second tooth slots, and the locking tooth members are shifted to the second position. That is, the switching between the first position and the second position is achieved when the lock gear slides along the first rotation center line X1. The first resilient member 32 is embodied as a spring which abuts against the locking tooth member and provides the force required for the locking tooth member to move towards the first position.

In this embodiment, the cross bar 12 has a hollow bar cavity 121 penetrating in the axial direction, the pushing member 41 is rod-shaped and disposed in the hollow bar cavity 121, and the length extending direction of the pushing member 41, the length extending direction of the cross bar 12, and the sliding direction of the locking piece 31 extend parallel or collinear with each other. Specifically, the pushing members 41 include two groups located at the left and right sides, the two groups of pushing members 41 extend horizontally from the middle of the cross bar 12 to the left and right sides respectively, the two groups of pushing members 41 extend to the connection positions of the first bars 11 and the second bars 21 at the two sides respectively along the length direction of the cross bar 12, the end parts of the two groups of pushing members 41 located at the left and right sides of the cross bar 12 are respective driving end parts 411, the two groups of pushing members 41 in the hollow bar cavity 121 can slide along the length direction of the front cross bar 12, and simultaneously the two groups of pushing members 41 can drive the locking pieces 31 at the corresponding sides to slide along the left and right directions through the driving end parts 411.

The pushing member 41 further includes a connection end portion 412, where the connection end portion 412 and the driving end portion 411 are partially disposed at two different ends of the pushing member 41 in the length direction, and in this embodiment, the end portions of the two groups of pushing members 41 located in the middle of the cross bar 12 are the respective connection end portions 412. The linkage assembly 43 is disposed between the unlock operating member 42 and the two link ends 412.

In this embodiment, the unlocking operation member 42 is slidably disposed in the middle of the cross bar 12, and the sliding direction of the unlocking operation member 42 is perpendicular to the sliding direction of the two pushing members 41. Specifically, a chute 122 is formed in the middle of the cross bar 12, and the extending direction of the chute 122 is perpendicular to the length extending direction of the cross bar 12; the unlocking operation member 42 includes a fixed seat 422 and a driving slide 421 slidably disposed on the fixed seat 422, the fixed seat 422 is fixedly disposed on the cross bar 12, a portion of the fixed seat 422 is clamped in the sliding slot 122, and another portion of the fixed seat 422 is always located outside the cross bar 12, and at least a portion of the driving slide 421 is located in the sliding slot 122, and can slide along the sliding slot 122 into the hollow bar cavity 121 along the sliding slot 122 simultaneously with respect to the fixed seat 422.

A two-way lock structure is further provided between the driving slide 421 and the cross bar 12 in the present embodiment for preventing the sudden unlocking of the vehicle frame 100 caused by the false touch, and the two-way lock structure may be specifically a locking structure for locking the driving slide 421 on the fixing seat 422, and the detailed structure of the two-way lock structure is not the focus of the present utility model, and it may specifically be a locking structure in the prior art. The user needs to unlock the two-way lock structure before being able to press the driving slider 421 to slide into the hollow rod cavity 121.

The link assembly 43 includes two link rods 431, each of the link rods 431 has a first end portion 431a and a second end portion 431b respectively provided at different ends in the longitudinal direction thereof, the two first end portions 431a are respectively rotatably connected to the connecting end portion 412 on the side where they are located, the two second end portions 431b are rotatably connected, and the two second end portions 431b are movably provided with respect to the cross bar 12 in response to the sliding of the unlocking operation member 42. Specifically, at least one of the two second ends 431b may be rotatably connected to the unlocking operation member 42, or a clamping groove may be provided on the unlocking operation member 42, and at least one second end 431b may be relatively rotatably embedded in the clamping groove. In the present embodiment, the two second end portions 431b are rotatably connected about the same rotation axis, and at the same time, the two second end portions 431b are rotatably connected to the driving slider 421 about the same rotation axis, and the extending direction of the rotation axis is perpendicular to the length extending direction of the cross bar 12.

Referring to fig. 9 and 10, in the present embodiment, an included angle is formed between the length extension directions of the two connection rods 431. The linkage assembly 43 further includes a second elastic member 432, where the second elastic member 432 provides a force required for the pushing members 41 on both sides to move toward each other, and in this embodiment, the second elastic member 432 is a spring having two sets on the left and right sides, and located on each of the left and right sides of the frame 100, one end of the spring abuts against the driving end 411 of the pushing member 41, and the other end of the spring abuts against the end of the side bar 21 connected to the front strut 11.

When the frame 100 is in a unfolded state, as shown in fig. 1 and 4, the front bracket 1 and the side bracket 2 extend along the same length direction, at this time, the locking assembly 3 is in a locking state, and the locking teeth 311 of the locking tooth piece are simultaneously clamped in the first tooth socket of the front supporting rod 11 and the second tooth socket of the side rod 21, so that the front supporting rod 11 and the side rod 21 are mutually locked and can not rotate relatively; in this state, the front bracket 1, the side brackets 2, the rear bracket 5 and the bottom bracket 6 locked together form a triangle structure, so that the frame 100 in the unfolded state has good stability, and a user can push the cart forward.

The locking of the two-way lock structure is released, then the unlocking operation piece 42 is pressed downwards to move towards the cross rod 12, in the process, the driving sliding block 42 positioned on the fixed seat 422 pushes the two connecting rods 431 to move towards the hollow rod cavity 121, the angle value of the included angle of the two connecting rods 431 is gradually increased, the second end parts 431b of the two connecting rods push the two pushing pieces 41 to move oppositely, the driving end parts 411 of the two pushing pieces 41 respectively move towards the locking piece 31 on the same side and gradually abut against one end surface of the locking piece 31, and then the locking piece 31 on the same side is pushed to move from the first position to the second position, and the locking assembly 3 is switched from the locking state to the unlocking state. In the unlocked state, the driving end 411 abuts against one end face of the lock piece 31 on the left and right sides of the frame 100, the lock piece 31 is completely separated from the first tooth space, the restriction between the front strut 11 and the side bar 21 is released, and the two can relatively rotate around the first rotation center line X1 and fold in opposite directions.

The frame is converted from the unfolded state to the folded state during the upward movement of the cross bar 12 when the locking assembly 3 is in the unlocked state. Specifically, the push handle frame 7 is turned forwards around the second rotation center line X2 to fold the push handle frame 7 above the side rod frame 2, the unlocking operation member 42 is pressed downwards to unlock the front support 1 and the side rod frame 2, and then the cross rod 12 is lifted upwards, in the process, under the action of gravity, the front support 1 swings backwards around the first rotation center line X1, the side rod frame 2 rotates forwards around the first rotation center line X1, the side rod frame 2 drives the rear support 5 to fold forwards relative to the front support 1, the bottom support 6 is turned backwards under the driving of the front support 1 and the rear support 5, the push handle is folded once, and the folding operation is quite convenient.

When the unlocking operation member 42 is released, the second elastic members 432 on both sides drive the two pushing members 41 to move to the locked position, the connecting end portions 412 of the pushing members 41 push the first end portions 431a of the connecting rods 431 to move toward each other, the angle value of the included angle between the two connecting rods 431 is gradually reduced, and the second end portions 431b of the connecting rods 431 drive the driving slide block 42 to move away from the cross rod 12 and finally to the initial position in the locked state.

In the folded state, as shown in fig. 3, the front frame 1, the rear frame 5 and the side frames 2 are folded in the front-rear direction, the bottom frame 6 is folded between the front frame 1 and the rear frame 5, and the front wheel assembly 200 is folded between the two sets of rear struts 51, so that the user can lift the cross bar 12 to carry the cart with one hand.

When the frame 100 is opened, the front bracket 1 and the side bracket 2 are driven to rotate and spread relatively, when the front bracket 1 and the side bracket extend along the same length direction, the first elastic piece 32 drives the locking piece 31 to move from the second tooth groove to the first tooth groove, and finally part of the locking piece 31 moves to the first tooth groove, the locking piece 31 moves from the second position to the first position, and the front bracket 1 and the side bracket 2 are mutually locked.

In summary, the cart in this embodiment is simple to unlock, and when the cart frame 100 is folded, the user only needs to push and lift the cart upwards, and the whole cart can be folded by one hand, so that the folding operation is simple, and the use experience of the user is improved.

In the cart of other embodiments, the two members rotatably connected in the frame 100 may respectively form the first bracket and the second bracket, and the locking assembly 3 and the unlocking mechanism 4 similar to those in the present embodiment are adopted between the two members, so that the locking between the two members can be easily released by unlocking the operating member 42, thereby simplifying the folding operation of the frame 100.

The above embodiments are provided to illustrate the technical concept and features of the present utility model and are intended to enable those skilled in the art to understand the content of the present utility model and implement the same, and are not intended to limit the scope of the present utility model. All equivalent changes or modifications made in accordance with the spirit of the present utility model should be construed to be included in the scope of the present utility model.

Claims (10)

1. A cart comprising a frame having an expanded state and a collapsed state, characterized in that: the frame at least comprises a first bracket and a second bracket, the first bracket comprises two groups of first rods which are arranged on the left side and the right side respectively, a cross rod which is fixedly arranged between the two groups of first rods and extends along the left direction and the right direction, the second bracket comprises two groups of second rods which are arranged on the left side and the right side respectively,

the left side and the right side of the frame are respectively provided with a locking assembly used for locking the first rod and the second rod with each other, the locking assembly at least comprises a locking block, the locking block is provided with a first position and a second position, the locking block is positioned at the first position, and the locking assembly is positioned at a locking state; the locking assembly is in an unlocking state, the locking assembly is switched between the first position and the second position in the process of sliding the locking block in the left-right direction, and the locking assembly further comprises a first elastic piece which is used for driving the locking block to slide from the second position towards the first position and requires acting force;

the frame is also provided with an unlocking mechanism for unlocking the two groups of locking assemblies, the unlocking mechanism comprises two pushing pieces which are respectively arranged on the cross rod in a sliding way along the left-right direction, each pushing piece is provided with a driving end part for pushing the locking piece,

the unlocking mechanism further comprises an unlocking operation piece movably arranged on the cross rod and a linkage assembly arranged between the unlocking operation piece and the pushing piece and used for linkage to enable the two pushing pieces to move oppositely or move oppositely, wherein in the process that the two pushing pieces move oppositely, the two driving end parts drive the locking pieces on the corresponding sides to move from the first position to the second position.

2. The cart of claim 1, wherein: the pushing piece is in a rod shape, the length extending direction of the pushing piece, the length extending direction of the transverse rod and the sliding direction of the locking piece extend mutually parallel or collinearly, the pushing piece further comprises a connecting end part, the connecting end part and the driving end part are arranged at the two different ends of the pushing piece in the length direction, and the linkage assembly is arranged between the unlocking operation piece and the two connecting end parts.

3. The cart of claim 2, wherein: the unlocking operation piece is arranged in the middle of the cross rod in a sliding fit manner, and the sliding direction of the unlocking operation piece is perpendicular to the sliding direction of the pushing pieces.

4. A cart according to claim 3, wherein: the linkage assembly comprises two connecting rods, each connecting rod is provided with a first end part and a second end part which are respectively arranged at two different ends in the length direction of the connecting rod, the two first end parts are rotationally connected with the connecting end parts on the side where the first end parts are arranged, the two second end parts are rotationally connected, and the two second end parts can be arranged along with the sliding of the unlocking operation piece in a relative movement mode.

5. The cart of claim 4, wherein: the length extending direction of the connecting rods is provided with an included angle, the unlocking operation piece faces the cross rod in the moving process, the angle value of the included angle is gradually increased, the pushing pieces move back to back, the locking piece moves from the first position to the second position, the locking assembly is converted from the locking state to the unlocking state, the linkage assembly further comprises a second elastic piece which provides acting force required by the opposite movement of the pushing pieces at two sides, and the included angle is gradually reduced in the opposite movement process of the pushing pieces at two sides.

6. The cart of claim 4, wherein: at least one of the two second end parts is rotatably connected with the unlocking operation piece, or a clamping groove is formed in the unlocking operation piece, and at least one second end part can be embedded in the clamping groove in a relatively rotatable mode.

7. A cart according to claim 3, wherein: the horizontal pole has the cavity pole chamber of following the axial and run through, the spout has been seted up at the middle part of horizontal pole, the pushing away the piece and locating in the cavity pole chamber, the unblock operating means includes fixing base and sliding fit ground setting are in drive slider on the fixing base, the fixing base set firmly in on the horizontal pole, its part is located in the spout and another part is located all the time the outside of horizontal pole.

8. The cart of claim 1, wherein: the locking assembly is in a locking state, and the driving end part and the locking block on the side where the driving end part is positioned are provided with a space; in the process of switching the locking assembly from the locking state to the unlocking state, the driving end part is abutted against one side end surface of the locking block on the side where the driving end part is located.

9. The cart of any one of claims 1 to 8, wherein: the frame comprises a front support, a rear support and side rod frames, wherein the frame is in an unfolding state, the front support and the side rod frames respectively incline upwards and backwards from bottom to top, the rear support incline forwards from bottom to top, the upper part of the front support is rotationally connected with the lower part of the side rod frames, the upper part of the rear support is rotationally connected with the side rod frames, the frame is in a folding state, the front support, the rear support and the side rod frames are mutually folded along the front and back directions, one of the front support and the side rod frames forms the first support, and the other forms the second support.

10. The cart of claim 9, wherein: the frame also comprises a bottom bracket frame which is rotationally connected between the lower part of the front bracket and the lower part of the rear bracket, the front bracket forms the first bracket, and the side rod frame forms the second bracket; and when the locking assembly is in an unlocking state, the frame is converted from an unfolding state to a folding state in the process of upward movement of the cross rod.