CN220924244U - Barrows - Google Patents

Abstract

The utility model discloses a trolley, which comprises a trolley frame with an unfolding state and a folding state, and a locking mechanism for locking the trolley frame in the unfolding state, wherein the trolley frame comprises a foldable bottom bracket assembly and a push rod frame which can be folded relative to the bottom bracket assembly, the bottom bracket assembly comprises a first bracket, a second bracket and a third bracket, the first bracket, the second bracket and the third bracket are connected in a rotating way around a first rotation center line, the locking mechanism comprises a first locking assembly arranged among the first bracket, the second bracket and the third bracket, the bottom bracket assembly further comprises a first unlocking assembly for unlocking the first locking assembly, the first unlocking assembly at least comprises a first operating piece, the first operating piece is connected to the first bracket in a rotating way around a second rotation center line, and the first rotation center line and the second rotation center line are parallel. The folding process of the trolley is coherent, and the folding operation is simple.

Description

Barrows

Technical Field

The utility model relates to a cart.

Background

Most carts on the market all have folding function, and the shallow volume after folding reduces, and convenient to use person daily accomodates the arrangement, but current shallow folding step is many, the operation is complicated, often needs the user to operate with both hands, causes inconveniently to the user, greatly reduced user experience.

Disclosure of Invention

The object of the present utility model is to provide a new trolley.

In order to achieve the above purpose, the utility model adopts the following technical scheme: a cart comprising a frame having an expanded state and a collapsed state, a locking mechanism for locking the frame in the expanded state, the frame comprising a foldable bottom bracket assembly and a pusher carriage foldable relative to the bottom bracket assembly, wherein the bottom bracket assembly comprises a first bracket, a second bracket and a third bracket,

The first bracket, the second bracket and the third bracket are connected together in a rotating way around a first rotating central line, the locking mechanism comprises a first locking component which is arranged among the first bracket, the second bracket and the third bracket,

The bottom bracket assembly further comprises a first unlocking assembly for unlocking the first locking assembly, the first unlocking assembly at least comprises a first operating piece, the first operating piece is rotationally connected to the first bracket around a second rotation center line, and the first rotation center line and the second rotation center line are parallel to each other.

Preferably, the first unlocking component further comprises a first unlocking piece, the first unlocking piece is slidably arranged on the first bracket along a direction perpendicular to the first rotation center line, the first unlocking piece has a first position and a second position, the first unlocking piece is positioned at the first position, and the first locking component is in a locking state; the first unlocking piece is positioned at the second position, the first locking assembly is in an unlocking state, the first unlocking assembly further comprises a first elastic piece used for providing acting force required by the movement of the first unlocking piece towards the first position, a driving structure is arranged between the first operating piece and the first unlocking piece, and the driving structure is configured to drive the first unlocking piece to slide between the first position and the second position in the process of rotating the first operating piece around the second rotation center line.

Further, the first bracket, the second bracket and the third bracket are sequentially arranged along the extending direction of the first rotation center line, the first locking component comprises a first locking piece arranged between the first bracket and the second bracket and used for locking the first bracket and the second bracket with each other, and a second locking piece arranged between the second bracket and the third bracket and used for locking the second bracket and the third bracket with each other,

The first locking piece and the second locking piece are both arranged in a sliding way along the extending direction of the first rotation center line, the first locking piece and the second locking piece are mutually abutted along the axial direction, the first unlocking piece is arranged between the first locking piece and the first bracket,

A first unlocking structure is arranged between the first locking piece and the first unlocking piece, the first unlocking structure is configured to drive the first locking piece and the second locking piece to move away from the first bracket in the process that the first unlocking piece moves from the first position to the second position, and the first locking assembly further comprises a second elastic piece used for providing acting force required by the movement of the second locking piece towards the first bracket.

Further, the first unlocking structure comprises a first unlocking surface arranged on the first unlocking piece and a first matching surface arranged on the first locking piece, and the first unlocking surface is an inclined surface which gradually extends from the first position to the second position and gradually away from the first locking piece.

Preferably, the driving structure comprises a driving part arranged on the first operating member and a matching part arranged on the first unlocking member and used for being matched with the driving part, the driving part comprises a driving surface, the driving surface is a cam surface, the matching part is provided with a matching surface which is matched and abutted with the cam surface, and the matching surface always abuts against the cam surface.

Further, the first bracket is provided with a sliding cavity for providing sliding of the first unlocking piece, and the matching part extends out of the sliding cavity and is matched with the driving part.

Preferably, the first support comprises two first struts, the second support comprises two second struts, the third support comprises two third struts, the two second struts are located between the two first struts along the left-right direction, the two third struts are located between the two second struts along the left-right direction, a group of first locking components and a group of first unlocking components are arranged between each group of first struts, each group of second struts and each group of third struts, and the first operating parts in the two groups of first unlocking components are fixedly connected or integrally arranged.

Further, the push rod frame is rotationally connected with the bottom bracket component around the first rotation center line, wherein the push rod frame is positioned between the two third support rods along the left-right direction, the locking mechanism further comprises a second locking component used for mutually locking the third support rods with the push rod frame, the push rod frame can be arranged in a folding way along the length direction, and a second unlocking component which can be used for enabling the second locking component to unlock in a linkage way in the folding way along the length direction of the push rod frame is arranged between the push rod frame and the second locking component.

Further, the push rod frame includes the lower push rod that slides along length direction and stretches out and draws back and upper push rod, the lower part of upper push rod inserts with sliding fit and establishes in the pole chamber of lower push rod, second unblock subassembly includes along the length extension direction of lower push rod is slided and is located second unblock piece on the lower push rod, upper push rod is relative the in-process linkage that the lower push rod slides and draws in makes second unblock piece is followed the length direction of lower push rod slides downwards, the lower part of lower push rod just with all be equipped with a set of second lock subassembly between the third branch of both sides, second lock subassembly is at least including following first rotation central line is slided and is set up third lock piece between third branch with lower push rod, second unblock piece with be provided with between the third lock piece be used for the second unblock structure that the in-process that second unblock piece slides downwards is followed the third lock piece is driven.

Preferably, the frame is in a unfolded state, the first bracket extends obliquely backwards from bottom to top, the third bracket extends obliquely forwards from bottom to top, the second bracket extends along the up-down direction and is positioned above the first bracket and the third bracket, the upper part of the first bracket, the lower part of the second bracket and the upper part of the third bracket are connected in a rotating way around the first rotation center line together, and the first operation piece is arranged on the upper part of the first bracket.

Further, the second bracket includes a supporting seat extending along a front-rear direction, and a bracket portion located below the supporting seat, the bracket portion is rotatably connected with the first bracket and the third bracket, and the cart further includes a seat pocket device movably disposed on the supporting seat, and the seat pocket device has at least a forward use position for leaning against the push rod frame, and a reverse use position facing the push rod frame.

Further, the seat pocket device at least comprises a seat, the seat is rotatably connected to the supporting seat around a rotation center line extending in the vertical direction, and a reversing locking device for locking the seat and the supporting seat relative to each other is further arranged between the seat and the supporting seat.

Due to the application of the technical scheme, compared with the prior art, the utility model has the following advantages: the cart is provided with the first locking component for locking the bottom bracket component, and the first unlocking component for unlocking the bottom bracket component comprises the first operating piece, and the first operating piece is rotationally connected to the first bracket, so that a user can unlock the bottom bracket component only by rotating the first operating piece, and further, the folding operation of the frame is simplified.

Drawings

FIG. 1 is a schematic perspective view of a cart in an unfolded state, wherein a seat pocket device is in a forward use position;

FIG. 2 is an exploded view of a portion of the structure of FIG. 1;

FIG. 3 is a schematic side view of FIG. 1;

FIG. 4 is a schematic cross-sectional view taken along M-M in FIG. 3;

FIG. 5 is an enlarged schematic view of FIG. 4 at A;

FIG. 6 is a schematic side view of the cart in a reverse use position of the seat pocket apparatus of the present embodiment;

FIG. 7 is a schematic side view of a first step of a folding operation of the cart of this embodiment;

FIG. 8 is a schematic view in section along the N-N direction in FIG. 7;

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

FIG. 10 is a schematic side view of a first step of a folding operation of the cart of this embodiment;

FIG. 11 is a side view schematically showing a third step of the folding operation of the cart according to the present embodiment;

FIG. 12 is a schematic view in section along the P-P direction in FIG. 11;

FIG. 13 is an enlarged schematic view of FIG. 12 at C;

FIG. 14 is a schematic side view of the cart in a collapsed condition;

Fig. 15 is a schematic diagram of the working principle between the first operating member and the first unlocking member in the present embodiment, where the first unlocking member is located at the first position;

Fig. 16 is a schematic diagram of the working principle between the first operating member and the first unlocking member in the present embodiment, where the first unlocking member is located at the second position;

wherein: 100. a frame; 200. a front wheel assembly; 300. a rear wheel assembly; 400. a handle;

1. A bottom bracket assembly; 11. a front bracket; 111. a front strut; 111a, first tooth slots; 112. a sliding chamber; 113. a connector; 114. a connecting shaft; 12. a support frame; 121. a support base; 122. a support rod; 122a (122 b), a second gullet; 13. a rear bracket; 131. a rear strut; 131a (131 b), a third tooth slot; 14. a first operating member; 141. a driving section; 141a, a driving surface; 15. a first unlocking member; 151. a first unlocking surface; 152. a mating portion; 152a, mating surfaces; 16. a second unlocking member; 161. a second unlocking surface; 17. a connecting frame; 171. a front connecting frame; 172. a rear connecting frame; 2. a push rod frame; 21. an upper push rod; 22. a push rod is downwards pushed; 22a, fourth tooth grooves; 3. a first locking assembly; 31. a first locking member; 311. a first mating surface; 312. a convex column; 32. a second locking member; 4. a second locking assembly; 41. a third locking member; 411. a second mating surface; 5. seat pocket device; 51. a seat; 52. a backrest; 53. an armrest; 54. foot pedal; 541. an opening;

X0, rotation center line; x1, a first rotation center line; x2, a second rotation center line; x3, a third rotation center line; x4, a fourth rotation center line; x5, a fifth rotation center line; x6, sixth 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, a cart comprises a frame 100 having an unfolded state and a folded state, and a locking mechanism for locking the frame 100 in the unfolded state, wherein the frame 100 comprises a foldable bottom bracket assembly 1 and a push rod frame 2 capable of being folded relative to the bottom bracket assembly 1, the bottom bracket assembly 1 comprises a first bracket, a second bracket and a third bracket, the first bracket, the second bracket and the third bracket are connected in a rotating manner around a first rotation center line X1, and the locking mechanism comprises a first locking assembly 3 arranged among the first bracket, the second bracket and the third bracket.

The bottom bracket assembly 1 further comprises a first unlocking assembly for unlocking the first locking assembly 3, the first unlocking assembly at least comprises a first operating member 14, the first operating member 14 is rotatably connected to the first bracket around a second rotation center line X2, wherein the first rotation center line X1 and the second rotation center line X2 are parallel to each other, and a user can unlock the bottom bracket assembly 1 by rotating the first operating member 14 around the second rotation center line X2.

In this embodiment, referring to the drawings, the first bracket is a front bracket 11 extending in the up-down direction, the second bracket is a support bracket 12, the third bracket is a rear bracket 13 extending in the up-down direction, the first rotation center line X1 extends in the left-right direction, the upper portion of the front bracket 11, the upper portion of the rear bracket 13, and the lower portion of the support bracket 12 are rotatably connected together about the first rotation center line X1, and the front bracket 11, the support bracket 12, and the rear bracket 13 are sequentially arranged in the extending direction of the first rotation center line X1.

Referring to fig. 2, the front bracket 11 includes two front struts 111 provided separately on the left and right sides, the rear bracket 13 includes two rear struts 131 provided separately on the left and right sides, the support frame 12 includes a support seat 121 extending in the front-rear direction, and a bracket portion located below the support seat 121, and the bracket portion is rotatably connected with the front bracket 11 and the rear bracket 13. In this embodiment, the support portion is two support rods 122 extending downward from the bottom of the support base 121, a connecting shaft 114 extending along the left-right direction is disposed between the upper portions of the two front support rods 111, the axis of the connecting shaft 114 and the first rotation axis X1 extend in a collinear manner, the lower portions of the support rods 122 and the upper portions of the rear support rods 131 are both rotatably connected to the connecting shaft 114, and in the left-right direction, the lower portions of the two support rods 122 are disposed between the upper portions of the two front support rods 111, and the upper portions of the two rear support rods 131 are disposed between the lower portions of the two support rods 122.

In this embodiment, the bottom bracket assembly 1 further includes a connection frame 17 connected between the front bracket 11 and the rear bracket 13, the connection frame 17 extends in the front-rear direction in the unfolded state, and includes a front connection frame 171 and a rear connection frame 172, wherein the front portion of the front connection frame 171 is rotatably connected to the lower portion of the front bracket 11 about a fourth rotation center line X4, the rear portion of the rear connection frame 172 is rotatably connected to the upper portion of the rear bracket 13 about a fifth rotation center line X5, the rear portion of the front connection frame 171 is rotatably connected to the front portion of the rear connection frame 172 about a sixth rotation center line X6, the fourth rotation center line X4, the fifth rotation center line X5 and the sixth rotation center line X6 are parallel to each other and all extend in the left-right direction, and the first rotation center line X1 is located above the fifth rotation center line X5 in the length direction of the rear bracket 13.

The push rod rest 2 is rotatably connected with the bottom bracket assembly 1 about a first rotation center line X1, and the push rod rest 2 is located between the rear brackets 13 on both sides in the left-right direction. In this embodiment, the push rod frame 2 can be folded along the length direction, and includes an upper push rod 21 and a lower push rod 22 that slide and stretch along the length direction, wherein the lower part of the upper push rod 21 is inserted in the rod cavity of the lower push rod 22 in a sliding fit manner, and the lower part of the lower push rod 22 is rotatably connected to the connecting shaft 114 and located between the two rear struts 131. The cart further comprises a front wheel assembly 200 and a rear wheel assembly 300 at the bottom of the frame 100, wherein the front wheel assembly 200 is disposed at the bottom of the front bracket 11, and the rear wheel assembly 300 is disposed at the bottom of the rear bracket 13.

The stroller is further provided with a seat pocket device 5 for sitting and standing a child, which is movably provided on the support base 121. In the unfolded state, the seat pocket device 5 has a forward use position against the push rod holder 2 and a reverse use position facing the push rod holder 2. In this embodiment, referring to fig. 1, 2 and 6, the seat pocket device 5 includes a seat 51, a backrest 52 and an armrest 53, the seat 51 is rotatably connected to a support base 121 about a rotation center line X0 extending in a vertical direction, a rear portion of the seat 51, a lower portion of the backrest 52 and a rear portion of the armrest 53 are rotatably connected together about a third rotation center line X3, the seat pocket device 5 further includes a step 54 rotatably connected to a front portion of the seat 51 and extending downward from the front portion of the seat 51, the step 54 is provided with an opening 541 extending in an up-down direction, and the push rod frame 2 is inserted into the opening 541 when the seat pocket device 5 is in a reverse use position. A reversing locking device is further arranged between the seat 51 and the supporting seat 121, so that the seat 51 and the supporting seat 121 can be mutually locked when the seat pocket device 5 is in the forward use position or the reverse use position.

In this embodiment, a set of first locking components 3 and a set of first unlocking components are disposed between each set of front struts 111, support struts and rear struts 131. The first locking assembly 3 includes a first locking member 31 disposed between the front bracket 11 and the support bracket 12 and used for locking the front bracket 11 and the support bracket 12 to each other, and a second locking member 32 disposed between the support bracket 12 and the rear bracket 13 and used for locking the rear bracket and the support bracket to each other, wherein the first locking member 31 and the second locking member 32 are slidably disposed along an extending direction of the first rotation center line X1, and the first locking member 31 and the second locking member 32 are abutted to each other along an axial direction.

Specifically, as shown in fig. 2 to 5, the upper portion of the front strut 111 is provided with a first tooth slot 111a, the left and right sides of the lower portion of the support rod 122 are respectively provided with second tooth slots 122a and 122b, the left and right sides of the upper portion of the rear strut 131 are respectively provided with third tooth slots 131a and 131b, and the first locking member 31 and the second locking member 32 are respectively provided with locking teeth. When the frame 100 is in the unfolded state, on each of the left and right sides of the frame 100, a part of the locking teeth of the first locking member 31 are inserted into the first tooth grooves 111a and another part of the locking teeth of the first locking member are inserted into the second tooth grooves 122a, so that the front bracket 11 and the support bracket 12 cannot rotate relatively, while a part of the locking teeth of the second locking member 32 are inserted into the second tooth grooves 122b and another part of the locking teeth are inserted into the third tooth grooves 131a, so that the support bracket 12 and the rear bracket 13 cannot rotate relatively.

In this embodiment, on each of the left and right sides of the frame 100, a plurality of protruding columns 312 are disposed on the side of the first locking member 31 near the supporting frame 12, the protruding columns 312 extend from the first locking member 31 to the second locking member 32 along the left and right directions, a through hole is disposed at the lower portion of the supporting rod 122, and the protruding columns 312 can pass through the through hole and abut against the second locking member 32.

The first operating members 14 in the two sets of first unlocking components are fixedly connected or integrally provided, and in this embodiment, a handle 400 is rotatably connected to the upper portion of the front bracket 11, and the left and right end portions of the handle 400 constitute two first operating members 14. Specifically, the front bracket 11 is provided with connectors 113, the connectors 113 are respectively arranged at two left and right sides, the two connectors 113 are respectively arranged at the upper ends of the two front struts 111, and on the extending direction of the length of the front struts 111, the connectors 113 are arranged above the first rotation center line X1, the left and right ends of the handle 400 are respectively connected to the connectors 113 in a rotating manner around the second rotation center line X2, and in the rotating process of the handle 400 around the second rotation center line X2, the left and right ends of the handle 400 can drive the first locking assembly 3 to unlock.

The first unlocking component further comprises a first unlocking piece 15, the first unlocking piece 15 is arranged between the first locking piece 31 and the front bracket 11, specifically, the first unlocking piece 15 is arranged at the upper part of the front bracket 11, the first unlocking piece 15 can slide relative to the front bracket 11 along the direction perpendicular to the first rotation center line X1, the first unlocking piece 15 has a first position and a second position, the first unlocking piece 15 is arranged at the first position, and the first locking component 3 is in a locking state; the first unlocking member 15 is in the second position, and the first locking assembly 3 is in the unlocked state. The first unlocking assembly further comprises a first resilient member (not shown) for providing the force required for the movement of the first unlocking member 15 towards the first position. In this embodiment, in the unfolded state, the first unlocking member 15 extends obliquely from bottom to top, and the first unlocking member 15 is shifted from the first position to the second position during the downward movement in the direction perpendicular to the first rotation center line X1.

A first unlocking structure is provided between the first locking member 31 and the first unlocking member 15, the first unlocking structure being configured to urge the first locking member 31 and the second locking member 32 away from the front bracket 11 during movement of the first unlocking member 15 from the first position towards the second position, the first locking assembly 3 further comprising a second elastic member (not shown in the figures) for providing the force required for the movement of the second locking member 32 towards the front bracket 11. In this embodiment, the first unlocking structure includes a first unlocking surface 151 disposed on the first unlocking member 15, and a first mating surface 311 disposed on the first locking member 31, where the first unlocking surface 151 is an inclined surface that gradually extends away from the first locking member 31 from the first position to the second position, and the first mating surface 311 is consistent with the extending direction of the first unlocking surface 151, and two sets of first mating surfaces 311 and first unlocking surfaces 151 are disposed between the first locking member 31 and the first unlocking member 15.

When the frame 100 is in the unfolded state, the first mating surface 311 is attached to the first unlocking surface 151, and when the first unlocking member 15 moves downward and is converted from the first position to the second position, the first unlocking surface 151 slides in cooperation with the first mating surface 311 and makes the first locking member 31 far away from the front bracket 11 along the direction of the first rotation center line X1, in this process, the boss 312 of the first locking member 31 pushes the second locking member 32 away from the support bracket 12, and when the first unlocking member 15 moves to the second position, as shown in fig. 12 and 13, the locking teeth of the first locking member 31 withdraw from the first tooth groove 111a and are all inserted into the second tooth groove 122a, and the locking teeth of the second locking member 32 withdraw from the second tooth groove 122b and are all inserted into the third tooth groove 131a, so that the front bracket 11, the support bracket 12 and the rear bracket 13 can rotate relatively.

A driving structure is provided between the first operating member 14 and the first unlocking member 15, and the driving structure is configured to drive the first unlocking member 15 to slide between the first position and the second position during rotation of the first operating member 14 about the second rotation center line X2. In this embodiment, the driving structure includes a driving portion 141 disposed on the first operating member 14, and an engaging portion 152 disposed on the first unlocking member 15 and configured to be engaged with the driving portion 141, the driving portion 141 includes a driving surface 141a, the driving surface 141a is a cam surface, the engaging portion 152 has an engaging surface 152a that is engaged with and abutted against the cam surface, and the engaging surface 152a always abuts against the cam surface.

Referring to fig. 15 and 16, a sliding cavity 112 is provided on the front bracket 11, the first unlocking member 15 is disposed in the sliding cavity 112 and can slide along its length direction, a through hole communicating with the sliding cavity 112 is provided on the upper portion of the front bracket 11, and the engaging portion 152 can extend out of the sliding cavity 112 from the through hole and engage with the driving portion 141; the mating surface is located below the cam surface, and the cam surface is a curved surface with the second rotation center line X2 as an axis, as shown in fig. 15, and the distance between the point on the cam surface and the second rotation center line X2 gradually increases along the counterclockwise direction, so that the cam surface will push the mating portion 152 to move downward and the first unlocking member 15 slides downward in the sliding cavity 112 to the second position during the backward rotation of the handle 400.

The locking mechanism further comprises a second locking component 4 used for locking the rear bracket 13 and the push rod frame 2 with each other, and a second unlocking component which can be linked to unlock the second locking component 4 in the process of folding the push rod frame 2 along the length direction is arranged between the push rod frame 2 and the second locking component 4.

In this embodiment, as shown in fig. 2 and 5, a set of second locking assemblies 4 are disposed between the lower portion of the push down rod 22 and the rear struts 131 on both sides, the second locking assemblies 4 include a third locking member 41 slidably disposed between the rear struts 131 and the push down rod 22 along the first rotation center line X1, the third locking member 41 is also provided with locking teeth, and both the left and right sides of the lower portion of the push down rod 22 are provided with fourth tooth grooves 22a. In the unfolded state of the frame 100, a part of the locking teeth of the third locking member 41 is inserted in the third tooth groove 131b and another part is inserted in the fourth tooth groove 22a, so that the putter frame 2 and the rear bracket 13 are locked to each other.

The second unlocking component comprises a second unlocking piece 16 slidably arranged on the push-down rod 22 along the length extending direction of the push-down rod 22, and a second unlocking structure for driving the third locking piece 41 to slide and unlock in the process that the second unlocking piece 16 slides downwards along the push-down rod 22 is arranged between the second unlocking piece 16 and the third locking piece 41. The second unlocking structure includes second unlocking surfaces 161 disposed on the left and right sides of the second unlocking member 16, and second mating surfaces 411 disposed on the third locking member 41, where the second unlocking surfaces 161 are inclined surfaces extending along the length direction of the push rod frame 2 gradually away from the third locking member 41 from top to bottom, and the second mating surfaces 411 are consistent with the extending direction of the second unlocking surfaces 161, in this embodiment, two sets of second unlocking surfaces 161 are disposed on the left and right sides of the second unlocking member 16 along the length extending direction of the second unlocking member, and two sets of second mating surfaces 411 are disposed on each corresponding third locking member 41.

When the frame 100 is in the unfolded state, as shown in fig. 5, the second mating surface 511 is attached to the second unlocking surface 611, and the upper push rod 21 slides and folds relative to the lower push rod 22, so that the second unlocking member 16 slides downward along the length direction of the lower push rod 22, the second unlocking surface 611 slides in a mating manner with the second mating surface 511 and drives the third locking member 41 to move away from the push rod frame 2 along the direction of the first rotation center line X1, and when the upper push rod 21 and the lower push rod 22 fold together, as shown in fig. 8 and 9, the locking teeth of the third locking member 41 withdraw from the fourth tooth groove 22a and are all inserted into the third tooth groove 131b, and the push rod frame 2 can rotate relative to the rear bracket 13.

In the unfolded state of the frame 100, as shown in fig. 3 to 6, the front bracket 11 is extended obliquely backward from bottom to top, the rear bracket 13 is extended obliquely forward from bottom to top, the support frame 12 is extended in the up-down direction and is located above the front bracket 11 and the rear bracket 13, the front connection frame 171 is extended in the same length direction as the rear connection frame 172, the connection frame 17 is extended obliquely backward from front to top, the putter frame 2 is extended obliquely backward from bottom to top, the handle 400 is folded behind the support bar 122, and the handle 400 is restricted between the support bar 122 and the putter frame 2 so as not to be rotated backward. In this state, the caretaker can rotate the seat pocket device 5 between the forward use position and the reverse use position, and the child sits on the seat 51, and when the seat pocket device 5 is in the forward use position, the child faces forward, the visual field is wide, and when the seat pocket device 5 is in the reverse use position, the child faces the caretaker, and the caretaker can observe the state of the child at all times.

When the frame 100 is folded, referring to fig. 7 to 13, the backrest 52 and the armrest 53 are folded downward around the third rotation center line X3, so that the backrest 52 and the armrest 53 are folded relative to the seat 51, the upper push rod 21 and the lower push rod 22 are driven to fold along the length direction, and in the process that the upper push rod 21 slides downward along the length direction, the lower end part of the upper push rod 21 drives the second unlocking member 16 to slide downward along the length direction of the lower push rod 22 and unlock the second locking assembly 4; the push rod frame 2 is turned downwards around the first rotation center line X1 to be folded relative to the rear bracket 13; after the push rod frame 2 is folded relative to the rear bracket 13, the rotation restriction of the handle 400 is released, and at this time, the handle 400 is rotated backwards around the second rotation center line X2 and lifted upwards; the handle 400 drives the first unlocking piece 15 to move to the second position in the rotating process, so that the first locking component 3 is unlocked, the front bracket 11 rotates backwards around the first rotation center line X1 under the action of gravity and is folded relative to the rear bracket 13, and the front bracket 11 drives the front connecting frame 171 and the rear connecting frame 172 to be folded relative to each other and to be folded together with the rear bracket 13 in the backward rotating process; in this embodiment, the center of gravity of the seat pocket device 5 is located in front of the first rotation center line X1 along the front-rear direction, and under the action of the dead weight, the seat pocket device 5 drives the support frame 12 to fold down together and fold up relative to the rear support frame 13.

In the folded state of the frame 100, as shown in fig. 14, the seat pocket device 5, the front frame 11, the rear frame 13, and the push rod frame 2 are folded together in sequence in the front-rear direction, the connection frame 17 is folded between the front frame 11 and the rear frame 13, and the rear wheel assembly 300 is folded between the front wheel assemblies 200 in the left-right direction, in which state the handle 400 is located at the upper side of the frame 100, and a user can lift the folded cart upward through the handle 400, thereby moving the cart to other positions.

To sum up, when the cart is folded, after the seat pocket device 5 and the push rod frame 2 are folded, a user only needs to rotate the handle 400 backwards and lift the handle 400, the locking of the bottom bracket assembly 1 can be released in the rotating process of the handle 400, and the bottom bracket assembly 1 can be automatically folded under the action of the gravity of each component, so that the folding operation is simple and continuous.

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 (12)

1. A cart, characterized by: the cart comprises a cart frame with an unfolding state and a folding state, and a locking mechanism for locking the cart frame in the unfolding state, wherein the cart frame comprises a foldable bottom bracket component and a pushing rod frame which can be folded relative to the bottom bracket component, the bottom bracket component comprises a first bracket, a second bracket and a third bracket,

The first bracket, the second bracket and the third bracket are connected together in a rotating way around a first rotating central line, the locking mechanism comprises a first locking component which is arranged among the first bracket, the second bracket and the third bracket,

The bottom bracket assembly further comprises a first unlocking assembly for unlocking the first locking assembly, the first unlocking assembly at least comprises a first operating piece, the first operating piece is rotationally connected to the first bracket around a second rotation center line, and the first rotation center line and the second rotation center line are parallel to each other.

2. The cart of claim 1, wherein: the first unlocking component further comprises a first unlocking piece which is slidably arranged on the first bracket along the direction perpendicular to the first rotation center line, the first unlocking piece is provided with a first position and a second position, the first unlocking piece is positioned at the first position, and the first locking component is positioned in a locking state; the first unlocking piece is positioned at the second position, the first locking assembly is in an unlocking state, the first unlocking assembly further comprises a first elastic piece used for providing acting force required by the movement of the first unlocking piece towards the first position, a driving structure is arranged between the first operating piece and the first unlocking piece, and the driving structure is configured to drive the first unlocking piece to slide between the first position and the second position in the process of rotating the first operating piece around the second rotation center line.

3. The cart of claim 2, wherein: the first bracket, the second bracket and the third bracket are sequentially arranged along the extending direction of the first rotation center line, the first locking component comprises a first locking piece which is arranged between the first bracket and the second bracket and is used for locking the first bracket and the second bracket with each other, and a second locking piece which is arranged between the second bracket and the third bracket and is used for locking the second bracket and the third bracket with each other,

The first locking piece and the second locking piece are both arranged in a sliding way along the extending direction of the first rotation center line, the first locking piece and the second locking piece are mutually abutted along the axial direction, the first unlocking piece is arranged between the first locking piece and the first bracket,

A first unlocking structure is arranged between the first locking piece and the first unlocking piece, the first unlocking structure is configured to drive the first locking piece and the second locking piece to move away from the first bracket in the process that the first unlocking piece moves from the first position to the second position, and the first locking assembly further comprises a second elastic piece used for providing acting force required by the movement of the second locking piece towards the first bracket.

4. A cart according to claim 3, wherein: the first unlocking structure comprises a first unlocking surface arranged on the first unlocking piece and a first matching surface arranged on the first locking piece, and the first unlocking surface is an inclined surface which gradually extends from the first position to the second position and gradually away from the first locking piece in an inclined manner.

5. The cart of claim 2, wherein: the driving structure comprises a driving part arranged on the first operating piece, and a matching part arranged on the first unlocking piece and used for being matched with the driving part, the driving part comprises a driving surface, the driving surface is a cam surface, the matching part is provided with a matching surface which is matched and abutted with the cam surface, and the matching surface is always abutted to the cam surface.

6. The cart of claim 5, wherein: the first bracket is provided with a sliding cavity for providing sliding of the first unlocking piece, and the matching part extends out of the sliding cavity and is matched with the driving part.

7. The cart of claim 1, wherein: the first support includes two first branches, the second support includes two second branches, the third support includes two third branches, two second branches are located two along left and right directions between the first branches, two third branches are located two second branches along left and right directions between, every group first branch the second branch reaches all be provided with a set of between the third branch first locking component with a set of first unblock subassembly, two sets of in the first unblock subassembly first operating element fixed connection or integrative setting.

8. The cart of claim 7, wherein: the push rod frame is rotationally connected with the bottom bracket assembly around the first rotation center line, wherein the push rod frame is positioned between the two third support rods along the left-right direction, the locking mechanism further comprises a second locking assembly used for mutually locking the third support rods and the push rod frame, the push rod frame can be arranged in a folding way along the length direction, and a second unlocking assembly capable of being in linkage in the folding process of the push rod frame along the length direction and used for unlocking the second locking assembly is arranged between the push rod frame and the second locking assembly.

9. The cart of claim 8, wherein: the push rod frame comprises a lower push rod and an upper push rod which slide and stretch along the length direction, the lower part of the upper push rod is inserted in a rod cavity of the lower push rod in a sliding fit manner, the second unlocking component comprises a second unlocking piece which is arranged on the lower push rod in a sliding manner along the length extension direction of the lower push rod, the second unlocking piece slides downwards along the length direction of the lower push rod in a linkage manner in the sliding and folding process of the upper push rod relative to the lower push rod, a group of second locking components are arranged between the lower part of the lower push rod and the third support rods on two sides and between the lower part of the lower push rod and the third support rods on two sides, the second locking component at least comprises a third locking piece which is arranged between the third support rods and the lower push rod in a sliding manner along the first rotation center line,

And a second unlocking structure for driving the third locking piece to slide and unlock in the process that the second unlocking piece slides downwards along the push rod is arranged between the second unlocking piece and the third locking piece.

10. The cart of any one of claims 1 to 9, wherein: the frame is in under the expansion state, first support backward slope extends from bottom to top, the third support forward slope extends from bottom to top, the second support extends along upper and lower direction and is located first support with the top of third support, the upper portion of first support, the lower part of second support and the upper portion of third support are jointly around first rotation central line rotationally connects, first operating piece sets up the upper portion of first support.

11. The cart of claim 10, wherein: the second bracket comprises a supporting seat extending along the front-back direction, a bracket part positioned below the supporting seat, the bracket part is rotationally connected with the first bracket and the third bracket, the cart further comprises a seat pocket device movably arranged on the supporting seat, and the seat pocket device at least has a forward use position for leaning against the push rod frame and a reverse use position facing the push rod frame.

12. The cart of claim 11, wherein: the seat pocket device at least comprises a seat, the seat is rotationally connected to the supporting seat around a rotation center line extending in the vertical direction, and a reversing locking device for locking the seat and the supporting seat relative to each other is arranged between the seat and the supporting seat.