WO2022121897A1

WO2022121897A1 - Foldable cart

Info

Publication number: WO2022121897A1
Application number: PCT/CN2021/136108
Authority: WO
Inventors: 张兴荣; 石平中
Original assignee: 好孩子儿童用品有限公司
Priority date: 2020-12-11
Filing date: 2021-12-07
Publication date: 2022-06-16
Also published as: CN113415334A; CN215904558U; CN113415334B; CN112660228A

Abstract

A foldable cart, comprising front supports (1), rear supports (2) and upper supports (3). The front supports (1), rear supports (2) and upper supports (3) are oppositely opened when the foldable cart is opened; and when the foldable cart is folded, the front supports (1), rear supports (2) and upper supports (3) are oppositely move close together. The front supports (1) are connected to front wheels by means of a front linkage mechanism, and the rear supports (2) are connected to rear wheels by means of a rear linkage mechanism. When the foldable cart is folded, the front wheels and rear wheels are lifted upward and turned over until axles thereof extend in the front-rear direction.

Description

a foldable cart

technical field

The invention relates to the field of carts, in particular to a foldable cart.

Background technique

A stroller is a common tool in daily life and production, and is also widely used in the field of children's products, such as a baby stroller, among which, a folding stroller is widely used as a baby transportation tool. It is easy to fold, and the volume is small after folding, which makes it easy to store and carry, which is the demand of consumers for the use of folding strollers. The folding stroller in the prior art generally includes a foldable frame, a wheel mounted under the frame, and a seat for the infant to be mounted on the frame, but the existing folding stroller generally After being folded, the volume is large, and it takes up more space for carrying and storage.

In addition, the existing baby stroller usually requires the cooperation of both hands during the folding process, and it is difficult to complete the folding operation of the stroller with one hand.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a foldable cart with a small volume that can complete the folding operation with one hand and is folded.

In order to achieve the above object, the concrete technical scheme adopted in the present invention is as follows:

A foldable cart, comprising an openable and foldable frame, a front wheel assembly and a rear wheel assembly connected to the bottom of the frame, the frame including a left bracket on the left side and a left bracket on the right side The right bracket of the part, the left bracket and the right bracket respectively include: an upper bracket, a front bracket connected to the front wheel assembly at the bottom, a rear bracket connected to the rear wheel assembly at the bottom, and the upper bracket , any two of the front bracket and the rear bracket are rotatably connected to each other, and the other one is rotatably connected to at least one of the two. When the frame is in the open state, the upper bracket, the front bracket, the The rear brackets are relatively unfolded, and when the frame is in a folded state, the upper bracket, the front bracket and the rear bracket are close to each other;

A front linkage mechanism is arranged between the front bracket and the front wheel assembly, or/and a rear linkage mechanism is arranged between the rear bracket and the rear wheel assembly;

When the frame changes from the open state to the folded state, the front linkage mechanism drives the front wheel assembly to move upward along the length of the front bracket, or/and the rear linkage mechanism drives The rear wheel assembly moves upward along the length of the rear bracket.

Further, the left bracket and the right bracket further include:

a push rod, the lower part of the push rod is rotatably connected with the upper part of the upper bracket,

an upper link, the upper part of the upper link is rotatably connected with the lower part of the push rod, and the upper link is rotatably connected with the rear bracket;

a front link, the front link extends in the front-rear direction in the open state of the frame, and the front part of the front link is rotatably connected with the front bracket;

a rear link, the rear link extends in the front-rear direction in the open state of the frame, the front part of the rear link is rotatably connected with the rear part of the front link, and the rear part of the rear link The part is rotatably connected with the rear bracket;

A sliding member is slidably connected with the rear link along the lengthwise extending direction of the rear link, and the lower portion of the upper link is connected with the sliding member.

Further, the sliding member is a double sliding sleeve, the double sliding sleeve is sleeved on the rear connecting rod, and the lower part of the upper connecting rod is rotatably connected with the double sliding sleeve.

Further, the front wheel assembly includes a front wheel joint and a front wheel rotatably connected with the front wheel joint, and the front wheel joint and the front bracket are slidably connected through a front linkage mechanism.

Further, the rear wheel assembly includes a rear wheel joint and a rear wheel rotatably connected to the rear wheel joint, and the rear wheel joint and the rear bracket are slidably connected through a rear linkage mechanism.

Further, the front wheel joint is sleeved on the front bracket, the front wheel joint is provided with a first through hole, and the front bracket is provided with a first chute extending along the length direction of the front bracket , the front linkage mechanism includes:

A front connecting piece, the first end of the front connecting piece is connected with the front bracket and the front wheel joint through a second shaft, and the second shaft passes through the first through hole and can sliding in the first chute, the second end of the front connecting piece is rotatably connected with the front connecting rod through a third shaft;

When the frame changes from the open state to the folded state, the front link moves toward the front bracket, and the second shaft slides upward in the first chute to drive the front wheel Components slide up.

Further, the rear wheel joint is sleeved on the rear bracket, the rear wheel joint is provided with a second through hole, and the rear bracket is provided with a second chute extending along the length direction of the rear bracket , the rear linkage mechanism includes:

a rear connecting piece, the first end of the rear connecting piece is connected with the rear bracket and the rear wheel joint through a fifth shaft, and the fifth shaft passes through the second through hole and can sliding in the second chute, the second end of the rear connecting piece is rotatably connected to the rear connecting rod through a sixth shaft;

When the frame changes from the open state to the folded state, the rear link moves closer to the rear bracket, and the fifth shaft slides upward in the second chute to drive the The rear wheel slides up.

Further, the foldable cart includes the front linkage mechanism and the rear linkage mechanism, the front bracket is provided with a third chute, the front link passes through the third chute and the The front bracket is rotatably connected, the rear bracket is provided with a fourth chute, and the rear link passes through the fourth chute and is rotatably connected to the rear bracket.

Further, the third chute is located under the first through hole, or the fourth chute is located under the second through hole.

Further, the projected length of the third chute on a plane parallel to the length direction of the front support is greater than or equal to the length of the first chute, or the fourth The projected length on a plane parallel to the longitudinal direction of the rear bracket is greater than or equal to the length of the second chute.

Further, the frame also includes a front wheel turning mechanism and a rear wheel turning mechanism, when the frame is in the open state, the axis line of the front wheel of the front wheel assembly and the axis of the rear wheel assembly are The axis lines of the rear wheels all extend in the left and right directions. When the frame is transformed from the open state to the folded state, the front wheel turning mechanism drives the front wheels to turn over and makes the axles of the front wheels turn over. The center line has a tendency to turn to extend in the front-rear direction, and the rear wheel turning mechanism drives the rear wheel to turn over and causes the axis line of the rear wheel to turn to extend in the front-rear direction.

Further, the front wheel turning mechanism includes a first sliding sleeve and a third sliding groove arranged on the first sliding sleeve, and the rear wheel turning mechanism includes a second sliding sleeve and a second sliding sleeve arranged on the second sliding sleeve. The first sliding sleeve is slidably sleeved on the front bracket, and the lower end of the first sliding sleeve is connected to the front wheel assembly; the second sliding sleeve is slidably sleeved on the rear on the bracket, and the lower end of the second sliding sleeve is connected with the rear wheel assembly;

The third chute and the fourth chute are both spiral groove structures;

When the frame transitions from the open state to the folded state, the front link slides along the third chute, so that the first sliding sleeve drives the front wheel assembly to rotate; the The rear link slides along the fourth chute, so that the second sliding sleeve drives the rear wheel assembly to rotate.

Further, a first through hole is formed in the circumferential direction of the first sliding sleeve, and a first sliding groove extending along the length direction of the front bracket is formed on the front bracket;

The second sliding sleeve is provided with a second through hole, and the rear bracket is provided with a second chute extending along the length direction of the rear bracket;

The first through hole extends for a certain length along the circumferential direction of the first sliding sleeve, the second through hole extends for a certain length along the circumferential direction of the second sliding sleeve, and the first through hole is in contact with the first through hole. The projected length of a chute on a plane parallel to the width direction is greater than or equal to the projected length of the third chute on a plane parallel to the width direction of the first chute; the second through hole is in the The projected length of the fourth chute on a plane parallel to the width direction of the second chute is greater than or equal to the projected length of the fourth chute on a plane parallel to the width direction of the second chute.

Further, the projected length of the third chute on a plane parallel to the length direction of the front bracket is greater than or equal to the length of the first chute, and the fourth chute is on the plane parallel to the rear bracket. The projected length on a plane parallel to the length direction is greater than or equal to the length of the second chute.

Further, the third sliding groove is located below the first through hole, and the fourth sliding groove is located below the second through hole.

Further, the left bracket and the right bracket further include:

When the frame is in the folded state, the upper link is at least partially accommodated between the upper bracket and the rear bracket, and/or the front bracket is at least partly accommodated inside the upper link.

Further, the left bracket and the right bracket further include:

an upper link, the upper part of the upper link is rotatably connected with the lower part of the push rod, the upper link is rotatably connected with the rear bracket; the lower part of the upper link is arranged on the outer side of the rear bracket, The upper part is arranged on the inner side of the upper bracket through the upper connecting piece; when the frame is in the folded state, the rotation axis line of the upper bracket and the rear bracket is located in front of the rotation axis line of the front bracket and the rear bracket , and the two axes of rotation are approximately at the same height.

The beneficial effects brought by the technical scheme provided by the invention are as follows:

1) When the cart is folded, the cart not only folds in the front-rear direction, but also the wheels can be lifted up, that is, the height of the folded cart is further reduced in the up-down direction;

2) The user can press the push handle of the cart with one hand to fold the cart, which is convenient for folding the cart while holding the child.

Description of drawings

In order to illustrate the technical solutions in the embodiments of the present invention more clearly, the following briefly introduces the accompanying drawings used in the description of the embodiments. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained from these drawings without creative effort.

1 is a schematic diagram of a foldable cart provided in an embodiment of the present invention in an open state;

FIG. 2 is a side view of the foldable cart provided by an embodiment of the present invention in an open state;

3 is a cross-sectional view of the foldable cart provided by an embodiment of the present invention in an open state;

4 is a schematic diagram of a foldable cart provided by an embodiment of the present invention during a folding process;

5 is a side view of the foldable cart provided by the embodiment of the present invention during the folding process;

6 is a partial schematic diagram of a foldable cart provided in an embodiment of the present invention during a folding process;

7 is a schematic diagram of a foldable cart provided by an embodiment of the present invention in a folded state;

8 is a side view of the foldable cart provided by an embodiment of the present invention in a folded state;

FIG. 9 is a front view of a foldable cart provided by an embodiment of the present invention in a folded state.

Wherein, the reference numerals include: 1-front bracket, 11-first sliding sleeve, 111-third sliding groove, 112-first through hole, 12-front connecting rod, 121-seventh shaft, 13-front connecting piece , 131-second shaft, 132-third shaft, 14-first chute, 15-first shaft, 2-rear bracket, 21-second sliding sleeve, 211-fourth chute, 212-second pass Hole, 22-rear link, 23-rear connector, 231-fifth shaft, 232-sixth shaft, 24-second chute, 25-second shaft, 3-upper bracket, 4-push rod, 5 -upper link, 51-double sliding sleeve, 6-seat plate, 61- connecting rod connected with the seat plate, 7-front wheel, 8-rear wheel, 9-accommodating cavity.

Detailed ways

In order to make those skilled in the art better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only Embodiments are part of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

It should be noted that the terms "first", "second" and the like in the description and claims of the present invention and the above drawings are used to distinguish similar objects, and are not necessarily used to describe a specific sequence or sequence. It is to be understood that the data so used may be interchanged under appropriate circumstances such that the embodiments of the invention described herein can be practiced in sequences other than those illustrated or described herein. Furthermore, the terms "comprising" and "having", and any variations thereof, are intended to cover non-exclusive inclusion.

The front, back, up and down mentioned in the present invention are all based on the corresponding orientation when the foldable cart is in the open state. After the cart is folded, it can be placed in reverse order, but the orientation of its components is not based on the physical orientation at this time, but the orientation of each part of the opened cart; especially the front and rear directions, respectively. Taking the forward direction of the cart as the forward direction and its backward direction as the back direction, determine the left, right, and up and down directions while standing behind the cart and facing the cart.

In this embodiment, as shown in Figures 1-9, a foldable cart is provided, including an openable and foldable frame, a front wheel assembly 7 and a rear wheel assembly 8 connected to the bottom of the frame, the frame It includes a left bracket located on the left side, a right bracket located on the right side, and a middle connecting bracket configured to connect the left bracket and the right bracket; the left bracket and the right bracket respectively include: an upper bracket 3, a bottom connection The front bracket 1 of the front wheel assembly 7 and the rear bracket 2 of the rear wheel assembly 8 are connected at the bottom, and any two of the upper bracket 3, the front bracket 1, and the rear bracket 2 are rotatably connected to each other. Any two of the upper part of the bracket 1 and the upper part of the rear bracket 2 are rotatably connected to each other. In this embodiment, the lower part of the upper bracket 3 and the upper part of the front bracket 1 are respectively rotatably connected to the upper part of the rear bracket 2. In the state, the upper bracket 3 , the front bracket 1 , and the rear bracket 2 are relatively unfolded. In this embodiment, as shown in FIG. Oblique rear and top of the axis of rotation. When the frame is in the folded state, the upper bracket 3 , the front bracket 1 and the rear bracket 2 are close to each other.

In this embodiment, the intermediate connecting frame cannot be folded in the left-right direction, and the folding direction of the cart is the front-rear direction. The folded cart has a smaller thickness and smaller volume through the following various structural features, as described below: In this embodiment, the front wheel assembly 7 is rotatably and slidably connected to the front bracket 1 , and the rotation axis and the relative sliding direction between the two are respectively parallel to the length direction of the front bracket 1 . A front linkage mechanism is arranged between the front wheel assemblies 7; and/or, the rear wheel assembly 8 is rotatably and slidably connected to the rear bracket 2, and the rotation axis line and the relative sliding direction between the two are connected to the rear bracket 2. The length direction of 2 is parallel, and a rear linkage mechanism is arranged between the rear bracket 2 and the rear wheel assembly 8; when the frame changes from the open state to the folded state, the front linkage mechanism drives the front wheel assembly 7 along the length of the front bracket 1. The direction of the upward direction At the same time, the rear linkage mechanism drives the rear wheel assembly 8 to move upward along the length of the rear bracket 2 . Alternatively, only the front linkage mechanism or the rear linkage mechanism may be provided, and the corresponding wheel assembly can be stowed when the frame is folded.

When the frame changes from the open state shown in Figures 1-3 to the folded state shown in Figures 7-9, the front linkage mechanism drives the front wheel assembly 7 to move upward along the length of the front bracket 1, and/or the rear linkage mechanism The rear wheel assembly 8 is driven to move upward along the length of the rear bracket 2, so that the front wheel assembly 7 and/or the rear wheel assembly 8 are slid and retracted along the bracket, and the height of the folded cart in the vertical direction is shortened; When the vehicle is unfolded from the folded state, the front linkage mechanism drives the front wheel assembly 7 to move downward along the length direction of the front bracket 1 , and/or the rear linkage mechanism drives the rear wheel assembly 8 to move downward along the length direction of the rear bracket 2 , The front wheel assembly 7 and/or the rear wheel assembly 8 slide down along the bracket, and the height of the unfolded cart is elongated in the up-down direction, so the folded volume of the cart is further reduced to facilitate storage and carrying, and at the same time, it will not be reduced The volume when it is opened is to improve riding comfort; in a specific embodiment, the front wheel assembly 7 and the rear wheel assembly 8 are respectively retracted upwards by 3-6 cm.

The front linkage mechanism and the rear linkage mechanism may include a drive motor, and may also be in the form of pure mechanical linkage; in this embodiment, they are in the form of pure mechanical linkage. As shown in FIG. 6 , one setting method is: the front bracket 1 is provided with a first chute 14 extending along the length direction of the front bracket 1 , and the front linkage mechanism includes a front link 12 , a front connector 13 , and a first sliding sleeve. 11. The rear bracket 2 is provided with a second chute 24 extending along the length direction of the rear bracket 2. The rear linkage mechanism includes a rear connecting rod 22, a rear connecting piece 23 and a second sliding sleeve 21. The structure of the front bracket 1 and the front linkage mechanism, the rear bracket 2 and the rear linkage mechanism on the side or right side) are described in detail, wherein the front link 12 and the rear link 22 on the same side are rotatably connected;

The front part of the front link 12 is rotatably connected to the front bracket 1 through the first shaft 15 , and the first end of the front connecting piece 13 is connected to the front bracket 1 through the second shaft 131 (see FIG. 3 ), and the second shaft 131 can be 3, the second end of the front connector 13 is rotatably connected to the front link 12 through the third shaft 132; referring to FIG. 2, the first sliding sleeve 11 is slidably sleeved on the front On the bracket 1, the first sliding sleeve 11 is provided with a first through hole 112, the second shaft 131 passes through the first through hole 112, and the lower end of the first sliding sleeve 11 is connected to the front wheel assembly 7; When transitioning to the folded state, the front link 12 moves closer to the front bracket 1 , and the second shaft 131 slides upward in the first chute 14 to drive the first sliding sleeve 11 and the front wheel assembly 7 to slide upward. Correspondingly, for the purely mechanical linkage setting of the rear linkage mechanism, see FIG. 3 : the rear portion of the rear link 22 is rotatably connected to the rear bracket 2 through the fourth shaft 25 , and the first end of the rear connecting member 23 is connected through the fifth shaft 23 . The shaft 231 (see FIG. 3 ) is connected with the rear bracket 2 and the fifth shaft 231 can slide in the second chute 24 . Continuing to refer to FIG. 3 , the second end of the rear connecting piece 23 is connected to the rear connecting rod through the sixth shaft 232 22 is rotatably connected; referring to FIG. 2, the second sliding sleeve 21 is slidably sleeved on the rear bracket 2, the second sliding sleeve 21 is provided with a second through hole 212, the fifth shaft 231 passes through the second through hole 212, the second The lower end of the sliding sleeve 21 is connected to the rear wheel assembly 8. When the frame changes from the open state to the folded state, the rear connecting rod 22 moves closer to the rear bracket 2, and the fifth shaft 231 slides upward in the second chute 24 to drive the first The two sliding sleeves 21 and the rear wheel assembly 8 slide upward.

In one of the embodiments, referring to FIG. 3 , the first sliding sleeve 11 or/and the second sliding sleeve 21 have a accommodating cavity 9 , and the lower end of the front bracket 1 and the lower end of the rear bracket 2 are enclosed by the sliding sleeve, which is opposite to the front bracket. 1 and the rear bracket 2 have a protective effect, and also avoid scratching other things. Preferably, when the foldable cart is opened, the accommodating cavity 9 has a 3-6 cm long empty section, as shown in FIG. 3 .

The former linkage mechanism is used as an example to illustrate: in fact, the front link 12, the front connector 13 and the front bracket 1 form a similar triangle, and the second axis 131, the third axis 132 and the first axis 15 on the plane of FIG. 3 are used as the The vertex of the similar triangle, in this similar triangle, the three angles of the triangle are variable in size, the length of the side formed by the front link 12 is unchanged, the length of the side formed by the front connecting piece 13 is unchanged, and the length of the side formed by the front bracket 1 is unchanged. (that is, the distance between the second shaft 131 and the first shaft 15) changes; therefore, when the cart is folded, since the front link 12 rotates in the direction that the front bracket 1 moves closer, the rear of the front link 12 moves upward, thus driving The second shaft 131 slides up along the first chute 14 ; at the same time, due to the limiting effect of the first through hole 112 , the first sliding sleeve 11 is driven to slide up by the second shaft 131 , which plays the role of lifting the wheel. The second axis 131 can be located above or below the first axis 15. In this example, the second axis 131 is located above the first axis 15. The distance between one axis 15) becomes longer.

As shown in FIG. 6 , the first sliding sleeve 11 is provided with a third sliding groove 111 , the first shaft 15 passes through the third sliding groove 111 , and the third sliding groove 111 is on a plane parallel to the length direction of the front bracket 1 . The projected length is greater than or equal to the length of the first chute 14; or/and, the second sliding sleeve 21 is provided with a fourth chute 211, the fourth shaft 25 passes through the fourth chute 211, and the fourth chute 211 is in The projected length on a plane parallel to the longitudinal direction of the rear bracket 2 is greater than or equal to the length of the second chute 24 , see FIG. 3 . Preferably, the first through hole 112 is located above the third sliding slot 111 , and the second through hole 212 is located above the fourth sliding slot 211 .

In an embodiment of the present invention, the third chute 111 is a spiral slot, and the fourth chute 211 can also be a spiral slot. Correspondingly, the first through hole 112 has a shape that matches the third chute 111 , that is, When the first shaft 15 moves in the third chute 111 , the second shaft 131 can move correspondingly in the first through hole 112 , and/or the second through hole 212 has a shape matching with the fourth chute 211 That is, when the fourth shaft 25 moves in the fourth chute 211 , the fifth shaft 231 can move correspondingly in the second through hole 212 . The arrangement of the helical groove makes the length of the first sliding sleeve 11 and the second sliding sleeve 21 longer than that of the first sliding sleeve 11 and the second sliding sleeve 21 in the case of the straight groove, so that the first sliding sleeve 11 is opposite to the front There are many covering parts of the bracket 1 and the second sliding sleeve 21 covering the rear bracket 2 , so that the sliding of the first sliding sleeve 11 and the second sliding sleeve 21 is smoother and more stable. In addition, the spiral groove-type third chute 111 and the fourth chute 211 face the lower part of the cart respectively when the cart is unfolded, that is, they are in a position that is not easy to be observed, thus improving to a certain extent Aesthetics.

In addition, the third sliding groove 111 of the spiral groove type is arranged on the first sliding sleeve 11, and the fourth sliding groove 211 of the spiral groove type is arranged on the second sliding sleeve 21 and has the following functions: the front wheel assembly 7 includes the front wheel joint and the The front wheel joint is rotatably connected to the front wheel, and the rear wheel assembly 8 includes a rear wheel joint and a rear wheel rotatably connected to the rear wheel joint, and the axles of the front wheel and the rear wheel can be steered. When the frame changes from the open state to the folded state, since the third chute 111 and the front link 12 slide with each other, the fourth chute 211 and the rear link 22 slide with each other, under the guidance of the spiral groove, the first A sliding sleeve 11 rotates on the front bracket 1, thereby driving the front wheel assembly 7 to rotate; the second sliding sleeve 21 rotates on the rear bracket 2, thereby driving the rear wheel assembly 8 to rotate. In one embodiment, when the cart rotates After the folding is completed, the front wheel assembly 7 and the rear wheel assembly 8 are turned over until the axles extend in the front-rear direction, that is, the front and rear wheels are close to and roughly parallel to the vertical plane. bump.

As mentioned above, "the front connecting rod 12, the front connecting piece 13 and the front bracket 1 form a similar triangle", this triangle makes the first sliding sleeve 11 drive the front wheel assembly 7 to lift up when the cart is folded, and at the same time the first axle 15 slides down relative to the first sliding sleeve 11, and the function of the spiral groove is to limit the position. The first shaft 15 slides and rotates relative to the first sliding sleeve 11, then taking the frame as the reference frame, in fact, the first sliding sleeve 11 moves towards the position. The inner side rotates, correspondingly, the front wheel assembly 7 is turned inward; the first through hole 112 also leaves a space for the movement of the second shaft 131 when the first sliding sleeve 11 rotates, so that the wheel can be lifted up and turned inward. , but in the preferred solution provided in this embodiment, the first through hole 112 spirally extends for a certain length along the outer surface of the first sliding sleeve 11 , and only the second shaft 131 is left in the length direction of the first sliding groove 14 along the outer surface of the first sliding sleeve 11 . The necessary space for sliding of the first sliding groove 14 in the width direction hardly allows the second shaft 131 to slide in the length direction of the first sliding groove 14 in the first through hole 112 . The post linkage mechanism is the same, and will not be repeated here.

The rear part of the front link 12 and the front part of the rear link 22 can be rotatably connected through the seventh shaft 121, and the foldable cart also includes a push rod 4 and an upper link 5, and the push rod 4 is connected to the upper bracket 3 through the eighth shaft. The upper part of the upper link 5 is rotatably connected with the lower part of the push rod 4 through the upper connecting piece. Referring to FIG. 1 and FIG. 4, the rotation axis between the upper connecting piece and the push rod 4 in this embodiment is The line is coaxially arranged with the eighth axis, the lower part of the upper link 5 is rotatably connected with the double sliding sleeve 51, and the double sliding sleeve 51 is slidably sleeved on the rear connecting rod 22; the double sliding sleeve 51 is located in the rear connection In front of the member 23 , the double-link in the double-link sliding sleeve 51 means that it is not only connected with the lower part of the upper link 5 , but also connected with the rear connecting member 23 through the sixth shaft 232 . When the frame changes from the open state to the folded state, as shown in Figures 4 and 5, the upper bracket 3 rotates and moves closer to the rear bracket 2, the push rod 4 rotates in the opposite direction to the upper bracket 3, and the push rod 4 drives the upper link The rotation of the rod 5 makes the double sliding sleeve 51 slide from the rear to the front along the rear link 22 , wherein the rear bracket 2 , the push rod 4 , the upper bracket 3 and the upper link 5 constitute a four-link.

The foldable cart of this embodiment has a purely mechanical structure, is energy-saving and environmentally friendly, does not require the trouble of charging and replacing batteries, and is lighter than a cart with a motor installed.

Preferably, the upper link 5 is rotatably connected to the rear bracket 2 through the tenth shaft. With this setting, the user can fold the cart with one hand: turn the push rod 4 forward, drive the upper link 5 to rotate, and then push the double sliding sleeve 51 to move backward, and the front link 12 and the rear link 22 rotate Correspondingly, the position of the front connecting piece 13 and the rear connecting piece 23 changes so that the similar triangles formed by them are changed as described above, so that the entire frame can be folded; especially the cart in this embodiment is only Folding in the front-rear direction, but not in the left-right direction, parents can hold the child in one hand and fold the stroller easily with the other hand, and carry it with them. In particular, the upper link 5 is set as a bending structure with an obtuse angle as shown in FIG. 3 , which further facilitates the user to apply force to it through the push rod 4 and improves the convenience of the folding operation. In order to prevent the cart from being folded during normal use, a locking mechanism can be set. When the locking mechanism is in a locked state, the upper link 5 and the double sliding sleeve 51, the front link 12 and the rear link 22, the front link 5 and the double sliding sleeve 51, the front link 12 and the rear link 22, The connector 13 and the front link 12 , the front connector 13 and the front bracket 1 , the rear connector 23 and the rear link 22 , and the rear connector 23 and the rear bracket 2 cannot mutually rotate.

When the frame is in the folded state, as shown in FIG. 7 in this embodiment, the rotation axes of the upper bracket 3 and the rear bracket 2 are located in front of the rotation axes of the front bracket 1 and the rear bracket 2 , and the two are approximately Located at the same height; and because the above-mentioned two rotation axis lines have a distance in the front-rear direction, within this distance, the upper link 5 can be included, and the lower part of the upper link 5 is arranged on the outside of the rear bracket 2, and the upper part of the upper link 5 can be included. (through the upper connecting piece) is arranged on the inner side of the upper bracket 3, therefore, it can be clearly seen from Fig. 7 and Fig. 8 that when the cart is in the folded state, the part of the upper link 5 (especially its upper part in the figure) ) is accommodated between the upper bracket 3 and the rear bracket 2, so that the thickness of the folded cart in the front-rear direction is reduced; and the lower part of the front bracket 1 (the first sliding sleeve 11) is partially accommodated in the upper link The inside of the obtuse-angled bending structure further reduces the thickness of the cart in the front-rear direction in the folded state. Figure 1 shows that the lower end of the first sliding sleeve 11 has a protruding vertical structure. Therefore, during the folding process of the cart, the rotation of the first sliding sleeve 11 not only drives the front wheel assembly 7 to rotate, but also drives the protruding structure. The vertical structure of the trolley is rotated inward, compared to Figure 7, so that in the folded state, the original protruding vertical structure will not increase the thickness of the cart in the front and rear directions; on the other hand, the front wheel assembly 7 is usually configured as a universal Wheel structure, since the front wheel and rear wheel on the same side are close after folding, so even if the universal wheel rotates flexibly during the folding process, it will eventually be limited by the rear wheel (directional wheel) to keep it In the state shown in Figure 7 side by side with the rear wheels.

Preferably, the foldable cart also includes a seat plate 6 and a connecting rod 61 connected to the seat plate. In this embodiment, the seat plate 6 is a hard plate, which provides a left-right direction between the left bracket and the right bracket. Rigid connection, the seat plate 6 is rotatably connected with the front bracket 1 through the eleventh axis, the seat plate 6 is used to support the seat pocket or sleeping basket, and the seat pocket and sleeping basket are also foldable. The connecting rod connected to the seat plate The front part of 61 is rotatably connected with the seat plate 6, and the rear part of the connecting rod 61 connected with the seat plate is rotatably connected with the rear bracket 2. The frame actually contains a plurality of four-links, and the structure is exquisite. The connecting rod 61 connected with the seat plate, the front bracket 1 and the rear bracket 2 form one of the four-links, and the rear bracket 2, the upper bracket 3, the push rod 4 and the upper link 5 form the other four-link; When the open state changes to the folded state, the upper bracket 3 rotates to move toward the rear bracket 2 , the seat plate 6 rotates toward the front bracket 1 , and the rotation direction of the seat plate 6 is opposite to the rotation direction of the upper bracket 3 . The seat plate 6 can be designed to have a structure with multiple through holes, which not only reduces the weight of the vehicle, but also improves the air permeability of the seat pocket.

Referring to FIGS. 7 and 9 , there are avoidance holes on the left and right sides of the seat plate 6 . During the folding process, the rear of the front link 12 and the front of the rear link 22 are rotated, see FIGS. 5 and 6 , until the folded state, the front part of the rear link 22 is at least partially accommodated in the avoidance hole of the seat plate 6, further reducing the thickness of the folded cart; and referring to FIG. 9, the seat plate 6 is designed to be irregular Square, but the left and right sides of the front end of the seat plate 6 are designed to be narrowed structures to avoid protruding parts on other rods, such as parts sleeved on the first sliding sleeve 11 on the front bracket 1 .

7 and 8, the height of the lower end of the folded upper link 5 is close to the height of the bottom of the wheel, so that the folded cart can stand stably on the ground; the height of the upper end of the push rod 4 or the rear bracket 2 It is close to the height of the upper edge of the seat plate 6, so that in the folded state of the cart, there is no special protrusion of individual rods, and the whole is relatively small.

The first sliding sleeve 11 and the second sliding sleeve 21 are preferably made of plastic, which further reduces the weight of the cart and is convenient to carry and operate with one hand.

In one embodiment of the present invention, the front wheel assembly 7 and the rear wheel assembly 8 of the folded cart contact the ground, which is not only flat but also enables the folded cart to stand on the ground without leaning against the wall. At least one of the rod 4 and the upper link 5 contacts the ground, which facilitates placement and improves the stability of standing on the ground.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection of the present invention. within the range.

Claims

A foldable cart, comprising an openable and foldable frame, a front wheel assembly (7) and a rear wheel assembly (8) connected at the bottom of the frame, and the frame includes a left A side bracket, a right bracket located on the right side, the left bracket and the right bracket respectively comprise: an upper bracket (3), a front bracket (1) whose bottom is connected to the front wheel assembly (7), a bottom bracket Connect the rear bracket (2) of the rear wheel assembly (8), any two of the upper bracket (3), the front bracket (1), and the rear bracket (2) are rotatably connected to each other, and the other one is connected to the rear bracket (2). At least one of the two is rotatably connected, and when the vehicle frame is in an open state, the upper bracket (3), the front bracket (1), and the rear bracket (2) are relatively unfolded, and when the vehicle When the frame is in the folded state, the upper frame (3), the front frame (1), and the rear frame (2) are close to each other, and are characterized in that:

A front linkage mechanism is arranged between the front bracket (1) and the front wheel assembly (7), or/and a rear linkage is arranged between the rear bracket (2) and the rear wheel assembly (8). mechanism;

When the frame changes from the open state to the folded state, the front linkage mechanism drives the front wheel assembly (7) to move upward along the length of the front bracket (1), or/and, The rear linkage mechanism drives the rear wheel assembly (8) to move upward along the length direction of the rear bracket (2).
The foldable cart according to claim 1, wherein the left bracket and the right bracket further comprise:

A push rod (4), the lower part of the push rod (4) is rotatably connected with the upper part of the upper bracket (3),

an upper link (5), the upper part of the upper link (5) is rotatably connected with the lower part of the push rod (4), and the upper link (5) is rotatably connected with the rear bracket (2);

A front link (12), the front link (12) extends in the front-rear direction in the open state of the frame, and the front part of the front link (12) is rotatably connected with the front bracket (1) ;

A rear link (22), the rear link (22) extends in the front-rear direction in the open state of the frame, the front part of the rear link (22) and the front link (12) The rear part is rotatably connected, and the rear part of the rear connecting rod (22) is rotatably connected with the rear bracket (2);

A sliding member, the sliding member is slidably connected with the rear link (22) along the lengthwise extending direction of the rear link (22), and the lower portion of the upper link (5) is connected with the sliding member.
The foldable cart according to claim 2, wherein the sliding member is a double sliding sleeve (51), and the double sliding sleeve (51) is sleeved on the rear link (22) , the lower part of the upper link (5) is rotatably connected with the double sliding sleeve (51).
The foldable cart according to claim 2, wherein the front wheel assembly (7) comprises a front wheel joint and a front wheel rotatably connected with the front wheel joint, and the front wheel joint is connected to the front wheel joint. The bracket (1) is slidably connected through the front linkage mechanism.
The foldable cart according to claim 2, wherein the rear wheel assembly (8) comprises a rear wheel joint and a rear wheel rotatably connected with the rear wheel joint, and the rear wheel joint is connected to the rear wheel joint. The bracket (2) is slidably connected through the rear linkage mechanism.
The foldable cart according to claim 4, wherein:

The front wheel joint is sleeved on the front bracket (1), the front wheel joint is provided with a first through hole (112), and the front bracket (1) is provided with along the front bracket (1). ) a first chute (14) extending in the length direction, and the front linkage mechanism includes:

A front connector (13), the first end of the front connector (13) is connected with the front bracket (1) and the front wheel joint through a second shaft (131), and the second shaft ( 131) Passing through the first through hole (112) and being able to slide in the first chute (14), the second end of the front connecting piece (13) is connected to the first through-hole (132) through the third shaft (132). The front connecting rod (12) is rotatably connected;

When the frame transitions from the open state to the folded state, the front link (12) moves closer to the front bracket (1), and the second shaft (131) slides on the first slide. The upward sliding in the groove (14) drives the front wheel assembly to slide upward.
The foldable cart according to claim 5, wherein:

The rear wheel joint is sleeved on the rear bracket (2), the rear wheel joint is provided with a second through hole (212), and the rear bracket (2) is provided with an edge along the rear bracket (2). ) a second chute (24) extending in the length direction, and the rear linkage mechanism includes:

A rear connector (23), the first end of the rear connector (23) is connected with the rear bracket (2) and the rear wheel joint through a fifth shaft (231), and the fifth shaft ( 231) Passing through the second through hole (212) and being able to slide in the second chute (24), the second end of the rear connecting piece (23) is connected to the second through-hole (232) through the sixth shaft (232). The rear connecting rod (22) is rotatably connected;

When the frame transitions from the open state to the folded state, the rear link (22) moves closer to the rear bracket (2), and the fifth shaft (231) slides on the second slide. The upward sliding in the groove (24) drives the rear wheel (8) to slide upward.
The foldable cart according to claim 6 or 7, characterized in that the foldable cart comprises the front linkage mechanism and the rear linkage mechanism, and a third slide is provided on the front bracket (1). A groove (111), the front link (12) is rotatably connected to the front bracket (1) through the third chute (111), and the rear bracket (2) is provided with a fourth chute ( 211), the rear connecting rod (22) is rotatably connected to the rear bracket (2) through the fourth chute (211).
The foldable cart according to claim 8, wherein the third chute (111) is located below the first through hole (112), or the fourth chute (211) is located in below the second through hole (212).
The foldable cart according to claim 8, wherein the projected length of the third chute (111) on a plane parallel to the length direction of the front bracket (1) is greater than or equal to the The length of the first chute (14), or the projected length of the fourth chute (211) on a plane parallel to the length direction of the rear bracket (2) is greater than or equal to the second chute (24) length.
The foldable cart according to claim 2, wherein the frame further comprises a front wheel turning mechanism and a rear wheel turning mechanism, and when the frame is in the open state, the front wheel assembly ( 7) The axis line of the front wheel and the axis line of the rear wheel of the rear wheel assembly (8) both extend in the left-right direction. When the frame changes from the open state to the folded state, all the The front wheel turning mechanism drives the front wheel to turn over and makes the axis line of the front wheel have a tendency to turn and extend in the front-rear direction, and the rear wheel turning mechanism drives the rear wheel to turn over and makes the axis of the rear wheel turn. The center line has a tendency to turn to extend in the front-rear direction.
The foldable cart according to claim 11, wherein the front wheel turning mechanism comprises a first sliding sleeve (11) and a third sliding groove (111) provided on the first sliding sleeve (11). ), the rear wheel turning mechanism includes a second sliding sleeve (21) and a fourth sliding groove (211) provided on the second sliding sleeve (21), the first sliding sleeve (11) slidingly covers the ground It is arranged on the front bracket (1), and the lower end of the first sliding sleeve (11) is connected with the front wheel assembly (7); the second sliding sleeve (21) is slidably sleeved on the rear bracket (2) and the lower end of the second sliding sleeve (21) is connected to the rear wheel assembly (8);

The third chute (111) and the fourth chute (211) are both spiral groove structures;

When the frame transitions from the open state to the folded state, the front link (12) slides along the third chute (111), so that the first sliding sleeve (11) drives the The front wheel assembly (7) rotates; the rear connecting rod (22) slides along the fourth chute (211), so that the second sliding sleeve (11) drives the rear wheel assembly (8) turn.
The foldable cart according to claim 12, characterized in that, a first through hole (112) is opened in the circumferential direction of the first sliding sleeve (11), and a flange is opened on the front bracket (1) a first chute (14) extending in the length direction of the front bracket (1);

The second sliding sleeve (21) is provided with a second through hole (212), and the rear bracket (2) is provided with a second chute (24) extending along the length direction of the rear bracket (2);

The first through hole (112) extends for a certain length along the circumferential direction of the first sliding sleeve (11), and the second through hole (212) extends for a certain length along the circumferential direction of the second sliding sleeve (21), And the projected length of the first through hole (112) on a plane parallel to the width direction of the first chute (14) is greater than or equal to the length of the third chute (111) on a plane parallel to the first chute (14). The projected length of the chute (14) on a plane parallel to the width direction; the projected length of the second through hole (212) on a plane parallel to the width direction of the second chute (24) is greater than or It is equal to the projected length of the fourth chute (211) on a plane parallel to the width direction of the second chute (24).
The foldable cart according to claim 13, wherein the projected length of the third chute (111) on a plane parallel to the length direction of the front bracket (1) is greater than or equal to the The length of the first chute (14), the projected length of the fourth chute (211) on a plane parallel to the length direction of the rear bracket (2) is greater than or equal to the second chute (24) )length.
The foldable cart according to claim 13, wherein the third chute (111) is located below the first through hole (112), and the fourth chute (211) is located in the below the second through hole (212).
The foldable cart according to claim 1, wherein the left bracket and the right bracket further comprise:

A push rod (4), the lower part of the push rod (4) is rotatably connected with the upper part of the upper bracket (3),

an upper link (5), the upper part of the upper link (5) is rotatably connected with the lower part of the push rod (4), and the upper link (5) is rotatably connected with the rear bracket (2);

When the frame is in the folded state, the upper link (5) is at least partially accommodated between the upper bracket (3) and the rear bracket (2), and/or the front bracket (1) is at least partially accommodated in Inside of the upper link (5).
The foldable cart according to claim 1, wherein the left bracket and the right bracket further comprise:

A push rod (4), the lower part of the push rod (4) is rotatably connected with the upper part of the upper bracket (3),

an upper link (5), the upper part of the upper link (5) is rotatably connected with the lower part of the push rod (4), and the upper link (5) is rotatably connected with the rear bracket (2); The lower part of the upper link (5) is arranged on the outer side of the rear bracket (2), and the upper part is arranged on the inner side of the upper bracket (3) through the upper connecting piece; when the frame is in the folded state, all The rotation axes of the upper bracket (3) and the rear bracket (2) are located in front of the rotation axes of the front bracket (1) and the rear bracket (2), and the two rotation axes are approximately at the same height.