TWM650994U - Trolley - Google Patents

Abstract

The present invention discloses a trolley. The trolley includes a main bracket, a connecting mechanism, an upper bracket, a sliding mechanism, at least one first connecting rod, at least one second connecting rod, at least one third connecting rod, at least one rear wheel and at least one fourth connecting rod. The main bracket has a first end and a second end. The connecting mechanism is arranged at the first end. The upper bracket is connected to the first end through the connecting mechanism. The sliding mechanism is slidably arranged on the main bracket. Both ends of the first connecting rod are respectively connected to the sliding mechanism and the upper bracket. The second connecting rod is disposed parallel to the third connecting rod, one ends of the second connecting rod and the third connecting rod are respectively connected to the sliding mechanism, and the other ends of the second connecting rod and the third connecting rod are respectively connected to the rear wheel. The fourth connecting rod has a third end, a fourth end and a bending portion, the third end is connected to the second connecting rod, and is located between the sliding mechanism and the rear wheel, and the fourth end is connected to the connecting mechanism.

Description

trolley

The present invention relates to a trolley, in particular to a trolley that can reduce the amount of packaging volume.

Small wheeled carts, such as golf carts, strollers, shopping carts, or other types of carts, can provide considerable convenience for people's travel, daily leisure, shopping, or entertainment applications. If the trolley has a folding function, it can be folded up when not in use for easy transportation or storage.

However, although the existing trolleys can provide people with some convenience in use, when they are not in use and need to be stored, the folding process is quite complicated, and they also occupy too much space after folding, which increases the amount of packaging volume. Not conducive to transportation or storage.

Therefore, how to provide a trolley that can simplify the folding process and does not occupy too much space after folding, thereby reducing the amount of packaging volume, is one of the topics that the industry attaches great importance to.

In view of the above issues, the purpose of the present invention is to provide a trolley that not only simplifies the folding process, but also has a smaller overall size in the folded state, which can reduce the amount of packaging material used.

In order to achieve the above purpose, the present invention proposes a trolley, which includes a main bracket, a connecting mechanism, an upper bracket, a sliding mechanism, at least a first link, at least a second link, at least a third link, and at least One rear wheel and at least one fourth link. The main bracket has a first end and a second end. The connecting mechanism is arranged at the first end of the main bracket. The upper bracket is connected to the first end of the main bracket through a connecting mechanism. The sliding mechanism is slidably disposed on the main bracket. Both ends of the first connecting rod are connected to the sliding mechanism and the upper support respectively. shelf. The second link and the third link are arranged in parallel, one ends of the second link and the third link are respectively connected to the sliding mechanism, and the other ends of the second link and the third link are connected to the rear wheel respectively. The fourth connecting rod has a third end, a fourth end and a bending part. The third end is connected to the second connecting rod and is located between the sliding mechanism and the rear wheel, and the fourth end is connected to the connecting mechanism.

In one embodiment, the second link includes a protruding portion, and the third end is connected to the protruding portion.

In one embodiment, the trolley further includes an elastic mechanism, which is disposed in the main bracket and connected to the sliding mechanism.

In one embodiment, the elastic mechanism includes at least one elastic member, the elastic member has an extension portion, and the extension portion is connected to the sliding mechanism.

In one embodiment, when the sliding mechanism slides on the main bracket, the extension moves with the sliding mechanism.

In one embodiment, the second link has a notch, and the distance between the notch and the sliding mechanism is smaller than the distance between the notch and the rear wheel.

In one embodiment, the distance between the bending part and the fourth end is smaller than the distance between the bending part and the third end.

In one embodiment, the trolley further includes a front wheel, which is arranged at the second end of the main frame; wherein, when the trolley is in a folded state, the front wheel and the rear wheel are both facing the same direction, and the direction is substantially the same as the extension direction of the main frame. Parallel to the top.

In one embodiment, in the folded state, the main bracket and the second link are substantially parallel.

In one embodiment, in the folded state, the overall width of the trolley is less than or equal to 3.5 times the width of the front or rear wheels.

In one embodiment, the trolley further includes a push handle bracket, an upper carrying frame and a lower carrying frame. The push handle bracket is connected to an end of the upper bracket away from the main bracket. The upper bearing frame is arranged on the side of the upper bracket away from the main bracket. The lower bearing frame is arranged at the second end of the main bracket.

In one embodiment, when the trolley is in the folded state, the upper carrying frame is located on both sides of the front wheel, and the lower carrying frame is fixed to the upper bracket.

Based on the above, in the new type of trolley, the sliding mechanism is slidably installed on the main bracket; the two ends of the first connecting rod are connected to the sliding mechanism and the upper bracket respectively; the second connecting rod and the third connecting rod Arranged in parallel, one end of the second link and the third link are respectively connected to the sliding mechanism, the other ends of the second link and the third link are respectively connected to the rear wheel; and the third end of the fourth link is connected to the third link. The second link is located between the sliding mechanism and the rear wheel, and the fourth end is connected to the structural design of the connecting mechanism, so that the sliding mechanism slides on the main bracket to make the second link, the third link and the fourth link When the rear wheel is linked to move in the direction of the connecting mechanism, there will be no structural interference between the fourth link and the connecting mechanism. At the same time, in the folded state, the rear wheel can approach and get closer to the first end of the main bracket. In this way, in addition to simplifying the folding process, the trolley of the present invention also has a smaller overall size in the folded state, thereby reducing the amount of packaging material used.

1: Trolley

11: Main bracket

111:Slide rail

12:Connection mechanism

13: Upper bracket

14:Sliding mechanism

15a: First connecting rod

15b: Second connecting rod

15c:Third connecting rod

15d:Fourth connecting rod

151: Bending part

152:Protrusion

153: Gap

16:Rear wheel

17: Elastic parts

171:Extension

18:Front wheel

181:Front wheel bracket

19: Push handle bracket

191:Adjustment parts

20a: Upper bearing frame

20b: Lower bearing frame

20c: Bearing seat

D1: first direction

D2: second direction

D3: Third direction

E1: first end

E2: Second end

E3: Third end

E4: fourth end

S1: Operation status (expanded status)

S2: folded state

W, w: width

1A to 1D are schematic views of a trolley from different angles according to an embodiment of the present invention.

Figures 2A to 2F are respectively schematic diagrams of the folding process of the hand stacking cart shown in Figure 1A.

Figure 3 is a schematic diagram of the trolley in Figure 2E from another perspective.

The trolley according to the new embodiment of the present invention will be described below with reference to the relevant drawings, in which the same components will be described with the same reference symbols. The components appearing in the drawings of the following embodiments are only used to illustrate their relative relationships and do not represent the proportions or sizes of the actual components.

Figures 1A to 1D are schematic views of a hand truck according to an embodiment of the present invention from different angles. Figures 2A to 2F are schematic views of the folding process of the hand stacking car in Figure 1A. Figure 3 is another view of the hand truck in Figure 2E. Perspective diagram. For clarity of explanation, FIG. 2B only shows a partial cross-sectional view of FIG. 2A , FIG. 2D only shows a partial cross-sectional view of FIG. 2C , and FIG. 2F only shows a partial cross-sectional view of FIG. 2E . In addition, FIGS. 1A to 1D are respectively schematic diagrams of the trolley 1 in the operating state (expanded state) S1 of this embodiment, and FIGS. 2E and 3 are respectively schematic diagrams of the trolley 1 in the folded state S2 . In addition, "connection" in this article includes "relatively movable connection" and "relatively immovable connection". Among them, "relatively movable connection" can be, for example, a connection, that is, one object is fixed but another object can rotate relative to the object, while "relatively movable connection" can be, for example, a fixed connection, that is, two objects cannot move relative to each other.

The new type of trolley is a foldable trolley with wheels, for example but not limited to Golf carts, strollers, shopping carts, or other foldable carts with wheels. The trolley 1 of this embodiment is a golf equipment trolley as an example. The detailed structure of the trolley 1 of this embodiment will first be described below, and its folding and unfolding processes will be described later.

Please refer to FIGS. 1A to 1D . The trolley 1 includes a main bracket 11 , a connecting mechanism 12 , an upper bracket 13 , a sliding mechanism 14 , at least a first link 15 a , at least a second link 15 b , and at least a second link 15 b . Three links 15c, at least one rear wheel 16 and at least one fourth link 15d. In this embodiment, the first link 15a, the second link 15b, the third link 15c and the fourth link 15d are respectively two as an example, and the number of the rear wheels 16 is also two. In addition, the trolley 1 of this embodiment also includes an elastic mechanism, a front wheel 18, a push handle bracket 19, an upper bearing frame 20a and a lower bearing frame 20b.

The main bracket 11 has a first end E1 and a second end E2, and the connecting mechanism 12 is disposed on the first end E1 of the main bracket 11 . Here, the connecting mechanism 12 is used to enable the first end E1 of the main bracket 11 to connect to other components, and for example, to be locked or embedded in the first end E1 of the main bracket 11 .

The upper bracket 13 is connected to the first end E1 of the main bracket 11 through the connecting mechanism 12 . In this embodiment, the upper bracket 13 is pivotally connected to the main bracket 11 through the connecting mechanism 12 . Therefore, the upper bracket 13 can be folded relative to the main bracket 11 through the connecting mechanism 12 .

The sliding mechanism 14 includes, for example, a sliding block, which is slidably disposed on the main bracket 11 . It can be understood that the main bracket 11 needs to have a slide rail 111 corresponding to the sliding mechanism 14 so that the sliding mechanism 14 can slide on the main bracket 11 .

Both ends of the first link 15a are connected to the sliding mechanism 14 and the upper bracket 13 respectively. Here, the two ends of the two first connecting rods 15a can be connected to the sliding mechanism 14 and the upper bracket 13 respectively through screw locking, for example. Therefore, when the sliding mechanism 14 slides on the main bracket 11, it can simultaneously drive the upper bracket 13 to fold relative to the main bracket 11 through the first link 15a.

The second link 15b and the third link 15c are arranged in parallel. One end of the second link 15b and one end of the third link 15c are respectively connected to the sliding mechanism 14, and the other end of the second link 15b and the other end of the third link 15c are respectively connected to the rear wheel 16. In this embodiment, one end of each second link 15b is connected to the sliding mechanism 14, and the other end is connected to the rear wheel 16. Similarly, one end of each third link 15c is also connected to the sliding mechanism 14. , the other end of which is also connected to the rear wheel 16. Here, the second link 15b, the third link 15c, the second link 15b and the third link 15c are connected with the internal parts of the sliding mechanism 14. The connecting structure, as well as the internal connecting structure of the second link 15b, the third link 15c and the rear wheel 16 can form a parallel four-link structure. Therefore, when the sliding mechanism 14 slides on the main bracket 11, the two second connecting rods 15b and the two third connecting rods 15c can simultaneously drive the two rear wheels 16 to move relative to the main bracket 11, and simultaneously make the two rear wheels 16 move relative to the main bracket 11. The wheel 16 approaches the first end E1 of the upper bracket 13 and moves closer to the upper bracket 13 . In addition, each second link 15b in this embodiment has a notch 153, and the notch 153 is adjacent to the connection between the corresponding third link 15c and the sliding mechanism 14. Here, the distance between the notch 153 and the sliding mechanism 14 is smaller than the distance between the notch 153 and the rear wheel 16 . The notch 153 can be used to allow each second link 15b to avoid the corresponding third link 15c and the sliding mechanism 14 during the folding process. to avoid structural interference between the connection between the third link 15c and the sliding mechanism 14 and the second link 15b.

The fourth link 15d has a third end E3, a fourth end E4 and a bent portion 151. The third end E3 is connected to the second link 15b and is located between the sliding mechanism 14 and the rear wheel 16, and the third end E3 is connected to the second link 15b. The four terminals E4 are connected to the connection mechanism 12 . In this embodiment, the bent portion 151 is adjacent to the fourth end E4 and the connecting mechanism 12 , that is, the distance between the bent portion 151 and the fourth end E4 is smaller than the distance between the bent portion 151 and the third end E3 . In addition, each second link 15b includes a protruding portion 152, and the third end E3 of each fourth link 15d is connected to the corresponding protruding portion 152. In this embodiment, the protruding portion 152 is connected to the main body of the second link 15b in a locking manner, but it is not limited thereto. In different embodiments, the protruding portion 152 can also be connected to the main body of the second link 15b. It is a one-piece structure. It should be reminded again that the two first links 15a, the two second links 15b, the two third links 15c, the two fourth links 15d and the two rear wheels 16 in the trolley 1 of this embodiment There are symmetrical structures on opposite sides of the main bracket 11 .

The front wheel 18 is provided at the second end E2 of the main bracket 11 . Here, the front wheel 18 is connected to the second end E2 of the main bracket 11 through the front wheel bracket 181 . In addition, the push handle bracket 19 is connected to an end of the upper bracket 13 away from the main bracket 11 . The trolley 1 of this embodiment may further include an adjusting member 191 , which is disposed at the connection between the push handle bracket 19 and the upper bracket 13 , whereby the folding of the push handle bracket 19 and the main bracket 11 can be controlled through the adjusting member 191 . In some embodiments, the adjustment member 191 may include a handle, a spring, and a convex-concave structure (not shown). By loosening the adjusting member 191, the push handle bracket 19 can be folded relative to the upper bracket 13. When the adjusting member 191 is fastened, the relative position of the push handle bracket 19 and the main bracket 11 can be fixed.

The upper carrying frame 20a is disposed on the side of the upper bracket 13 away from the main bracket 11 . Here, the upper carrying frame 20a is adjacent to the connection between the upper bracket 13 and the push handle bracket 19; while the lower carrying frame 20b is arranged on the main The second end E2 of the bracket 11. In addition, in order to fix objects (such as golf bags) placed on the trolley 1 so that the objects will not fall when the trolley 1 moves, the trolley 1 of this embodiment may further include a carrying base 20c, and the carrying base 20c is provided At the second end E2 of the main bracket 11. Therefore, when placing an object on the trolley 1, the carrying seat 20c can be used to carry the object, and the upper carrying frame 20a and the lower carrying frame 20b can be used to fix the object on the upper and lower sides of the object to prevent it from falling during movement. In some embodiments, the expansion width of the upper carrying frame 20a and/or the lower carrying frame 20b can be adjusted to be suitable for fixing objects of different widths.

In addition, please first refer to FIG. 2B and FIG. 2D , the elastic mechanism is provided in the main bracket 11 , and the elastic mechanism is connected to the sliding mechanism 14 . The elastic mechanism of this embodiment includes at least one elastic member 17 . The elastic member 17 has an extension part 171 , and the extension part 171 is connected to the sliding mechanism 14 . Therefore, when the sliding mechanism 14 slides on the main bracket 11 , the extension portion 171 also extends from the elastic member 17 and moves with the sliding mechanism 14 . The elastic member 17 of this embodiment is for example but not limited to a coil spring. When the extension part 171 of the coil spring (elastic member 17) is driven by the sliding mechanism 14 and extends from the coil spring, the coil spring (elastic member 17) will generate an elastic force. Restoring force, this elastic restoring force can provide the user with automatic restoring force when unfolding the trolley 1. Here, three elastic members 17 (coil springs) are arranged side by side, and the three extending portions 171 of the three elastic members 17 (coil springs) are overlapped, and the three extending portions 171 are all connected to the sliding mechanism 14 . Therefore, when the sliding mechanism 14 slides on the main bracket 11, it can simultaneously drive the extension portions 171 of the three elastic members 17 to extend outward, thereby providing elastic restoring force through the three elastic members 17. The aforementioned elastic mechanism including three elastic members 17 (coil springs) is just an example. In different embodiments, the number of elastic members 17 (coil springs) may be less than or more than three.

Below, please refer to FIGS. 1A to 1D in conjunction with FIGS. 2A to 2F to illustrate the quick folding method of the trolley 1 of this embodiment.

The quick folding method of the trolley 1 in this embodiment may include steps one to three.

As shown in FIGS. 2A and 2B , first, step 1 is: release the push handle bracket 19 and fold the push handle bracket 19 relative to the upper bracket 13 along a first direction D1 so that the push handle bracket 19 is located on the main bracket 11 one side. In this embodiment, by loosening the adjusting member 191, the push handle bracket 19 can be folded relative to the upper bracket 13 along the first direction D1, so that the push handle bracket 19 is located on the lower side of the main bracket 11, so that the push handle bracket 19 be substantially parallel to the main bracket 11 , and then the adjusting member 191 can be fastened to fix the relative position of the push handle bracket 19 and the main bracket 11 . In step one, other parts do not move.

Next, as shown in FIGS. 2C and 2D , the second step is to fold the upper bracket 13 relative to the main bracket 11 along a second direction D2 so that the sliding mechanism 14 slides on the main bracket 11 through the first link 15 a, and then Through the second link 15b, the third link 15c and the fourth link 15d, the rear wheel 16 is linked to move in the direction of the connecting mechanism 12 (the third direction D3) (that is, closer to the direction of the first end E1 of the main bracket 11 ). As mentioned above, since the two ends of each first link 15a in this embodiment are respectively connected to the sliding mechanism 14 and the upper bracket 13, one end of each second link 15b and one end of each third link 15c are respectively connected to The sliding mechanism 14, and the other end of each second link 15b and the other end of each third link 15c are respectively connected to each rear wheel 16. Therefore, when the sliding mechanism 14 slides on the main bracket 11, it can link the two The rear wheels 16 move toward the direction of the first end E1 of the main bracket 11 (the third direction D3) and get closer. Here, the aforementioned parallel four-link structure is used to keep the plane formed by each rear wheel 16 parallel to the extension direction of the main bracket 11 during the movement or completion of folding, thereby reducing the number of folded trolleys 1 the overall width.

Finally, as shown in FIGS. 2C to 2F , step 3 is performed: continue to fold the upper bracket 13 relative to the main bracket 11 along the second direction D2 until the lower carrier 20 b is fixed to the upper bracket 13 . As shown in FIG. 2E , in the folded state S2 , the upper carrying frame 20 a of the trolley 1 is located on both sides of the front wheel 18 , and the lower carrying frame 20 b can be fixed (locked) to the upper bracket 13 . In addition, the front wheel 18 and the two rear wheels 16 both face the same direction, and this direction is substantially parallel to the extension direction of the main bracket 11 . Specifically, in the folded state S2, the plane formed by the front wheels 18 and the plane formed by each rear wheel 16 are substantially parallel. Here, the plane formed by the front wheel 18 refers to the plane formed by the front wheel frame, and the plane formed by the rear wheel 16 refers to the plane formed by the rear wheel frame.

In addition, please refer to Figure 2F. In the folded state S2, the two fourth links 15d are located on the lower side of the main bracket 11, and the main bracket 11 and the second link 15b are substantially parallel. In addition, as shown in Figure 3, in the folded state S2, the overall width W of the trolley 1 of this embodiment is less than or equal to 3.5 times the width w of the front wheel 18 or the rear wheel 16 (W≦3.5w).

Based on the above, in the trolley 1 of this embodiment, through the design of the fourth link 15d having the bending portion 151, the sliding mechanism 14 slides on the main bracket 11 so that the second link 15b, the third link 15c and When the fourth link 15d links the rear wheel 16 to move in the direction of the connecting mechanism 12, there will be no structural interference between the fourth link 15d and the connecting mechanism 12. At the same time, when the fourth link 15d is in the folded state S2 (Fig. 2E, Fig. 3) , the two rear wheels 16 can move closer to the direction of the first end E1 of the main bracket 11 at the same time, thereby increasing the overall size of the trolley 1 The size is smaller, which can reduce the amount of packaging space. It is worth mentioning that the existing trolleys of the same type have a packing volume of at least 2.5 meters in the folded state, but the trolley 1 of this embodiment has a packing volume of less than 1.7 meters in the folded state.

In addition, as mentioned above, since the distance between the notch 153 of each second link 15b and the sliding mechanism 14 is smaller than the distance between the notch 153 and the rear wheel 16, that is, the notch 153 of each second link 15b is close to each third link. 15c and the sliding mechanism 14, so it can avoid structural interference between the connection between the third link 15c and the sliding mechanism 14 and the second link 15b in the folded state S2.

In addition, other technical features of the quick folding method of the trolley 1 in this embodiment have been described in detail above and will not be described again here.

Following the above, in the trolley 1 of this embodiment, through the design of the bending portion 151, there will be no mechanical interference between the fourth link 15d and the connecting mechanism 12. At the same time, in the folded state S2, the two rear wheels 16 can At the same time, toward the extension direction of the main bracket 11, the trolley 1 has a smaller size in the folded state S2, thereby reducing the amount of packaging volume. In addition, this embodiment also uses the design of the notch 153 of the second link 15b to avoid structural interference between the connection between the third link 15c and the sliding mechanism 14 and the second link 15b during the folding process.

It should be mentioned again that when the trolley 1 of this embodiment is in the folded state S2 and returns to the operating state (expanded state) S1, the steps may be the reverse steps of the above-mentioned steps 1 to 3. Specifically, after first applying force to make the upper bracket 13 separate from the lower bearing frame 20b (that is, making the upper bracket 13 move in the opposite direction to the second direction D2), the elastic restoring force of the aforementioned elastic member 17 can be used to extend the The part 171 automatically rebounds into the elastic member 17. This process can link the sliding mechanism 14 to slide in the direction of the first end E1 of the main bracket 11, and then link the upper bracket 13 to move in the opposite direction of the second direction D2. At the same time, the The second link 15b, the third link 15c, the fourth link 15d and the rear wheel 16 respectively move in the opposite direction of the third direction D3, so that the trolley 1 automatically returns to the state in Figure 2A, and then the adjustment member 191 is released. , move the push handle bracket 19 relative to the upper bracket 13 in the opposite direction of the first direction D1, and then return the push handle bracket 19 to the position in the operating state (expanded state) S1 and then fasten the adjustment member 191, you can get as follows The trolley 1 in the operating state (deployment state) S1 shown in FIG. 1A can achieve the purpose of rapid deployment and labor saving.

From the above folding and unfolding process, it can be known that the trolley 1 of this embodiment can reach the folded state S2 through simple and quick folding steps in the operating state (expanded state) S1, and in the folded state Under S2, the elastic restoring force of the elastic member 17 is automatically expanded to reach the operating state (expanded state) S1. Therefore, in addition to the advantages of easy folding, unfolding and labor-saving, the trolley 1 of this embodiment also has a relatively small overall size after folding, which can reduce the amount of packaging material.

To sum up, in the new type of trolley, the sliding mechanism is slidably installed on the main bracket; the two ends of the first link are connected to the sliding mechanism and the upper bracket respectively; the second link and the third link are parallel It is configured that one end of the second link and the third link are respectively connected to the sliding mechanism, the other ends of the second link and the third link are respectively connected to the rear wheel; and the third end of the fourth link is connected to the second The connecting rod is located between the sliding mechanism and the rear wheel, and the fourth end is connected to the structural design of the connecting mechanism, so that the sliding mechanism slides on the main bracket to link the second connecting rod, the third connecting rod and the fourth connecting rod. When the rear wheel moves in the direction of the connecting mechanism, there will be no structural interference between the fourth link and the connecting mechanism. At the same time, in the folded state, the rear wheel can approach and get closer to the first end of the main bracket. In this way, in addition to simplifying the folding process, the trolley of the present invention also has a smaller overall size in the folded state, thereby reducing the amount of packaging material used.

The above is only illustrative and not restrictive. Any equivalent modifications or changes that do not depart from the spirit and scope of the present invention shall be included in the appended patent scope.

1: Trolley

11: Main bracket

111:Slide rail

12:Connection mechanism

13: Upper bracket

14:Sliding mechanism

15a: First connecting rod

15b: Second connecting rod

15c:Third connecting rod

15d:Fourth connecting rod

151: Bending part

152:Protrusion

153: Gap

16:Rear wheel

18:Front wheel

181:Front wheel bracket

19: Push handle bracket

191:Adjustment parts

20a: Upper bearing frame

20b: Lower bearing frame

20c: Bearing seat

E1: first end

E2: Second end

E3: Third end

E4: fourth end

S1: Operation state (expanded state)

Claims (12)

A trolley, including: a main bracket having a first end and a second end; a connecting mechanism provided at the first end of the main bracket; an upper bracket connected to the main bracket through the connecting mechanism The first end; a sliding mechanism slidably disposed on the main bracket; at least one first connecting rod, both ends of which are connected to the sliding mechanism and the upper bracket respectively; at least one second connecting rod, at least one third connecting rod; The connecting rod and at least one rear wheel; the second connecting rod and the third connecting rod are arranged in parallel, one ends of the second connecting rod and the third connecting rod are respectively connected to the sliding mechanism, and the second connecting rod and the third connecting rod are connected to the sliding mechanism. The other ends of the three connecting rods are respectively connected to the rear wheels; and at least one fourth connecting rod has a third end, a fourth end and a bending part, the third end is connected to the second connecting rod, and It is located between the sliding mechanism and the rear wheel, and the fourth end is connected to the connecting mechanism. The trolley of claim 1, wherein the second link includes a protruding portion, and the third end is connected to the protruding portion. The trolley according to claim 1 further includes: an elastic mechanism, which is arranged in the main bracket and connected with the sliding mechanism. The trolley of claim 3, wherein the elastic mechanism includes at least one elastic member, the elastic member has an extension portion, and the extension portion is connected to the sliding mechanism. The trolley of claim 4, wherein when the sliding mechanism slides on the main bracket, the extension moves with the sliding mechanism. The trolley of claim 1, wherein the second link has a notch, and the distance between the notch and the sliding mechanism is smaller than the distance between the notch and the rear wheel. The trolley of claim 1, wherein the distance between the bending part and the fourth end is less than the distance between the bending part and the third end. The trolley of claim 1, further comprising: a front wheel disposed at the second end of the main frame; wherein, when the trolley is in a folded state, the front wheel and the rear wheel both face the same direction, and the The direction is substantially parallel to the extension direction of the main bracket. The trolley of claim 8, wherein in the folded state, the main bracket and the second link are substantially parallel. The trolley as described in claim 8, wherein in the folded state, the overall width of the trolley is less than or equal to 3.5 times the width of the front wheel or the rear wheel. The trolley as described in claim 8 further includes: a push handle bracket connected to an end of the upper bracket away from the main bracket; an upper bearing frame disposed on a side of the upper bracket away from the main bracket; and a lower bearing bracket. The frame is arranged at the second end of the main bracket. The trolley according to claim 11, wherein when the trolley is in a folded state, the upper carrying frame is located on both sides of the front wheel, and the lower carrying frame is fixed to the upper bracket.