Trolley

Abstract

The present application discloses a trolley. The trolley comprises a front support frame assembly, a rear support frame assembly, a bottom frame assembly, and two side frame assemblies. The two side frame assemblies are located on two sides of the bottom frame assembly, respectively, and are spaced apart in the width direction of the bottom frame assembly. The front support frame assembly and the rear support frame assembly are located at two ends of the bottom frame assembly, respectively. The trolley has a folded state and an unfolded state. The trolley further comprises at least one limiting mechanism. At least one of the side frame assemblies is provided with the limiting mechanism. A first end of the limiting mechanism is hinged to the bottom frame assembly. In the unfolded state, the limiting mechanism is connected to the corresponding side frame assembly, and a supporting limit is formed between the bottom frame assembly and the side frame assembly, so as to limit the distance between the bottom frame assembly and the top side of the side frame assembly to be within a set range. In the folded state, the bottom frame assembly is located between the two opposite side frame assemblies.

Description

A type of cart

[0001] Cross-reference to related applications

[0002] This application claims priority to Chinese Patent Application No. 202423294580.8, entitled "A Trolley", filed on December 31, 2024, the entire contents of which are incorporated herein by reference. Technical Field

[0003] This application relates to the field of outdoor recreational equipment, and more specifically, to a trolley. Background Technology

[0004] A trolley is a common outdoor recreational piece of equipment, often used for carrying and transporting goods. Most trolleys on the market are foldable, meaning they can be folded up for storage when not in use. When carrying goods, the trolley needs to be unfolded.

[0005] To achieve the foldable design of the trolley, the bottom frame is often foldable, meaning it consists of multiple hinged parts. The presence of these hinges can lead to insufficient overall rigidity of the bottom frame, causing it to sag when holding heavy items, and in severe cases, break.

[0006] Therefore, how to improve the rigidity of the bottom frame of foldable trolleys has become a technical problem that urgently needs to be solved in this field.

[0007] Application content

[0008] The purpose of the embodiments of this application is to address, to a certain extent, one of the technical problems in the related art. To this end, embodiments of this application provide a trolley with good stability.

[0009] To achieve the above objectives, this application provides a trolley comprising a front support frame assembly, a rear support frame assembly, a bottom frame assembly, and two side frame assemblies. The two side frame assemblies are respectively located on both sides of the bottom frame assembly and spaced apart along the width direction of the bottom frame assembly. The front support frame assembly and the rear support frame assembly are respectively located at both ends of the bottom frame assembly. The trolley has a folded state and an unfolded state. In the folded state, both the bottom frame assembly and the side frame assemblies are folded along the length direction of the trolley. In the unfolded state, both the bottom frame assembly and the side frame assemblies are unfolded along the length direction of the trolley. The trolley further comprises at least one limiting mechanism, and at least one of the side frame assemblies is provided with the limiting mechanism.

[0010] The first end of the limiting mechanism is hinged to the bottom frame assembly. The limiting mechanism can be folded and unfolded with the corresponding side frame assembly. In the unfolded state, the limiting mechanism is connected to the corresponding side frame assembly and forms a support limit between the bottom frame assembly and the side frame assembly to limit the distance between the top sides of the bottom frame assembly and the side frame assembly within a set range. In the folded state, the bottom frame assembly is located between the two opposite side frame assemblies.

[0011] Optionally, the side frame assembly includes a plurality of side frame units, which are sequentially hinged along the length of the trolley;

[0012] The limiting mechanism includes a limiting rod and a sliding pin; a limiting groove is formed on the limiting rod, and the length direction of the limiting groove is consistent with the length direction of the limiting rod;

[0013] The first end of the limiting rod is hinged to the bottom frame assembly, and the sliding pin is set on the side frame unit of the corresponding side frame assembly. The sliding pin is inserted into the limiting groove and can slide along the limiting groove.

[0014] In the unfolded state, the bottom frame assembly is subjected to a pulling force from the limiting rod toward the side frame assembly.

[0015] Optionally, the limiting groove is located in the upper half of the limiting rod;

[0016] The side frame unit includes a first scissor arm and a second scissor arm. The middle part of the first scissor arm is hinged to the middle part of the second scissor arm, and the end of the first scissor arm is hinged to the end of the second scissor arm of the adjacent side frame unit. The middle part of one of the multiple side frame units is hinged by the sliding pin.

[0017] Optionally, the limiting mechanism further includes an auxiliary folding assembly, which includes a first hinge rod and a second hinge rod, wherein a first end of the first hinge rod is hinged to a second end of the limiting rod, and a first end of the second hinge rod is hinged to a second end of the limiting rod.

[0018] The second end of the first hinge rod is hinged to the second scissor arm of a side frame unit of the corresponding side frame assembly, and the second end of the second hinge rod is hinged to the first scissor arm of the side frame unit.

[0019] Optionally, the first scissor arm is located inside the corresponding second scissor arm, the second hinge rod is hinged to the outside of the corresponding first scissor arm, and the first hinge rod is hinged to the inside of the corresponding second scissor arm.

[0020] Optionally, the side frame assembly includes an odd number of side frame units, and the limiting mechanism is disposed on the middle side frame unit.

[0021] Optionally, the bottom frame assembly includes a plurality of bottom frames that are hinged sequentially from front to back, with the front end of the foremost bottom frame hinged to the front support frame assembly, the rear end of the last bottom frame hinged to the rear support frame assembly, and the limiting rod hinged to the bottom frame assembly at the hinge point of two adjacent bottom frames.

[0022] Optionally, the bottom frame includes two opposing side rods and at least one connecting rod connecting the two side rods. The bottom frame at the foremost end is hinged to the front support frame assembly via the side rods of the bottom frame; the bottom frame at the rearmost end is hinged to the rear support frame assembly via the side rods of the bottom frame.

[0023] The two adjacent bottom frames are hinged by side bars on their respective sides.

[0024] Optionally, the front support frame assembly includes a front top connecting rod, a front bottom connecting rod, and two front vertical limiting rods. The front end of the bottom frame assembly is hinged to the front bottom connecting rod. The first ends of the two front vertical limiting rods are respectively fixedly connected to the two ends of the front bottom connecting rod, and the second ends of the two front vertical limiting rods are respectively fixedly connected to the two ends of the front top connecting rod.

[0025] The end of the first scissor arm of the side frame unit located at the front end of the side frame assembly is hinged to the corresponding end of the front top connecting rod, and the end of the second scissor arm of the side frame unit located at the front end of the side frame assembly is slidably mounted on the corresponding front vertical limiting rod.

[0026] Optionally, the rear support frame assembly includes a rear top connecting rod, a rear bottom connecting rod, and two rear vertical limiting rods. The rear end of the bottom frame assembly is hinged to the rear bottom connecting rod. The first ends of the two rear vertical limiting rods are respectively fixedly connected to the two ends of the rear bottom connecting rod, and the second ends of the two rear vertical limiting rods are respectively fixedly connected to the two ends of the rear top connecting rod.

[0027] The end of the second scissor arm of the side frame unit located at the rear end of the side frame assembly is hinged to the corresponding end of the rear top connecting rod, and the end of the first scissor arm of the side frame unit located at the rear end of the side frame assembly is slidably mounted on the corresponding rear vertical limiting rod.

[0028] Optionally, the side frame unit includes a first scissor arm and a second scissor arm, the middle part of the first scissor arm is hinged to the middle part of the second scissor arm, and the end of the first scissor arm is hinged to the end of the second scissor arm of the adjacent side frame unit.

[0029] The second end of the limiting rod is hinged to the corresponding side frame assembly at the first hinge point of two adjacent side frame units, and the second hinge points of the two side frame units hinged to the limiting rod are hinged by the sliding pin.

[0030] In two adjacent side frame units, the first end of the first scissor arm of the front side frame unit is hinged to the second end of the second scissor arm of the rear side frame unit at the first hinge point, and the second end of the second scissor arm of the front side frame unit is hinged to the second end of the first scissor arm of the rear side frame unit at the second hinge point.

[0031] Optionally, the side frame assembly includes an even number of side frame units, and the limiting rod is disposed between two side frame units located in the middle.

[0032] Optionally, the bottom frame assembly includes a plurality of diagonal frame members that are hinged sequentially;

[0033] The inclined rod frame includes a hinge seat, a first inclined rod, a second inclined rod, a third inclined rod, and a fourth inclined rod. The first and second inclined rods are located in the front half of the inclined rod frame, and the third and fourth inclined rods are located in the rear half of the inclined rod frame. The second end of the first and second inclined rods are both hinged to the hinge seat, and the first end of the third and fourth inclined rods are both hinged to the hinge seat.

[0034] The first end of the first diagonal rod of the foremost diagonal frame and the first end of the second diagonal rod of the foremost diagonal frame are both hinged to the front support frame assembly; the second end of the third diagonal rod of the rearmost diagonal frame and the second end of the fourth diagonal rod of the rearmost diagonal frame are both hinged to the rear support frame assembly.

[0035] In two adjacent diagonal bar frames, the second end of the third diagonal bar of the front diagonal bar frame is hinged to the first end of the first diagonal bar of the rear diagonal bar frame, and the second end of the fourth diagonal bar of the front diagonal bar frame is hinged to the second end of the second diagonal bar of the rear diagonal bar frame.

[0036] Optionally, the front support frame assembly includes two front vertical limiting rods disposed opposite each other and a front folding assembly connected between the two front vertical limiting rods. The two front vertical limiting rods are spaced apart along the width direction of the trolley, and the front folding assembly is capable of folding in the width direction.

[0037] The end of the first scissor arm of the side frame unit located at the front end of the side frame assembly is hinged to the top of the corresponding front vertical limit rod, and the end of the second scissor arm of the side frame unit located at the front end of the side frame assembly is slidably mounted on the corresponding front vertical limit rod.

[0038] Optionally, the rear support frame assembly includes two rear vertical limiting rods arranged opposite each other and a rear folding assembly disposed between the two rear vertical limiting rods. The two rear vertical limiting rods are spaced apart along the width direction of the trolley, and the rear folding assembly can achieve folding in the width direction.

[0039] The end of the second scissor arm of the side frame unit located at the rear end of the side frame assembly is hinged to the top of the corresponding rear vertical limit rod, and the end of the first scissor arm of the side frame unit located at the rear end of the side frame assembly is slidably mounted on the corresponding rear vertical limit rod.

[0040] Optionally, the trolley further includes a plurality of wheel assemblies, which are respectively disposed at the bottom of the front support frame assembly and the bottom of the rear support frame assembly.

[0041] Optionally, the limiting mechanism is provided on both of the side frame assemblies.

[0042] Optionally, the trolley also includes a front pull rod mounted on the front support assembly.

[0043] Optionally, the front pull rod is a telescopic rod.

[0044] The beneficial effects of the stroller in the embodiments of this application include, for example:

[0045] In this embodiment, after the trolley is equipped with a limiting mechanism, when the trolley is in the unfolded state, the limiting mechanism connects the bottom frame assembly and the side frame assembly, which can prevent the bottom frame assembly from sagging. Without changing the original structure of the bottom frame assembly, the structural stability of the bottom frame assembly is improved, as well as the overall structural stability of the trolley. Attached Figure Description

[0046] The embodiments of this application are further described below with reference to the accompanying drawings:

[0047] Figure 1 is a schematic diagram of one embodiment of the trolley provided in this application, wherein the trolley is in an unfolded state;

[0048] Figure 2 is a three-dimensional schematic diagram of the trolley in the unfolded state shown in Figure 1.

[0049] Figure 3 is a top view of the trolley in the unfolded state shown in Figure 1;

[0050] Figure 4 is a schematic diagram of the trolley in a semi-folded state;

[0051] Figure 5 is a three-dimensional schematic diagram of the trolley in a semi-folded state as shown in Figure 4.

[0052] Figure 6 is a top view of the trolley in a semi-folded state as shown in Figure 4.

[0053] Figure 7 is a schematic diagram of the limiting mechanism according to an embodiment of this application;

[0054] Figure 8 is a structural schematic diagram of the side frame assembly according to an embodiment of this application;

[0055] Figure 9 is a schematic diagram of one embodiment of the bottom frame component of this application;

[0056] Figure 10 is a schematic diagram of the trolley provided in the embodiment of this application in a semi-folded state;

[0057] Figure 11 is a perspective view of the trolley in the unfolded state provided in the embodiment of this application;

[0058] Figure 12 is a top view of the trolley provided in an embodiment of this application;

[0059] Figure 13 is a perspective view of the trolley provided in the embodiment of this application in a semi-folded state;

[0060] Figure 14 is a schematic diagram of the trolley provided in the embodiment of this application in a folded state.

[0061] Icons: 100-Front support frame assembly; 110-Front top connecting rod; 120-Front bottom connecting rod; 130-Front vertical limiting rod; 140-Front folding assembly; 200-Rear support frame assembly; 210-Rear top connecting rod; 220-Rear bottom connecting rod; 230-Rear vertical limiting rod; 240-Rear folding assembly; 300-Bottom frame assembly; 310-Bottom frame; 311-Side rod; 312-Connecting rod; 320-Diagonal rod frame; 321-First diagonal rod; 322- Second diagonal bar; 323-Third diagonal bar; 324-Fourth diagonal bar; 325-Hinge seat; 400-Side frame assembly; 410-Side frame unit; 411-First scissor arm; 412-Second scissor arm; 500-Limiting mechanism; 510-Limiting rod; 511-Limiting groove; 520-Sliding pin; 530-Auxiliary folding assembly; 531-First hinge rod; 532-Second hinge rod; 511-Limiting groove; 600-Wheel assembly; 700-Front pull rod. Embodiments of the present invention

[0062] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described are intended to explain this application and should not be construed as limiting it.

[0063] The terms "an embodiment," "example," or "example" used in this specification refer to a particular feature, structure, or characteristic described in connection with the embodiment itself that may be included in at least one embodiment disclosed in this application. The phrase "in an embodiment" appearing in various places throughout the specification does not necessarily refer to the same embodiment.

[0064] In this application, "front" refers to the direction in which the front of the cart is facing, and "rear" refers to the direction in which the rear of the cart is facing, both of which are indicated by double-headed arrows in the figures.

[0065] An embodiment of this application provides a trolley, as shown in Figures 1, 2, 4, 5, 6, 10, 11, 12, and 13. The trolley includes a front support frame assembly 100, a rear support frame assembly 200, a bottom frame assembly 300, and two side frame assemblies 400. The two side frame assemblies 400 are located on both sides of the bottom frame assembly 300 and spaced apart along the width direction of the bottom frame assembly 300. The front support frame assembly 100 and the rear support frame assembly 200 are located at both ends of the bottom frame assembly 300. The trolley has a folded state and an unfolded state. In the folded state (see Figure 14), both the bottom frame assembly 300 and the side frame assemblies 400 are folded along the length direction of the trolley. In the unfolded state, both the bottom frame assembly 300 and the side frame assemblies 400 are unfolded along the length direction of the trolley.

[0066] The trolley also includes at least one limiting mechanism 500. At least one side frame assembly 400 is provided with a limiting mechanism 500. The first end of the limiting mechanism 500 is hinged to the bottom frame assembly 300. The limiting mechanism 500 can be folded and unfolded with the corresponding side frame assembly 400. In the unfolded state, the limiting mechanism 500 is connected to the corresponding side frame assembly 400 and forms a support limit between the bottom frame assembly 300 and the side frame assembly 400 to limit the distance between the top sides of the bottom frame assembly 300 and the side frame assembly 400 within a set range. When the trolley is in the folded state, the bottom frame assembly 300 is located between the two opposite side frame assemblies 400.

[0067] In this embodiment of the application, after the limiting mechanism 500 is set, when the trolley is in the unfolded state, the limiting mechanism 500 connects the bottom frame assembly 300 with the side frame assembly 400, which can prevent the bottom frame assembly 300 from sagging. Without changing the original structure of the bottom frame assembly 300, the structural stability of the bottom frame assembly 300 is improved, and the overall structural stability of the trolley is also improved.

[0068] In the embodiments of this application, "the limiting mechanism 500 can be folded and unfolded with the corresponding side frame assembly 400" means that the limiting mechanism 500 does not hinder the folding and unfolding of the side frame assembly 400.

[0069] In this embodiment, the specific structure of the side frame assembly 400 is not specifically limited, as long as it can be folded along the length of the trolley. In the embodiment shown in FIG8, the side frame assembly 400 includes a plurality of side frame units 410, which are sequentially hinged along the length of the trolley.

[0070] As shown in Figure 7, the limiting mechanism 500 may include a limiting rod 510 and a sliding pin 520; a limiting groove 511 is formed on the limiting rod 510, and the length direction of the limiting groove 511 is consistent with the length direction of the limiting rod 510.

[0071] The first end of the limiting rod 510 (the lower end in Figure 1) is hinged to the bottom frame assembly 300. The sliding pin 520 is set on the side frame unit 410 of the corresponding side frame assembly 400. The sliding pin 520 is inserted into the limiting slide groove 511 and can slide along the limiting slide groove 511.

[0072] When the trolley is in the unfolded state, the sliding pin 520 is located on the end of the limiting slide groove 511 away from the bottom frame assembly 300, so that the bottom frame assembly 300 is subjected to the pulling force (i.e., upward pulling force) of the limiting rod 510 toward the side frame assembly 400.

[0073] During the process of the trolley changing from the unfolded state to the folded state, the sliding pin 520 slides along the limiting slide groove 511. During the process of the trolley changing from the folded state to the unfolded state, the sliding pin 520 will also slide along the limiting slide groove 511, thereby realizing the above-mentioned "limiting mechanism 500 does not hinder the folding and unfolding of the side frame assembly 400".

[0074] It should be noted that the limit rod 510 is a rigid rod, which can better maintain the overall stability of the trolley.

[0075] In this embodiment, the length of the limiting groove 511 is not specifically limited, as long as the limiting rod 510 can apply an upward pulling force to the bottom frame assembly 300 when the sliding pin 520 slides to a state corresponding to the unfolded state of the trolley. Optionally, the length of the limiting groove 511 does not exceed half the length of the limiting rod 510, which can reduce the sliding stroke of the sliding pin 520 and ensure that the bottom frame assembly 300 is lifted towards the side frame assembly 400.

[0076] In this embodiment, there is no particular limitation on the position of the limiting rod 510 on the side frame assembly 400. To ensure the smooth progress of the folding process and maintain the overall stability of the bottom frame assembly 300, the limiting rod 510 may optionally be positioned at the middle position in the length direction of the trolley.

[0077] In this embodiment, the specific structure of the side frame unit 410 is not specifically limited, as long as the side frame unit 410 can drive the sliding pin 520 to slide in the limiting groove 511 during the folding process. For example, the side frame unit 410 can be a scissor lift unit. That is, the side frame unit 410 includes a first scissor lift arm 411 and a second scissor lift arm 412, the middle part of the first scissor lift arm 411 is hinged to the middle part of the second scissor lift arm 412, and the end of the first scissor lift arm 411 is hinged to the end of the second scissor lift arm 412 of the adjacent side frame unit 410.

[0078] In this embodiment, the position of the upper limit groove 511 of the limiting rod 510 and the setting position of the sliding pin 520 are not specifically limited. For example, in the embodiments shown in Figures 1 and 7, the limiting groove 511 is located in the upper half of the limiting rod 510, and the middle part of one of the multiple side frame units 410 is hinged by the sliding pin 520. That is, the middle parts of the first scissor arm 411 and the second scissor arm 412 of one of the side frame units 410 are hinged by the sliding pin 520.

[0079] In this embodiment, the top end of the limiting rod 510 protrudes beyond the middle of the corresponding side frame unit 410 (i.e., the top end of the limiting rod 510 is higher than the middle of the corresponding side frame unit 410).

[0080] As shown in Figure 2, when the trolley is in the unfolded state, the sliding pin 520 is located at the top of the limiting groove 511. When switching to the folded state, the sliding pin 520 slides towards the bottom of the limiting groove 511.

[0081] To facilitate folding, as shown in Figures 1 and 7, the limiting mechanism 500 may optionally include an auxiliary folding assembly 530, which includes a first hinge rod 531 and a second hinge rod 532. The first end of the first hinge rod 531 is hinged to the second end (i.e., the top end) of the limiting rod 510, and the first end of the second hinge rod 532 is hinged to the second end (i.e., the top end) of the limiting rod 510.

[0082] The second end of the first hinge rod 531 is hinged to the second scissor arm 412 of a side frame unit 410 of the corresponding side frame assembly 400, and the second end of the second hinge rod 532 is hinged to the first scissor arm 411 of the side frame unit 410.

[0083] During the folding process of the trolley, the auxiliary folding assembly 530, including the first hinge rod 531 and the second hinge rod 532, also folds. During the unfolding process of the trolley, the auxiliary folding assembly 530, including the first hinge rod 531 and the second hinge rod 532, also unfolds. The first hinge rod 531 and the second hinge rod 532 are respectively set at both ends of the limiting rod 510, which can make the limiting rod 510 more secure and improve the lifting effect on the bottom frame assembly 300.

[0084] For ease of setup, optionally, the first scissor arm 411 is located inside the corresponding second scissor arm 412, the first hinge rod 531 is hinged to the inside of the corresponding second scissor arm 412, and the second hinge rod 532 is hinged to the outside of the corresponding first scissor arm 411.

[0085] In the embodiment shown in Figure 2, the side frame assembly 400 includes an odd number of side frame units 410, and a limiting mechanism 500 is disposed on the side frame unit 410 located in the middle.

[0086] In the embodiments shown in Figures 1 to 5 and Figure 8, the side frame assembly 400 includes three side frame units 410, and the limiting mechanism 500 is disposed on the second side frame unit 410. Of course, the embodiments of this application are not limited thereto.

[0087] In another embodiment of this application, the second end (top) of the limiting rod 510 is hinged to the corresponding side frame assembly 400 at the first hinge of two adjacent side frame units 410. The limiting groove 511 is provided in the lower half of the limiting rod 510. The second hinge of the two side frame units 410 hinged to the limiting rod 510 is hinged by the sliding pin 520.

[0088] In two adjacent side frame units 410, the first end of the first scissor arm 411 of the front side frame unit 410 is hinged at the first hinge point A to the second end of the second scissor arm 412 of the rear side frame unit 410, and the second end of the second scissor arm 412 of the front side frame unit 410 is hinged at the second hinge point B to the second end of the first scissor arm 411 of the rear side frame unit 410.

[0089] In the unfolded state, the sliding pin 520 is located at the top of the limiting slide groove 511, which can apply an upward force to the bottom frame assembly 300 to prevent the bottom frame assembly 300 from sagging. When folding the trolley, the sliding pin 520 moves along the limiting slide groove 511 toward the bottom end of the limiting slide groove 511.

[0090] In this embodiment, the specific structure of the front support frame assembly 100 is not specifically limited. Optionally, as shown in FIG1, the front support frame 100 assembly includes a front top connecting rod 110, a front bottom connecting rod 120, and two front vertical limiting rods 130. The front end of the bottom frame assembly 300 is hinged to the front bottom connecting rod 120. The first ends of the two front vertical limiting rods 130 are respectively fixedly connected to the two ends of the front bottom connecting rod 120, and the second ends of the two front vertical limiting rods 130 are respectively fixedly connected to the two ends of the front top connecting rod 110.

[0091] The end of the first scissor arm 411 of the side frame unit 410 located at the front end of the side frame assembly 400 is hinged to the corresponding end of the front top connecting rod 110, and the end of the second scissor arm 412 of the side frame unit 410 located at the front end of the side frame assembly 400 is slidably mounted on the corresponding front vertical limiting rod 130.

[0092] Optionally, as shown in Figure 1, the rear support frame assembly 200 includes a rear top connecting rod 210, a rear bottom connecting rod 220, and two rear vertical limiting rods 230. The rear end of the bottom frame assembly 300 is hinged to the rear bottom connecting rod 220. The first ends of the two rear vertical limiting rods 230 are fixedly connected to the two ends of the rear bottom connecting rod 220, and the second ends of the two rear vertical limiting rods 230 are fixedly connected to the two ends of the rear top connecting rod 210, respectively.

[0093] As an optional implementation, the rear support frame assembly 200 includes a rear top connecting rod 210, a rear bottom connecting rod 220, two rear vertical limiting rods 230, and two diagonal braces. The rear end of the bottom frame assembly 300 is hinged to the rear bottom connecting rod 220, and the first ends of the two rear vertical limiting rods 230 are fixedly connected to the two ends of the rear bottom connecting rod 220, respectively. The rear top connecting rod 210 includes two oppositely arranged side top connecting rods and a horizontal top connecting rod connecting the first ends of the two side top connecting rods. The two side top connecting rods correspond one-to-one with the two diagonal braces, and the second ends of the two side top connecting rods are hinged to the two rear vertical limiting rods 230, respectively.

[0094] Two diagonal braces correspond one-to-one with two rear vertical limiting rods 230. The first end of the diagonal brace is hinged to the end of the first scissor arm 411 at the rear end, and the second end of the diagonal brace is hinged to the middle of the corresponding side top connecting rod.

[0095] The rear support frame assembly 200 is configured in the above structure, which makes it convenient for the user to grasp the horizontal top connecting rod to push the trolley (see Figure 3) and also facilitates the folding of the trolley (see Figure 4).

[0096] As shown in Figure 1, the end of the second scissor arm 412 of the side frame unit 410 located at the rear end of the side frame assembly 400 is hinged to the corresponding end of the rear top connecting rod 210, and the end of the first scissor arm 411 of the side frame unit 410 located at the rear end of the side frame assembly 400 is slidably mounted on the corresponding rear vertical limiting rod 230.

[0097] As an optional implementation, as shown in Figures 10 to 13, the side frame assembly 400 may include an even number of the side frame units 410, with a limiting rod 510 disposed between two side frame units 410 located in the middle. In the embodiment shown in Figure 10, the trolley includes four side frame units 410, with the limiting rod 510 disposed between the second and third side frame units 410.

[0098] In this application embodiment, the specific structure of the bottom frame assembly 300 is not specifically limited. For example, in the embodiments shown in FIG1 and FIG9, the bottom frame assembly 300 may include a plurality of bottom frames 310 that are hinged sequentially from front to back. The front end of the foremost bottom frame 310 is hinged to the front support frame assembly 100, and the rear end of the last bottom frame 310 is hinged to the rear support frame assembly 200. The limiting rod 510 is hinged to the bottom frame assembly 300 at the hinge point of two adjacent bottom frames 310.

[0099] The base frame assembly 300, which includes multiple base frames 310 that are hinged in sequence, can be folded along with the side frame assembly 400, and the base frame 310 also has excellent load-bearing capacity.

[0100] In the embodiment shown in Figure 9, the bottom frame 310 includes two opposing side rods 311 and at least one connecting rod 312 connecting the two side rods 311. The foremost bottom frame 310 is hinged to the front support frame assembly 100 via the side rods 311 of the bottom frame 310; the rearmost bottom frame 310 is hinged to the rear support frame assembly 200 via the side rods 311 of the bottom frame 310. Adjacent bottom frames 310 are hinged via the side rods 311 on their respective sides (i.e., the two side rods 311 on the left side are hinged to each other, and the two side rods 311 on the right side are hinged to each other).

[0101] In the above embodiment, the bottom frame 310 is a square frame, which can better support items.

[0102] Of course, the embodiments of this application are not limited thereto. In the embodiments shown in Figures 10 to 13, the bottom frame assembly 300 includes a plurality of diagonal frame frames 320 that are hinged in sequence.

[0103] As shown in Figures 10 and 12, the inclined frame 320 includes a hinge seat 325, a first inclined rod 321, a second inclined rod 322, a third inclined rod 323, and a fourth inclined rod 324. The first inclined rod 321 and the second inclined rod 322 are located in the front half of the inclined frame 320, and the third inclined rod 323 and the fourth inclined rod 324 are located in the rear half of the inclined frame 320. The second end of the first inclined rod 321 and the second end of the second inclined rod 322 are both hinged to the hinge seat 325, and the first ends of the third inclined rod 323 and the fourth inclined rod 324 are both hinged to the hinge seat 325.

[0104] The first end of the first diagonal rod 321 of the foremost diagonal rod frame 320 and the first end of the second diagonal rod 322 of the foremost diagonal rod frame 320 are both hinged to the front support frame 100 assembly; the second end of the third diagonal rod 323 of the rearmost diagonal rod frame 320 and the second end of the fourth diagonal rod 324 of the rearmost diagonal rod frame 320 are both hinged to the rear support frame assembly 200.

[0105] In two adjacent diagonal frame frames 320, the second end of the third diagonal 323 of the front diagonal frame frame 320 is hinged to the first end of the first diagonal 321 of the rear diagonal frame frame 320, and the second end of the fourth diagonal 324 of the front diagonal frame frame 320 is hinged to the second end of the second diagonal 322 of the rear diagonal frame frame 320.

[0106] In the embodiment shown in Figure 12, the bottom frame assembly 300 includes two diagonal frame frames 320. The lower end of the limiting rod 510 is hinged to the bottom frame assembly 300 at the hinge point of the two diagonal frame frames 320.

[0107] As shown in Figure 11, the front support assembly 100 may include two front vertical limiting rods 130 arranged opposite each other and a front folding assembly 140 disposed between the two front vertical limiting rods 130. The two front vertical limiting rods 130 are spaced apart along the width direction of the trolley, and the front folding assembly 140 can achieve folding in the width direction.

[0108] The end of the first scissor arm 411 of the side frame unit 410 located at the front end of the side frame assembly 400 is hinged to the top end of the corresponding front vertical limiting rod 130, and the end of the second scissor arm 412 of the side frame unit 410 located at the front end of the side frame assembly 400 is slidably mounted on the corresponding front vertical limiting rod 130.

[0109] Accordingly, as shown in Figure 11, the rear support frame assembly 200 may include two rear vertical limiting rods 230 arranged opposite each other and a rear folding assembly 240 disposed between the two rear vertical limiting rods 230. The two rear vertical limiting rods 230 are spaced apart along the width direction of the trolley, and the rear folding assembly 240 is capable of folding in the width direction.

[0110] The end of the second scissor arm 412 of the side frame unit 410 located at the rear end of the side frame assembly 400 is hinged to the top end of the corresponding rear vertical limiting rod 230, and the end of the first scissor arm 411 of the side frame unit 410 located at the rear end of the side frame assembly 400 is slidably mounted on the corresponding rear vertical limiting rod 230.

[0111] When the trolley is folded, the front support frame assembly 100, the rear support frame assembly 200, and the bottom frame assembly 300 are folded along the width direction, while the side frame assembly 400 and the bottom frame assembly 300 are folded along the length direction.

[0112] Optionally, the trolley also includes a plurality of wheel assemblies 600, which are respectively disposed at the bottom of the front support frame assembly 100 and the bottom of the rear support frame assembly 200.

[0113] Optionally, both side frame assemblies 400 are equipped with limiting mechanisms 500. The limiting mechanisms 500 can restrict the height of the folded trolley within a certain range, preventing the trolley from becoming too large after folding, thus facilitating its carrying and storage.

[0114] To facilitate dragging, the trolley may optionally include a front pull rod 700 mounted on the front support assembly 100; optionally, the front pull rod 700 may be a telescopic rod to accommodate dragging by people of different heights.

[0115] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Those skilled in the art should understand that this application includes, but is not limited to, the contents described in the accompanying drawings and the specific embodiments above. Any modifications that do not depart from the functional and structural principles of this application will be included within the scope of the claims. Industrial applicability

[0116] In summary, this application provides a trolley with advantages of high structural stability and rigidity, avoiding sagging of the bottom frame assembly and capable of carrying heavy items.

Claims

1. A trolley comprising a front support frame assembly (100), a rear support frame assembly (200), a bottom frame assembly (300), and two side frame assemblies (400), the two side frame assemblies (400) being located on opposite sides of the bottom frame assembly (300) and spaced apart along the width direction of the bottom frame assembly (300), the front support frame assembly (100) and the rear support frame assembly (200) being located at opposite ends of the bottom frame assembly (300), the trolley having a folded state and an unfolded state, wherein in the folded state, the bottom frame assembly (300) and the side frame assemblies (400) are both folded along the length direction of the trolley, and in the unfolded state, the bottom frame assembly (300) and the side frame assemblies (400) are both unfolded along the length direction of the trolley, characterized in that, The trolley also includes at least one limiting mechanism (500), and the limiting mechanism (500) is provided on at least one of the side frame assemblies (400). The first end of the limiting mechanism (500) is hinged to the bottom frame assembly (300). The limiting mechanism (500) can be folded and unfolded with the corresponding side frame assembly (400). In the unfolded state, the limiting mechanism (500) is connected to the corresponding side frame assembly (400) and forms a support limit between the bottom frame assembly (300) and the side frame assembly (400) to limit the distance between the top sides of the bottom frame assembly (300) and the side frame assembly (400) within a set range. In the folded state, the bottom frame assembly (300) is located between the two opposite side frame assemblies (400).

2. The trolley according to claim 1, characterized in that, The side frame assembly (400) includes a plurality of side frame units (410), which are sequentially hinged along the length of the trolley. The limiting mechanism (500) includes a limiting rod (510) and a sliding pin (520); a limiting groove (511) is formed on the limiting rod (510), and the length direction of the limiting groove (511) is consistent with the length direction of the limiting rod (510); The first end of the limiting rod (510) is hinged to the bottom frame assembly (300), and the sliding pin (520) is disposed on the side frame unit (410) of the side frame assembly (400). The sliding pin (520) is inserted into the limiting groove (511) and can slide along the limiting groove (511). In the unfolded state, the bottom frame assembly (300) is subjected to a pulling force from the limiting rod (510) toward the side frame assembly (400).

3. The trolley according to claim 2, characterized in that, The limiting groove (511) is located in the upper half of the limiting rod (510); The side frame unit (410) includes a first scissor arm (411) and a second scissor arm (412). The middle part of the first scissor arm (411) is hinged to the middle part of the second scissor arm (412), and the end of the first scissor arm (411) is hinged to the end of the second scissor arm (412) of the adjacent side frame unit (410). The middle part of one of the multiple side frame units (410) is hinged by the sliding pin (520).

4. The trolley according to claim 3, characterized in that, The limiting mechanism (500) further includes an auxiliary folding assembly (530), which includes a first hinge rod (531) and a second hinge rod (532). The first end of the first hinge rod (531) is hinged to the second end of the limiting rod (510), and the first end of the second hinge rod (532) is hinged to the second end of the limiting rod (510). The second end of the first hinge rod (531) is hinged to the second scissor arm (412) of a side frame unit (410) of the corresponding side frame assembly (400), and the second end of the second hinge rod (532) is hinged to the first scissor arm (411) of the side frame unit (410).

5. The trolley according to claim 4, characterized in that, The first scissor arm (411) is located inside the corresponding second scissor arm (412), the second hinge rod (532) is hinged to the outside of the corresponding first scissor arm (411), and the first hinge rod (531) is hinged to the inside of the corresponding second scissor arm (412).

6. The trolley according to any one of claims 2 to 5, characterized in that, The side frame assembly (400) includes an odd number of side frame units (410), and the limiting mechanism (500) is disposed on the middle side frame unit (410).

7. The trolley according to any one of claims 2 to 5, characterized in that, The bottom frame assembly (300) includes a plurality of bottom frames (310) that are hinged sequentially from front to back. The front end of the foremost bottom frame (310) is hinged to the front support frame assembly (100), and the rear end of the last bottom frame (310) is hinged to the rear support frame assembly (200). The limiting rod (510) is hinged to the bottom frame assembly (300) at the hinge point of two adjacent bottom frames (310).

8. The trolley according to claim 7, characterized in that, The bottom frame (310) includes two opposing side rods (311) and at least one connecting rod (312) connecting the two side rods (311). The bottom frame (310) at the foremost end is hinged to the front support frame assembly (100) through the side rods (311) of the bottom frame (310); the bottom frame (310) at the rearmost end is hinged to the rear support frame assembly (200) through the side rods (311) of the bottom frame (310). The two adjacent bottom frames (310) are hinged by side bars (311) on the corresponding sides.

9. The trolley according to any one of claims 3 to 5, characterized in that, The front support frame assembly (100) includes a front top connecting rod (110), a front bottom connecting rod (120), and two front vertical limiting rods (130). The front end of the bottom frame assembly (300) is hinged to the front bottom connecting rod (120). The first ends of the two front vertical limiting rods (130) are fixedly connected to the two ends of the front bottom connecting rod (120), and the second ends of the two front vertical limiting rods (130) are fixedly connected to the two ends of the front top connecting rod (110). The end of the first scissor arm (411) of the side frame unit (410) located at the front end of the side frame assembly (400) is hinged to the corresponding end of the front top connecting rod (110), and the end of the second scissor arm (412) of the side frame unit (410) located at the front end of the side frame assembly (400) is slidably mounted on the corresponding front vertical limiting rod (130).

10. The trolley according to any one of claims 3 to 5, characterized in that, The rear support frame assembly (200) includes a rear top connecting rod (210), a rear bottom connecting rod (220), and two rear vertical limiting rods (230). The rear end of the bottom frame assembly (300) is hinged to the rear bottom connecting rod (220). The first ends of the two rear vertical limiting rods (230) are fixedly connected to the two ends of the rear bottom connecting rod (220), and the second ends of the two rear vertical limiting rods (230) are fixedly connected to the two ends of the rear top connecting rod (210). The end of the second scissor arm (412) of the side frame unit (410) located at the rear end of the side frame assembly (400) is hinged to the corresponding end of the rear top connecting rod (210). The end of the first scissor arm (411) of the side frame unit (410) located at the rear end of the side frame assembly (400) is slidably mounted on the corresponding rear vertical limiting rod (230).

11. The trolley according to claim 2, characterized in that, The side frame unit (410) includes a first scissor arm (411) and a second scissor arm (412). The middle part of the first scissor arm (411) is hinged to the middle part of the second scissor arm (412), and the end of the first scissor arm (411) is hinged to the end of the second scissor arm (412) of the adjacent side frame unit (410). The second end of the limiting rod (510) is hinged to the corresponding side frame assembly (400) at the first hinge point of two adjacent side frame units (410), and the second hinge points of the two side frame units (410) hinged to the limiting rod (510) are hinged by the sliding pin (520); wherein, In two adjacent side frame units (410), the first end of the first scissor arm (411) of the front side frame unit (410) is hinged at the first hinge point to the second end of the second scissor arm (412) of the rear side frame unit (410), and the second end of the second scissor arm (412) of the front side frame unit (410) is hinged at the second hinge point to the second end of the first scissor arm (411) of the rear side frame unit (410).

12. The trolley according to claim 11, characterized in that, The side frame assembly (400) includes an even number of side frame units (410), and the limiting rod (510) is disposed between two side frame units (410) located in the middle.

13. The trolley according to claim 11, characterized in that, The bottom frame assembly (300) includes a plurality of diagonal frame frames (320) that are hinged in sequence. The inclined rod frame (320) includes a hinge seat (325), a first inclined rod (321), a second inclined rod (322), a third inclined rod (323), and a fourth inclined rod (324). The first inclined rod (321) and the second inclined rod (322) are located in the front half of the inclined rod frame (320), and the third inclined rod (323) and the fourth inclined rod (324) are located in the rear half of the inclined rod frame (320). The second end of the first inclined rod (321) and the second end of the second inclined rod (322) are both hinged to the hinge seat (325), and the first end of the third inclined rod (323) and the fourth inclined rod (324) are both hinged to the hinge seat (325). The first end of the first diagonal bar (321) of the diagonal bar frame (320) located at the foremost end and the first end of the second diagonal bar (322) of the diagonal bar frame (320) located at the foremost end are both hinged to the front support frame assembly (100); the second end of the third diagonal bar (323) of the diagonal bar frame located at the rear end and the second end of the fourth diagonal bar (324) of the diagonal bar frame (320) located at the rear end are both hinged to the rear support frame assembly (200); In two adjacent inclined rod frames (320), the second end of the third inclined rod (323) of the front inclined rod frame (320) is hinged to the first end of the first inclined rod (321) of the rear inclined rod frame (320), and the second end of the fourth inclined rod (324) of the front inclined rod frame (320) is hinged to the second end of the second inclined rod (322) of the rear inclined rod frame (320).

14. The stroller according to any one of claims 11 to 13, characterized in that, The front support frame assembly (100) includes two front vertical limiting rods (130) arranged opposite to each other and a front folding assembly (140) connected between the two front vertical limiting rods (130). The two front vertical limiting rods (130) are spaced apart along the width direction of the trolley, and the front folding assembly (140) can be folded in the width direction. The end of the first scissor arm (411) of the front-end side frame unit (410) in the side frame assembly (400) is hinged to the top of the corresponding front vertical limit rod (130), and the end of the second scissor arm (412) of the front-end side frame unit (410) in the side frame assembly (400) is slidably mounted on the corresponding front vertical limit rod (130).

15. The stroller according to any one of claims 11 to 13, characterized in that, The rear support frame assembly (200) includes two rear vertical limiting rods (230) arranged opposite to each other and a rear folding assembly (240) disposed between the two rear vertical limiting rods (230). The two rear vertical limiting rods (230) are spaced apart along the width direction of the trolley, and the rear folding assembly (240) can achieve folding in the width direction. The end of the second scissor arm (412) of the side frame unit (410) located at the rear end of the side frame assembly (400) is hinged to the top of the corresponding rear vertical limit rod (230), and the end of the first scissor arm (411) of the side frame unit (410) located at the rear end of the side frame assembly (400) is slidably mounted on the corresponding rear vertical limit rod (230).

16. The stroller according to any one of claims 1 to 5 and 11 to 13, characterized in that, The trolley also includes a plurality of wheel assemblies (600), which are respectively disposed at the bottom of the front support frame assembly (100) and the bottom of the rear support frame assembly (200).

17. The stroller according to any one of claims 1 to 5 and 11 to 13, characterized in that, The limiting mechanism (500) is provided on both of the side frame assemblies (400).

18. The trolley according to claim 1, characterized in that, The trolley also includes a front pull rod (700) mounted on the front support assembly (100).

19. The trolley according to claim 18, characterized in that, The front pull rod (700) is a telescopic rod.

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