stroller

Abstract

The utility model relates to a kind of trolley, including front support, rear support, push rod frame and linkage frame, the upper portion of the front support is connected with the upper portion of the rear support around first axis line rotation, the push rod frame is connected on the rear support around second axis line rotation, the linkage frame is movably connected between the lower portion of the front support and the push rod frame, to when the push rod frame is folded back relative to the rear support rotation, the linkage frame is driven by the upward movement of the lower portion of the push rod frame to make the front support and the rear support mutually fold along front-back direction.When trolley is unlocked, push rod frame can be folded back under the action of dead weight, thereby driving the relative motion of each rod on trolley and gradually folding, and further realizing the automatic folding of trolley or the folding of auxiliary trolley, which simplifies the folding steps of trolley, and the folding operation of entire trolley can be completed by single hand, bringing convenience for daily use of user.

Description

Technical Field

[0001] This utility model relates to a trolley, specifically a foldable trolley. Background Technology

[0002] In existing technology, strollers typically have a foldable frame to reduce space occupation when carried or not in use. However, the structures of strollers on the market vary widely, and folding them usually requires the operator to manually drive the relative movement of each lever. The folding operation often requires multiple steps and usually requires the cooperation of both hands, which is inconvenient for daily use. Utility Model Content

[0003] The purpose of this invention is to provide a new type of trolley structure that makes it easier to fold.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a trolley having an unfolded state and a folded state, the trolley including a front support, a rear support, a push rod frame and a linkage frame, the upper part of the front support and the upper part of the rear support being rotatably connected around a first axis, the push rod frame being rotatably connected to the rear support around a second axis, and the linkage frame being movably connected between the lower parts of the front support and the push rod frame, so that when the push rod frame rotates backward relative to the rear support to retract, the linkage frame is driven by the upward movement of the lower part of the push rod frame, causing the front support and the rear support to retract towards each other in the front-rear direction.

[0005] In some embodiments, the front part of the linkage frame is rotatably connected to the front support about a third axis, and the rear part of the linkage frame is rotatably connected to the lower part of the push rod frame about a fourth axis. When the push rod frame rotates and retracts relative to the rear support, the lower part of the push rod frame and the rear part of the linkage frame both move upward, causing the front support and the rear support to retract in the front-rear direction.

[0006] In some embodiments, when the trolley is in an unfolded state and in a folded state, the second axis, the third axis, and the fourth axis are all lower than the first axis in the vertical direction.

[0007] In some embodiments, when the trolley is in an unfolded state, the fourth axis is lower than the second axis in the vertical direction; when the trolley is in a folded state, the fourth axis is higher than the second axis.

[0008] In some embodiments, when the trolley is in the unfolded state, the line connecting the third axis and the second axis forms an axis connecting line, and the fourth axis is located below the axis connecting line. When the trolley is transitioning from the unfolded state to the folded state, the front support first moves away from the rear support and then moves closer to the rear support.

[0009] In some embodiments, the third axis and the fourth axis are projected into a vertical plane and then connected to form a first line, and the second axis and the fourth axis are projected into the vertical plane and then connected to form a second line, and the included angle between the first line and the second line is 150° to 180°; the push rod frame extends in a straight line as a whole.

[0010] In some embodiments, the trolley further includes a seat assembly, which includes a seat frame and a slider. The slider is rotatably mounted on the front support. The seat frame is slidably connected to the slider along its own length direction. The rear part of the seat frame is rotatably connected to the linkage frame or to the push rod frame. Alternatively, the rear part of the seat frame, the rear part of the linkage frame, and the lower part of the push rod frame are rotatably connected around the fourth axis.

[0011] In some embodiments, the rear portion of the seat frame is rotatably connected to the push rod frame about a fifth axis, and the fifth axis is located between the second axis and the fourth axis along the length extension direction of the push rod frame.

[0012] In some embodiments, the slider is rotatably connected to the front bracket about a sixth axis, wherein the sixth axis is always located above the third axis along the length extension direction of the front bracket, and / or the distance between the sixth axis and the second axis is less than the distance between the sixth axis and the third axis.

[0013] In some embodiments, the trolley further includes a push handle frame, the lower part of which is rotatably connected to the upper part of the push rod frame about a seventh axis, wherein the fourth axis, the second axis, and the seventh axis are collinear in projection onto the same vertical plane.

[0014] In some embodiments, the rear support includes a rear support body and a connecting end extending from the rear support body toward the front support. The rear support body is rotatably connected to the upper part of the front support about a first axis, and the push rod frame is rotatably connected to the connecting end about a second axis. In the unfolded state, the second axis is located in front of the rear support body. The distance between the third axis and the fourth axis is greater than the distance between the fourth axis and the second axis.

[0015] Due to the application of the above technical solution, this utility model has the following advantages: In the trolley provided by this utility model embodiment, when the push rod frame rotates and retracts relative to the rear support, its lower part moves upward, which drives the linkage frame to move. The movement of the linkage frame drives the front support and the rear support to retract in the front-rear direction, so that the trolley changes from an unfolded state to a folded state, realizing the folding of the trolley. In this way, when the trolley is unlocked, the push rod frame can flip backward under its own weight, thereby driving the relative movement of the various rods on the trolley and gradually retracting them, thus realizing the automatic folding or assisted folding of the trolley. This simplifies the folding steps of the trolley, and the entire folding operation of the trolley can be completed with one hand, bringing convenience to the user's daily use. Attached Figure Description

[0016] To more clearly illustrate the technical solution of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a three-dimensional structural diagram of a trolley in an unfolded state according to an embodiment of the present invention.

[0018] Figure 2 for Figure 1 A structural exploded view of the cart;

[0019] Figure 3 for Figure 1 A side view of the trolley's structure;

[0020] Figure 4 for Figure 1 A schematic diagram of the three-dimensional structure of the push handle frame after it has been flipped and folded relative to the push rod frame in the trolley;

[0021] Figure 5 for Figure 4 A side view of the trolley's structure;

[0022] Figure 6 for Figure 4 Based on this, a three-dimensional structural diagram shows the push rod frame flipping backward to put the trolley in the folding process.

[0023] Figure 7 for Figure 6 A side view of the trolley's structure;

[0024] Figure 8 for Figure 1 A three-dimensional structural diagram of the stroller in its folded state;

[0025] Figure 9 for Figure 8 A side view of the trolley's structure;

[0026] Figure 10 for Figure 8 A front view diagram of the trolley's structure;

[0027] Figure 11 for Figure 8 A top view of the trolley's structure;

[0028] Figure 12 This is a side view of the trolley in its unfolded state, according to another embodiment of the utility model.

[0029] In the attached diagrams above:

[0030] 1. Front bracket; 11. Front strut; 12. Front crossbar;

[0031] 2. Rear bracket; 21. Rear support rod; 22. Connecting end; 23. Rear crossbar;

[0032] 3. Push rod holder; 31. Push rod;

[0033] 4. Push handle frame; 41. Push handle lever;

[0034] 5. Linkage frame; 51. Linkage rod;

[0035] 6. Seat assembly; 61. Sliding element; 62. Seat post;

[0036] 10. Front wheel assembly; 20. Rear wheel assembly;

[0037] X1, First axis line; X2, Second axis line; X3, Third axis line; X4, Fourth axis line;

[0038] X5, the fifth axis; X6, the sixth axis; X7, the seventh axis. Detailed Implementation

[0039] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art. It should be noted that the description of these embodiments is for the purpose of aiding understanding the present invention, but does not constitute a limitation thereof. Furthermore, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0040] In this document, the terms "up," "down," "left," "right," "front," and "back" indicate the orientation based on the orientation observed by the person pushing the cart while it is in its unfolded state, standing on one side of the cart and facing it. They are used only for the convenience of describing this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0041] See Figures 1 to 11 The illustrated trolley has an unfolded state and a folded state. The trolley includes a front support 1, a rear support 2, a push rod frame 3, and a linkage frame 5. The lower part of the front support 1 has a front wheel assembly 10, and the lower part of the rear support 2 has a rear wheel assembly 20. The upper parts of the front support 1 and the upper parts of the rear support 2 are rotatably connected about a first axis X1. The push rod frame 3 is rotatably connected to the rear support 2 about a second axis X2. The linkage frame 5 is movably connected between the front support 1 and the push rod frame 3. When the push rod frame 3 rotates backward relative to the rear support 2 to retract, the lower part of the push rod frame 3 moves upward, and the linkage frame 5 is driven by the push rod frame 3 to move relative to the front support 1, thereby causing the front support 1 and the rear support 2 to rotate relative to each other and retract in the front-rear direction. Thus, when folding the trolley, the push rod frame 3 flips backward, allowing the trolley to transition from an unfolded state to a folded state, achieving the folding of the trolley.

[0042] In this embodiment, the trolley is in the unfolded state, and the linkage frame 5 extends approximately in the front-to-back direction. The front part of the linkage frame 5 is rotatably connected to the front support 1 around the third axis X3, and the rear part of the linkage frame 5 is rotatably connected to the lower part of the push rod frame 3 around the fourth axis X4. When the push rod frame 3 rotates and retracts relative to the rear support 2, the lower part of the push rod frame 3 and the rear part of the linkage frame 5 both move upward, thereby driving the front support 1 and the rear support 2 to gradually retract in the front-to-back direction.

[0043] In this embodiment, see Figure 3 , Figure 9As shown, when the trolley is in the unfolded state and the folded state, the aforementioned second axis X2, third axis X3, and fourth axis X4 are all lower than the first axis X1 in the vertical direction. This allows the distance between the second axis X2 and the fourth axis X4 on the push rod frame 3 to be sufficiently small, and the rod segment on the push rod frame 3 located above the second axis X2 to be sufficiently long. When the trolley is in the unfolded state, the push rod frame 3 is usually set to gradually tilt upwards from front to back. Therefore, when the locking mechanism on the trolley is unlocked, the push rod frame 3 can flip backwards relative to the rear support 2 without the need for external force, thereby driving the other rods on the trolley to rotate, so that the trolley can automatically fold or assisted fold by its own weight. This makes the folding operation of the trolley more convenient and labor-saving.

[0044] In this embodiment, with the trolley in its unfolded state, the fourth axis X4 is located between the second axis X2 and the third axis X3, and the fourth axis X4 is vertically lower than the second axis X2. Figure 3 As shown, the line connecting the second axis X2 and the third axis X3 forms the axis connection line L0, and the fourth axis X4 is located below this axis connection line L0. When the trolley transitions from the unfolded state to the folded state, the front support 1, under the action of the push rod frame 3 and the linkage frame 5, first moves away from the rear support 2 and then moves closer to the rear support 2. When the trolley is in the folded state, the push rod frame 3 rotates relative to the rear support 2 around the second axis X2, causing the fourth axis X4 to be higher than the second axis X2 in the vertical direction. Figure 9 As shown, both the push rod frame 3 and the linkage frame 5 can be tightly folded together with the front support 1 and the rear support 2, so that the thickness of the folded trolley is minimized, which helps to make its overall structure flatter and more compact.

[0045] In this embodiment, when the trolley is in the unfolded state, the third axis X3 and the fourth axis X4 are projected onto a vertical plane and connected to form the first connecting line L1. The second axis X2 and the fourth axis X4 are projected onto the same vertical plane and connected to form the second connecting line L2. The angle α between the first connecting line L1 and the second connecting line L2 is between 150° and 180°. That is, when the trolley is in the unfolded state, the extension direction of the linkage frame 5 and the length extension direction of the push rod frame 3 are on the same straight line or close to the same straight line. This further allows the distance between the second axis X2 and the fourth axis X4 to be set sufficiently small. The length of the rod segment behind the second axis X2 on the push rod frame 3 can be much greater than the length of the rod segment in front of the second axis X2. This makes it easier for the push rod frame 4 to flip and retract relative to the rear support 2 by its own weight. At the same time, it also makes the entire push rod frame 4 extend in a straight line, which is more convenient when forming the rod. In this embodiment, the length of the first connecting line L1 is greater than that of the second connecting line L2, and the lines connecting the linkage frame 5 and the push rod frame 3 between the front support 1 and the rear support 2 are smooth, making the overall appearance of the trolley smoother and the structure simpler.

[0046] Referring to the accompanying drawings, the trolley also includes a seat assembly 6, which includes a seat frame 62 and a slider 61. The slider 61 is rotatably mounted on the front support 1. The seat frame 62 is slidably connected to the slider 61 along its own length. The rear part of the seat frame 62 is rotatably connected to the linkage frame 5 or rotatably connected to the push rod frame 3, or the rear part of the seat frame 62, the rear part of the linkage frame 5, and the lower part of the push rod frame 3 are rotatably connected around a fourth axis X4. Specifically, as shown in the figures... Figures 1 to 11 In the illustrated embodiment, the rear part of the seat frame 62, the rear part of the linkage frame 5, and the lower part of the push rod frame 3 are rotatably connected around a fourth axis X4; as shown Figure 12 In another embodiment shown, the rear part of the seat frame 62 is rotatably connected to the lower part of the push rod frame 3 about a fifth axis X5, and the fifth axis X5 is located between the second axis X2 and the fourth axis X4. When the push rod frame 3 flips and retracts relative to the rear support 2 about the second axis X2, the push rod frame 3 drives the rear part of the seat frame 62, or drives the rear part of the seat frame 62 to move upward through the linkage frame 5, thereby causing the seat frame 62 to flip and slide relative to the slider 61, so that the seat frame 62 and the front support 1 retract together.

[0047] The slider 61 is rotatably connected to the front support 1 around the sixth axis X6. Along the length extension direction of the front support 1, the sixth axis X6 is always above the third axis X3. The distance between the sixth axis X6 and the second axis X2 is less than the distance between the sixth axis X6 and the third axis X3. In this way, the seat frame 62 can be in a higher position on the front support 1. At the same time, when the trolley is folded, the seat frame 62 can be folded up to the front side of the linkage frame 5, so that each rod can be folded up in sequence in the front and back direction.

[0048] The trolley also includes a push handle frame 4, the lower part of which is rotatably connected to the upper part of the push rod frame 3 around the seventh axis X7. The projections of the fourth axis X4, the second axis X2, and the seventh axis X7 in the same vertical plane are collinear, meaning that the push rod frame 3 extends along the same straight line. When the trolley is unfolded, the push handle frame 4 and the push rod frame 3 extend along the same length. When the trolley is folded up, the push handle frame 4 and the push rod frame 3 rotate relative to each other to retract, giving the trolley a greater overall weight. After the trolley is unlocked, the push handle frame 4 and the push rod frame 3 can more smoothly flip and retract relative to the rear support 2.

[0049] In this embodiment of the trolley, the components are arranged as follows:

[0050] See Figure 2 As shown, the front support 1 includes two sets of front support rods 11 located on the left and right sides and extending vertically, and a front crossbar 12 fixed between the lower parts of the two sets of front support rods 11 and extending horizontally. Each set of front support rods 11 has a front wheel assembly 10 at its bottom. The rear support 2 includes a rear support body and a connecting end 22 protruding from the rear support body towards the front support 1. Here, the rear support body includes two sets of rear support rods 21 located on the left and right sides and extending vertically, and a rear crossbar 22 fixed between the lower parts of the two sets of rear support rods 21 and extending horizontally. A rear wheel assembly 20 is connected to each of the left and right sides of the rear crossbar 22. Each set of rear support rods 21 has a connecting end 22 at its upper part. When the trolley is in the unfolded state, the connecting end 22 has a certain distance from the top of the rear support rod 21, and the connecting end 22 extends downwards and forwards from the rear support rod 21.

[0051] The push rod frame 3 includes two sets of push rods 31 located on the left and right sides and extending vertically. The push handle frame 4 includes a U-shaped push handle, with the lower ends of the push handle on both sides rotatably connected to the upper ends of the two sets of push rods 31. The linkage frame 5 includes two linkage rods 51 located on the left and right sides. The seat frame 62 in the seat assembly 6 is a U-shaped rod with its opening facing rearward. The sliding element 61 is specifically a sliding sleeve, with a sliding element 61 slidably fitted on each of the two side rods of the U-shaped rod of the seat frame 62. On each side of the trolley, the upper part of the front support rod 11 is rotatably connected to the upper part of the rear support rod 21, the push rod 31 is rotatably connected to the lower end of the connecting end 22, and the linkage rod 51 is rotatably connected between the lower parts of the front support rod 11 and the push rod 31. A sliding element 61 is rotatably connected to the front support rod 11 on each side, and the seat frame 62 is slidably connected to the sliding elements 61 on both sides and rotatably connected to the push rods 31 on both sides.

[0052] See Figures 1 to 3 As shown, in this embodiment, the trolley is in its unfolded state. The front support 1 and the rear support 2 unfold relative to each other in the front-to-back direction and are supported on the ground by the front wheel assembly 10 and the rear wheel assembly 20. The push rod frame 3 and the push handle frame 4 unfold relative to each other and extend gradually upwards from front to back along the same length direction. The linkage frame 5 connects the lower parts of the front support 1 and the push rod frame 3 and extends backwards and upwards. The overall appearance of the trolley is simple. When the trolley needs to be folded up, the push handle frame 4 is first flipped and folded relative to the push rod frame 3, as shown. Figure 4 , Figure 5 As shown; then, the operator can release the lever bracket 3 and the push handle bracket 4, under their own weight, flip backward relative to the rear support 2. The lower part of the lever bracket 3 moves upward, causing the rear part of the linkage bracket 5 to move upward, and causing the linkage bracket 5 to rotate relative to the front support 1. This causes the front support 1 and the rear support 2 to rotate relative to each other and move closer together in the front-back direction, as shown. Figure 6 , Figure 7 As shown, during this process, the rear of the seat frame 62 moves upward and slides relative to the slider 61 and rotates relative to the front support 1; finally, the front support 1, rear support 2, push rod frame 3, and push handle frame 4 are retracted together in the front-rear direction, and the seat frame 62 and linkage frame 5 are retracted between the front support 1 and the rear support 2, as shown. Figures 8 to 11 As shown. In a specific setup, a carrying strap can also be installed at the rotatable connection point on the upper part of the front support 1 and the rear support 2, so that the trolley can be folded as shown... Figure 6 , Figure 7 Once the folding mechanism is activated, the operator can lift the trolley upwards using the straps to fold it up. This makes it more convenient for daily use, especially when only one hand is available to fold the trolley. The folding convenience of this trolley brings great convenience to the user.

[0053] It is understood that the same or similar parts in the above embodiments can be referred to each other, and the contents not described in detail in some embodiments can be referred to the same or similar contents in other embodiments.

[0054] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art. In the event of any contradiction or inconsistency between the definitions used herein and those contained in other published documents, the definitions used herein shall prevail.

[0055] It should also be noted that "rotational connection" in the above embodiments refers to pivot connection, unless the context clearly indicates other rotational connection methods.

[0056] As indicated in this specification and claims, the terms "comprising" and "including" only indicate the inclusion of explicitly identified steps and elements, and these steps and elements do not constitute an exclusive list, and the method or apparatus may also include other steps or elements.

[0057] It can be further understood that in this disclosure, "multiple" refers to two or more, and other quantifiers are similar. "And / or" describes the relationship between related objects, indicating that three relationships can exist; for example, A and / or B can represent: A alone, A and B simultaneously, and B alone. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship. The singular forms "a," "the," and "the" are also intended to include the plural forms unless the context clearly indicates otherwise.

[0058] It is further understood that the terms "first," "second," etc., are used to describe various types of information, but this information should not be limited to these terms. These terms are only used to distinguish information of the same type from one another, and do not indicate a specific order or degree of importance. In fact, the expressions "first," "second," etc., are completely interchangeable. For example, without departing from the scope of this disclosure, first information can also be referred to as second information, and similarly, second information can also be referred to as first information.

[0059] The above embodiments are only for illustrating the technical concept and features of this utility model, and are intended to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. All equivalent changes or modifications made based on the essence of this utility model should be covered within the scope of protection of this utility model.

Claims

1. A trolley having an unfolded state and a folded state, characterized in that: The trolley includes a front support, a rear support, a push rod frame, and a linkage frame. The upper part of the front support is rotatably connected to the upper part of the rear support about a first axis. The push rod frame is rotatably connected to the rear support about a second axis. The linkage frame is movably connected between the lower parts of the front support and the push rod frame, so that when the push rod frame rotates and retracts relative to the rear support, the linkage frame is driven by the upward movement of the lower part of the push rod frame, causing the front support and the rear support to retract relative to each other in the front-rear direction.

2. The trolley according to claim 1, characterized in that: The front part of the linkage frame is rotatably connected to the front support around the third axis, and the rear part of the linkage frame is rotatably connected to the lower part of the push rod frame around the fourth axis. When the push rod frame rotates and retracts relative to the rear support, the lower part of the push rod frame and the rear part of the linkage frame both move upward, causing the front support and the rear support to retract in the front-rear direction.

3. The trolley according to claim 2, characterized in that: When the trolley is in the unfolded state and in the folded state, the second axis, the third axis, and the fourth axis are all lower than the first axis in the vertical direction.

4. The trolley according to claim 2, characterized in that: When the trolley is in the unfolded state, the fourth axis is lower than the second axis in the vertical direction; when the trolley is in the folded state, the fourth axis is higher than the second axis. When the trolley is in the unfolded state, the line connecting the third axis and the second axis forms an axis line, and the fourth axis is located below the axis line. When the trolley is transitioning from the unfolded state to the folded state, the front support first moves away from the rear support and then moves closer to the rear support.

5. The trolley according to claim 2, characterized in that: The third axis and the fourth axis are projected into a vertical plane and then connected to form a first line. The second axis and the fourth axis are projected into the vertical plane and then connected to form a second line. The angle between the first line and the second line is 150° to 180°. The push rod frame extends in a straight line as a whole.

6. The trolley according to claim 2, characterized in that: The trolley also includes a seat assembly, which includes a seat frame and a sliding member. The sliding member is rotatably mounted on the front support. The seat frame is slidably connected to the sliding member along its own length. The rear part of the seat frame is rotatably connected to the linkage frame or the push rod frame, or the rear part of the seat frame, the rear part of the linkage frame, and the lower part of the push rod frame are rotatably connected around the fourth axis.

7. The trolley according to claim 6, characterized in that: The rear part of the seat frame is rotatably connected to the push rod frame about a fifth axis, and the fifth axis is located between the second axis and the fourth axis along the length extension direction of the push rod frame.

8. The trolley according to claim 6, characterized in that: The slider is rotatably connected to the front bracket about a sixth axis, wherein the sixth axis is always located above the third axis along the length extension direction of the front bracket, and / or the distance between the sixth axis and the second axis is less than the distance between the sixth axis and the third axis.

9. The trolley according to claim 6, characterized in that: The trolley also includes a push handle frame, the lower part of which is rotatably connected to the upper part of the push rod frame around a seventh axis, wherein the fourth axis, the second axis, and the seventh axis are collinear in projection onto the same vertical plane.

10. The trolley according to claim 2, characterized in that: The rear support includes a rear support body and a connecting end protruding from the rear support body toward the front support. The rear support body is rotatably connected to the upper part of the front support about the first axis. The push rod frame is rotatably connected to the connecting end about the second axis. In the unfolded state, the second axis is located in front of the rear support body. The distance between the third axis and the fourth axis is greater than the distance between the fourth axis and the second axis.

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