stroller

Abstract

The present application relates to a stroller, comprising: a handlebar frame including a pivotally connected upper handlebar frame and a lower handlebar frame; a canopy mechanism pivotally arranged relative to the lower handlebar frame and coupled with the upper handlebar frame; and a locking mechanism arranged between the canopy mechanism and the lower handlebar frame to restrict or allow the canopy mechanism to pivot relative to the lower handlebar frame; during pivoting of the upper handlebar frame relative to the lower handlebar frame, the upper handlebar frame is capable of causing the canopy mechanism to fold or unfold and driving the locking mechanism to be unlocked to cause the canopy mechanism to pivot towards the lower handlebar frame or away from the lower handlebar frame.

Description

Technical Field

[0001] This application relates to the field of infant and toddler vehicles, and in particular to a stroller. Background Technology

[0002] Strollers are a commonly used tool in the field of infant and toddler transportation. To provide a comfortable and safe riding environment for infants and toddlers, strollers are usually equipped with an adjustable canopy mechanism to provide functions such as sunshade, rain protection, and wind protection, meeting the needs of different usage scenarios. However, in most strollers currently on the market, the canopy mechanism cannot complete the corresponding action in sync with the stroller as a whole when folding or unfolding, requiring manual folding or unfolding separately. This operation method not only increases the steps and difficulty for users, making the operation complex and cumbersome, but also reduces the convenience and efficiency of use to some extent. Summary of the Invention

[0003] Therefore, it is necessary to provide a trolley to address the above problems.

[0004] This application provides a trolley, characterized in that it comprises: a handlebar, including an upper handlebar and a lower handlebar pivotally connected; a canopy mechanism, pivotable relative to the lower handlebar and coupled to the upper handlebar; and a locking mechanism disposed between the canopy mechanism and the lower handlebar to restrict or allow the canopy mechanism to pivot relative to the lower handlebar; during the pivoting of the upper handlebar relative to the lower handlebar, the upper handlebar can drive the canopy mechanism to retract or expand, and drive the locking mechanism to release, thereby causing the canopy mechanism to pivot toward or away from the lower handlebar.

[0005] In one embodiment, when the upper frame pivots toward the lower frame, the upper frame drives the canopy mechanism to retract, and the retracted canopy mechanism pivots toward the lower frame as the upper frame pivots; or

[0006] When the upper frame pivots away from the lower frame, the upper frame drives the canopy mechanism to open, and the opened canopy mechanism pivots away from the lower frame as the upper frame pivots.

[0007] In one embodiment, the canopy mechanism includes a connected support base and a first canopy strip, the support base being pivotable about a rotation axis relative to the lower scaffold, so that the first canopy strip is pivotable relative to the lower scaffold; the pivoting process of the upper scaffold relative to the lower scaffold includes a first stage and a second stage, in the first stage, the support base and the first canopy strip are fixed relative to the lower scaffold; in the second stage, the pivoting of the upper scaffold drives the first canopy strip to pivot in a direction closer to or farther from the lower scaffold.

[0008] In one embodiment, the canopy mechanism has an open state and a retracted state; the canopy mechanism further includes a second canopy strip, the second canopy strip being fixed relative to the upper frame, and the second canopy strip being pivotable with the upper frame relative to the lower frame; when the canopy mechanism is in the open state, the first canopy strip and the second canopy strip are far apart from each other, and when the canopy mechanism is in the retracted state, the first canopy strip and the second canopy strip are close together.

[0009] In one embodiment, the width of the first canopy strip along the first direction is W1, the width of the second canopy strip along the first direction is W2, and the width of the upper frame along the first direction is W3, wherein W1 > W3 > W2.

[0010] In one embodiment, the frame further includes a first pivot joint, the first pivot joint including a first connecting seat and a second connecting seat pivotally connected to each other, the first connecting seat being connected to the upper frame, the second connecting seat being connected to the lower frame, and the support seat being rotatably disposed about the rotation axis on the side of the second connecting seat opposite to the first connecting seat.

[0011] In one embodiment, the locking mechanism includes an engaging protrusion and an engaging recess. One of the support base and the second connecting base is provided with the engaging recess, and the other is provided with the engaging protrusion. When the engaging protrusion extends into the engaging recess, the support base is restricted from rotating relative to the second connecting base. When the engaging protrusion disengages from the engaging recess, the support base is allowed to rotate relative to the second connecting base.

[0012] In one embodiment, multiple engagement recesses are provided, and the multiple engagement recesses are circumferentially spaced along the rotation axis; in the first stage, the engagement protrusion remains inserted into the current engagement recess, and in the second stage, the engagement protrusion can sequentially disengage from the current engagement recess and extend into the adjacent engagement recess, so as to restrict the continuous rotation of the support relative to the second connecting seat.

[0013] In one embodiment, the support seat is axially movable relative to the second connecting seat along the rotation axis to have a first position and a second position; when the support seat is in the first position, the engaging protrusion extends into the engaging recess; when the support seat is in the second position, the engaging protrusion disengages from the engaging recess; in the first stage, the support seat remains in the first position, and in the second stage, the support seat reciprocates between the first position and the second position.

[0014] In one embodiment, the rider frame further includes: a cover disposed on the side of the support away from the second connecting seat and connected to the second connecting seat, and a movable gap is provided between the cover and the support seat for axial movement of the support seat along the rotation axis; and a first elastic member disposed in the movable gap and abutting between the cover and the support seat to drive the support seat to remain in the first position.

[0015] In one embodiment, the engaging recess and / or the engaging protrusion are provided with a guide slope. When the support seat rotates relative to the second connecting seat, the engaging protrusion pushes against the engaging recess through the guide slope, driving the support seat to switch from the first position to the second position.

[0016] In one embodiment, one of the support base and the second connecting base having the engaging recess also has a locking recess, the locking recess being adapted to lock into the engaging protrusion, wherein the size of the locking recess is different from the size of the engaging recess.

[0017] In one embodiment, the locking recess and / or the engaging protrusion are provided with a sliding ramp, and the engaging protrusion abuts against the locking recess through the sliding ramp to disengage the engaging protrusion from the locking recess.

[0018] In one embodiment, one of the second connecting seat and the support seat is provided with a limiting rib, and the other is provided with a limiting groove. The limiting rib can extend into the limiting groove in a direction parallel to the rotation axis. When the engaging protrusion disengages from the engaging recess, the limiting member disengages from the limiting groove.

[0019] In one embodiment, one of the second connecting seat and the support seat has a limiting rib, and the other has a limiting groove. The limiting rib is kept extending into the limiting groove in a direction parallel to the rotation axis, and the end of the limiting groove restricts the rotational stroke of the support seat relative to the second connecting seat.

[0020] In one embodiment, one of the support base and the second connecting base having the engaging recess also has a locking recess, the locking recess being adapted to lock into the engaging protrusion; the locking recess is disposed opposite to the end of the limiting groove along the radial direction of the rotation axis.

[0021] In one embodiment, the locking mechanism includes a bracket, a locking protrusion, and a locking recess. The bracket is axially movably disposed between the second connecting seat and the support seat along the rotation axis, and the bracket is restricted from rotating relative to the second connecting seat. One of the support seat and the bracket is provided with the locking recess, and the other is provided with the locking protrusion. When the locking protrusion extends into the locking recess, the support seat is restricted from rotating relative to the second connecting seat. When the locking protrusion disengages from the locking recess, the support seat is allowed to rotate relative to the second connecting seat.

[0022] In one embodiment, multiple engagement recesses are provided, and the multiple engagement recesses are circumferentially spaced along the rotation axis; in the first stage, the engagement protrusion remains inserted into the current engagement recess, and in the second stage, the engagement protrusion can sequentially disengage from the current engagement recess and extend into the adjacent engagement recess, so as to restrict the continuous rotation of the support relative to the second connecting seat.

[0023] In one embodiment, the locking mechanism further includes a positioning recess, the second connecting seat having the positioning recess; the bracket having the engaging protrusion, and the bracket having a third position and a fourth position; the support seat having the engaging recess; when the bracket is in the third position, the engaging protrusion engages with both the engaging recess and the positioning recess simultaneously to restrict the support seat from rotating relative to the second connecting seat; when the bracket is in the fourth position, the engaging protrusion engages with the positioning recess and disengages from the engaging recess to allow the support seat to rotate relative to the second connecting seat.

[0024] In one embodiment, the engaging recess and / or the engaging protrusion are provided with a guide slope. When the support seat rotates relative to the second connecting seat, the engaging protrusion pushes against the engaging recess through the guide slope, driving the bracket to switch from the third position to the fourth position.

[0025] In one embodiment, a second elastic element is provided between the bracket and the second connecting seat, the second elastic element driving the bracket to remain in the third position.

[0026] In one embodiment, one of the second connecting seat and the bracket is further provided with a limiting protrusion and the other is further provided with a limiting recess. The limiting protrusion engages with the limiting recess to restrict the bracket from rotating relative to the second connecting seat.

[0027] In one embodiment, the scaffolding further includes a locking and retaining mechanism disposed between the upper scaffolding and the lower scaffolding. When the upper scaffolding pivots relative to the lower scaffolding to fold, the locking and retaining mechanism is adapted to lock the upper scaffolding and the lower scaffolding to restrict the upper scaffolding from unfolding relative to the lower scaffolding.

[0028] This application also provides a trolley, comprising: a handframe; a canopy mechanism rotatably disposed on the handframe; and a locking mechanism disposed between the handframe and the canopy mechanism for limiting continuous rotation of the canopy mechanism relative to the handframe. Attached Figure Description

[0029] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute an undue limitation of this application.

[0030] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0031] Furthermore, the accompanying drawings are not drawn to a 1:1 scale, and the relative dimensions of the various components are shown as examples only and not necessarily to scale. In the accompanying drawings:

[0032] Figure 1 This is a side view of a trolley according to an embodiment of the present application, wherein the canopy mechanism is in the extended state;

[0033] Figure 2 This is a side view of a trolley according to one embodiment of the present application, wherein the canopy mechanism is between an open state and a retracted state;

[0034] Figure 3 This is a side view of a trolley in one embodiment of the present application, wherein the trolley is between an unfolded state and a folded state, and the canopy mechanism is close to a retracted state;

[0035] Figure 4 This is a side view of a trolley in one embodiment of the present application, wherein the trolley is in a folded state and the canopy mechanism is in a retracted state;

[0036] Figure 5 This is a side view of the rider frame in one embodiment of this application, wherein the rider frame is extended and the canopy mechanism is in a retracted state;

[0037] Figure 6 for Figure 5 The front view of the rider's frame shown;

[0038] Figure 7 This is a perspective view of the rider's frame in the first embodiment of this application;

[0039] Figure 8 for Figure 7 An exploded view of the rider's frame is shown.

[0040] Figure 9 for Figure 8 Enlarged view of the structure at point A in the middle circle;

[0041] Figure 10 for Figure 9 Enlarged view of the structure at point B in the middle circle;

[0042] Figure 11 for Figure 9 Enlarged view of the structure at point C in the middle circle;

[0043] Figure 12 for Figure 5 A cross-sectional view along line U1-U1, with the support seat in the first position;

[0044] Figure 13 for Figure 7 A cross-sectional view along line U2-U2, with the support in the second position;

[0045] Figure 14 This is a side view of the rider frame in the first embodiment of this application, wherein the rider frame is unfolded and the canopy mechanism is in the extended state;

[0046] Figure 15 This is a side view of the rider frame in the first embodiment of this application, wherein the rider frame is between unfolded and folded, and the canopy mechanism is close to the folded state;

[0047] Figure 16 This is a side view of the trolley in the first embodiment of this application, wherein the trolley is in a folded state and the cover is omitted in the figure;

[0048] Figure 17 for Figure 1 A sectional view along line U3-U3, omitting the wheel frame;

[0049] Figure 18 This is a perspective view of the support seat in the trolley in the second embodiment of this application;

[0050] Figure 19This is a side view of the rider frame in the second embodiment of this application, wherein the rider frame is unfolded and the canopy mechanism is in the extended state;

[0051] Figure 20 This is an exploded view of the handframe of the trolley in the third embodiment of this application;

[0052] Figure 21 This is a cross-sectional view of the handframe of the trolley in the third embodiment of this application;

[0053] Figure 22 This is a perspective view of the trolley in the fourth embodiment of this application;

[0054] Figure 23 for Figure 22 A sectional view along line U4-U4;

[0055] Figure 24 This is a cross-sectional view of the trolley in the fourth embodiment of this application, wherein the trolley is in a folded state;

[0056] Figure 25 for Figure 22 Exploded view of some parts of the trolley;

[0057] Figure 26 for Figure 25 Enlarged view of the structure at point D in the middle circle;

[0058] Figure 27 This is a partial exploded view of the trolley frame in the fifth embodiment of this application;

[0059] Figure 28 for Figure 27 A sectional view along line U5-U5 of the first pivot joint;

[0060] Figure 29 for Figure 27 A perspective view of the upper frame of the rig when it is in the folded position.

[0061] Figure 30 for Figure 29 A sectional view along line U6-U6, omitting the rider's frame.

[0062] Explanation of reference numerals in the attached figures:

[0063] 10. Cart; 100. Cart frame; 110. Loading frame; 120. Unloading frame; 130. First pivot joint; 131. First connecting seat; 1311. First chamber; 1312. First locking groove; 131a. First pivot part; 131b. First connecting part; 131c. Moving channel; 1311c. Limiting step; 132. Second connecting seat; 1321. Limiting rib; 1322. Limiting recess; 1323. Second chamber; 132a. Second pivot part; 132b. Second connecting part; 133. Locking Components; 1331, Locking tooth; 1332, Drive unit; 134, Drive component; 135, Fourth elastic component; 136, Fixing component; 140, Cover; 150, First elastic component; 200, Wheel frame; 210, Front wheel frame; 220, Rear wheel frame; 300, Canopy mechanism; 310, Support base; 311, Limiting groove; 3111, First end; 3112, Second end; 320, First canopy strip; 330, Second canopy strip; 340, Third canopy strip; 350, Canopy fabric; 400, Locking mechanism; 410, Engaging protrusion Part; 411, Guide ramp; 412, Sliding ramp; 420, Engaging recess; 420a, First engaging recess; 420b, Second engaging recess; 420c, Third engaging recess; 421, Guide ramp; 440, Bracket; 441, Limiting protrusion; 450, Positioning recess; 460, Locking recess; 461, Sliding ramp; 500, Second pivot joint; 610, Pushing gap; 620, Movement gap; 700, Locking and retaining mechanism; 710, Retaining member; 711, First rod; 712, Second rod; 713, Third lever; 714, Lock head; 715, Hanging part; 720, Retaining recess; 721, Guide slope; 730, Third elastic element; 740, Mounting bracket; 800, Second elastic element; 900, Release mechanism; S1, Rotation axis; Q1, First pivot point; Q2, Second pivot point; F1, First direction; F2, Second direction; F3, Third direction; α1, First included angle; α2, Second included angle; α3, Third included angle; α4, Fourth included angle; α5, Fifth included angle; α6, Sixth included angle; α0, Central angle. Detailed Implementation

[0064] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0065] Some embodiments of this application provide a stroller 10, which has a generally symmetrical structure and can be used as a children's stroller, pet stroller, or cargo stroller. For example, in this embodiment, the stroller 10 is used as a children's stroller to illustrate its structure and working principle.

[0066] Please see Figures 1 to 4 In one embodiment, the trolley 10 may include, for example, a handlebar 100 and a wheel frame 200, the handlebar 100 and the wheel frame 200 being pivotally connected to each other so that the trolley 10 can be in an unfolded state (see...). Figure 1 ) and folded state (see Figure 4 Switching between the two. The wheel frame 200 includes a front wheel frame 210 and a rear wheel frame 220, which can be pivotally connected to each other at a second pivot point Q2; or, they can also be pivotally connected to the second pivot point Q2 via a second pivot joint 500. The rider frame 100 can be pivotally connected to either the front wheel frame 210 or the rear wheel frame 220 individually. Of course, the rider frame 100 can also be pivotally connected to both the front wheel frame 210 and the rear wheel frame 220 simultaneously, without specific limitations. In this embodiment, the rider frame 100 is pivotally connected to the front wheel frame 210 and the rear wheel frame 220 via the second pivot joint 500; in other words, the rider frame 100, the front wheel frame 210, and the rear wheel frame 220 are pivotally connected to the second pivot point Q2. Figure 1 As shown, when the trolley 10 is in the unfolded state, the handlebar frame 100, the front wheel frame 210, and the rear wheel frame 220 are circumferentially spaced around the second pivot joint 500, with the rear wheel frame 220 positioned between the front wheel frame 210 and the handlebar frame 100. A first angle α1 is formed between the front wheel frame 210 and the rear wheel frame 220, a second angle α2 is formed between the handlebar frame 100 and the rear wheel frame 220, and a third angle α3 is formed between the handlebar frame 100 and the front wheel frame 210. Figure 4 As shown, when the trolley 10 is in the folded state, the rear wheel frame 220 and the front wheel frame 210 are close together, forming a fourth angle α4 between them. The handlebar frame 100 is close to the rear wheel frame 220, forming a fifth angle α5 between it and the rear wheel frame 220. The handlebar frame 100 and the front wheel frame 210 form a sixth angle α6, where α1 > α4, α2 > α5, and α3 > α6. Therefore, when the trolley 10 is needed, it can be unfolded. When the trolley 10 needs to be stored, it can be folded to save space and facilitate storage.

[0067] In one embodiment, such as Figures 1 to 4As shown, the trolley frame 100 includes an upper frame 110 and a lower frame 120 pivotally connected at a first pivot point Q1. The end of the lower frame 120 away from the upper frame 110 is connected to a second pivot joint 500. The trolley frame 100 is designed as a foldable structure, which allows the trolley 10 to have a smaller folded volume when folded. In this embodiment, when the trolley 10 is in the unfolded state, the lower frame 120 forms the aforementioned second included angle α2 with the rear wheel frame 220, and the lower frame 120 forms the aforementioned third included angle α3 with the front wheel frame 210. The included angle between the upper frame 110 and the lower frame 120 is 180°, and they can be considered to be on the same plane (see...). Figure 1 Of course, in other embodiments, when the trolley 10 is in the unfolded state, the angle between the upper handle 110 and the lower handle 120 may be greater than 180° or less than 180°, and no specific limitation is made here. Specifically, when the trolley 10 switches from the unfolded state to the folded state, the upper handle 110 pivots relative to the lower handle 120 and folds towards the lower handle 120, while the lower handle 120 pivots around the second pivot joint 500 to fold towards the rear wheel frame 220. When the trolley 10 switches from the folded state to the unfolded state, the upper handle 110 pivots relative to the lower handle 120 to move away from the lower handle 120, while the lower handle 120 pivots around the second pivot joint 500 to move away from the rear wheel frame 220.

[0068] Please see Figures 1 to 6 In some embodiments, the trolley 10 also includes a canopy mechanism 300 and a locking mechanism 400 (see...). Figure 9 (See below for specific structure). The canopy mechanism 300 is pivotable relative to the lower frame 120 and is linked to the upper frame 110. A locking mechanism 400 is disposed between the canopy mechanism 300 and the lower frame 120 to restrict or allow the canopy mechanism 300 to pivot relative to the lower frame 120. During the pivoting of the upper frame 110 relative to the lower frame 120, the upper frame 110 can cause the canopy mechanism 300 to retract or expand, and apply external force to the canopy mechanism 300 to release the locking mechanism 400, thereby causing the canopy mechanism 300 to pivot towards or away from the lower frame 120.

[0069] Please continue reading Figures 1 to 6In one embodiment, the canopy mechanism 300 includes a connected support base 310 and a first canopy strip 320. The support base 310 is connected to the frame 100 and is rotatable about a rotation axis S1 relative to the lower frame 120, so that the first canopy strip 320 can pivot relative to the lower frame 120. In one embodiment, the canopy mechanism 300 further includes a second canopy strip 330, which is fixed relative to the upper frame 110 and is pivotable with the upper frame 110 relative to the lower frame 120. In this embodiment, the canopy mechanism 300 has an open state and a retracted state. Specifically, as... Figure 1 As shown, when the canopy mechanism 300 is in the open state, the first canopy strip 320 and the second canopy strip 330 are far apart. Figure 4 and Figure 5 As shown, when the canopy mechanism 300 is in the retracted state, the first canopy strip 320 and the second canopy strip 330 are close to each other. Specifically, when the canopy mechanism 300 is in the extended state, the angle between the first canopy strip 320 and the second canopy strip 330 is greater than the angle between the first canopy strip 320 and the second canopy strip 330 when the canopy mechanism 300 is in the retracted state.

[0070] It should be noted that the aforementioned "second canopy strip 330 remaining fixed relative to the upper frame 110" can be achieved in various ways. For example, the second canopy strip 330 can be directly fixed to the upper frame 110. Alternatively, the second canopy strip 330 can be indirectly connected to the upper frame 110 through other components (such as the first connecting seat 131). No specific limitations are imposed here.

[0071] Please see Figures 1 to 3 In one embodiment, the canopy mechanism 300 further includes a canopy 350 connected between the first canopy strip 320 and the second canopy strip 330. For example... Figure 1 As shown, when the canopy mechanism 300 is in the open state, the second canopy strip 330 and the first canopy strip 320 are separated, and the canopy 350 is fully extended between the first canopy strip 320 and the second canopy strip 330. At this time, the canopy 350 forms a certain area of ​​shade to block sunlight or rain, providing a good riding environment for children. Figure 3 and Figure 5 As shown, when the canopy mechanism 300 is in the retracted state, the second canopy strip 330 and the first canopy strip 320 approach each other, and the canopy 350 is retracted and stacked between the first canopy strip 320 and the second canopy strip 330. In this embodiment, as... Figure 4 As shown, when the trolley 10 is in the folded state, the canopy mechanism 300 is in the retracted state, which helps to reduce the space occupied by the trolley 10 and makes the trolley 10 have a smaller overall folded volume. Figure 1As shown, when the stroller 10 is in the unfolded state, the canopy mechanism 300 can be in the open state. The canopy mechanism 300 can effectively play the functions of sunshade, rain protection, and wind protection to improve the comfort of children when riding in the stroller 10.

[0072] In one embodiment, the pivoting process of the upper frame 110 relative to the lower frame 120 includes a first stage and a second stage. For example, when the trolley 10 is in the unfolded state and the canopy mechanism 300 is in the extended state, during the process of pivoting the upper frame 110 relative to the lower frame 120 to fold the frame 100, see [reference needed]. Figures 1 to 3 In the first stage, the second canopy strip 330 rotates together with the upper frame 110 to approach the lower frame 120. During this process, under the locking action of the locking mechanism 400 (see below for the specific principle), the first canopy strip 320 and the support seat 310 remain fixed relative to the lower frame 120. As the second canopy strip 330 gradually approaches the first canopy strip 320, the taut tarpaulin 350 gradually loses tension and loosens as the distance between the two canopy strips decreases, naturally gathering between the first and second canopy strips 320 until the canopy mechanism 300 is in the gathered state. See also Figure 3 and Figure 4In the second stage, the canopy mechanism 300 remains in the retracted state while the upper frame 110 continues to rotate. The upper frame 110 drives the entire canopy mechanism 300 to pivot towards the lower frame 120. That is, the continuous pivoting of the upper frame 110 applies an external force (specifically, a thrust) to the first canopy strip 320, driving the first canopy strip 320 to pivot towards the lower frame 120 until the upper frame 110 is completely retracted relative to the lower frame 120. In other words, when the upper frame 110 pivots towards the lower frame 120, the upper frame 110 first drives the canopy mechanism 300 to retract, and the retracted canopy mechanism 300 will pivot towards the lower frame 120 along with the pivoting of the upper frame 110. For example, when the trolley 10 is in a folded state and the canopy mechanism 300 is in a retracted state, during the process of the upper frame 110 pivoting relative to the lower frame 120 to unfold the trolley 100, in the first stage, the second canopy strip 330 will rotate together with the upper frame 110 to move away from the lower frame 120. During this process, under the locking action of the locking mechanism 400, the first canopy strip 320 and the support seat 310 remain fixed relative to the lower frame 120. As the second canopy strip 330 gradually moves away from the first canopy strip 320, the slack tarpaulin 350 will gradually tighten as the distance between the two canopy strips increases until it is fully unfolded, so that the canopy mechanism 300 is in an open state. In the second stage, the canopy mechanism 300 remains in the extended state while the upper frame 110 continues to rotate. The upper frame 110 drives the entire canopy mechanism 300 to pivot away from the lower frame 120. That is, the continuous pivoting of the upper frame 110 applies an external force (specifically a tension force) to the first canopy strip 320, driving it to pivot away from the lower frame 120 until the upper frame 110 is fully extended relative to the lower frame 120. In other words, when the upper frame 110 pivots away from the lower frame 120, it first drives the canopy mechanism 300 to extend, and the extended canopy mechanism 300 then pivots away from the lower frame 120 along with the pivoting of the upper frame 110. As can be seen, in this embodiment, the canopy mechanism 300 can be driven to move synchronously to open or close the trolley 10, regardless of whether the trolley 10 is folded or unfolded. The user does not need to manually operate the canopy mechanism 300 separately. This design simplifies the operation process of unfolding or folding the trolley 10 and effectively improves the convenience and efficiency of using the trolley 10.

[0073] It should be noted that the first canopy strip 320 can only drive the support 310 to pivot relative to the lower frame 120 when the external force applied is greater than the locking force exerted by the locking mechanism 400 on the lower frame 120 and the support 310, thereby realizing the action of moving closer to or away from the lower frame 120.

[0074] In one embodiment, besides the stroller 10 driving the canopy mechanism 300 to switch between open and closed states simultaneously during folding or unfolding, the user can also operate the canopy mechanism 300 independently when the stroller 10 is in the unfolded state, allowing the canopy mechanism 300 to switch between open and closed states. Specifically, in this embodiment, when the stroller 10 is in the unfolded state and the canopy mechanism 300 is in the open state, the canopy mechanism 300 can provide sunshade, rain protection, and wind protection. In this case, if the user wishes to fold the canopy mechanism 300 to expand the child's field of vision while riding in the stroller 10, they only need to apply a force (such as a pushing or pulling force) directly to the first canopy strip 320 to rotate it towards the second canopy strip 330. Conversely, when the trolley 10 is in the extended state and the canopy mechanism 300 is in the retracted state, if the user wishes to extend the canopy mechanism 300, they only need to apply a force (such as a pushing or pulling force) directly to the first canopy strip 320 to rotate it away from the second canopy strip 330. Similarly, it should be noted that only when the applied force is greater than the locking force exerted by the locking mechanism 400 on the lower frame 120 and the support seat 310, can the first canopy strip 320 drive the support seat 310 to pivot relative to the lower frame 120, thereby achieving the action of moving closer to or away from the upper frame 110.

[0075] Please see Figures 1 to 3 In one embodiment, the canopy mechanism 300 may further include at least one third canopy strip 340, which is disposed between the first canopy strip 320 and the second canopy strip 330 to provide good support. Specifically, by providing the third canopy strip 340, the canopy area between the first canopy strip 320 and the second canopy strip 330 can be more effectively supported. This support not only helps to enhance the structural stability of the entire tarpaulin 350 and reduce deformation and collapse of the tarpaulin 350, but also makes the tarpaulin 350 flatter when it is opened, which is beneficial to improving the aesthetics and practicality of the canopy mechanism 300 when it is in the opened state.

[0076] It should be noted that the third canopy strip 340 is usually covered by the tarpaulin 350, therefore, it is generally not visible from the outside of the tarpaulin 350. In this embodiment, to clearly show the location of the third canopy strip 340, it is shown as a dashed line in the relevant figures.

[0077] Please see Figure 6In one embodiment, the width of the first canopy strip 320 along the left-right direction (i.e., the first direction F1) of the trolley 10 is W1, the width of the second canopy strip 330 along the first direction F1 is W2, and the width of the upper frame 110 along the first direction F1 is W3. Wherein, W1 > W3 > W2. By setting the widths in this way, favorable conditions are created for the rapid unfolding or retraction of the canopy mechanism 300, making the unfolding or retraction process smoother and more efficient. At the same time, this width setting helps ensure that the canopy mechanism 300 presents a harmonious and aesthetically pleasing visual effect.

[0078] It should be noted that, unless otherwise explicitly specified and limited, the directional terms such as "left" and "right" used in the various embodiments of the present invention refer to the "left" and "right" positions of the cart 10 during normal operation, and the "left" and "right" directions are schematically indicated by arrows L and R in the figures. These directional terms are only used to make the description of the embodiments of the present invention clearer and are not intended to unduly limit the scope of protection of the present invention.

[0079] Please see Figures 6 to 8 In one embodiment, the frame 100 further includes a first pivot joint 130. The upper frame 110 is pivotally connected to the lower frame 120 via the first pivot joint 130, and the end of the lower frame 120 away from the first pivot joint 130 is connected to a second pivot joint 500. A support base 310 is rotatably disposed on the first pivot joint 130 about a rotation axis S1. In other words, the support base 310 is disposed on the first pivot joint 130 and can rotate relative to the first pivot joint 130 about a rotation axis S1. Specifically, in this embodiment, the first pivot joint 130 includes a first connecting seat 131 and a second connecting seat 132 pivotally connected to each other. Specifically, the first connecting seat 131 and the second connecting seat 132 are pivotally connected to a first pivot point Q1. The first connecting seat 131 is connected to the upper frame 110, and the second connecting seat 132 is connected to the lower frame 120. The support base 310 is rotatably disposed on the side of the second connecting base 132 away from the first connecting base 131 around the rotation axis S1, and the locking mechanism 400 is disposed between the second connecting base 132 and the support base 310.

[0080] It should be noted that in this embodiment, the second canopy strip 330 is connected to the first connecting seat 131. Therefore, when the first connecting seat 131 rotates relative to the second connecting seat 132, the upper frame 110 and the second canopy strip 330 will rotate together around the first pivot point Q1 relative to the lower frame 120. Furthermore, in this embodiment, the first pivot point Q1 is coaxially arranged with the rotation axis S1. This can be understood as the first connecting seat 131, the second connecting seat 132, and the support seat 310 being pivotally connected to the same pivot axis. Of course, in other embodiments, the first pivot point Q1 may also be offset from the rotation axis S1; no specific limitation is made here.

[0081] Please see Figures 8 to 11 ,in, Figure 8 An exploded view of the handcart frame 100 in the trolley 10 according to the first embodiment of the present invention is shown; Figure 9 for Figure 8 Enlarged view of the structure at point A in the middle circle; Figure 10 for Figure 9 Enlarged view of the structure at point B in the middle circle; Figure 11 for Figure 9 Enlarged view of the structure at point C in the middle circle.

[0082] Please see 8 and Figure 9 In the first embodiment, the locking mechanism 400 includes an engaging protrusion 410 and an engaging recess 420. One of the support base 310 and the second connecting base 132 has the engaging recess 420, and the other has the engaging protrusion 410. The engaging protrusion 410 engages with the engaging recess 420. When the engaging protrusion 410 extends into the engaging recess 420, the support base 310 is restricted from rotating relative to the second connecting base 132. When the engaging protrusion 410 disengages from the engaging recess 420, the support base 310 is allowed to rotate relative to the second connecting base 132. Specifically, in the two stages of the upper frame 110 pivoting relative to the lower frame 120, in the first stage, since the upper frame 110 does not apply external force to the first canopy strip 320, the engaging protrusion 410 remains inserted into the engaging recess 420, and both the support seat 310 and the first canopy strip 320 remain relatively fixed relative to the second connecting seat 132 and the lower frame 120. In the second stage, the upper frame 110 applies external force to the first canopy strip 320, which drives the support seat 310 to rotate so that the engaging protrusion 410 can disengage from the engaging recess 420. Therefore, in this stage, both the support seat 310 and the first canopy strip 320 can pivot relative to the second connecting seat 132 and the lower frame 120, and the first canopy strip 320 can move away from or towards the lower frame 120 circumferentially around the rotation axis S1.

[0083] Please see Figures 9 to 11In one embodiment, multiple engaging recesses 420 are provided, and the multiple engaging recesses 420 are spaced apart circumferentially along the rotation axis S1. In this embodiment, the support base 310 is provided with multiple engaging recesses 420, and the second connecting base 132 is provided with engaging protrusions 410. In the first stage, the engaging protrusions 410 remain inserted into the current engaging recess 420. In the second stage, due to the continuous rotation of the upper frame 110, the first canopy strip 320 will be continuously subjected to the external force applied by the upper frame 110, so as to continuously drive the support base 310 to rotate relative to the second connecting base 132 about the rotation axis S1. In this way, the engaging protrusions 410 can sequentially disengage from the current engaging recess 420 and extend into the adjacent engaging recess 420, thereby limiting the continuous rotation of the support base 310 relative to the second connecting base 132. In other words, during the rotation of the first canopy strip 320 and the support seat 310 driven by the upper frame 110 (i.e., in the second stage), the engaging protrusion 410 will successively disengage from one of the multiple engaging recesses 420 and then enter another adjacent engaging recess 420. For example, any three adjacent engaging recesses 420 can be selected and referred to as the first engaging recess 420a, the second engaging recess 420b, and the third engaging recess 420c, respectively, and arranged sequentially around the rotation axis S1. The engaging protrusion 410 will disengage from the first engaging recess 420a and then extend into the second engaging recess 420b; subsequently, it will disengage from the second engaging recess 420b and extend into the third engaging recess 420c. This intermittent rotation of the support base 310 allows the first canopy strip 320 to approach or move away from the lower frame 120 more slowly. Thus, during the folding of the canopy mechanism 300 along with the lower frame 100, a violent impact between the first canopy strip 320 and the lower frame 120 is avoided. This not only prevents wear and structural deformation of the canopy mechanism 300 and the lower frame 120, but also effectively extends the service life of the trolley 10.

[0084] It should be noted that "continuous rotation" means that the support base 310 rotates uninterruptedly and continuously relative to the second connecting base 132 around the rotation axis S1. In this embodiment, the locking mechanism 400 allows the support base 310 to rotate intermittently relative to the second connecting base 132. In other words, under the action of the locking mechanism 400, the rotation of the support base 310 relative to the second connecting base 132 is paused and intermittent. In this way, when the canopy mechanism 300 is opened or closed, it can approach or touch the frame 100 in a gentle manner, thereby effectively reducing the impact force generated between the two.

[0085] Furthermore, it should be noted that the engaging protrusion 410 can be, for example, a raised structure or a convex structure; the engaging recess 420 can be, for example, a groove structure or a perforated structure, etc., and no specific limitation is made here. Specifically, in this embodiment, the engaging recess 420 is a groove structure.

[0086] In this embodiment, when the trolley 10 is in the unfolded state and the canopy mechanism 300 is in the extended state, if the user needs to fold the canopy mechanism 300, the locking mechanism 400 can be used to restrict the continuous rotation of the support base 310 relative to the second connecting seat 132, thereby reducing the impact of the first canopy strip 320 on the upper frame 110. Specifically, the user directly pushes or pulls the first canopy strip 320 towards the direction of the second canopy strip 330. During this process, the engaging protrusion 410 will continuously disengage from one of the multiple engaging recesses 420 and then enter another adjacent engaging recess 420, causing the support base 310 to exhibit intermittent rotation. In this way, the first canopy strip 320 can approach the upper frame 110 relatively slowly, avoiding a violent impact. Therefore, in this embodiment, the locking mechanism 400 can not only restrict the rotation of the support base 310 relative to the second connecting seat 132, but also restrict its continuous rotation. On the one hand, during the folding process of the canopy mechanism 300 along with the trolley 10, it can effectively prevent the canopy mechanism 300 (specifically the first canopy strip 320) from having a violent and rapid impact with the lower frame 120; on the other hand, when the trolley 10 is in the unfolded state, if the user switches the canopy mechanism 300 from the unfolded state to the folded state separately, it can also prevent the canopy mechanism 300 (specifically the first canopy strip 320) from having such an impact with the upper frame 110.

[0087] Please continue reading Figures 9 to 13 In one embodiment, the engaging recess 420 is provided with a guide slope 421; and / or the engaging protrusion 410 is provided with a guide slope 411. In other words, in this embodiment, only the engaging recess 420 may be provided with a guide slope 421; or only the engaging protrusion 410 may be provided with a guide slope 411; or the engaging recess 420 may be provided with a guide slope 421, while the engaging protrusion 410 is provided with a guide slope 411. When the support 310 rotates relative to the second connecting seat 132, the engaging protrusion 410 pushes against the engaging recess 420 through the guide slope 421 and / or the guide slope 411, driving the support 310 to move away from the second connecting seat 132 along the axial direction of the rotation axis S1 (i.e., along the second direction F2), thereby disengaging the engaging protrusion 410 from the engaging recess 420. Specifically, in this embodiment, as Figure 10As shown, the sidewall of the engaging recess 420 is provided with a guide slope 421. More specifically, along the rotation direction of the support 310 relative to the second connecting seat 132, both opposite sidewalls of the engaging recess 420 are provided with guide slopes 421. Thus, regardless of whether the support 310 rotates clockwise or counterclockwise relative to the second connecting seat 132 about the rotation axis S1, the engaging protrusion 410 can be disengaged from the engaging recess 420 by means of the guide slopes 421. Of course, in other embodiments, such as... Figure 11 As shown, the engaging protrusion 410 is provided with a guide slope 411. When the support 310 rotates relative to the second connecting seat 132, the guide slope 411 will be pushed by the edge of the notch of the engaging recess 420, causing the support 310 to move away from the second connecting seat 132 (i.e., along the second direction F2), thereby causing the engaging protrusion 410 to retract from the engaging recess 420.

[0088] Please combine Figures 10 to 13 In one embodiment, the position of the support seat 310 when the engaging protrusion 410 extends into the engaging recess 420 is referred to as the first position. Due to the pushing action between the guide ramp 421 and the engaging protrusion 410, the support seat 310 can move along the second direction F2 while rotating relative to the second connecting seat 132, so that the engaging protrusion 410 exits the engaging recess 420. At this time, the position of the support seat 310 is referred to as the second position. In other words, when the support seat 310 rotates relative to the second connecting seat 132, it can move axially along the rotation axis S1, thereby having the first position (see...). Figure 12 ) and second position (see Figure 13Specifically, when the support seat 310 is in the first position, the engaging protrusion 410 extends into the engaging recess 420, and the support seat 310 is in contact with the second connecting seat 132. When the support seat 310 is in the second position, the engaging protrusion 410 disengages from the engaging recess 420, and the engaging protrusion 410 pushes against the support seat 310, so that there is a pushing gap 610 between the support seat 310 and the second connecting seat 132. Along the axial direction of the rotation axis S1, the width H1 of the pushing gap 610 is equal to the length L1 of the engaging protrusion. When the support seat 310 rotates relative to the second connecting seat 132, the engaging protrusion 410 can retract from the engaging recess 420 by abutting against the guide slope 421, thereby driving the support seat 310 to switch from the first position to the second position. As described above, during the unfolding or folding of the trolley 10, when the upper frame 110 pivots relative to the lower frame 120, the upper frame 110 applies an external force to the first canopy strip 320, causing the first canopy strip 320 to tend to rotate around the pivot axis S1. Since the first canopy strip 320 is connected to the support base 310, the support base 310 will synchronously generate a tendency to rotate around the pivot axis S1. When the external force applied by the upper frame 110 to the first canopy strip 320 is greater than the force required for the engaging protrusion 410 to push against the guide slope 421 and thus disengage from the engaging recess 420, the support base 310 will rotate relative to the second connecting seat 132. Alternatively, when the trolley 10 is in the unfolded state, and the user needs to switch the state of the canopy mechanism 300, the user directly applies an external force to the first canopy strip 320. Similarly, this external force can cause the first canopy strip 320 and the support base 310 to rotate synchronously about the pivot axis S1 relative to the second connecting base 132. See also... Figure 9 , Figure 12 and Figure 13In one embodiment, the frame 100 further includes a cover 140 and a first elastic element 150. The cover 140 is disposed on the side of the support 310 away from the second connecting seat 132 and is connected to the second connecting seat 132. Specifically, a movable gap 620 is provided between the cover 140 and the support 310 to allow the support 310 to move axially along the rotation axis S1. This movable gap 620 ensures that the support 310 can move axially along the rotation axis S1; specifically, the movable gap 620 provides the necessary travel distance for the support 310 to move from the first position to the second position. Specifically, when the support 310 switches from the first position to the second position, the pushing gap 610 between the support 310 and the second connecting seat 132 gradually increases, while the movable gap 620 between the support 310 and the cover 140 gradually decreases. Furthermore, the increase in the width of the pushing gap 610 is equal to the decrease in the width of the movable gap 620. In this embodiment, along the axial direction of the rotation axis S1, the width H2 of the movable gap 620 is greater than the width H1 of the abutment gap 610. The first elastic element 150 can be, for example, a spring, a sheet, or other elastic element. The first elastic element 150 is disposed within the movable gap 620 and abuts against the cover 140 and the support 310, used to drive the support 310 to remain in the first position. Specifically, during the rotation of the support 310 relative to the second connecting seat 132, when the engaging protrusion 410 disengages from one of the engaging recesses 420 by means of the guide ramp 421, the support 310 is in the second position, and the first elastic element 150 is compressed and deformed to store elastic potential energy. As the support 310 continues to rotate, when the engaging protrusion 410 abuts against the area between two adjacent engaging recesses 420, the support 310 will continue to remain in the second position. When the support seat 310 rotates to the point where the engaging protrusion 410 is opposite to the adjacent engaging recess 420, the first elastic element 150 resets, thereby automatically switching the support seat 310 from the second position to the first position, allowing the engaging protrusion 410 to re-enter the other engaging recess 420. The direction in which the support seat 310 moves from the second position to the first position is defined as the third direction F3. Both the third direction F3 and the second direction F2 are parallel to the axial direction of the rotation axis S1, and their directions are opposite. Specifically, in this embodiment, the second direction F2 points to the outer side of the trolley 10 (away from the center of the trolley 10), while the third direction F3 points to the inner side of the trolley 10 (closer to the center of the trolley 10).

[0089] Please see Figure 7In one embodiment, the number of engaging protrusions 410 can be multiple, not limited to one; for example, two, three, etc., can be provided. In this embodiment, there are two engaging protrusions 410, and these two engaging protrusions 410 are arranged circumferentially opposite each other around the rotation axis S1. When the support 310 is in the first position, the two engaging protrusions 410 simultaneously extend into the two engaging recesses 420 to achieve a convex-concave fit. For ease of description, the two engaging recesses 420 are referred to as a pair of engaging recesses 420. When the support 310 rotates relative to the second connecting seat 132, the two engaging protrusions 410 will exit from their corresponding pair of engaging recesses 420 and then extend into another adjacent pair of engaging recesses 420. By providing multiple engaging protrusions 410 simultaneously engaging with multiple engaging recesses 420, the reliability of the support 310 during intermittent rotation relative to the second connecting seat 132 can be improved.

[0090] Please see Figures 9 to 11 In one embodiment, one of the support base 310 and the second connecting base 132 is further provided with a limiting rib 1321, and the other is provided with a limiting groove 311. The limiting groove 311 has an arc-shaped structure, and the center of the arc of the limiting groove 311 is coaxially arranged with the rotation axis S1. The limiting rib 1321 can extend into the limiting groove 311 in a direction parallel to the rotation axis S1. Specifically, the protrusion length L2 of the limiting rib 1321 in the direction parallel to the axis is less than the protrusion length L1 of the engaging protrusion 410 in the direction parallel to the axial direction. Therefore, when the engaging protrusion 410 disengages from the engaging recess 420, that is, when the support base 310 is in the second position, the limiting rib 1321 will disengage from the limiting groove 311. Thus, during the rotation of the support base 310 relative to the second connecting base 132, if... Figures 14 to 16 As shown, the limiting rib 1321 will not interfere with the rotational movement, nor will it restrict the rotational range of the support 310. Therefore, in this embodiment, the arc length of the limiting groove 311 is not specifically limited. Of course, it can also be understood that the angle of the central angle corresponding to the limiting groove 311 is not specifically limited; it can be larger or smaller, and no specific limitation is made here. In this embodiment, the second connecting seat 132 is provided with the limiting rib 1321, and the support 310 is provided with the limiting groove 311. Optionally, in other embodiments, the aforementioned limiting groove 311 and limiting rib 1321 can also be omitted.

[0091] The following diagrams briefly explain the process and principle of using the canopy mechanism 300.

[0092] See Figure 1 When the trolley 10 is in the unfolded state and the canopy mechanism 300 is in the open state, the canopy 350 can effectively cover and protect the seating space below. In this case, if the user only needs to fold the canopy mechanism 300 (by... Figure 1 Towards Figure 5 (Switching), the user pushes or pulls the first canopy strip 320 clockwise. At this time, the first canopy strip 320 will cause the support base 310 to rotate clockwise relative to the second connecting base 132 around the rotation axis S1. During this process, please refer to... Figures 9 to 11 With the help of the guide ramp 421, the engaging protrusion 410 can disengage from the engaging recess 420 with which it initially engages. Subsequently, as the support base 310 continues to rotate clockwise, the engaging protrusion 410 will momentarily engage with the subsequent engaging recess 420, and then quickly disengage from the engaging recess 420 to enter the next engagement cycle, until the first canopy strip 320 approaches the second canopy strip 330 or the upper frame 110. During this process, the support base 310 switches back and forth between the first position and the second position. When the first canopy strip 310 approaches the second canopy strip 320, the canopy mechanism 300 is in the retracted state, and the support base 310 remains in the first position. It should be noted that the above-mentioned continuous disengagement and engagement alternation mechanism causes the first canopy strip 320 to exhibit intermittent pauses in motion as it gradually approaches the second canopy strip 330 and the upper frame 110. It can be seen that the canopy mechanism 300 exhibits indexing motion characteristics during state switching.

[0093] When the trolley 10 is in the unfolded state and the canopy mechanism 300 is in the retracted state, if the user needs to unfold the canopy mechanism 300 (by... Figure 5 Towards Figure 1 (Switching) When the user pushes or pulls the first canopy strip 320 counterclockwise, the first canopy strip 320 will cause the support base 310 to rotate counterclockwise relative to the second connecting seat 132 around the rotation axis S1. Similarly, during this process, with the help of the guide slope 421, the engaging protrusion 410 can disengage from the engaging recess 420 with which it initially engages. Subsequently, as the support base 310 continues to rotate counterclockwise, the engaging protrusion 410 will momentarily engage with the subsequent engaging recess 420, and then quickly disengage from the engaging recess 420, thus entering the next engagement cycle, until the canopy mechanism 300 is in the open state. Similarly, during this process, the support base 310 switches back and forth between the first position and the second position. When the canopy mechanism 300 is in the open state, the support base 310 remains in the first position. Similarly, the aforementioned continuous disengagement and engagement alternation mechanism causes the first canopy strip 320 to exhibit intermittent pauses in motion as it moves away from and towards the second canopy strip 330 and the upper frame 110. It can be seen that the canopy mechanism 300 exhibits indexing motion characteristics during state switching.

[0094] Please see Figure 1When the trolley 10 is in the unfolded state and the canopy mechanism 300 is in the extended state, if the user needs to fold the trolley 10 (by... Figure 1 sequentially to Figure 2 , Figures 3 to 4 (Switching), first rotate the upper frame 110 counterclockwise to bring it closer to the lower frame 120 around the first pivot joint 130. Please combine with... Figure 8 and Figure 9 During the first stage of rotation of the first connecting seat 131 relative to the second connecting seat 132, the first canopy strip 320 and the support seat 310 remain relatively fixed to the second connecting seat 132. At this time, since the second canopy strip 330 is mounted on the first connecting seat 131 along with the upper frame 110, when the upper frame 110 rotates relative to the second connecting seat 132 via the first connecting seat 131, the second canopy strip 330 will rotate along with the upper frame 110 and follow the first connecting seat 131, gradually approaching the first canopy strip 320. As the distance between the second canopy strip 330 and the first canopy strip 320 shortens, the canopy 350 gradually loses tension and loosens, eventually being gathered between the first canopy strip 320 and the second canopy strip 330. When the canopy mechanism 300 is in the gathered state (see...), Figure 3 The diagram shows a schematic of the canopy mechanism 300 when it is close to the retracted state. If the upper frame 110 continues to rotate counterclockwise (i.e., in the second stage), under the action of thrust, the upper frame 110 will push the first canopy strip 320 to rotate counterclockwise relative to the second connecting seat 132 around the rotation axis S1. At the same time, the first canopy strip 320 will drive the support seat 310 to rotate counterclockwise relative to the second connecting seat 132 around the rotation axis S1. Similarly, during this process, with the help of the guide ramp 421, the engaging protrusion 410 can disengage from the engaging recess 420 with which it initially engages. Subsequently, as the support base 310 rotates counterclockwise, the engaging protrusion 410 will momentarily engage with the subsequent engaging recess 420, and then quickly disengage from the engaging recess 420 to enter the next engagement cycle, until the first canopy strip 320 approaches the lower frame 120 and the upper frame 110 is completely folded relative to the lower frame 120. It should be noted that this continuous alternation of disengagement and engagement causes the first canopy strip 320 to exhibit intermittent pauses in its movement as it gradually approaches the lower frame 120.

[0095] Please see Figure 4 When the trolley 10 is in the folded state and the canopy mechanism 300 is in the retracted state. If the user needs to unfold the trolley 10 (by... Figure 4 Towards Figure 1 (Switch), pull the upper frame 110, and the upper frame 110 will pivot around the first pivot joint 130 away from the lower frame 120. Please combine Figure 8 and Figure 9 During the first stage of rotation of the first connecting seat 131 relative to the second connecting seat 132, the support seat 310 and the first canopy strip 320 are initially fixed relative to the second connecting seat 132. At this time, since the second canopy strip 330 is mounted on the first connecting seat 131 along with the upper frame 110, when the upper frame 110 rotates relative to the second connecting seat 132 via the first connecting seat 131, the second canopy strip 330 will rotate along with the upper frame 110 and follow the first connecting seat 131, gradually moving away from the first canopy strip 320. As the distance between the second canopy strip 330 and the first canopy strip 320 increases, the originally loose tarpaulin 350 is gradually tightened by tension, and finally fully stretched between the second canopy strip 330 and the first canopy strip 320, forming an effective covering structure. Once the canopy mechanism 300 is in the extended state, the upper frame 110 continues to rotate clockwise (i.e., in the second stage). Under the linkage of the canopy 350, the first canopy strip 320 and the support seat 310 will rotate clockwise relative to the second connecting seat 132 around the rotation axis S1 until the upper frame 110 and the lower frame 120 are fully extended. Similarly, during this rotation, the rotation of the support seat 310 driven by the first canopy strip 320 is not continuous and smooth, exhibiting intermittent pauses.

[0096] Please combine Figure 9 and Figure 17In one embodiment, the first pivot joint 130 further includes a locking member 133, which is axially movably disposed between the first connecting seat 131 and the second connecting seat 132 to restrict or allow relative pivoting between them. In this embodiment, the first connecting seat 131 has a first chamber 1311 and a first locking groove 1312 disposed within the first chamber 1311 on the side facing the second connecting seat 132. The second connecting seat 132 has a second chamber 1323 and a second locking groove (not shown in the figure) disposed within the second chamber 1323 on the side facing the first connecting seat 131. The locking member 133 is a gear structure with locking teeth 1331. The locking member 133 is axially movably disposed between the first chamber 1311 and the second chamber 1323 and has a locked position and an unlocked position. When the locking member 133 is in the locked position, one end of the locking member 133 is located in the first chamber 1311 and the other end is located in the second chamber 1323. Thus, the locking teeth 1331 on the outside of the locking member 133 simultaneously engage the first locking groove 1312 and the second locking groove axially to restrict the first connecting seat 131 from pivoting relative to the second connecting seat 132. When the locking member 133 is in the unlocked position, the locking member 133 can be fully moved into the first chamber 1311 or the second chamber 1323, and the locking teeth 1331 correspondingly disengage from the second locking groove or the first locking groove 1312 to allow the first connecting seat 131 to pivot relative to the second connecting seat 132. In this embodiment, when the locking member 133 is in the unlocked position, the locking teeth 1331 of the locking member 133 disengage from the first locking groove 1312, and the locking member 133 is fully moved into the second chamber 1323. Based on this, when the trolley 10 needs to be folded, the user needs to first unlock the first pivot joint 130 to allow the locking member 133 to be fully moved into the second chamber 1323.

[0097] Please continue reading Figure 9 and Figure 17 In one embodiment, the first pivot joint 130 further includes a drive member 134, which is rotatably disposed axially between the first connecting seat 131 and the locking member 133. Specifically, the locking member 133 has a drive portion 1332, and the drive member 134 has a drive ramp (not shown in the figure). The drive ramp extends obliquely along the circumference of the drive member 134, and the drive ramp abuts against the drive portion 1332 axially. When the drive member 134 rotates, the drive member 134 can push against the drive portion 1332 through the drive ramp to move the locking member 133 axially from the locked position to the unlocked position.

[0098] Please see Figure 8 and Figure 9In one embodiment, the trolley 10 further includes a release mechanism 900, which is capable of driving and engaging with the drive member 134 in the first pivot joint 130. When the release mechanism 900 is operated, it can drive the drive member 134 to rotate, thereby driving the locking member 133 to move to the release position.

[0099] The second embodiment of the present invention also provides another trolley 10, which is similar to the first embodiment, including a handlebar frame 100, a wheel frame 200, a canopy mechanism 300, and a locking mechanism 400, etc. The trolley 10 of this embodiment can be considered a variation of the trolley 10 of the first embodiment described above. Unless otherwise specified, the structure of the components and the connection relationships between the components in this embodiment can be referred to in the description of the first embodiment above. Therefore, when the structure, connection relationships, etc., of the same components as in the first embodiment are mentioned in this embodiment, the relevant illustrations can be referred to the corresponding illustrations in the first embodiment. The following mainly describes the differences between this embodiment and the first embodiment described above.

[0100] This embodiment differs from the first embodiment described above in at least the following ways.

[0101] In this embodiment, the structure of the locking mechanism 400 is slightly different from that shown in the first embodiment, and the structure of the support base 310 is also slightly different. Specifically, the second connecting base 132 is also provided with a limiting rib 1321, and the support base 310 is also provided with a limiting groove 311. However, in this embodiment, see... Figure 11 The protruding length L2 of the limiting rib 1321 along the direction parallel to the rotation axis S1 is greater than the protruding length L1 of the engaging protrusion 410 along the direction parallel to the rotation axis S1. Therefore, regardless of whether the support 310 is in the first or second position, that is, regardless of whether the engaging protrusion 410 extends into or disengages from the engaging recess 420, the limiting rib 1321 extends into the limiting groove 311 along the direction parallel to the rotation axis S1. In this way, the two ends of the limiting groove 311 (referred to as the first end 3111 and the second end 3112, respectively) restrict the rotational stroke of the support 310 relative to the second connecting seat 132. In other words, the central angle α0 corresponding to the limiting groove 311 defines the rotational range of the support 310 relative to the second connecting seat 132. Figure 19 As shown, when the support base 310 rotates clockwise relative to the second connecting base 132 until the limiting rib 1321 is located at the first end 3111 of the limiting groove 311, the support base 310 can no longer rotate clockwise. Similarly, when the support base 310 rotates counterclockwise relative to the second connecting base 132 until the limiting rib 1321 is located at the second end 3112 of the limiting groove 311, the support base 310 can no longer rotate counterclockwise.

[0102] Please see Figure 18 and Figure 19 In one embodiment, the circumferential dimension of the limiting groove 311 along the rotation axis S1 is larger than that of the limiting groove 311 along the rotation axis S1 in the first embodiment described above. In this embodiment, the central angle α0 corresponding to the limiting groove 311 is approximately 180°. When the trolley 10 is in the unfolded state and the canopy mechanism 300 is in the extended state, the limiting rib 1321 is located at the middle of the limiting groove 311 along the arc length direction of the limiting groove 311. When the first canopy strip 320 and the upper frame 110 approach each other so that the canopy mechanism 300 is in the retracted state, the limiting rib 1321 is located at the first end 3111 of the limiting groove 311. When the trolley 10 is folded to drive the canopy mechanism 300 to retract synchronously and approach the lower frame 120, the limiting rib 1321 is located at the second end 3112 of the limiting groove 311. Of course, in other embodiments, the central angle α0 corresponding to the limiting groove 311 may be greater than or less than 180°, and no specific limitation is made here.

[0103] Please see Figure 18 In one embodiment, the support base 310 and the second connecting base 132, which have an engaging recess 420, also have a locking recess 460. The locking recess 460 is adapted to lock into the engaging protrusion 410. Specifically, in this embodiment, the second connecting base 132 has two locking recesses 460, which are arranged circumferentially opposite each other along the rotation axis S1, and are respectively arranged radially opposite to the first end 3111 and the second end 3112 of the limiting groove 311 along the rotation axis S1. Please refer to... Figure 18 and Figure 19Thus, with the handframe 100 extended, when the first canopy strip 320 is rotated to approach the upper handframe 110, causing the canopy mechanism 300 to be in the retracted state, the limiting rib 1321 is precisely located at the first end 3111 of the limiting groove 311, and the two engaging protrusions 410 are precisely engaged with the two locking recesses 460, thereby ensuring that the canopy mechanism 300 can be stably maintained in the retracted state. When the canopy mechanism 300 is folded down synchronously with the trolley 10 to be in the retracted state, the limiting rib 1321 is precisely located at the second end 3112 of the limiting groove 311, and the two engaging protrusions 410 can also be engaged with the two locking recesses 460, so that the canopy mechanism 300 can be stably maintained in the retracted state. Specifically, the circumferential dimension of the locking recess 460 along the rotation axis S1 is different from the dimension of the engaging recess 420. More specifically, the circumferential dimension of the locking recess 460 along the rotation axis S1 is larger than the dimension of the engaging recess 420. This allows the engaging protrusion 410 to be completely contained within the locking recess 460, ensuring a tight fit between the support base 310 and the second connecting base 132 when the canopy mechanism 300 is in the retracted state, eliminating the pushing gap 610 between them and preventing debris from entering the pushing gap 610. Simultaneously, it also ensures that the engaging protrusion 410 is stably inserted into the locking recess 460, thereby improving the stability of the canopy mechanism 300 when it is in the retracted state.

[0104] Please see Figure 18 In one embodiment, the locking recess 460 is provided with a sliding ramp 461; and / or the engaging protrusion 410 is provided with a sliding ramp 412. In other words, in this embodiment, only the locking recess 460 may be provided with a sliding ramp 461; or only the engaging protrusion 410 may be provided with a sliding ramp 412; or the locking recess 460 may be provided with a sliding ramp 461, while the engaging protrusion 410 is provided with a sliding ramp 412. When the support 310 rotates relative to the second connecting seat 132, the engaging protrusion 410 abuts against the locking recess 460 through the sliding ramp 461 and / or the sliding ramp 412, so that the engaging protrusion 410 disengages from the locking recess 460. Specifically, in this embodiment, the sidewall of the locking recess 460 is provided with a sliding ramp 461. When the support 310 rotates relative to the second connecting seat 132, the engaging protrusion 410 can be disengaged from the locking recess 460 by means of the sliding ramp 461.

[0105] It should be noted that, optionally, the support base 310 in the first embodiment described above may also be provided with a locking recess 460, and no specific limitation is made here.

[0106] The third embodiment of the present invention also provides another trolley 10, which is similar to the first embodiment, including a handlebar frame 100, a wheel frame 200, a canopy mechanism 300, and a locking mechanism 400, etc. The trolley 10 of this embodiment can be regarded as a variation of the trolley 10 of the first embodiment described above. Unless otherwise specified, the structure of the components and the connection relationship between the components in this embodiment can be referred to the description in the first embodiment above. The following mainly describes the differences between this embodiment and the first embodiment described above.

[0107] This embodiment differs from the first embodiment described above in at least the following ways.

[0108] In this embodiment, the structure of the locking mechanism 400 differs from that in the first embodiment described above, and the structure of the second connecting seat 132 also differs from that in the first embodiment described above. For details, please refer to... Figure 20 In this embodiment, the locking mechanism 400 includes a bracket 440, a locking protrusion 410, and a plurality of locking recesses 420. The bracket 440 is movably disposed between the second connecting seat 132 and the support seat 310 along the rotation axis S1, and the bracket 440 is restricted from rotating relative to the second connecting seat 132. One of the support seat 310 and the bracket 440 has a locking recess 420, and the other has a locking protrusion 410. Similarly, when the locking protrusion 410 extends into the locking recess 420, the support seat 310 is restricted from rotating relative to the second connecting seat 132. When the locking protrusion 410 disengages from the locking recess 420, the support seat 310 is allowed to rotate relative to the second connecting seat 132.

[0109] Similarly, in this embodiment, as Figure 20 As shown, multiple engaging recesses 420 are provided, and the multiple engaging recesses 420 are arranged circumferentially at intervals along the rotation axis S1. In the first stage of rotation of the upper frame 110 relative to the lower frame 120, the engaging protrusion 410 remains inserted into the current engaging recess 420. In the second stage, similarly, the engaging protrusion 410 can sequentially disengage from the current engaging recess 420 and extend into the adjacent engaging recess 420 to limit the continuous rotation of the support 310 relative to the second connecting seat 132.

[0110] Please continue reading Figure 20In one embodiment, one of the second connecting seat 132 and the bracket 440 is provided with a limiting protrusion 441, and the other is provided with a limiting recess 1322. The limiting protrusion 441 and the limiting recess 1322 engage. This restricts the rotation of the bracket 440 relative to the second connecting seat 132. In one embodiment, at least one limiting protrusion 441 is provided, and the number of limiting protrusions 441 and limiting recesses 1322 is the same. When multiple limiting protrusions 441 are provided, the multiple limiting protrusions 441 are circumferentially spaced around the rotation axis S1. This enhances the rotational constraint between the bracket 440 and the second connecting seat 132. Specifically, in this embodiment, the bracket 440 is disposed between the support seat 310 and the second connecting seat 132, and the bracket 440, the second connecting seat 132, and the support seat 310 are coaxially arranged. In this embodiment, the support base 310 is provided with a plurality of engaging recesses 420, the bracket 440 is provided with engaging protrusions 410 and limiting protrusions 441, and the second connecting base 132 is provided with limiting recesses 1322.

[0111] Please see Figure 20 and Figure 21 In one embodiment, the bracket 440 has a third position and a fourth position between the support base 310 and the second connecting base 132. Furthermore, the second connecting base 132 is also provided with a positioning recess 450. When the bracket 440 is in the third position, the engaging protrusion 410 engages simultaneously with both the engaging recess 420 and the positioning recess 450, thereby further restricting the rotation of the support base 310 relative to the second connecting base 132. When the bracket 440 is in the fourth position, the engaging protrusion 410 engages with the positioning recess 450 and disengages from the engaging recess 420, thereby allowing the support base 310 to rotate relative to the second connecting base 132. Similarly, in this embodiment, the engaging recess 420 is provided with a guide slope 421; and / or the engaging protrusion 410 is provided with a guide slope 411. Therefore, when the support 310 rotates relative to the second connecting seat 132, the engaging protrusion 410 can push against the engaging recess 420 through the guide slope 421 and / or guide slope 411, thereby driving the bracket 440 to automatically switch from the third position to the fourth position.

[0112] It should be noted that in other embodiments, when the bracket 440 is in the third position, and the engaging protrusion 410 engages simultaneously with the engaging recess 420 and the positioning recess 450, the aforementioned limiting protrusion 441 and limiting recess 1322 can be omitted. In this way, the bracket 440 can still be restricted from rotating relative to the second connecting seat 132. Of course, in other embodiments, while retaining the limiting protrusion 441 and the limiting recess 1322, when the bracket 440 is in the third position, the engaging protrusion 410 can also engage only with the engaging recess 420 without engaging with the positioning recess 450. This still allows the bracket 440 to be restricted from rotating around the second connecting seat 132.

[0113] Please continue reading Figure 20 and Figure 21 In one embodiment, a second elastic element 800 is provided between the bracket 440 and the second connecting seat 132. The second elastic element 800 can be, for example, a spring, a sheet, or other elastic element, and it abuts between the bracket 440 and the second connecting seat 132 to keep the bracket 440 in a third position. During the rotation of the support seat 310 relative to the second connecting seat 132, when the engaging protrusion 410 disengages from one of the engaging recesses 420 by means of the guide ramp 421, the bracket 440 is in a fourth position, and the second elastic element 800 is compressed and deformed to store elastic potential energy. With continued rotation of the support seat 310, when the engaging protrusion 410 abuts against the area between two adjacent locking recesses 420, the bracket 440 will still remain in the fourth position. When the support 310 rotates to the point where the engaging protrusion 410 is opposite to the adjacent engaging recess 420, the second elastic member 800 resets to push the bracket 440 to automatically switch from the fourth position to the third position, so that the engaging protrusion 410 re-extends into the other engaging recess 420.

[0114] In this embodiment, when the support base 310 rotates relative to the second connecting base 132, the two remain relatively fixed along the axial direction of the rotation axis S1. This prevents gaps from forming between the support base 310 and the second connecting base 132 due to rotation, effectively preventing impurities from accidentally falling between them. This not only avoids adverse effects on the rotational reliability of the support base 310 but also helps to increase its service life.

[0115] The fourth embodiment of the present invention also provides another trolley 10, which is similar to the third embodiment, including a handlebar frame 100, a wheel frame 200, a canopy mechanism 300, and a locking mechanism 400, etc. The trolley 10 of this embodiment can be regarded as a variation of the trolley 10 of the third embodiment described above. Unless otherwise specified, the structure of the components and the connection relationship between the components in this embodiment can be referred to the description in the third embodiment above. The following mainly describes the differences between this embodiment and the third embodiment described above.

[0116] This embodiment differs from the third embodiment described above in at least the following ways.

[0117] In this embodiment, the structure of the frame 100 differs from that of the frame 100 in the third embodiment described above. Specifically, in this embodiment, the frame 100 further includes a locking and retaining mechanism 700. This locking and retaining mechanism 700 can be used to stably hold the frame 100 in a folded state.

[0118] Please see Figure 22 and Figure 23In one embodiment, the first connecting seat 131 includes a first pivot portion 131a and a first connecting portion 131b connected together, the first connecting portion 131b being a strip-shaped tubular structure. The upper frame 110 is a U-shaped tubular structure, the first connecting portion 131b is sleeved on the outside of the upper frame 110 and connected to the upper frame 110, and the inner cavity of the first connecting portion 131b is in communication with the inner cavity of the upper frame 110. The second connecting seat 132 includes a second pivot portion 132a and a second connecting portion 132b connected together, the second connecting portion 132b being connected to the lower frame 120. The second pivot portion 132a and the first pivot portion 131a rotate around the first pivot point Q1.

[0119] Please see Figures 23 to 26 In one embodiment, the locking and retaining mechanism 700 includes a retaining member 710 and a retaining recess 720. One of the retaining member 710 and the retaining recess 720 is disposed on the upper frame 110, and the other is disposed on the second connecting seat 132. Specifically, in this embodiment, the retaining member 710 is movably disposed within the upper frame 110 and has a locked position and an unlocked position. The retaining recess 720 is provided on the outer periphery of the second pivot portion 132a of the second connecting seat 132. In this embodiment, the position of the upper frame 110 when the upper frame 110 and the lower frame 120 are held in a relatively folded state is called the folded position. Specifically, when the upper frame 110 is in the folded position, the retaining member 710 is positioned opposite to the retaining recess 720, and the retaining member 710 will move to the locking position to extend into the retaining recess 720. In this way, the rotation of the first connecting seat 131 relative to the second connecting seat 132 can be restricted, thereby restricting the rotation of the upper frame 110 relative to the lower frame 120, so that the upper frame 110 and the lower frame 120 are kept in a relatively folded state.

[0120] Please continue reading Figures 23 to 26In one embodiment, the locking and retaining mechanism 700 further includes a third elastic element 730, which may be, for example, a spring, a sheet, or other elastic element. This third elastic element 730 is disposed within the upper frame 110 and abuts against the retainer 710, used to keep the retainer 710 in the locked position. When the upper frame 110 is in any position other than the folded position, the retainer 710 abuts against the outer peripheral wall of the second pivot portion 132a. At this time, the third elastic element 730 is compressed and deformed to store elastic potential energy. When the upper frame 110 rotates to the folded position, the retainer 710 faces the retaining recess 720, and the third elastic element 730 automatically resets to push the retainer 710 to automatically insert into the retaining recess 720. Specifically, in this embodiment, the locking and retaining mechanism 700 also includes a mounting bracket 740, which is disposed on the upper frame 110. The retainer 710 is movably disposed on the mounting bracket 740 to switch between the locked and unlocked positions. Specifically, the third elastic member 730 abuts between the retainer 710 and the mounting bracket 740. It should be noted that in other embodiments, the mounting bracket 740 may be omitted, and the third elastic member 730 may directly abut between the retainer 710 and the wall or protrusion (not shown in the figure) inside the upper frame 110, without any specific limitation.

[0121] Please see Figure 23 and Figure 24 In one embodiment, the sidewall of the retaining recess 720 is formed with a guide ramp 721, which is used to guide the retainer 710 out of the retaining recess 720 when the upper frame 110 pivots relative to the lower frame 120 to unfold.

[0122] Please see Figure 26In this embodiment, the first pivot joint 130 further includes a fourth elastic element 135 and a fixing element 136. The fixing element 136 is disposed on the side of the first connecting seat 131 opposite to the second connecting seat 132 and is fixedly connected to the second connecting seat 132. This prevents the first connecting seat 131 and the second connecting seat 132 from separating axially during pivoting. Specifically, the fourth elastic element 135 may be, for example, a torsion spring, which abuts against the fixing element 136 and the first connecting seat 131. When the upper frame 110 is in the folded position, the torsion spring is in its natural state. When the upper frame 110 pivots relative to the lower frame 120 to unfold, the torsion spring is in a torsional state. Therefore, when the locking member 133 is in the unlocked position (e.g., the trolley 10 is in the unfolded state), the upper frame 110 can pivot relative to the lower frame 120. At this time, the torsion spring resets to drive the first connecting seat 131 to rotate relative to the second connecting seat 132, causing the upper frame 110 to pivot towards the lower frame 120, thereby facilitating the pivoting and folding of the upper frame 110 relative to the lower frame 120. It should be noted that in other embodiments, the aforementioned fourth elastic member 135 and fixing member 136 may also be omitted, and no specific limitation is made here.

[0123] It should be noted that, optionally, the rider frame 100 in the first and second embodiments described above may also be provided with a locking and retaining mechanism 700. Furthermore, the first pivot joint 130 in the first and second embodiments described above may also include a fourth elastic member 135 and a fixing member 136, without specific limitations.

[0124] The fifth embodiment of the present invention also provides another trolley 10, which is similar to the fourth embodiment, including a handlebar frame 100, a wheel frame 200, a canopy mechanism 300, a locking mechanism 400, and a locking and retaining mechanism 700, etc. The trolley 10 of this embodiment can be regarded as a variation of the trolley 10 of the fourth embodiment described above. Unless otherwise specified, the structure of the components and the connection relationship between the components in this embodiment can be referred to the description in the fourth embodiment above. The following mainly describes the differences between this embodiment and the fourth embodiment described above.

[0125] This embodiment differs from the fourth embodiment described above in at least the following ways.

[0126] In this embodiment, the structure and location of the locking and retaining mechanism 700 differ from those in the fourth embodiment described above. Please refer to... Figure 27 and Figure 28In this embodiment, the retaining member 710 is movably disposed on the first pivot portion 131a of the first connecting seat 131, and a retaining recess 720 is provided inside the second pivot portion 132a of the second connecting seat 132. Specifically, the retaining member 710 is movably disposed on the side of the first pivot portion 131a facing the second pivot portion 132a, and the retaining recess 720 is disposed on the side of the second pivot portion 132a facing the first pivot portion 131a. The third elastic member 730 abuts against the retaining member 720 and the first pivot portion 131a. When the upper frame 110 and the lower frame 120 are relatively extended, the retaining member 720 is abutted between the first pivot portion 131a and the second pivot portion 132a and held in the unlocked position, while the third elastic member 730 remains in a compressed state. Please refer to [link to relevant documentation]. Figure 29 and Figure 30 When the upper frame 110 rotates to the folded position relative to the second connecting seat 132 with the first connecting seat 131, the retaining member 710 is opposite to the retaining recess 720. Under the restoring force of the third elastic element 730, the retaining member 710 is pushed to the locking position to insert into the retaining recess 720. In this way, the upper frame 110 and the lower frame 120 are locked, and the upper frame 110 is restricted from pivoting relative to the lower frame 120 to unfold. In this embodiment, the locking and retaining mechanism 700 is disposed inside the first pivot joint 130, which can improve the stability of the retaining member 710 locked in the retaining recess 720. In addition, it can also improve the wear problem of the retaining member 710 on the outside of the first pivot joint 130 (specifically the second pivot part 132a).

[0127] In one embodiment, see Figure 27 The retaining member 710 has a U-shaped structure and includes a first rod 711, a second rod 712, and a third rod 713 connected in sequence. The second rod 711 is provided with a locking head 714, which is used to insert into or retract from the retaining recess 720. When the retaining member 710 is in the locked position, the locking head 714 is inserted into the retaining recess 720. When the retaining member 710 is in the unlocked position, the locking head 714 retracts from the retaining recess 720. Please refer to... Figure 27 , Figure 28 and Figure 30 The first pivot portion 131a is provided with a moving channel 131c, which extends toward the second pivot portion 132a. The retaining member 710 is movable within the moving channel 131c to switch between a locked position and an unlocked position. Specifically, a limiting step 1311c is formed on the side wall of the moving channel 131c. The end of the first rod 711 away from the second rod 712 and the end of the third rod 713 away from the second rod 712 are both bent outward to form a hanging portion 715. When the retaining member 710 is in the unlocked position, there is a gap between the hanging portion 715 and the limiting step 1311c. When the retaining member 710 is in the locked position, the limiting step 1311c abuts against the hanging portion 715 for a limiting engagement.

[0128] It should be noted that, in this embodiment, the first pivot joint 130 may also include a fourth elastic member 135 and a fixing member 136. Of course, both can be omitted, and no specific limitation is made here.

[0129] The trolley 10 in the above embodiments has the following technical effects:

[0130] This application achieves mechanical coupling between the deformation of the trolley 10 and the movement of the canopy mechanism 300 by configuring the canopy mechanism 300 to pivot around the lower handle 120 and move in conjunction with the upper handle 110. Specifically, when the user operates the handle 100 to fold or unfold the entire trolley 10, the pivoting motion of the upper handle 110 relative to the lower handle 120 directly drives the canopy mechanism 300 to perform a synchronous folding or unfolding action through mechanical linkage, forming a "one action, two responses" operation effect, simplifying the cumbersome process of traditional trolley 10 which requires step-by-step operation. Specifically, in this application, the upper handle 110 and the canopy mechanism 300 are linked. When the trolley 10 switches from the unfolded state to the folded state, in the early stage when the upper handle 110 rotates relative to the lower handle 120 to approach the lower handle 120, the upper handle 110 will drive the canopy mechanism 300 to fold. In the later stage of the rotation of the upper frame 110 relative to the lower frame 120 to approach the lower frame 120, the upper frame 110 applies an external force to the folded canopy mechanism 300 to drive the locking mechanism 400 to release (that is, the continuous pivoting of the upper frame 110 relative to the lower frame 120 will drive the locking mechanism 400 to release), thereby causing the canopy mechanism 300 to rotate relative to the lower frame 120 and approach the lower frame 120, so that the trolley 10 is folded. Conversely, when the trolley 10 switches from the folded state to the unfolded state, in the early stage of the rotation of the upper frame 110 relative to the lower frame 120 to move away from the lower frame 120, the upper frame 110 will drive the canopy mechanism 300 to open. Specifically, the second canopy strip 330 rotates together with the upper frame 110, while the first canopy strip 320 remains stationary. The tarpaulin 350 is gradually stretched open until the entire canopy mechanism 300 is in the stretched state. Later, as the upper frame 110 rotates relative to the lower frame 120 to move away from the lower frame 120, the upper frame 110 applies an external force to the stretched canopy mechanism 300 to drive the locking mechanism 400 to release (that is, the continuous pivoting of the upper frame 110 relative to the lower frame 120 will drive the locking mechanism 400 to release), thereby causing the stretched canopy mechanism 300 to rotate together with the lower frame 120 and move away from the lower frame 120, so that the trolley 10 can be unfolded. In this application, when the upper frame 110 rotates relative to the lower frame 120, it first drives the canopy mechanism 300 to retract or expand, and then drives the canopy mechanism 300, which is in the retracted or expanded state, to continue to rotate, so that the canopy mechanism 300 and the trolley 10 complete the folding or unfolding process synchronously.Compared to the design of traditional trolleys 10 (for example, during folding, the canopy mechanism 300 remains open until it comes into contact with the lower frame 120 and is then passively compressed and closed, which can easily damage the pivot mechanism of the canopy mechanism 300; or when unfolding, the canopy mechanism 300 remains closed throughout the process, requiring manual operation to unfold after the frame 100 is fully unfolded, which is inconvenient for multi-stage operations), this application does not rely on external pressure or manual intervention.

[0131] Furthermore, this application addresses the issues of insufficient guidance and cushioning in the folding process of the canopy mechanism 300 by incorporating a locking mechanism 400. Specifically, the support base 310 of the canopy mechanism 300 rotates around the rotation axis S1, providing a stable trajectory guide for the unfolding or folding of the canopy mechanism 300 and preventing unintended collisions caused by the deflection or swaying of the canopy mechanism 300. By limiting the continuous rotation of the support base 310, the locking mechanism 400 effectively suppresses the inertial impact generated by the rapid rotation of the canopy mechanism 300, significantly reducing the rigid impact between it and the cart frame 100, thereby reducing the risk of component wear and structural deformation and extending the overall service life of the cart 10. Furthermore, the locking mechanism 400 employs a locking protrusion 410 in conjunction with multiple locking recesses 420 spaced out circumferentially. When the first canopy strip 320 drives the support base 310 to rotate, the step-by-step disengagement and engagement of the locking protrusion 410 and the locking recesses 420 converts continuous rotation into a stepped motion. Each gear shift is buffered and paused by mechanical locking and engagement, which disperses the rotational impact force to prevent the canopy mechanism 300 from quickly contacting the handlebar 100 due to inertia. The precise control of the unfolding or folding angle is achieved through clear tactile feedback of the gear position.

[0132] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0133] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A trolley, characterized in that, include: The frame includes the pivotally connected upper and lower frame; The canopy mechanism is pivotable relative to the lower frame and is connected to the upper frame; as well as A locking mechanism is provided between the canopy mechanism and the lower frame to restrict or allow the canopy mechanism to pivot relative to the lower frame; During the pivoting process of the upper frame relative to the lower frame, the upper frame can drive the canopy mechanism to retract or expand, and drive the locking mechanism to release, so as to drive the canopy mechanism to pivot in a direction closer to or away from the lower frame.

2. The trolley according to claim 1, characterized in that, When the upper frame pivots toward the lower frame, the upper frame drives the canopy mechanism to retract, and the retracted canopy mechanism pivots toward the lower frame as the upper frame pivots; or When the upper frame pivots away from the lower frame, the upper frame drives the canopy mechanism to open, and the opened canopy mechanism pivots away from the lower frame as the upper frame pivots.

3. The trolley according to claim 1, characterized in that, The canopy mechanism includes a support base and a first canopy strip connected together. The support base is pivotable about a rotation axis relative to the undercarriage frame, so that the first canopy strip can pivot relative to the undercarriage frame. The pivoting process of the upper scaffold relative to the lower scaffold includes a first stage and a second stage. In the first stage, the support base and the first canopy strip are fixed relative to the lower scaffold. In the second stage, the pivoting of the upper scaffold drives the first canopy strip to pivot in a direction closer to or further away from the lower scaffold.

4. The trolley according to claim 3, characterized in that, The canopy mechanism has an open state and a retracted state; The canopy mechanism further includes a second canopy strip, which is fixed relative to the upper frame and can pivot with the upper frame relative to the lower frame. When the canopy mechanism is in the extended state, the first canopy strip and the second canopy strip are far apart from each other; when the canopy mechanism is in the retracted state, the first canopy strip and the second canopy strip are close together.

5. The trolley according to claim 4, characterized in that, The width of the first canopy strip along the first direction is W1, the width of the second canopy strip along the first direction is W2, and the width of the upper frame along the first direction is W3, wherein W1 > W3 > W2.

6. The trolley according to claim 3, characterized in that, The frame also includes a first pivot joint, which includes a first connecting seat and a second connecting seat pivotally connected to each other. The first connecting seat is connected to the upper frame, and the second connecting seat is connected to the lower frame. The support seat is rotatably disposed on the side of the second connecting seat opposite to the first connecting seat about the rotation axis.

7. The trolley according to claim 6, characterized in that, The locking mechanism includes an engaging protrusion and an engaging recess. One of the support base and the second connecting base is provided with the engaging recess, and the other is provided with the engaging protrusion. When the engaging protrusion extends into the engaging recess, the support base is restricted from rotating relative to the second connecting base. When the engaging protrusion disengages from the engaging recess, the support base is allowed to rotate relative to the second connecting base.

8. The trolley according to claim 7, characterized in that, The engagement recess is provided in multiple ways, and the multiple engagement recesses are arranged circumferentially along the rotation axis. In the first stage, the engaging protrusion remains inserted into the current engaging recess. In the second stage, the engaging protrusion can sequentially disengage from the current engaging recess and extend into the adjacent engaging recess to restrict the continuous rotation of the support relative to the second connecting seat.

9. The trolley according to claim 8, characterized in that, The support base is axially movable relative to the second connecting base along the rotation axis to have a first position and a second position; When the support is in the first position, the engaging protrusion extends into the engaging recess; when the support is in the second position, the engaging protrusion disengages from the engaging recess. In the first stage, the support is held in the first position, and in the second stage, the support switches back and forth between the first position and the second position.

10. The trolley according to claim 1, characterized in that, The scaffold also includes a locking and retaining mechanism disposed between the upper scaffold and the lower scaffold. When the upper scaffold pivots relative to the lower scaffold to fold, the locking and retaining mechanism is adapted to lock the upper scaffold and the lower scaffold to restrict the upper scaffold from unfolding relative to the lower scaffold.

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