Foldable stroller

Abstract

A foldable trolley includes a frame. The frame includes a top frame mechanism and a bottom frame mechanism spaced vertically apart, and a support structure disposed between the top frame mechanism and the bottom frame mechanism. One of the top frame mechanism and the bottom frame mechanism includes a plurality of first assemblies and a plurality of first pivot units. The first assemblies are disposed on the support structure. Each first pivot unit is pivotally connected between two of the first assemblies spaced vertically apart, and includes two first pivot rods pivotally connected vertically to each other. Each first pivot rod is pivotally connected to a respective first assembly via a vertically extending first pivot shaft. Each first pivot shaft extends obliquely relative to a vertical direction. With a fixed width, this invention offers a larger accommodating space compared to existing products.

Description

Foldable stroller Technical Field

[0001] This invention relates to a trolley, and more particularly to a foldable trolley. Prior Technology

[0002] Refer to Figures 1 and 2. A current type of foldable trolley includes a frame (not shown in the figure) and a cover fitted onto the frame. The frame includes a top frame mechanism 1 and a bottom frame mechanism (not shown in the figure) arranged at an interval between the top frame mechanism 1 and the bottom frame mechanism, and a support structure (not shown in the figure) disposed between the top frame mechanism 1 and the bottom frame mechanism.

[0003] Since the top frame mechanism 1 is the same as the bottom frame mechanism, it is described as representative. The top frame mechanism 1 includes several assemblies 11 located at several corners, and two fixing rods 12 and two pivot units 13 inserted into these assemblies 11. The fixing rods 12 are spaced apart front to back, and each fixing rod 12 extends left to right. The pivot units 13 are spaced apart left to right, and each pivot unit 13 extends front to back. Each pivot unit 13 includes two pivot rods 131 arranged front to back and pivotally connected to each other. The pivotally connected pivot rods 131 cooperate to form a pivot elbow 132.

[0004] The top frame mechanism 1 can switch between an unfolded state as shown in Figure 1 and a folded state as shown in Figure 2. When each top frame mechanism 1 is in the unfolded state, the pivot rods 131 of each pivot unit 13 are arranged in a straight line extending forward and backward, and the pivot elbows 132 are spaced apart from each other to the left and right. When each top frame mechanism 1 is in the folded state, each pivot rod 131 extends obliquely to the left and right, so that the pivot units 13 are arranged in a <> state. At this time, the pivot elbows 132 are arranged left and right, and the pivot elbows 132 are at the same height.

[0005] Since the pivot elbows 132 are arranged horizontally and at the same height when the top frame mechanism 1 is in the folded state, the folded size of each pivot unit 13 is limited by the pivot elbow 132 of the other pivot unit 13, as shown in Figure 2. That is, the length of each pivot rod 131 cannot exceed half the length of each of the other fixed rods 12, or the unfolded length of each pivot unit 13 cannot exceed the length of each of the other fixed rods 12. Based on the aforementioned limitations, the existing top frame mechanism 1 of the foldable trolley can only be designed to be approximately square, and further improvements are needed. Summary of the Invention

[0006] The purpose of this invention is to improve at least one of the disadvantages of the prior art.

[0007] This novel foldable trolley includes a frame. The frame includes a top frame mechanism and a bottom frame mechanism spaced vertically apart, and a support structure disposed between the top frame mechanism and the bottom frame mechanism. One of the top frame mechanism and the bottom frame mechanism includes a plurality of first assemblies and a plurality of first pivot units. The first assemblies are disposed on the support structure. Each first pivot unit is pivotally connected between two of the first assemblies spaced vertically apart, and includes two first pivot rods pivotally connected vertically to each other. Each first pivot rod is pivotally connected to a respective first assembly via a vertically extending first pivot shaft. Each first pivot shaft extends obliquely relative to a vertical direction.

[0008] The advantage of this invention is that, since each of the first pivot rods is pivotally connected to the respective first assembly at an inclination relative to the vertical direction, when the frame is folded, the first pivot rod units can be staggered vertically without interfering with each other, so that the length of each first pivot rod unit is no longer limited by the other first pivot rod unit and can be extended. Simple Explanation of the Diagram

[0009] Other features and effects of this novel invention will be clearly presented in the embodiments with reference to the drawings, wherein: Figure 1 is a top view illustrating the top frame mechanism of an existing foldable trolley in an unfolded state; Figure 2 is a top view illustrating that the top frame mechanism is in a folded state; Figure 3 is a perspective view illustrating one embodiment of the new foldable trolley, in which the embodiment is in a fully unfolded state; Figure 4 is an partially exploded perspective view illustrating the assembly relationship of one of the first pivot units, one of the second pivot units, and one of the second pivot units in this embodiment. Figure 5 is an incomplete sectional view illustrating the pivot structure between one of the first pivot rods and one of the first assemblies located at the front right. Figure 6 is an incomplete sectional view illustrating the pivot structure between another first pivot rod and another first assembly located at the right rear. Figure 7 is an incomplete sectional view illustrating the pivot structure between another first pivot rod and another first assembly located at the left front; Figure 8 is an incomplete sectional view illustrating the pivot structure between the last first pivot rod and the last first assembly located at the left rear. Figure 9 is an incomplete and partially exploded perspective view illustrating the assembly relationship of one of the first pivot units in this embodiment; Figure 10 is an incomplete sectional view. The section passes through the two first pushing portions of a first operating member of one of the first pivot units, illustrating the structure of the first pivot unit. A first snap-fit ​​member of the first pivot unit is in a first snap-fit ​​position, and the first pivot unit is in a first unfolded state. Figure 11 is an incomplete cross-sectional view illustrating the structure of one of the second pivot units in this embodiment, and the second pivot unit is in a second unfolded state; Figure 12 is an incomplete and partially exploded 3D diagram illustrating the assembly relationship of one of the second pivot units; Figure 13 is an incomplete sectional view illustrating the structure of one of the second pivot units. The section passes through the two second pushing portions of a second operating member of one of the second pivot units, and a second locking member of one of the second pivot units is in a first locking position. Figure 14 is a perspective view illustrating that this embodiment is in a folded-down state; Figure 15 is an incomplete cross-sectional view illustrating that the first snap-fit ​​member of one of the first pivot units is in a second snap-fit ​​position; Figure 16 is an incomplete sectional view illustrating that one of the second pivot elements is in a second folded-back state; and Figure 17 is an incomplete sectional view illustrating that the second latching member of one of the second pivot units is in a second latching position. Implementation

[0010] Referring to Figures 3 and 4, one embodiment of this novel foldable stroller can be used to push pets or goods, therefore, the uses of this embodiment are varied and not particularly limited. This embodiment includes a frame 21, several wheels 22 mounted under the frame 21, and a cover (not shown) that fits onto the frame 21.

[0011] The frame 21 includes a top frame mechanism 3 and a bottom frame mechanism 4 spaced apart from each other, a support structure 5 disposed between the top frame mechanism 3 and the bottom frame mechanism 4, and a handle mechanism 6 pivotally connected to the top frame mechanism 3 and capable of swinging relative to the top frame mechanism 3.

[0012] In the following description, the directions will be explained from the observer's perspective, including front, back, left, right, up, and down. That is, the position of the handle mechanism 6 is considered the front. Based on the aforementioned directional definitions, Figure 4 mainly shows the disassembled parts on the right side of this embodiment.

[0013] The length direction of the top frame mechanism 3 is the same as the front-to-back direction, and the width direction is the same as the left-to-right direction, so the top frame mechanism 3 is rectangular. The top frame mechanism 3 includes four first assembly parts 31 located at the four corners, two first fixing rods 32 assembled between the first assembly parts 31, two first pivot units 33, and two first pivot units 34 respectively mounted on the first pivot units 33.

[0014] Each of the first assemblies 31 is a connector into which each of the first fixing rods 32 can be inserted. Each of the first assemblies 31 can also be inserted into the support structure 5 and thus mounted on the support structure 5. Each of the first assemblies 31 includes a first seat 311 that extends front to back and is pivotally connected to one end of each of the first pivot units 33. The specific pivoting method will be described in later paragraphs.

[0015] Each of the first fixing rods 32 is a hollow round rod, or a round tube. The two opposite ends of each first fixing rod 32 are respectively inserted into the first assembly parts 31 that are spaced apart from each other.

[0016] Each of the first pivot units 33 is pivotally connected between two first assemblies 31 spaced apart from each other, and includes two first pivot rods 331 that are pivotally connected to each other axially and vertically through each of the first pivot units 34.

[0017] Each of the first pivot rods 331 is a hollow flat rod or flat tube with a quadrilateral cross section.

[0018] Referring to Figures 5, 6, 7, and 8, each of the first pivot rods 331 is pivotally connected to the first seat portion 311 of each of the respective first assembly 31, with a first pivot shaft 332 extending obliquely upwards and downwards as its axis. Each of the first pivot shafts 332 extends obliquely relative to a vertical direction D1. Specifically, each of the first pivot shafts 332 extends along an oblique direction D2. The oblique angle A1 between the oblique direction D2 and the vertical direction D1 is 7 degrees, but in practice it can also be 5 to 10 degrees. As can be seen from Figures 5 and 6, each of the first pivot shafts 332 located on the right side of the frame 21 in Figures 5 and 6 extends obliquely downwards towards the interior of the frame 21. As can be seen from Figures 7 and 8, each of the first pivot shafts 332 located on the left side of the frame 21 in Figures 7 and 8 extends obliquely downwards towards the exterior of the frame 21.

[0019] Referring to Figures 4, 9, and 10, each of the first pivot units 34 provides axial vertical pivoting for the first pivot rods 331 of each of the other first pivot units 33 to be pivotally connected to each other. Each of the first pivot units 33 includes a first locking seat 35 and a second locking seat 36 respectively sleeved on the first pivot rods 331 of each of the other first pivot units 33, a first locking member 37 inserted in the first locking seat 35 and the second locking seat 36, a first operating member 38 inserted in the first locking seat 35, and a first elastic member 39 located between the second locking seat 36 and the first locking member 37.

[0020] Each first latching seat 35 is located above each second latching seat 36 and includes a first socket portion 351 that fits onto each first pivot rod 331, and a first round seat portion 352. Each first socket portion 351 is fixed to each first pivot rod 331. Each first round seat portion 352 forms a first latching groove 353 that is concave from bottom to top and opens towards the second latching seat 36, and a first insertion groove 354 that is concave from top to bottom. Each first insertion groove 354 is used to receive each first operating member 38.

[0021] Each of the second latching seats 36 includes a second sleeve portion 361 that is fitted onto each of the respective first pivot rods 331, and a second round seat portion 362. Each of the second sleeve portions 361 is fixed to each of the respective first pivot rods 331. Each of the second round seat portions 362 forms a second latching groove 363 that is recessed from top to bottom and opens toward the first latching seat 35, and includes a positioning post 364 located in the second latching groove 363. Each of the second latching grooves 363 cooperates with each of the respective first latching grooves 353 to form a first moving space S1 in which each of the respective first latching members 37 can move up and down.

[0022] Each of the positioning posts 364 extends along an inclined axis L1. The direction of extension of each inclined axis L1 is the same as the inclined direction D2. (Please refer to Figures 6 and 8 for illustration. In Figure 10, since the cutting surface extends along the inclined axis L1, the inclined axis L1 is not inclined in Figure 10.)

[0023] The first round seat portion 352 of each first latching seat 35 and the second round seat portion 362 of each second latching seat 36 are coaxial with the inclined axis L1 and can rotate relative to each other about the inclined axis L1.

[0024] Each of the first snap-fit ​​pieces 37 is rectangular and is fitted onto the positioning post 364 of each of the second snap-fit ​​pieces 36. When each of the first snap-fit ​​pieces 37 is simultaneously engaged in each of the first round seat portion 352 and each of the second round seat portion 362, it can prevent the first round seat portion 352 and the second round seat portion 362 from rotating relative to each other.

[0025] Each of the first operating members 38 includes a first pressing portion 381 protruding from the respective first latching seat 35, and two first abutting portions 382 inserted into the respective first insertion slots 354 of the respective first latching seat 35 and capable of protruding into the respective first latching slots 353 of the respective first moving space S1. (See FIG15 for schematic diagram) Each first abutting portion 382 is movable in the respective first insertion slots 354 and the respective first latching slots 353. Each first abutting portion 382 and the respective first elastic member 39 are respectively located on two opposite sides of the respective first latching member 37.

[0026] Referring to Figures 3, 4, and 11, the length direction of the bottom frame mechanism 4 is the same as the front-to-back direction, and the width direction of the bottom frame mechanism 4 is the same as the left-to-right direction. Therefore, the bottom frame mechanism 4 is rectangular.

[0027] The base frame mechanism 4 includes four second assembly parts 41 located at the four corners, and two second fixing rods 42 and two second pivot units 43 assembled between the second assembly parts 41.

[0028] Each of the second assemblies 41 is a connector into which each of the second fixing rods 42 can be inserted. Each of the second assemblies 41 can also be inserted into the support structure 5 and is disposed on the support structure 5. Each of the second assemblies 41 can also be inserted into each of the wheels 22. Each of the second assemblies 41 is located below each of the first assemblies 31 and is vertically spaced from each of the first assemblies 31.

[0029] Each of the second pivot units 43 is located below each of the respective first pivot units 33, and is vertically spaced from each of the respective first pivot units 33. Each of the second pivot units 43 includes two second pivot rods 430 connected in a front-to-back arrangement, a first pivot member 431 fixed to one of the second pivot rods 430, a second pivot member 432 fixed to the other second pivot rod 430, and a pin 433 inserted into the first pivot member 431 and the second pivot member 432.

[0030] Each of the second pivot rods 430 is in the shape of a square tube. The second pivot rods 430 of the same second pivot rod unit 43 are pivotally connected together axially from left to right through the first pivot member 431, the second pivot member 432 and the pin member 433. Each of the second pivot rods 430 is pivotally connected to a different second assembly 41 from left to right.

[0031] Each of the first pivot members 431 is fixed to the bottom of one of the second pivot rods 430 of the same second pivot unit 43. Each of the first pivot members 431 is inverted U-shaped and includes two first pivot ears 431a spaced apart from each other (only one is shown in the figure as a representative due to perspective and cross-section).

[0032] Each of the second pivot members 432 has an inverted U-shaped cross-section and spans across the junction of the second pivot rods 430 of the same second pivot unit 43. One end of each of the first pivot members 431 is fixed to another second pivot rod 430 of the same second pivot unit 43 and includes two second lugs 432a. The position of each second lug 432a corresponds to the position of the respective first lug 431a.

[0033] Each of the pins 433 is inserted into the first pivot lugs 431a and the second pivot lugs 432a of the same second pivot unit 43, so that each of the first pivot members 431 and the respective second pivot members 432 are pivotally connected to each other, and the second pivot rods 430 of the same second pivot unit 43 are pivotally swung relative to each other.

[0034] Referring to Figures 4, 12, and 13, the handle mechanism 6 includes a U-shaped handle 61 and two second pivot units 62 for the handle 61 to pivot relative to the top frame mechanism 3.

[0035] Each of the second pivot units 62 includes a first pivot seat 63 integrally connected to each of the first assemblies 31, a second pivot seat 64 disposed at one end of the handle 61, a gear-shaped second locking member 65 disposed between the first pivot seat 63 and the second pivot seat 64, and a second operating member 66 and a second elastic member 67 located on two opposite sides of the second locking member 65.

[0036] Each of the first pivot seats 63 is circular in shape. Inside each first pivot seat 63, a first slot 631 with a shape matching that of the respective second latching member 65 is formed. The opening of each first slot 631 faces the respective second pivot seat 64, and each first slot 631 includes a plurality of first limiting groove areas 631a arranged at intervals in an arc direction. Each first pivot seat 63 also includes a positioning shaft 632 located in the first slot 631.

[0037] Each of the second pivot seats 64 is circular in shape. Inside each second pivot seat 64 is formed a second slot 641 whose shape matches that of the second latching member 65, and a second insertion groove 642 recessed into the second slot 641. The opening of each second slot 641 faces the respective first pivot seat 63, and each second slot 641 includes a plurality of second limiting groove areas 641a spaced apart in the arc direction. The number and size of these second limiting groove areas 641a correspond to the number and size of the respective first limiting groove areas 631a. Each second slot 641, in conjunction with the respective first slot 631, forms a second moving space S2 that allows the respective second latching member 65 to move laterally left and right.

[0038] Each of the protruding teeth of the second snap-fit ​​member 65 can be snapped into the first limiting groove area 631a and the second limiting groove area 641a of the same second pivot unit 62.

[0039] Each of the second operating members 66 includes a second pressing portion 661 protruding from the respective second pivot seat 64, and two second pushing portions 662 inserted in the respective second pivot seat 64 and capable of protruding into the respective second slots 641 of the respective second moving space S2 (see FIG17 for schematic diagram). Each of the second pushing portions 662 and the respective second elastic member 67 are respectively located on two opposite sides of the respective second locking member 65.

[0040] The support structure 5 includes several vertically extending support rods 51. Each support rod 51 is inserted between the first assembly 31 and the second assembly 41, which are vertically spaced from each other.

[0041] These wheels 22 are used for movement on the ground in this embodiment. The cover (not shown) is used to construct a carrying space or a accommodating space. Since these wheels 22 and the cover are common knowledge, further illustration and description are omitted.

[0042] Referring to Figures 3 and 14, this embodiment can switch between a fully unfolded state as shown in Figure 3 and a folded state as shown in Figure 14.

[0043] When this embodiment is in the fully deployed state shown in Figure 3, each of the first pivot units 33 is in a first deployed state with straight front and rear extension, each of the second pivot units 43 is in a second deployed state with straight front and rear extension, and the handle mechanism 6 is in a third deployed state with tilted upward and forward extension protruding from the top frame mechanism 3.

[0044] When this embodiment is in the folded state of the whole vehicle as shown in FIG14, each of the first pivot units 33 is in a first folded state in which the first pivot rods 331 extend to the left and right and are arranged side by side, each of the second pivot units 43 is in a second folded state in which the second pivot rods 430 extend up and down and are arranged side by side, and the handle mechanism 6 is in a third unfolded state in which it extends vertically from the top frame mechanism 3 toward the bottom frame mechanism 4.

[0045] When each of the first pivot units 33 is in the first folded state, the first pivot units 33 are arranged vertically to each other, and one of the first pivot units 34 is located above the other first pivot unit 34.

[0046] Next, the operation method for changing from the fully unfolded state to the folded state of the vehicle in this embodiment will be explained.

[0047] Referring to Figures 9, 10, and 15, pressing the first pressing portion 381 of the first operating member 38 of each first pivot unit 34 causes the first pushing portions 382 of each first operating member 38 to push each individual first latching member 37 against each individual second latching seat 36. In this way, each first latching member 37 can be changed from the first latching position shown in Figure 10 to the second latching position shown in Figure 15.

[0048] When each of the first latching members 37 is in the first latching position, each of the first latching members 37 is located in the respective first latching groove 353 and the respective second latching groove 363. That is, each of the first latching members 37 is latched between the respective first round seat portion 352 and the respective second round seat portion 362. In this way, each of the first round seat portions 352 and the respective second round seat portions 362 cannot rotate relative to each other. When each of the first latching members 37 is in the second latching position, each of the first latching members 37 is located only in the respective second latching groove 363, and not in the respective first latching groove 353. At this time, each of the first round seat portions 352 and the respective second round seat portions 362 can rotate relative to each other about the positioning post 364 (inclined axis L1) of the second latching seat 36.

[0049] In other words, by pressing the first operating member 38 of the first pivot unit 34 and pushing each of the first pivot units 34 toward the other, each of the first pivot units 33 can be changed from the first unfolded state to the first folded state.

[0050] Referring to Figures 14, 11, and 16, during the process of each first pivot unit 33 changing from the first unfolded state to the first folded state, the support rods 51 that are spaced apart from each other will move closer to each other. Therefore, each second pivot unit 43 will also be compressed and change from the second unfolded state shown in Figure 11 to the second folded state shown in Figure 15. When each second pivot unit 43 is in the second unfolded state, each second pivot member 432 is laid across and covers the junction of the second pivot rods 430 of the same second pivot unit 43, which can improve the load-bearing capacity and connection stability of the second pivot rods 430.

[0051] Referring to Figures 3, 13, and 17, when the top frame mechanism 3 and the bottom frame mechanism 4 are folded, the second pressing portion 661 of the second operating member 66 of each second pivot unit 62 can be further pressed, causing the second pushing portions 662 of each second operating member 66 to push each second latching member 65 against each first pivot seat 63. In this way, each second latching member 65 can be changed from the first latching position shown in Figure 13 to the second latching position shown in Figure 17.

[0052] When each of the second latching members 65 is in the first latching position, each of the second latching members 65 is located in the respective first latching slot 631 and the respective second latching slot 641. That is, each of the second latching members 65 is located at the junction of the respective first pivot seat 63 and the respective second pivot seat 64. In this way, each of the first pivot seats 63 and the respective second pivot seats 64 cannot rotate relative to each other. When each of the second latching members 65 is in the second latching position, each of the second latching members 65 is located only in the respective first latching slot 631, and not in the respective second latching slot 641. At this time, each of the first pivot seats 63 and the respective second pivot seats 64 can rotate relative to each other about the positioning axis 632 of the first pivot seat 63.

[0053] In other words, by pressing the second operating member 66 of the second pivot unit 62 and pivoting the handle member 61 downward, the handle mechanism 6 can be changed from the third unfolded state to the third folded state.

[0054] Furthermore, each of the second pivot units 62 is unique in that the number, size, and position of the second limiting groove areas 641a of each of the second slots 641 correspond to the number, size, and position of the first limiting groove areas 631a of each of the respective first slots 631. In this way, when the handle 61 pivots and changes position, each first limiting groove area 631a can still correspond to a new second limiting groove area 641a. When the user releases each of the second operating members 66, causing each of the second elastic members 67 to push each of the respective second locking members 65 back to its original position, the handle 61 can be positioned in the pivoted position. That is, through the gear-shaped second locking members 65, the first slots 631, and the second slots 641 of each of the second pivot units 62, the handle 61 can pivot and be positioned in a variety of different positions.

[0055] Referring to Figures 3, 5, and 14, the advantages of this novel foldable trolley are as follows: Since each of the first pivot rods 331 is pivotally connected to the respective first assembly 31 at an incline relative to the vertical direction D1, when the frame 21 is folded, the first pivot units 33 and the first pivot connection units 34 can be staggered vertically as shown in Figure 14. In other words, the first pivot units 33 and the first pivot connection units 34 do not hinder each other's lateral movement during the folding and deformation process. As a result, because the activity space of each first pivot unit 33 is no longer limited by the other first pivot unit 33, the length of each first pivot unit 33 can be increased compared to the corresponding length of existing products. Therefore, this novel trolley can provide a larger capacity compared to existing products, given the same left and right width.

[0056] The second feature of this invention is that the first pivot units 33 can be folded laterally, and the second pivot units 43 can be folded vertically. Therefore, this invention utilizes two different directions in three-dimensional space for folding. The aforementioned design allows each second pivot unit 43 to remain foldable even as the length of each individual first pivot unit 33 increases. Specifically, since the first pivot units 33 fold laterally, they do not excessively occupy vertical space after folding. This provides ample room for the second pivot units 43 to fold upwards, allowing them to be housed among the support rods 51 of the support structure 5.

[0057] In addition, in different embodiments of this novel invention, the rods used in this embodiment can be hollow rods or tubes, or solid rods or bars, and the cross-section of the rods can be circular or rectangular, and are not limited to the specific shape disclosed in the embodiments.

[0058] The above description is merely an embodiment of this invention and should not be construed as limiting the scope of the patent application of this invention. Furthermore, any simple equivalent variations and modifications made in accordance with the scope of the patent application and the patent specification of this invention should also be covered by the scope of the patent application of this invention.

[0059] 21: Chassis 22: Wheel 3: Top frame mechanism 31: First assembly component 311: First Seat 32: First fixing rod 33: First pivot unit 331: First pivot rod 332: First pivot shaft 34: First pivot unit 35: First card slot 351: First Set of Connecting Sections 352: First circular base 353: First card slot 354: First insertion slot 36: Second card slot 361: Second Socket 362: Second round seat part 363: Second card slot 364: Positioning Post 37: First card receiving 38: First operating component 381: First pressing part 382: First Pushing Section 39: First elastic element 4: Base frame mechanism 41: Second assembly component 42: Second fixing rod 43: Second pivot unit 430: Second pivot rod 431: First pivot component 431a: First pivot 432: Second pivot component 432a: Second pivot 433: Pin 5: Supporting Structure 51: Support rod 6: Handle Mechanism 61: Handle component 62: Second pivot unit 63: First pivot 631: First Card Slot 631a: First limiting groove area 632: Positioning axis 64: Second pivot 641: Second Card Slot 641a: Second limiting groove area 642: Second insertion slot 65: Second card connector 66: Second operating component 661: Second pressing part 662: Second Pushing Section 67: Second elastic element A1: Inclination Angle D1: Vertical direction D2: Inclination direction L1: Inclined axis S1: First Movement Space S2: Second Movement Space

Claims

1. A foldable trolley, comprising: a frame including a top frame mechanism and a bottom frame mechanism spaced vertically apart from each other, and a support structure disposed between the top frame mechanism and the bottom frame mechanism, one of the top frame mechanism and the bottom frame mechanism including a plurality of first assemblies and a plurality of first pivot units, the first assemblies being disposed on the support structure, each of the first pivot units being pivotally connected between two of the first assemblies spaced vertically apart, and including two first pivot rods pivotally connected vertically to each other, each of the first pivot rods being pivotally connected to each of the respective first assemblies via a vertically extending first pivot shaft, each of the first pivot shafts extending obliquely relative to a vertical direction.

2. The foldable stroller as described in claim 1, wherein, Each of the first pivot shafts extends along an inclined direction, the inclined direction being at an angle of 5 to 10 degrees to the vertical direction.

3. The foldable stroller as described in claim 1, wherein, The top frame mechanism also includes several first pivot units, each of which allows the first pivot rods of the respective first pivot units to pivot with each other. Each pivot unit includes a first locking seat and a second locking seat respectively sleeved on the first pivot rods of the respective first pivot units, a first locking member inserted in the first locking seat and the second locking seat, a first operating member inserted in the first locking seat, and a first elastic member located between the second locking seat and the first locking member.

4. The foldable stroller as described in claim 3, wherein, Each of the first latching seats forms a first latching groove with an opening facing the respective second latching seat, and each of the second latching seats forms a second latching groove with an opening facing the respective first latching seat. Each first latching groove and the respective second latching groove cooperate to form a first moving space for each of the first latching members to move. Each of the first operating members includes a first pressing part protruding from the respective first latching seat, and at least one first pushing part inserted in the respective first latching seat and able to protrude into the respective first moving space. The at least one first pushing part and the respective first elastic member are respectively located on two opposite sides of the respective first latching member.

5. The foldable stroller as described in claim 4, wherein, Each of the first locking seats includes a first circular seat portion, and each of the second locking seats includes a second circular seat portion. Each of the first circular seat portions and the respective second circular seat portions are coaxial with an inclined axis and can rotate relative to each other about the inclined axis.

6. The foldable stroller as described in claim 4, wherein, Each of the first snap-fit ​​components is in the shape of a rectangular block.

7. The foldable trolley as claimed in claim 1 further includes a handle mechanism, the handle mechanism including a handle member and a plurality of second pivot units for the handle member to pivot relative to the top frame mechanism, each of the second pivot units including a first pivot seat disposed on a respective first assembly, a second pivot seat disposed at one end of the handle member, a second locking member disposed between the first pivot seat and the second pivot seat, a second operating member inserted into the second pivot seat, and a second elastic member located between the first pivot seat and the second locking member.

8. The foldable stroller as described in claim 7, wherein, Each of the first pivot seats forms a first slot with an opening facing the respective second pivot seat, and each of the second pivot seats forms a second slot with an opening facing the respective first pivot seat. Each first slot and the respective second slot cooperate to form a second moving space for each of the respective second locking members to move. Each of the second operating members includes a second pressing part protruding from the respective second pivot seat, and at least one second pushing part inserted in the respective second pivot seat and protruding into the respective second moving space. The at least one second pushing part and the respective second elastic member are respectively located on two opposite sides of the respective second locking member.

9. The foldable stroller as described in claim 8, wherein, Each of the second snap-fit ​​components is gear-shaped.

10. The foldable stroller as described in claim 1, wherein, The other of the top frame mechanism and the bottom frame mechanism includes several second assemblies and several second pivot units. The second assemblies are disposed on the support structure. Each second assembly is vertically spaced from each of the other first assemblies. Each second pivot unit is vertically spaced from each of the other first pivot units. Each second pivot unit is pivotally connected between two of the second assemblies that are spaced in front and behind, and includes two second pivot rods that are pivotally connected to each other axially in the left and right directions. Each second pivot rod is pivotally connected to each of the other second assemblies axially in the left and right directions.

11. The foldable stroller as described in claim 10, wherein, Each of the second pivot units includes a first pivot member fixed to one of the second pivot rods, a second pivot member fixed to the other of the second pivot rods, and a pin extending laterally and inserted into the first pivot member and the second pivot member.

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