A folding collapsing module, chassis, frame and cart

Abstract

This invention provides a folding and retracting module, a base frame, a chassis, and a trolley, belonging to the field of mobile device technology. It includes: a first support rod and a second support rod, with a first slider at the first end of the first support rod and a second slider at the first end of the second support rod, the first slider and the second support rod slidingly engaged; wheels are provided at the second ends of both the first and second support rods; a folding and retracting unit, including a first reversing portion located on the upper side of the first support rod and a second reversing portion located on the side of the second support rod, a first force-applying portion on the first slider, and a... The second force-applying part and the first reversing part can be connected to the second force-applying part, and the second reversing part can be connected to the first force-applying part. The advantage is that when the first support rod and the second support rod retract relative to each other, the first slider and the second slider move away from each other. The first force-applying part on the first slider contacts the second reversing part on the second support rod and applies force to make the wheel change from the vertical direction to the horizontal direction, reducing the height space occupied when it is idle. At the same time, it can ensure that the tire tread of the wheel will not contact the ground or other placement surfaces, causing the trolley or other mobile equipment to shake or shift. That is, the wheel can be synchronously flipped and folded during the retraction of the first telescopic rod and the second telescopic rod.

Description

Technical Field

[0001] This invention belongs to the field of mobile device technology, and particularly relates to a folding and retracting module, a base frame, a vehicle frame, and a trolley. Background Technology

[0002] Folding strollers are common means of transportation for children, in which children sit and are pushed by adults. To facilitate their use and storage, the design and manufacturing process of strollers must ensure safety while also meeting the advantages of a lightweight frame, easy folding and unfolding, and a small overall size when folded.

[0003] In current technology, most folding strollers cannot be fully folded, i.e., minimized in size, especially the wheels, which cannot be folded with a single button. This results in the stroller being too bulky when folded, making it inconvenient to store and transport. Furthermore, some folding strollers have wheels that cannot be folded or require manual folding, all of which negatively impact the ease of use of the stroller. Summary of the Invention

[0004] The purpose of this invention is to address the aforementioned problems in existing technologies by proposing a folding and retracting module in which the wheels rotate synchronously with the state adjustment of the support rods on the frame.

[0005] The objective of this invention can be achieved through the following technical solution: a folding and retracting module, comprising:

[0006] A first support rod and a second support rod, wherein a first slider is provided at a first end of the first support rod and a second slider is provided at a first end of the second support rod, the first slider and the second support rod are slidably engaged, and the second slider and the first support rod are slidably engaged;

[0007] Both the second end of the first support rod and the second end of the first support rod are provided with wheels;

[0008] The retractable folding unit includes a first reversing part located on the upper side of the first support rod and a second reversing part located on the side of the second support rod. A first force-applying part is provided on the first slider and a second force-applying part is provided on the second slider. The first reversing part can be connected to the second force-applying part, and the second reversing part can be connected to the first force-applying part.

[0009] Wherein, when the first support rod and the second support rod are in the extended state, the axis of the wheel is parallel in the horizontal direction;

[0010] When the first support rod and the second support rod are in the retracted state, the axis of the wheel is parallel in the vertical direction; during the process of the first support rod switching from the extended state to the retracted state, the first reversing part is connected to the second force-applying part, and the second reversing part is connected to the first force-applying part, thereby realizing the reversing of the wheel.

[0011] In the aforementioned folding and retracting module, the first end of the first support rod is provided with a first rotating groove arranged radially thereon, the first end of the second support rod is provided with a second rotating groove arranged radially thereon, the first slider is provided with a first insertion post, the second slider is provided with a second insertion post, the first insertion post extends into the second rotating groove, the second insertion post extends into the first rotating groove, and the wheel is fixedly connected to the corresponding first support rod and second support rod.

[0012] In one of the folding and retracting modules described above, the first support rod is arranged around the side of the second support rod; or the first support rod and the second support rod are arranged coaxially.

[0013] In the aforementioned folding and retracting module, the first reversing part includes a reversing groove surrounding the first support rod, and the second force-applying part includes a linkage column disposed on the second support rod and extending into the reversing groove. The linkage column is capable of moving along the trajectory of the track groove. When the linkage column is located at one end of the track groove, the axis of the wheel is parallel in the horizontal direction; when the linkage column is located at the other end of the track groove, the axis of the wheel is parallel in the vertical direction.

[0014] In the aforementioned folding and retracting module, when the first support rod and the second support rod change from an extended state to a retracted state, the wheels on the first support rod and the wheels on the second support rod rotate synchronously or asynchronously.

[0015] In the aforementioned folding and retracting module, the first reversing part includes a reversing inclined surface disposed on the second end of the first support rod, and the second force-applying part includes a force-applying inclined surface disposed on the end of the first slider. As the reversing inclined surface and the force-applying inclined surface approach each other, the force-applying inclined surface abuts against the reversing inclined surface and realizes the switching of the axis of the wheel on the first support rod and the second support rod from being parallel in the horizontal direction to the axis of the wheel being parallel in the vertical direction.

[0016] A base frame includes the aforementioned folding and retracting modules, wherein there are two folding and retracting modules, and also includes two connecting rods, wherein the two connecting rods are respectively connected to the second end of the first support rod and the second end of the second support rod.

[0017] In one of the aforementioned chassis configurations, when the first support rod and the second support rod are in a retracted state, the wheels on the two first support rods and the wheels on the two second support rods rotate relative to each other.

[0018] A bicycle frame includes the aforementioned base frame and a trolley assembly. The trolley assembly includes two synchronously operating push rods, each push rod being hinged to a corresponding first slider. A diagonal brace is hinged to the second slider and is hinged to the side of the push rod. When the first and second support rods are in an extended state, a triangle is formed between the axes of the push rods, the diagonal brace, and the first support rod. As the push rods rotate toward the user's position, the first and second support rods change from an extended state to a retracted state.

[0019] A trolley includes the aforementioned frame and a seat. Two push rods each include a first telescopic rod and a second telescopic rod slidably disposed relative to each other. The second telescopic rod is hinged to a first slider. The seat is disposed between the two second telescopic rods, connected to the second telescopic rods, and capable of flipping relative to the second telescopic rods. The seat includes two opposing connecting surfaces, each with a connecting portion connected to the first telescopic rod. As the first telescopic rod retracts relative to the second telescopic rod, the first telescopic rod drives the connecting portion to flip the seat.

[0020] Compared with the prior art, the beneficial effects of the present invention are as follows: when the first support rod and the second support rod retract relative to each other, the first slider and the second slider move away from each other, and the first force-applying part on the first slider contacts the second reversing part on the second support rod to apply force, causing the wheel to change direction from the vertical direction to the horizontal direction, thereby reducing the height space occupied when it is idle. Attached Figure Description

[0021] Figure 1 This is a three-dimensional structural diagram of the trolley in this invention;

[0022] Figure 2 This is a schematic diagram illustrating the use of the folding and shrinking module in Embodiment 2;

[0023] Figure 3 yes Figure 2 A diagram illustrating wheel retraction;

[0024] Figure 4 This is a schematic diagram illustrating the use of the folding module in Embodiment 1;

[0025] Figure 5 This is a schematic diagram showing the wheels on the second support rod flipping and folding first;

[0026] Figure 6This is a schematic diagram showing the wheels on the first support rod flipping and folding first;

[0027] Figure 7 This is a schematic diagram of one of the optional solutions for the chassis;

[0028] Figure 8 This is the second schematic diagram of an optional chassis design;

[0029] Figure 9 This is the third schematic diagram of an optional chassis design;

[0030] Figure 10 This is the fourth schematic diagram of an optional chassis design;

[0031] Figure 11 This is a schematic diagram of the structure of the first slider and the first support rod;

[0032] Figure 12 This is a schematic diagram of the structure of the second slider and the second support rod;

[0033] Figure 13 This is one of the diagrams showing the folded state of the stroller;

[0034] Figure 14 This is the second illustration of the stroller in its folded state;

[0035] Figure 15 This is the third illustration of the stroller in its folded state;

[0036] Figure 16 This is the fourth illustration of the stroller in its folded state;

[0037] Figure 17 This is one of the diagrams showing the connection between the stroller components and the seat;

[0038] Figure 18 This is the second diagram showing the connection between the stroller components and the seat;

[0039] Figure 19 This is the third diagram showing the connection between the stroller components and the seat;

[0040] Figure 20 This is a schematic diagram of one of the optional connection schemes between the seat and the push rod;

[0041] Figure 21 This is the second schematic diagram of an optional connection scheme between the seat and the push rod;

[0042] Figure 22 This is the third schematic diagram of an optional connection scheme between the seat and the push rod;

[0043] Figure 23 This is the fourth diagram illustrating an optional connection scheme between the seat and the push rod;

[0044] Figure 24 This is the fifth diagram illustrating an optional connection scheme between the seat and the push rod;

[0045] Figure 25 This is a cross-sectional view of the grip bar.

[0046] Figure 26 This is a cross-sectional structural diagram of the trolley assembly;

[0047] Figure 27 This is one of the schematic diagrams of the cross-sectional structure of the cart;

[0048] Figure 28 This is the second cross-sectional structural diagram of the cart;

[0049] Figure 29 This is the third cross-sectional structural diagram of the cart;

[0050] Figure 30 This is an exploded structural diagram of the connecting rod and the second support rod.

[0051] In the diagram, 100 is the first support rod; 101 is the second support rod; 102 is the first slider; 103 is the second slider; 104 is the reversing groove; 105 is the linkage column; 106 is the sliding groove; 107 is the reversing inclined plane; 108 is the force-applying inclined plane; 109 is the connecting rod; 200 is the wheel; 300 is the first rotating groove; 301 is the second rotating groove; 302 is the first insertion column; 303 is the second insertion column; 400 is the push rod; 401 is the first telescopic rod; 402 is the second telescopic rod; 403 is the support. Locking component; 404, First unlocking slider; 405, First linkage rod; 406, Unlocking post; 407, Unlocking groove; 408, Third unlocking slider; 409, Second linkage rod; 410, Unlocking button; 411, Unlocking rope; 412, Push rod locking component; 413, Diagonal brace; 414, Hand grip; 500, Gear sleeve; 501, Locking gear; 600, Seat; 601, Connecting surface; 602, Seat support rod; 603, Torsion spring; 604, Elastic component; 605, Transmission gear. Detailed Implementation

[0052] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0053] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0054] Example 1, as Figure 1 , Figures 4-6 As shown, a folding / shrinking module includes:

[0055] A first support rod 100 and a second support rod 101 are provided. A first slider 102 is provided at the first end of the first support rod 100, and a second slider 103 is provided at the first end of the second support rod 101. The first slider 102 is slidably engaged with the second support rod 101, and the second slider 103 is slidably engaged with the first support rod 100.

[0056] Both the second end of the first support rod 100 and the second end of the first support rod 100 are provided with wheels 200;

[0057] The retractable folding unit includes a first reversing part located on the upper side of the first support rod 100 and a second reversing part located on the side of the second support rod 101. A first force-applying part is provided on the first slider 102 and a second force-applying part is provided on the second slider 103. The first reversing part can be connected to the second force-applying part, and the second reversing part can be connected to the first force-applying part.

[0058] When the first support rod 100 and the second support rod 101 are in the extended state, the axis of the wheel 200 is parallel in the horizontal direction.

[0059] When the first support rod 100 and the second support rod 101 are in the retracted state, the axis of the wheel 200 is parallel in the vertical direction; during the process of the first support rod 100 switching from the extended state to the retracted state, the first reversing part is connected to the second force-applying part, and the second reversing part is connected to the first force-applying part, thereby realizing the reversing of the wheel 200.

[0060] In this embodiment, the first support rod 100 and the second support rod 101 form a movable support for a trolley or other movable device. The first support rod 100 and the second support rod 101 in this application can retract or extend relative to each other, meaning they have different structural states when in use and when idle. In particular, the presence of the reversing part and the force-applying part allows the axes of the wheels 200 on the first support rod 100 and the second support rod 101 to be parallel in the horizontal direction when the first support rod 100 and the second support rod 101 are extended (i.e., in the use state). The tire tread of the wheels 200 is in contact with the ground, allowing for the use of the wheels 200... When the first support rod 100 and the second support rod 101 retract relative to each other, the first slider 102 and the second slider 103 move away from each other. The first force-applying part on the first slider 102 contacts the second reversing part on the second support rod 101 and applies force to make the wheel 200 change from the vertical direction to the horizontal direction, reducing the height space occupied when it is idle. At the same time, it can ensure that the tire tread of the wheel 200 will not contact the ground or other placement surfaces, causing the trolley or other mobile equipment to shake or shift. That is, the wheel 200 can be synchronously flipped and folded during the retraction of the first telescopic rod 401 and the second telescopic rod 402.

[0061] Specifically, the first end of the first support rod 100 is provided with a first rotating groove 300 arranged radially thereon, the first end of the second support rod 101 is provided with a second rotating groove 301 arranged radially thereon, the first slider 102 is provided with a first insertion post 302, the second slider 103 is provided with a second insertion post 303, the first insertion post 302 extends into the second rotating groove 301, the second insertion post 303 extends into the first rotating groove 300, and the wheel 200 is fixedly connected to the corresponding first support rod 100 and second support rod 101.

[0062] In this embodiment, the wheel 200 is fixedly connected to the corresponding first support rod 100 or second support rod 101. That is, when the wheel 200 turns, the first support rod 100 and the second support rod 101 rotate synchronously. It can be understood that as the first support rod 100 and the second support rod 101 extend, the first force-applying part connects with the second reversing part to drive the second support rod 101 to rotate, thereby causing the wheel 200 to flip. The second force-applying part connects with the first reversing part to drive the first support rod 100 to rotate, thereby causing the wheel 200 to flip.

[0063] like Figures 7-10 As shown, preferably, the first support rod 100 is arranged around the side of the second support rod 101; or the first support rod 100 and the second support rod 101 are arranged coaxially.

[0064] In this embodiment, as Figure 7 , Figure 8As shown, as an optional configuration, the first support rod 100 is located inside and outside the second support rod 101 in the horizontal direction, such as... Figure 10 As shown, as an optional solution, the first support rod 100 extends into the second support rod 101 or the second support rod 101 extends into the first support rod 100. Both solutions can achieve the contraction and extension of the first support rod 100 and the second support rod 101.

[0065] Specifically, the first reversing part includes a reversing groove 104 surrounding the first support rod 100, and the second force-applying part includes a linkage column 105 disposed on the second support rod 101 and extending into the reversing groove 104. The linkage column 105 can move along the trajectory of the reversing groove 104. When the linkage column 105 is located at one end of the reversing groove 104, the axis of the wheel 200 is parallel in the horizontal direction; when the linkage column 105 is located at the other end of the reversing groove 104, the axis of the wheel 200 is parallel in the vertical direction.

[0066] In this embodiment, a first slider 102 is fixedly mounted on the first end of the first support rod 100, and a linkage post 105 is mounted on the first slider 102. A reversing groove 104 is provided on the side of the first support rod 100. The structure of the second reversing part is the same as that of the first reversing part, that is, a second slider 103 is fixedly mounted on the first end of the second support rod 101, and a linkage post 105 is also provided on the second slider 103. A reversing groove 104 is also provided on the side of the second support rod 101. Therefore, the linkage post 105 on the first slider 102... The column 105 extends into the reversing groove 104 on the second support rod 101, and the linkage column 105 on the second slider 103 extends into the reversing groove 104 on the first support rod 100. The linkage column 105 on the first slider 102 moves along the trajectory of the reversing groove 104, causing the second support rod 101 to rotate and drive the wheel 200 to flip to the horizontal direction. The linkage column 105 on the second slider 103 moves along the trajectory of the reversing groove 104, causing the first support rod 100 to rotate and drive the vehicle to flip to the horizontal direction.

[0067] like Figures 5-6 As shown, more preferably, when the first support rod 100 and the second support rod 101 change from an extended state to a retracted state, the wheels 200 on the first support rod 100 and the wheels 200 on the second support rod 101 rotate synchronously or asynchronously.

[0068] In this embodiment, the length of the steering groove can be set to be equal to the working stroke length of the first slider 102. In this case, the reversing of the wheel 200 requires the linkage column 105 to travel the entire working stroke along with the first slider 102, which results in a poor user experience. Therefore, in this application, the length of the reversing groove 104 is set to be less than the working stroke of the slider. One end or both ends of the reversing groove 104 are provided with a sliding groove 106 extending in a straight direction. When the linkage column 105 moves in the sliding groove 106, the state of the wheel 200 does not change. When the wheel 200 moves into the reversing groove 104, the wheel 200 will change direction. As shown in the figure, as an optional solution, the wheels 200 of the first support rod 100 and the second support rod 101 retract synchronously. As shown in the figure, as an optional solution, the vehicle on the first support rod 100 retracts first or the wheel 200 on the second support rod 101 retracts first.

[0069] Example 2, as Figures 2-3 As shown, the remaining structures are the same as in Embodiment 1, except that: the first reversing part includes a reversing ramp 107 disposed on the second end of the first support rod 100, and the second force-applying part includes a force-applying ramp 108 disposed on the end of the first slider 102. As the reversing ramp 107 and the force-applying ramp 108 approach each other, the force-applying ramp 108 abuts against the reversing ramp 107 and realizes the switching of the axis of the wheel 200 on the first support rod 100 and the second support rod 101 from being parallel in the horizontal direction to being parallel in the vertical direction.

[0070] In this embodiment, another wheel 200 reversing structure is provided. The second end of the first support rod 100 is provided with a reversing ramp 107, and the end of the first slider 102 is provided with a force-applying ramp 108. The force-applying ramp 108 and the reversing ramp 107 are arranged facing each other. In this application, the force-applying ramp 108 and the reversing ramp 107 will only come into contact when the first slider 102 moves close to the end of the second support rod 101, so that the reversing ramp 107 rotates and drives the wheel 200 to reverse.

[0071] It is worth mentioning that there are multiple force-applying inclined surfaces 108, which are spaced out and arranged around the side of the first support rod 100. The number and position of the reversing inclined surfaces 107 correspond one-to-one with those of the force-applying inclined surfaces 108.

[0072] In the third embodiment, the difference from the above two embodiments is that a linkage column 105 is provided on the first slider 102, a reversing groove 104 is provided on the second support rod 101, the linkage column 105 extends into the reversing groove 104, and a force-applying inclined surface 108 is provided on the second slider 103, and a reversing inclined surface 107 is provided on the first support rod 100.

[0073] A base frame includes two folding and retracting modules as described in all the above embodiments, and also includes two connecting rods 109, which are respectively connected to the second ends of the two first support rods 100 and the second end of the second support rod 101.

[0074] In this embodiment, the first support rod 100 and the second support rod 101 pass through the corresponding connecting rod 109 and are rotatably connected to the corresponding connecting rod 109, forming a chassis structure in the vehicle frame between the support rod and the connecting rod 109.

[0075] More preferably, when the first support rod 100 and the second support rod 101 are in the retracted state, the wheels 200 on the two first support rods 100 and the wheels 200 on the two second support rods 101 rotate relative to each other, such as... Figure 13 As shown, the wheel 200 folds inward, and the folded wheel 200 does not extend beyond the frame edge of the chassis.

[0076] like Figures 13-30 As shown, a frame includes the aforementioned base frame and a trolley assembly. The trolley assembly includes two synchronously operating push rods 400. The two push rods 400 are respectively hinged to corresponding first sliders 102. A diagonal brace 413 is hinged to the second slider 103 and is hinged to the side of the push rods 400. When the first support rod 100 and the second support rod 101 are in the extended state, a triangle is formed between the axes of the push rods 400, the diagonal brace 413 and the first support rod 100.

[0077] In this embodiment, a handle 414 is fixedly provided between the two push rods 400 to achieve synchronous operation of the two push rods 400. The two push rods 400 are respectively hinged to the corresponding first slider 102 and connected to the second slider 103 through the diagonal brace 413. When the first support rod 100 and the second support rod 101 are in the extended state, the axis of the push rod 400 forms an acute angle with the axis of the first support rod 100. The axes of the push rod 400, the diagonal brace 413 and the first support rod 100 are... A triangle is formed between them to maintain stability; as the push rod 400 is pressed down, that is, the push rod 400 applies force to the first slider 102 to make it slide, the presence of the diagonal support rod 413 allows the second slider 103 to slide synchronously, that is, the operation of the push rod 400 can drive the first slider 102 and the second slider 103 to slide synchronously, so that the first support rod 100 and the second support rod 101 move relative to each other, realizing the reversal of the wheel 200. As shown in the figure, it is the state after folding and storage, with the push rod 400 against the base frame and the wheel 200 flipped inward for storage.

[0078] More preferably, as the push rod 400 flips toward the user's position, the first support rod 100 and the second support rod 101 change from an extended state to a retracted state.

[0079] In this embodiment, as Figure 1 The diagram shows the usage state of the frame. The axis of the push rod 400 and the axis of the first support rod 100 form an acute angle. When the user stands on the side of this angle, the user is always on this side when pushing or pulling the cart. Therefore, when rotating the push rod 400, the user does not need to change their position. Simply press the push rod 400 down to store the cart.

[0080] Preferably, the first support rod 100 is provided with a support locking member 403. When the first support rod 100 and the second support rod 101 are in the extended state, the support locking member 403 is connected to the second slider 103 to lock the relative position between the second slider 103 and the first support rod 100. The push rod 400 is provided with an unlocking trigger part connected to the support locking member 403. As the position of the push rod 400 changes, the support locking member 403 switches between the locked state and the unlocked state.

[0081] Preferably, the end of the connecting rod 109 is provided with a gear sleeve 500, and each of the first support rods 100 is provided with a locking gear 501 connected to the support locking member 403. The locking gear 501 can only move linearly along the axial direction of the first support rod 100. When the support locking member 403 locks the second slider 103, the locking gear 501 meshes with the gear sleeve 500; when the locking member is in the unlocked state, the locking gear 501 disengages from the gear sleeve 500.

[0082] A trolley includes the frame described above. Two push rods 400 each include a first telescopic rod 401 and a second telescopic rod 402 that are slidably arranged relative to each other. The second telescopic rod 402 is hinged to a first slider 102, and a seat 600 is arranged between the two second telescopic rods 402. The seat 600 is connected to the second telescopic rods 402 and can be flipped relative to the second telescopic rods 402. The seat 600 includes two opposing connecting surfaces 601. A connecting part is provided on the connecting surface 601 and connected to the first telescopic rod 401. As the first telescopic rod 401 retracts relative to the second telescopic rod 402, the first telescopic rod 401 drives the connecting part to flip the seat 600.

[0083] like Figures 27-29As shown, in this embodiment, the support locking member 403 includes a second unlocking slider located inside the first support rod 100. When the frame is in the unfolded state, the second unlocking slider extends out of the first support rod 100 and passes through the second slider 103, so that the first support rod 100 and the second slider 103 are kept in a locked state. The arrangement of the first telescopic rod 401 and the second telescopic rod 402 ensures that when the first telescopic rod 401 retracts relative to the second telescopic rod 402, the end of the first telescopic rod 401 will strike the first support rod 100, which can only move vertically. The first unlocking slider 404 moves upward, and the abutting inclined surface on the first unlocking slider 404 pushes the second unlocking slider inside the first support rod 100 to move horizontally, and it can only move horizontally relative to the first support rod 100. The second unlocking slider and the locking gear 501 inside the first support rod 100 are fixedly connected by the first linkage rod 405. Since the second unlocking slider is provided with an unlocking groove 407, and the first linkage rod 405 is provided with an unlocking pin 406 that extends into the unlocking groove 407, as the second unlocking slider moves, the first unlocking slider 404 moves upward, causing the first unlocking slider 404 to move horizontally. When the linkage rod 405 disengages the locking gear 501 from the gear sleeve 500, the first support rod 100 and the connecting rod 109 can rotate relative to each other, causing the wheel 200 to rotate. The first support rod 100 also contains an elastic reset component connected to the first unlocking slider 404, the second unlocking slider, and the locking gear 501, allowing it to automatically reset under elastic action. As the first slider 102 moves relative to the second support rod 101, the first slider 102 and the component within the second support rod 101 can only move along the axis of the second support rod 101. The inclined abutment surfaces of the third unlocking slider 408 abut against each other. The third unlocking slider 408 is fixed to the locking gear 501 in the second support rod 101 through the second linkage rod 409. The second linkage rod 409 is also provided with an unlocking post 406 that extends into the unlocking groove on the third unlocking slider 408. When the first slider 102 abuts against the inclined abutment surfaces on the third unlocking slider 408, the third unlocking slider 408 moves in the axial direction and drives the second linkage rod 409 to move, thereby causing the locking gear 501 in the second support rod 101 to disengage from the gear sleeve 500.

[0084] like Figures 25-26As shown, it is worth mentioning that the handle 414 is set on the first telescopic rod 401, and the handle 414 is provided with an unlock button 410. When the unlock button 410 is pressed, the unlocking rope 411 connected to the unlock button 410 drives the third linkage column 105 in the first telescopic rod 401 to slide. The third linkage column 105 is also provided with an unlocking column 406. The push rod locking member 412 is provided in the first telescopic rod 401, passing through the first telescopic rod 401 and locking it with the second telescopic rod 402. The push rod locking member 412 is also provided with an unlocking groove 407. The unlocking column 406 extends into the unlocking groove 407. As the third linkage column 105 moves, the push rod 400 moving member retracts into the first support rod 100 to complete the unlocking, so that the first telescopic rod 401 can move relative to the second telescopic rod 402.

[0085] Based on the premise that the first telescopic rod 401 can move relative to the second telescopic rod 402, such as Figures 18-23 As shown, as an optional solution, one end of the connecting surface 601 is hinged to the second telescopic rod 402. The connecting part includes a seat support rod 602 hinged to the other end of the connecting surface 601. The seat support rod 602 is hinged to the end of the first telescopic rod 401. As the first telescopic rod 401 moves relative to the second telescopic rod 402 on the axis, the first telescopic rod 401 drives the seat support rod 602 to rotate, thereby causing the seat 600 to unfold or fold. To make the folding of the seat 600 more convenient, at the hinge point between the seat 600 and the second telescopic rod 402 or at the hinge point between the seat support rod 602 and the first telescopic rod 401... A torsion spring 603 is provided at the contact point. When the seat 600 is unfolded, the torsion spring 603 is stressed and accumulates elastic potential energy. When the first telescopic rod 401 is unlocked and retracted, the seat 600 can be flipped and folded using the release force of the torsion spring 603. Alternatively, an elastic element 604 can be provided in the second telescopic rod 402. The two ends of the elastic element 604 are connected to the ends of the first telescopic rod 401 and the end of the seat support rod 602, respectively. When the first telescopic rod 401 is unfolded relative to the second telescopic rod 402, the elastic element 604 accumulates elastic potential energy. When the first telescopic rod 401 is retracted relative to the second telescopic rod 402, the elastic potential energy is released, pushing the seat support rod 602 to move.

[0086] Based on the premise that the first telescopic rod 401 can move relative to the second telescopic rod 402, such as Figure 24 As shown, as an optional solution, a hinge rod is provided on the connecting surface 601 and rotates to connect with the second telescopic rod 402 to realize the hinged setting of the seat 600 and the second telescopic rod 402. A transmission gear 605 is provided on the hinge rod, and a transmission rack is provided on the first telescopic rod 401 to mesh with the transmission gear 605 so that the seat 600 will rotate synchronously as the first telescopic rod 401 moves.

[0087] It is worth mentioning that, as another optional solution for the trolley assembly in this application, in addition to the first telescopic rod 401 and the second telescopic rod 402, an additional telescopic rod can be provided to achieve a longer adjustment distance. When the push rod 400 is stored, all telescopic rods are located inside the second telescopic rod 402.

[0088] In this application, the push rod 400 is retracted first, that is, the first telescopic rod 401 retracts relative to the second telescopic rod 402. When the first telescopic rod 401 extends to the bottom of the second telescopic rod 402, the first telescopic rod 401 will trigger the locking member of the first slider 102. Then, the push rod 400 is rotated to unlock the first slider 102 and the second slider 103. As the first slider 102 and the second slider 103 slide relative to the second support rod 101 and the first support rod 100, under the action of the reversing part and the force application part, the wheel 200 retracts inward, completing the folding of the entire trolley.

[0089] It should be noted that in this invention, the use of terms such as "first," "second," and "a" is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified. The terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two elements or the interaction between two elements, unless otherwise explicitly specified. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0090] Furthermore, the technical solutions of the various embodiments of the present invention can be combined with each other, but only if they are feasible for those skilled in the art. If the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by the present invention.

[0091] The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of the invention or exceeding the scope defined by the appended claims.

Claims

1. A fold and shrink module characterized by, include: A first support rod and a second support rod, wherein a first slider is provided at a first end of the first support rod and a second slider is provided at a first end of the second support rod, the first slider and the second support rod are slidably engaged, and the second slider and the first support rod are slidably engaged; Both the second end of the first support rod and the second end of the first support rod are provided with wheels; The retractable folding unit includes a first reversing part located on the upper side of the first support rod and a second reversing part located on the side of the second support rod. A first force-applying part is provided on the first slider and a second force-applying part is provided on the second slider. The first reversing part can be connected to the second force-applying part, and the second reversing part can be connected to the first force-applying part. Wherein, when the first support rod and the second support rod are in the extended state, the axis of the wheel is parallel in the horizontal direction; When the first support rod and the second support rod are in the retracted state, the axis of the wheel is parallel in the vertical direction; during the process of the first support rod switching from the extended state to the retracted state, the first reversing part is connected to the second force-applying part, and the second reversing part is connected to the first force-applying part, thereby realizing the reversing of the wheel.

2. A folding and retracting module according to claim 1, characterized in that, The first end of the first support rod is provided with a first rotating groove arranged radially thereon, the first end of the second support rod is provided with a second rotating groove arranged radially thereon, the first slider is provided with a first insertion post, the second slider is provided with a second insertion post, the first insertion post extends into the second rotating groove, the second insertion post extends into the first rotating groove, and the wheel is fixedly connected to the corresponding first support rod and second support rod.

3. A folding and retracting module according to claim 1, characterized in that, The first support rod is arranged around the side of the second support rod; or the first support rod and the second support rod are arranged coaxially.

4. A folding and retracting module according to claim 1, characterized in that, The first reversing part includes a reversing groove surrounding the first support rod, and the second force-applying part includes a linkage post disposed on the second support rod and extending into the reversing groove. The linkage post is capable of moving along the trajectory of the track groove. When the linkage post is located at one end of the reversing groove, the axis of the wheel is parallel in the horizontal direction; when the linkage post is located at the other end of the reversing groove, the axis of the wheel is parallel in the vertical direction.

5. A folding and retracting module according to claim 4, characterized in that, When the first support rod and the second support rod change from an extended state to a retracted state, the wheels on the first support rod and the wheels on the second support rod rotate synchronously or asynchronously.

6. A folding and retracting module according to claim 1, characterized in that, The first reversing part includes a reversing inclined surface disposed on the second end of the first support rod, and the second force-applying part includes a force-applying inclined surface disposed on the end of the first slider. As the reversing inclined surface and the force-applying inclined surface approach each other, the force-applying inclined surface abuts against the reversing inclined surface and realizes the switching of the axis of the wheel on the first support rod and the second support rod from being parallel in the horizontal direction to being parallel in the vertical direction.

7. A base frame, characterized in that, The device includes a folding and shrinking module as described in any one of claims 1-6, wherein there are two folding and shrinking modules, and two connecting rods are also included, wherein the two connecting rods are respectively connected to the second end of the two first support rods and the second end of the second support rods.

8. The base frame according to claim 7, characterized in that, When the first support rod and the second support rod are in the retracted state, the wheels on the two first support rods and the wheels on the two second support rods rotate relative to each other.

9. A vehicle frame, characterized in that, The system includes the base frame as described in claim 7 or 8, and also includes a trolley assembly. The trolley assembly includes two synchronously operating push rods, each of which is hinged to a corresponding first slider. A diagonal brace is hinged to the second slider and is hinged to the side of the push rod. When the first and second support rods are in an extended state, a triangle is formed between the axes of the push rod, the diagonal brace, and the first support rod. As the push rods rotate toward the user's position, the first and second support rods change from an extended state to a retracted state.

10. A trolley, characterized in that, The vehicle includes the frame as described in claim 9, and also includes a seat. The two push rods each include a first telescopic rod and a second telescopic rod that are slidably arranged relative to each other. The second telescopic rod is hinged to the first slider. The seat is disposed between the two second telescopic rods. The seat is connected to the second telescopic rods and can be flipped relative to the second telescopic rods. The seat includes two opposing connecting surfaces. A connecting portion is provided on the connecting surface and connected to the first telescopic rod. As the first telescopic rod retracts relative to the second telescopic rod, the first telescopic rod drives the connecting portion to flip the seat.

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