Frame structure of foldable baby carriage

Abstract

The utility model relates to the technical field of baby carriages, and discloses a frame structure of a foldable baby carriage, which comprises a front leg, a rear leg, a connecting part, a rear connecting rod, a backrest rod, a front connecting rod, a grab rail, a locking structure and the like. In the folding process, the backrest rod, the front connecting rod and the rear connecting rod are close to the rear legs from the rear, and the front legs are close to the rear legs from the front. Therefore, after the locking of the locking structure is released, the grab rail is lifted, so that the rear wheel is separated from the ground, the front wheel is in contact with the ground, and the front wheel and the upper end of the grab rail are in an up-down state, and at the moment, the whole frame structure can be folded and stored by pressing downwards. The whole folding and storing process can be achieved with one hand, a certain part does not need to be folded firstly, a grab rail or a related structure does not need to be disassembled, and the problems that in the prior art, a folding baby carriage is complex in structure, the folding process is not easy and convenient enough, and the operation difficulty is large for a user holding a baby are solved.

Description

Technical Field

[0001] This utility model relates to the field of stroller technology, specifically to a frame structure for a foldable stroller. Background Technology

[0002] A stroller (also known as a baby walker or baby carriage) is a portable means of transportation specifically designed for infants and toddlers, making it convenient for parents or caregivers to take their babies out. There are many styles of strollers available, including single-person and double-person strollers, single-wheeled and multi-wheeled strollers, push-pull strollers, and flat-push strollers, etc. Consumers can choose different styles of strollers according to their preferences and needs.

[0003] Foldable strollers were designed for ease of carrying and storage. The core design principles of foldable strollers are portability and functionality. When folded, they are compact enough to fit in a car trunk or be taken on an airplane (some even meet airline size requirements).

[0004] For example, Chinese utility model patent CN105691435B discloses a foldable stroller, including a front linkage mechanism, a rear linkage mechanism, a seat portion, a seat cushion rod assembly, a backrest portion, and a backrest rod assembly. The front linkage mechanism includes front legs, each having an upper end and a lower end on which a front wheel assembly is mounted. The rear linkage mechanism includes rear legs, each having an upper end and a lower end on which a rear wheel assembly is mounted. The seat cushion rod assembly supports the seat portion. The backrest rod assembly supports the backrest portion. When the foldable stroller is moved from its unfolded state to its folded state: the lower ends of the front and rear legs move towards each other, bringing them closer together until the distance between them reaches its minimum. At this point, the front wheel assembly of the front leg and the rear wheel assembly of the rear leg come together to contact or nearly contact each other. The foldable stroller has a small overall size when folded, making it easy to carry and better preventing soiling.

[0005] This stroller can be folded and stored, and its volume is greatly reduced after folding, making it easy to carry. However, its structure is relatively complex. The folding process requires folding the backrest first, and then folding the entire frame. The whole folding and storage process is not simple and is difficult for users holding babies to operate. Utility Model Content

[0006] The technical problem solved by this utility model is that the existing folding stroller has a relatively complex structure and the folding process is not simple enough, making it difficult for users holding babies to operate.

[0007] The objective of this utility model can be achieved through the following technical solutions:

[0008] A frame structure for a foldable stroller includes:

[0009] Forelegs;

[0010] The hind leg has a first transition point between its upper and lower ends;

[0011] A connecting part is fixedly disposed at the upper end of the hind leg, and the upper end of the front leg is hinged to the connecting part;

[0012] The rear link, the lower end of which is hinged to the rear leg at the first transition position;

[0013] A backrest rod, the lower end of which is hinged to the upper end of the rear connecting rod, and the backrest rod has a second transition position;

[0014] The front link has its lower end hinged to the connecting part and its upper end hinged to the backrest rod at the second transition position.

[0015] A handrail, the lower end of which is hinged to the middle of the rear connecting rod, and a third transition position is provided on the handrail, at which the handrail and the front connecting rod are hinged;

[0016] A locking structure is provided for locking and unlocking the hinged connection between the upper end of the rear link and the lower end of the backrest rod.

[0017] In one embodiment of this utility model: a first support rod is fixedly provided between the two front legs, and a foot pedal structure is fixedly provided on the first support rod.

[0018] In one embodiment of this utility model: a front wheel is provided at the lower end of the front leg, and the front wheel is a swivel wheel structure.

[0019] In one embodiment of this utility model, a second support rod is fixedly installed between the two hind legs.

[0020] In one embodiment of this utility model: a rear wheel is provided at the lower end of the rear leg, and the rear wheel is a swivel wheel structure or a directional wheel structure.

[0021] In one embodiment of this utility model: a brake structure is provided on the rear wheel.

[0022] In one embodiment of this utility model, the length of the front leg is smaller than the length of the hind leg.

[0023] In one embodiment of this utility model, the distance between the two front wheels is less than the distance between the two rear wheels.

[0024] In one embodiment of this utility model, a seat structure is further provided. One end of the seat structure is hinged to the rear connecting rod, and the connection point is located between the lower end of the armrest and the lower end of the rear connecting rod. The other end of the seat structure is hinged to the connecting part through a connecting rod.

[0025] In one embodiment of this utility model: a shielding frame structure is further provided, wherein the shielding frame structure is hinged to the rear connecting rod at the second transition position.

[0026] The frame structure of the foldable stroller according to this utility model has at least one of the following technical effects:

[0027] This application provides a frame structure for a foldable stroller, including front legs, rear legs, a connecting part, a rear link, a backrest bar, a front link, an armrest bar, and a locking structure. During the transition from an unfolded state to a folded state, the lower ends of the front legs and the lower ends of the rear legs move towards each other, bringing them closer together. At this time, the front wheel assembly of the front legs and the rear wheel assembly of the rear legs come together until they are in contact or nearly in contact. The upper ends of the front link and the rear link move towards the lower ends of the rear legs, bringing them closer together. Finally, the front link, the rear link, and the rear legs come together until they are in contact or nearly in contact. The upper end of the backrest bar moves towards the upper ends of the rear legs, bringing them closer together. Finally, the backrest bar and the front link come together until they are in contact or nearly in contact. During the folding process, the backrest bar, front link, and rear link move towards the rear legs from the rear, while the front legs move towards the rear legs from the front. Therefore, after releasing the locking mechanism, lifting the armrest bar causes the rear wheels to lift off the ground while the front wheels remain in contact with the ground. With the front wheels and the upper part of the armrest bar in an up-down position, pressing down at this point folds the entire frame structure for storage. The entire folding process can be completed with one hand, without needing to fold any part first or remove the armrest bar or related structures. This solves the problem of existing folding strollers having complex structures, inconvenient folding processes, and being difficult for users holding infants to operate.

[0028] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0029] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood in conjunction with the following description of the embodiments with reference to the accompanying drawings. Obviously, the drawings described below are merely some embodiments of this utility model, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort. Wherein:

[0030] Figure 1 This is a three-dimensional structural diagram of the frame structure of a foldable stroller of this utility model in its unfolded state.

[0031] Figure 2 This is a three-dimensional structural schematic diagram of the unfolded frame structure of a foldable stroller according to this utility model.

[0032] Figure 3 This utility model relates to a frame structure for a foldable stroller. Figure 2 A schematic diagram of the structure in the front view;

[0033] Figure 4 This utility model relates to a frame structure for a foldable stroller. Figure 2 A schematic diagram of the structure from the middle side view;

[0034] Figure 5 This utility model relates to a frame structure for a foldable stroller. Figure 4 A schematic diagram of the mid-section structure;

[0035] Figure 6 This is a three-dimensional structural diagram of the frame structure of a foldable stroller according to this utility model during the folding process;

[0036] Figure 7 This utility model relates to a frame structure for a foldable stroller. Figure 6 A schematic diagram of the structure in the front view;

[0037] Figure 8 This is a three-dimensional structural diagram of the frame structure of a foldable stroller according to the present invention in its folded state;

[0038] Figure 9 This utility model relates to a frame structure for a foldable stroller. Figure 1 A magnified structural diagram of part A in the middle;

[0039] Figure 10 This is a schematic diagram of the structure of the frame locking block of a foldable stroller of this utility model, which cooperates with the first adapter sleeve.

[0040] Figure 11 This is a schematic diagram of the cross-sectional structure of the locking structure of the frame of a foldable stroller according to this utility model.

[0041] Figure 12 This utility model relates to a frame structure for a foldable stroller. Figure 1 A magnified structural diagram of section B in the middle;

[0042] Figure 13 This utility model relates to a frame structure for a foldable stroller. Figure 2 A magnified structural diagram of section C in the middle;

[0043] Figure 14 This is a schematic diagram of the brake lever and star wheel structure in the frame structure of a foldable stroller according to this utility model.

[0044] The reference numerals in the figure are as follows: 1. Front leg; 2. Rear leg; 3. Connecting part; 4. Rear link; 5. Backrest link; 6. Front link; 7. Armrest link; 8. First adapter sleeve; 9. Second adapter sleeve; 10. Locking block; 11. Switch; 12. Foot pedal structure; 13. Star wheel structure; 14. Lever; 15. Seat structure; 16. Handle; 17. Partition frame structure. Detailed Implementation

[0045] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0046] Please see Figure 1-14 This utility model relates to a frame structure for a foldable stroller. The frame structure can be changed from an unfolded state to a folded state and includes front legs 1, rear legs 2, connecting parts 3, rear connecting rods 4, backrest rods 5, front connecting rods 6, armrests 7, and a locking structure. The front connecting rods 6 and rear connecting rods 4 are hinged at both ends to the armrests 7, front legs 1, and rear legs 2, respectively, allowing the frame structure to fold from an unfolded state to a folded state.

[0047] Please see Figure 1-14In one embodiment of this utility model, a first transition position is provided between the upper and lower ends of the rear leg 2; the connecting part 3 is fixedly disposed at the upper end of the rear leg 2, and the upper end of the front leg 1 is hinged to the connecting part 3; the lower end of the rear connecting rod 4 is hinged to the rear leg 2 at the first transition position; the lower end of the backrest rod 5 is hinged to the upper end of the rear connecting rod 4, and the backrest rod 5 has a second transition position; the lower end of the front connecting rod 6 is hinged to the connecting part 3, and the upper end of the front connecting rod 6 is hinged to the backrest rod 5 at the second transition position; the lower end of the armrest rod 7 is hinged to the middle part of the rear connecting rod 4, and the armrest rod 7 is provided with a third transition position, and the armrest rod 7 is hinged to the front connecting rod 6 at the third transition position; the locking structure is used to lock and unlock the hinge between the upper end of the rear connecting rod 4 and the lower end of the backrest rod 5.

[0048] Please see Figure 1-14 In one embodiment of this utility model, in the use state, the hinge between the upper end of the rear link 4 and the lower end of the backrest rod 5 is locked by a locking structure, so that the frame structure is in the unfolded state. When it needs to be folded for storage, the hinge between the upper end of the rear link 4 and the lower end of the backrest rod 5 is unlocked by the locking structure; during the process of the frame structure changing from the unfolded state to the folded state, the lower ends of the front leg 1 and the lower ends of the rear leg 2 move towards each other, so that the lower ends of the front leg 1 and the lower ends of the rear leg 2 come closer to each other. At this time, the front wheel assembly of the front leg 1 and the rear wheel assembly of the rear leg 2 come together to contact each other or nearly contact each other; the upper end of the front link 6 and the rear... The upper end of the connecting rod 4 moves toward the lower end of the rear leg 2, thereby bringing the upper ends of the front connecting rod 6 and the rear connecting rod 4 closer to the lower end of the rear leg 2. Finally, the front connecting rod 6, the rear connecting rod 4, and the rear leg 2 come together until they are in contact or nearly in contact with each other. The upper end of the backrest rod 5 moves toward the upper end of the rear leg 2, thereby bringing the upper end of the backrest rod 5 closer to the upper end of the rear leg 2. Finally, the backrest rod 5 and the front connecting rod 6 come together until they are in contact or nearly in contact with each other.

[0049] Please see Figure 1-14 In one embodiment of this invention, the lengths of the rear leg, front link 6, rear link 4, and backrest link 5 are approximately equal to achieve an optimal volume after folding. This length limitation ensures that the folded stroller is approximately one-third the length of its unfolded state, significantly reducing its overall length. The length of the front leg 1 is less than the length of the rear leg 2, and the distance between the two front wheels is less than the distance between the two rear wheels. Thus, after folding, the two front wheels are positioned between the two rear legs 2, effectively reducing the overall frame volume in the folded state.

[0050] Please see Figure 1-11 In one embodiment of this utility model, the locking structure can be a pin structure, a screw structure, or other related structures. The pin can be located inside the hollow handrail 7 and connected to a switch 11 located at the top of the handrail 7 via a traction rope. When needed, the switch 11 can be pressed, and the pin can be pulled out by the traction rope, thereby releasing the locking of the hinge between the upper end of the rear connecting rod 4 and the lower end of the backrest rod 5. Simultaneously, an elastic element can be provided on the pin for its reset. As another example, a linear motor can be used to drive the pin to move and insert / remove from the pivot point where the upper end of the rear connecting rod 4 and the lower end of the backrest rod 5 are hinged, thereby controlling the locking and unlocking of the hinge between the upper end of the rear connecting rod 4 and the lower end of the backrest rod 5. The switch 11 located at the top of the handrail 7 can be used to control the start and stop of the linear motor.

[0051] Please see Figure 1-11 In one embodiment of this utility model, the locking structure includes a first adapter sleeve 8, a second adapter sleeve 9, and a locking block 10. The first adapter sleeve 8 is fixedly disposed at the upper end of the rear connecting rod 4, and has a locking cavity matching the locking block 10. The depth of the locking cavity is greater than the thickness of the locking block 10. A return spring is disposed between the first adapter sleeve 8 and the locking block 10. An electromagnet is also disposed on the first adapter sleeve 8, and the switch 11 of the electromagnet is disposed at the top of the handrail 7. The second adapter sleeve 9 is fixedly disposed at the lower end of the handrail 7, and has a locking cavity matching the locking block 10. Under normal conditions, the locking block 10 is half in the locking cavity of the second adapter sleeve 9 and half in the locking cavity of the first adapter sleeve 8 under the elastic force of the return spring, thereby locking the rotational freedom of the two adapter sleeves. When needed, the electromagnet is activated by the switch 11 to make it magnetic, and then the locking block 10 is attracted to overcome the elastic force of the return spring and disengage from the second adapter sleeve 9. Figure 11 (When the locking block 10 moves to the left), at this time, the rotational freedom between the first adapter sleeve 8 and the second adapter sleeve 9 is locked and unlocked, and the two can rotate relative to each other.

[0052] Please see Figure 1-12In one embodiment of this utility model, a first support rod can be fixedly provided between the two front legs 1 to strengthen the position of the two front legs 1. A foot pedal structure 12 is fixedly provided on the first support rod for supporting the baby's feet in use. A front wheel is provided at the lower end of each front leg 1. The front wheel can be a swivel wheel or a directional wheel. As an example, the front wheel is a swivel wheel. Specifically, a wheel seat is provided at the lower end of each front leg 1, and the front wheel includes a wheel head, which is coaxially rotatably engaged with the wheel seat. Further, a lever can be provided on the wheel seat, which can move linearly in the direction of approaching / moving away from the wheel head. Further, a locking hole is provided on the wheel head, and the lever can be inserted into the locking hole to lock the direction of the front wheel.

[0053] Please see Figure 1-14 In one embodiment of this utility model, a second support rod is fixedly arranged between the two rear legs 2 to ensure the strength of the rear legs 2. A rear wheel is provided at the lower end of each rear leg 2, and the rear wheel can be a swivel wheel structure or a fixed wheel structure. As an example, in this embodiment, the rear wheel is a fixed wheel structure. Furthermore, a brake structure can be provided on the rear wheel. The brake structure is used to lock the rotational freedom of the rear wheel. It can be a pin, screw, brake pad, or other existing brake structures. As an example, such as... Figure 13 , Figure 14 The rear wheel is equipped with a star wheel structure 13, and a lever 14 is rotatably mounted on the lower end of the rear leg 2. A brake lever is fixedly mounted on the lever 14. When the rear wheel rotates, the brake lever is located outside the rotation trajectory of the star wheel structure 13, which does not affect the rotational freedom of the rear wheel. When needed, the brake lever can be moved by moving the lever 14, so that the brake lever is inside the star wheel structure 13 and locks the star wheel structure 13, thereby achieving a braking effect.

[0054] Please see Figure 1-5 In one embodiment of this utility model, a seat structure 15 is also provided. One end of the seat structure 15 is hinged to the rear connecting rod 4, and the connection point is located between the lower end of the armrest 7 and the lower end of the rear connecting rod 4. The other end of the seat structure 15 is hinged to the connecting part 3 via a connecting rod. The seat structure 15 is used to subsequently cooperate with a seat cushion and other structures for the baby to lie down or sit. Furthermore, a handle 16 can be provided below the seat structure 15, and the handle 16 is movably inserted into the seat structure 15. In this way, the handle 16 can serve as a support for the seat cushion, and after the frame is folded, the handle 16 can be used as a gripping part.

[0055] Please see Figure 1-5In one embodiment of this utility model, a shielding frame structure 17 is further provided, which is hinged to the rear connecting rod 4 at the second transition position. In use, a drape or shielding layer can be provided on the shielding frame structure 17, and the position of the shielding layer can be adjusted by the shielding frame structure 17.

[0056] The working principle of this utility model:

[0057] This application provides a frame structure for a foldable stroller, including front legs 1, rear legs 2, connecting part 3, rear link 4, backrest bar 5, front link 6, armrest bar 7, and locking structure, etc. During the transition from the unfolded to the folded state of the frame structure, the lower ends of the front leg 1 and the rear leg 2 move towards each other, bringing them closer together. At this time, the front wheel assembly of the front leg 1 and the rear wheel assembly of the rear leg 2 come together until they are in contact or nearly in contact. The upper ends of the front link 6 and the rear link 4 move towards the lower ends of the rear leg 2, bringing them closer together. Finally, the front link 6, the rear link 4, and the rear leg 2 come together until they are in contact or nearly in contact. The upper end of the backrest rod 5 moves towards the upper end of the rear leg 2, bringing it closer to the upper end of the rear leg 2. Finally, the backrest rod 5 and the front link 6 come together until they are in contact or nearly in contact. During the folding process, the backrest bar 5, front link 6, and rear link 4 move towards the rear leg 2 from the rear, while the front leg 1 moves towards the rear leg 2 from the front. Therefore, after releasing the locking mechanism, lifting the handlebar 7 causes the rear wheels to leave the ground while the front wheels contact the ground. The front wheels and the upper part of the handlebar 7 are in an up-down position. At this point, pressing down will fold the entire frame structure for storage. The entire folding and storage process can be completed with one hand, without needing to fold any part first or remove the handlebar 7 or related structures. This solves the problem of existing folding strollers having complex structures, inconvenient folding processes, and being difficult to operate for users holding infants.

[0058] The foregoing has provided a detailed description of one embodiment of the present invention, but the description is merely a preferred embodiment and should not be construed as limiting the scope of the present invention. All equivalent variations and improvements made within the scope of the claims of the present invention should still fall within the scope of the claims of the present invention.

[0059] In the description of this utility model, it should be noted that the terms "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use. They are used only for the convenience of describing this utility model and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0060] In the description of this utility model, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0061] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

Claims

1. A frame structure for a foldable stroller, characterized in that, include: Forelegs; The hind leg has a first transition point between its upper and lower ends; A connecting part is fixedly disposed at the upper end of the hind leg, and the upper end of the front leg is hinged to the connecting part; The rear link, the lower end of which is hinged to the rear leg at the first transition position; A backrest rod, the lower end of which is hinged to the upper end of the rear connecting rod, and the backrest rod has a second transition position; The front link has its lower end hinged to the connecting part and its upper end hinged to the backrest rod at the second transition position. A handrail, the lower end of which is hinged to the middle of the rear connecting rod, and a third transition position is provided on the handrail, at which the handrail and the front connecting rod are hinged; A locking structure is provided for locking and unlocking the hinged connection between the upper end of the rear link and the lower end of the backrest rod.

2. The frame structure of a foldable stroller according to claim 1, characterized in that, A first support rod is fixedly installed between the two front legs, and a foot pedal structure is fixedly installed on the first support rod.

3. The frame structure of a foldable stroller according to claim 2, characterized in that, The lower end of the front leg is provided with a front wheel, which is a swivel wheel structure.

4. The frame structure of a foldable stroller according to claim 3, characterized in that, A second support rod is fixed between the two hind legs.

5. The frame structure of a foldable stroller according to claim 4, characterized in that, The lower end of the rear leg is provided with a rear wheel, which is a swivel wheel structure or a fixed wheel structure.

6. The frame structure of a foldable stroller according to claim 5, characterized in that, The rear wheel is equipped with a braking structure.

7. The frame structure of a foldable stroller according to claim 6, characterized in that, The length of the front leg is smaller than the length of the hind leg.

8. The frame structure of a foldable stroller according to claim 7, characterized in that, The distance between the two front wheels is less than the distance between the two rear wheels.

9. The frame structure of a foldable stroller according to claim 1, characterized in that, It also includes a seat structure, one end of which is hinged to the rear link, with the connection point located between the lower end of the armrest and the lower end of the rear link. The other end of the seat structure is hinged to the connecting part via a link.

10. The frame structure of a foldable stroller according to claim 1, characterized in that, It is also provided with a shielding frame structure, which is hinged to the rear connecting rod at the second transition position.

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