A stroller folding mechanism

Abstract

The application discloses a stroller folding mechanism, which comprises a base pipe, a front window pipe, a rotating shoulder, a folding pipe, a folding plate assembly and a buckling assembly. The front window pipe is rotationally connected with the base pipe. The rotating shoulder is hingedly connected with the front window pipe. The folding pipe is hingedly connected with the base pipe through the folding plate assembly. The folding pipe is connected with the base pipe. The folding plate assembly is connected with the rotating shoulder. The buckling assembly is connected on the folding pipe. The buckling assembly is used for cooperating with the rotating shoulder to lock the unfolded state between the base pipe and the front window pipe. Through the pulling and folding between the base pipe and the front window pipe, the overturning of the rotating shoulder and the relative movement between the buckling assembly and the buckling connecting member, the stroller folding and unfolding state conversion can be conveniently and quickly completed.

Description

Technical Field

[0001] This invention relates to the field of stroller technology, and more specifically, to a stroller folding mechanism. Background Technology

[0002] Currently, the market offers a variety of stroller styles, each with unique structures and varying prices. While most existing strollers feature folding capabilities, the folding methods differ due to structural variations. Some strollers are designed for easy folding, while others, prioritizing other performance aspects, are less foldable. Utility model CN205034157U discloses a stroller folding mechanism. This mechanism boasts a reasonable design, simple structure, and low manufacturing cost. It allows for one-handed folding, significantly simplifying use and demonstrating strong practicality, making it suitable for widespread adoption. However, strollers utilizing this mechanism have fewer large components, making folding relatively easy. For strollers with numerous large components and a focus on load-bearing capacity, this technical solution is not applicable. Summary of the Invention

[0003] Existing stroller folding mechanisms are mostly suitable for strollers with fewer large components, but not for strollers with more large components and a focus on load-bearing capacity. To overcome this deficiency, this invention provides a stroller folding mechanism that allows strollers with more large components and a focus on load-bearing capacity to be folded easily.

[0004] The technical solution of this invention is: a folding mechanism for a stroller, comprising a base tube, a front window tube, a rotating shoulder, a folding tube, a folding plate assembly, and a fastening assembly. The front window tube is rotatably connected to the base tube, the rotating shoulder is hinged to the front window tube, the folding tube is hinged to the base tube via the folding plate assembly, the folding tube is connected to the base tube, the folding plate assembly is connected to the rotating shoulder, and the fastening assembly is connected to the folding tube. The fastening assembly is used to cooperate with the rotating shoulder to lock the unfolded state between the base tube and the front window tube. The stroller to which this invention is applicable uses large-sized components such as the base tube and the front window tube, with the base tube being the main load-bearing component and having a large load-bearing capacity. This type of stroller has a different configuration from ordinary light-load strollers, and it is not easy to achieve folding using existing stroller folding mechanisms. When using this invention, if the stroller needs to be unfolded, the front window tube is rotated relative to the base tube to fully separate them. Then, the folding plate assembly and rotating shoulder are adjusted accordingly to adapt to the change in the distance between the base tube and the front window tube. Finally, the relative positions of the base tube and the front window tube are locked by the fastening assembly, so that the base tube, the front window tube, and the rotating shoulder form a stable frame structure, thereby ensuring the normal use of the stroller. If the stroller needs to be folded up, first release the engagement between the fastening assembly and the rotating shoulder, then flip and fold the folding plate assembly and the rotating shoulder to remove the obstruction to the movement of the base tube and the front window tube, so that the base tube and the front window tube have sufficient freedom of movement. Finally, the base tube and the front window tube are rotated in the opposite direction to fold up, completing the folding of the stroller's main body, greatly reducing the space occupied by the stroller and making it convenient to carry or store.

[0005] Preferably, the fastening assembly includes a sliding sleeve and an elastic fastener. The sliding sleeve is slidably fitted onto the folding tube, and the elastic fastener is hinged to the outside of the sliding sleeve. A fastening connector that can engage with the elastic fastener is provided on the rotating shoulder. The sliding sleeve can carry the elastic fastener to slide on the folding tube, moving closer to or away from the rotating shoulder. When the stroller is unfolded, the elastic fastener moves closer to the rotating shoulder with the sliding sleeve and engages with the fastening connector, connecting the folding tube to the rotating shoulder, thereby forming the frame composed of the base tube, front window tube, and rotating shoulder. When the stroller is folded, the elastic fastener disengages from the fastening connector and moves away from the rotating shoulder with the sliding sleeve, restoring the rotation shoulder's freedom of movement.

[0006] Preferably, the end of the elastic clip is hook-shaped, and the outer edge of the end is provided with a guide slope. The fastening connector of the rotating shoulder is a locking pin, which is located next to the hinge of the rotating shoulder and the front window tube. When the elastic clip and the fastening connector are engaged, the fastening assembly and the fastening connector only need to be brought close to each other. The lateral force generated when the fastening assembly hits the guide slope can form a rotational torque relative to the hinge point of the elastic clip, thereby driving the elastic clip to flip, making way for the fastening connector to advance, so that the fastening connector can penetrate into the hook-shaped opening of the elastic clip. When the fastening connector passes the highest point of the hook-shaped structure of the elastic clip, the fastening connector and the hook-shaped structure of the elastic clip disengage, the repulsive force between the fastening connector and the elastic clip disappears, and the elastic clip elastically resets. The fastening connector falls into the hook-shaped opening of the elastic clip as a whole. The hook-shaped opening can prevent the fastening connector from exiting, thereby realizing the locking between the folding tube and the rotating shoulder, and even between the base tube and the front window tube. Therefore, this structural design facilitates the quick and easy engagement of the elastic fasteners and the fastening connectors.

[0007] Preferably, the folding plate assembly includes folding plate A, folding plate B, and folding plate C. One end of folding plate A is fixed to the folding tube, and the other end is hinged to the base tube. One end of folding plate B is hinged to folding plate A, and the other end of folding plate B is hinged to one end of folding plate C. The other end of folding plate C is fixed to the rotating shoulder. Folding plates A, B, and C in the folding plate assembly form a three-bar linkage, which can form many positional combinations and generate many degrees of adjustment freedom, facilitating convenient switching between the folding and unfolding states of this stroller's folding mechanism.

[0008] Preferably, the front window tube is U-shaped, with symmetrical rotating shoulders at both ends, connected by a crossbar. The symmetrical arrangement of the rotating shoulders facilitates the mechanical balance of the stroller's folding mechanism, and the crossbar connection improves the synchronization of the rotating shoulder movement when the stroller's folding mechanism switches between folding and unfolding states.

[0009] Preferably, a U-shaped push handle is connected to the folding tube, with both ends of the push handle inserted into the folding tube. When the stroller is in the unfolded state, the U-shaped push handle is an extension of the base tube, providing more points of force application and making it easier to push the stroller.

[0010] Preferably, the folding tube has multiple elastic pin holes on its wall, and the two ends of the push handle have elastic pins that can be inserted into these holes. This technical solution allows the push handle to be extended and retracted within the folding tube. By cooperating with different elastic pin holes, different extension lengths of the push handle can be obtained, better adapting to users of different heights and strengths, and providing a better user experience.

[0011] Preferably, the base tube has a tube seat at its front end, which is fixed to the base tube, and the front window tube is rotatably connected to the tube seat. The tube seat allows for easy hinge connection between the base tube and the front window tube.

[0012] The beneficial effects of this invention are:

[0013] The folding and unfolding operation is convenient. This invention allows for easy and quick conversion between the folding and unfolding states of the stroller through the opening and closing of the base tube and the front window tube, the flipping of the rotating shoulder, and the relative movement between the fastening assembly and the fastening connector. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of one structure of the present invention;

[0015] Figure 2 This is a schematic diagram of the folded structure of the present invention;

[0016] Figure 3 This is a schematic diagram showing the direction of the force applied when the invention changes from unfolding to folding.

[0017] Figure 4 This is a schematic diagram illustrating the state of the present invention during the folding process;

[0018] Figure 5 This is a schematic diagram showing the direction of the force applied when the invention changes from folding to unfolding;

[0019] Figure 6 This is a schematic diagram of the forces acting when the present invention is locked in the deployed state.

[0020] In the diagram, 1-base tube, 101-tube seat, 2-front window tube, 3-rotating shoulder, 301-locking pin, 302-crossbar, 4-folding tube, 401-elastic pin insertion hole, 5-folding plate assembly, 501-folding plate A, 502-folding plate B, 503-folding plate C, 504-pivot A, 505-pivot B, 6-fastening assembly, 601-sliding sleeve, 602-elastic fastener, 603-fastener cavity, 604-unlocking pin, 605-guide slope, 7-rear push handle, 701-elastic pin. Detailed Implementation

[0021] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0022] Example 1:

[0023] like Figures 1 to 5As shown, a folding mechanism for a stroller includes a base tube 1, a front window tube 2, a pair of rotating shoulders 3, a pair of folding tubes 4, a pair of folding plate assemblies 5, and a pair of fastening assemblies 6. The base tube 1 has a tube seat 101 at its front end, which is fixed to the base tube 1. The front window tube 2 is rotatably connected to the tube seat 101 via a front window tube pivot, allowing the front window tube 2 to be rotatably connected to the base tube 1 and to rotate at a certain angle. Both the base tube 1 and the front window tube 2 are U-shaped. The rotating shoulders 3 are symmetrically located at both ends of the front window tube 2, and a crossbar 302 connects the rotating shoulders 3. The folding tubes 4 are symmetrically located at both ends of the base tube 1, and a U-shaped rear push handle 7 is connected to the folding tube 4, with both ends of the rear push handle 7 inserted into the folding tube 4. Eight elastic pin holes 401 are provided on the inner wall of the folding tube 4, and elastic pins 701 at both ends of the rear push handle 7 are provided to engage with the elastic pin holes 401. The rotating shoulder 3 is hinged to the front window tube 2, and the folding tube 4 is hinged to the base tube 1 via the folding plate assembly 5. The folding tube 4 is connected to the base tube 1, and the folding plate assembly 5 is hinged to the rotating shoulder 3. The fastening assembly 6 is connected to the folding tube 4 and is used to lock the unfolded state between the base tube 1 and the front window tube 2. The fastening assembly 6 includes a sliding sleeve 601, a fastening cavity 603, and an elastic fastening piece 602. The sliding sleeve 601 is slidably sleeved on the folding tube 4. The fastening cavity 603 is located on the outside of the sliding sleeve 601. The inner end of the elastic fastening piece 602 is hinged to the fastening cavity 603. A fastening return spring is provided in the fastening cavity 603 and is connected to the elastic fastening piece 602. An unlocking pin 604 is provided at the top of the fastening cavity 603. The unlocking pin 604 can press the elastic fastening piece 602 to make the elastic fastening piece 602 flip against the elastic force of the fastening return spring. The rotating shoulder 3 is provided with a fastening connector that can cooperate with the elastic fastening piece 602. The end of the elastic fastener 602 is hook-shaped, and the outer edge of the end is provided with a guide slope 605. The rotating shoulder 3 is F-shaped. The fastening connector is a locking pin 301, which is located next to the hinge of the rotating shoulder 3 and the front window tube 2. The folding plate assembly 5 includes folding plate A501, folding plate B502 and folding plate C503. One end of folding plate A501 is fixedly connected to the inside of the folding tube 4 by two screws. The other end of folding plate A501 is hinged to the base tube 1 by a pivot A504. One end of folding plate B502 is hinged to folding plate A501 by a pivot B505. The other end of folding plate B502 is hinged to one end of folding plate C503. The other end of folding plate C503 is fixed to the rotating shoulder 3 by two screws.

[0024] When using this invention, to unfold the stroller, apply force F1 to lift the rotating shoulder 3 upwards. The rotating shoulder 3 flips around the hinge point at the end of the front window tube 2, gradually moving away from the pivot B505. This forces the folding plates A501, B502, and C503 to gradually change their relative positions until they are aligned and overlap with the folding tube 4, accommodating the change in distance between the rotating shoulder 3 and the pivot B505. As the rotating shoulder 3 flips upwards, the front window tube 2 moves along with it. Figure 5 The counterclockwise rotation shown increases the angle between the base tube 1 and the front window tube 2. During the straightening process of the folding plates A501, B502, and C503, it also forces the folding tube 4 and the rear push handle 7 to... Figure 5 The clockwise rotation shown is to accommodate the change in the relative position between the base tube 1 and the front window tube 2. When the angle between the base tube 1 and the front window tube 2 increases to the design value, push the sliding sleeve 601 towards the rotating shoulder 3 by hand. During the sliding process, since the three plates A501, B502 and C503 are aligned in a straight line and overlap with the folding tube 4, they can pass through the buckle cavity 603 without obstructing the sliding sleeve 601. After the front end of the elastic buckle 602 contacts the locking pin 301 on the rotating shoulder 3, apply a force F2 backward to make the locking pin 301 press against the guide slope 605, push the elastic buckle 602 to automatically flip, and the locking pin 301 enters the hook-shaped opening of the elastic buckle 602. The hook-shaped opening can prevent the locking pin 301 from exiting, locking the relative position of the base tube 1 and the front window tube 2, so that the base tube 1, the front window tube 2 and the rotating shoulder 3 form a stable frame structure, thereby completing the unfolding of the stroller and ensuring the normal and safe use of the stroller. To fold the stroller, first press the unlocking pin 604 to flip the elastic buckle 602, allowing the locking pin 301 to exit the channel and release the locking pin 301. Then, apply force F to push the rear push handle 7 forward, completely disengaging the fastening assembly 6 from the rotating shoulder 3, and causing the rear push handle 7 to move along the pivot A504 of the folding plate A501. Figure 4 As shown, when rotating counterclockwise, the pivot B505 of the folding plate A501 drives the folding plate B502 to move counterclockwise together, which in turn drives the rotating shoulder 3 and the front window tube 2 to move clockwise, thus completing the folding of the main body of the stroller.

[0025] Example 2:

[0026] There are seven resilient pin insertion holes 401. The rest is the same as in Example 1.

Claims

1. A folding mechanism for a stroller, characterized in that: The device includes a base tube, a front window tube, a rotating shoulder, a folding tube, a folding plate assembly, and a fastening assembly. The front window tube is rotatably connected to the base tube, the rotating shoulder is hinged to the front window tube, the folding tube is hinged to the base tube via the folding plate assembly, the folding tube is connected to the base tube, the folding plate assembly is connected to the rotating shoulder, and the fastening assembly is connected to the folding tube. The fastening assembly is used to cooperate with the rotating shoulder to lock the unfolded state between the base tube and the front window tube. The folding plate assembly includes folding plate A, folding plate B, and folding plate C. One end of folding plate A is fixed to the folding tube, and the other end is hinged to the base tube. One end of folding plate B is hinged to folding plate A, and the other end of folding plate B is hinged to one end of folding plate C. The other end of folding plate C is fixed to the rotating shoulder.

2. The stroller folding mechanism according to claim 1, characterized in that: The fastening assembly includes a sliding sleeve and an elastic fastener. The sliding sleeve is slidably fitted onto the folded tube, and the elastic fastener is hinged to the outside of the sliding sleeve. A fastening connector that can cooperate with the elastic fastener is provided on the rotating shoulder.

3. The stroller folding mechanism according to claim 2, characterized in that: The end of the elastic fastener is hook-shaped and the outer edge of the end is provided with a guide bevel. The fastening connector is a locking pin, which is located next to the hinge of the rotating shoulder and the front window tube.

4. The stroller folding mechanism according to claim 1, characterized in that the front window tube is U-shaped, rotating shoulders are symmetrically arranged at both ends of the front window tube, and a crossbar is connected between the rotating shoulders.

5. The stroller folding mechanism according to claim 1, characterized in that: A U-shaped push handle is connected to the folding tube, with both ends of the push handle inserted into the folding tube.

6. The stroller folding mechanism according to claim 5, characterized in that: The folded tube has multiple elastic pin holes on its wall, and the two ends of the push handle have elastic pins that can be inserted into the elastic pin holes.

7. The stroller folding mechanism according to any one of claims 1 to 6, characterized in that: The base tube has a tube seat at the front end, and the tube seat is fixed on the base tube. The front window tube is rotatably connected to the tube seat.

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