Brake structure for baby stroller

Abstract

According to the technical scheme, when a brake treading part rotates under the action of external force and drives a brake mechanism to brake or unlock a wheel set, the brake treading part can automatically conduct reset lifting actions, specifically, the brake treading part integrates the locking function and the unlocking function into a whole, and the brake structure has the advantages of being convenient to use, safe and reliable. And when the brake treading part performs treading action at the initial position to achieve brake braking, the brake treading part returns to the initial position, the brake treading part is treaded again, brake braking is unlocked, and the brake treading part returns to the initial position again. The technical effect of brake single-point control is achieved, daily use is facilitated, in conclusion, operation areas do not need to be distinguished through single-point interaction during braking or unlocking, brake interaction is simple, and the beneficial technical effect of convenient operation is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of infant and child products, and in particular to a brake structure for a baby stroller. Background Art

[0002] Strollers are essential for daily travel for infants and young children, so the safety and convenience of their braking systems are always a core concern for users. Most mainstream strollers on the market currently use mechanical brake pedals, which lock or unlock the wheels by stepping on them. However, traditional braking systems generally have problems such as redundant operation and inconvenient resetting. During daily use of strollers, when users operate the brakes in wet or muddy environments, they still need to use the upper of their shoes to lift the pedal to release the brakes, which can cause stains on the uppers and even operational errors. With the increasing demand for one-handed operation and contactless interaction, there is an urgent need for technical solutions that can automatically switch between braking and unlocking with a single action.

[0003] Existing technology, represented by CN114802406A, proposes a solution for achieving simultaneous braking and unlocking of both wheels through a linkage mechanism. Its specific technical features are that the first and second braking mechanisms are connected by a traction member. Stepping on one pedal locks both wheels, while stepping on the other pedal unlocks them. The locking and unlocking operations follow the same direction, eliminating the need for reverse pedaling required in traditional technology. However, while this technology partially solves the problem of the shoe upper contacting the pedals, it still suffers from a fragmented operational logic. In actual use, locking and unlocking actions must be performed separately (on both pedals). Users need to memorize the operating areas, which can easily lead to misoperation in emergency situations.

[0004] In summary, the existing technology has the defects of complex brake interaction and the need to distinguish the operating areas. When using it, users need to distinguish the pedal positions for locking and unlocking. The operating process does not conform to the human-computer interaction trend of single-point control. Summary of the Invention

[0005] The main purpose of the present invention is to propose a brake structure for a baby stroller, aiming to solve the technical problem of the existing technology that the brake interaction is complex and the operating area needs to be distinguished.

[0006] To achieve the above-mentioned object, the present invention provides a brake structure for a baby stroller, comprising:

[0007] Wheel set;

[0008] The brake pedal portion includes a first rotating seat and a pedal. The pedal is arranged on the side of the first rotating seat. When the pedal is subjected to an external force, the first rotating seat rotates with the pedal relative to the wheel set, and the brake pedal portion is rotatably arranged relative to the wheel set.

[0009] The brake mechanism includes a second rotating seat and a brake pin. The second rotating seat is rotatably arranged relative to the wheel set. The brake pin is movably arranged between the second rotating seat and the wheel set. At the same time, the second rotating seat is at least partially in contact with the first rotating seat. Whenever the pedal is rotated by an external force, the second rotating seat is subjected to force from the contact portion and rotates along with the first rotating seat. When the wheel set is in an unlocked state, whenever the brake pedal portion is rotated by an external force, the brake mechanism locks the wheel set. Correspondingly, when the wheel set is locked, whenever the brake pedal portion is rotated by an external force, the brake mechanism releases the lock on the wheel set.

[0010] The reset mechanism automatically resets the brake pedal part after the brake pedal part is rotated by external force.

[0011] Furthermore, the reset mechanism includes a first elastic member and a fixed structure provided on the first rotating seat, and the first elastic member is at least partially mounted on the fixed structure.

[0012] Furthermore, the first elastic member is a torsion spring, the fixing structure is a disc groove body, the fixing structure includes a disc portion and a wire portion, and while the torsion spring extends into the disc portion, the end of the torsion spring extends into the wire portion to form a limit.

[0013] Furthermore, a second elastic member is provided between the brake pin and the wheel assembly for causing the brake pin to abut against the second rotating seat through elastic force.

[0014] Furthermore, the second rotating seat includes a driving high surface and a driving low surface abutting against the brake pin. When the brake pin abuts against the driving high surface, the brake pin resists the second elastic member and extends toward the wheel group to form a lock. When the brake pin abuts against the driving low surface, the brake pin is resisted by the second elastic member and disengages from the wheel group to form an unlock.

[0015] Furthermore, it also includes a fixed-point limiting mechanism, which fixes a specific rotation point of the braking mechanism. The fixed-point limiting mechanism includes a positioning tooth and a directional structure for guiding the movement of the positioning tooth. The positioning tooth moves within the range of the directional structure as the braking mechanism rotates. The positioning tooth is rotatably installed on the braking mechanism. At the same time, the positioning tooth is arranged between the braking mechanism and the wheel group, and the directional structure is arranged on the wheel group.

[0016] Furthermore, the positioning tooth includes a first positioning angle and a second positioning angle, and the directional structure includes a directional track and a first impact angle and a second impact angle arranged opposite to each other. After the positioning tooth moves with the braking mechanism, the positioning tooth moves along the directional structure, and the first positioning angle can abut against the first impact angle, and the second positioning angle can abut against the second impact angle.

[0017] Furthermore, the fixed-point limiting mechanism also includes a third elastic member for further adjusting the movement of the positioning tooth. The third elastic member is arranged between the braking mechanism and the wheel set, and the third elastic member stores elastic potential energy as the braking mechanism rotates.

[0018] Furthermore, the angle ranges of the first positioning angle and the second positioning angle are limited to right angles or obtuse angles, the angle ranges of the first impact angle and the second impact angle are limited to acute angles, and the first positioning angle and the second positioning angle can be eccentrically rotated at the first impact angle and the second impact angle respectively.

[0019] Furthermore, the wheel assembly is provided with a limiting portion for limiting the rotation angle of the first rotating seat, and a connecting member is provided between the first rotating seat and the pedal, the connecting member including a stop portion and an extension portion, wherein when the stop portion abuts against the limiting portion, the first rotating seat stops moving.

[0020] The technical solution of the present invention is that when the brake pedal is rotated by an external force and drives the brake mechanism to brake or release the wheel group, the brake pedal itself can automatically reset and lift. Specifically, the brake pedal integrates the locking and unlocking functions in one, and when the brake pedal is stepped on in the initial position and the brake is applied, the brake pedal will return to the initial position. The brake pedal is stepped on again to unlock the brake, and the brake pedal returns to the initial position again. The present invention achieves the technical effect of single-point brake control on the basis of eliminating the need for shoe contact, which is convenient for daily use. In summary, the present invention uses single-point interaction when braking or releasing the brake, without distinguishing the operating areas. The brake interaction is simple and has the beneficial technical effect of convenient operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0022] Figure 2 It is a three-dimensional structural exploded view of the present invention;

[0023] Figure 3 This is an exploded view of the brake pedal and reset mechanism;

[0024] Figure 4 Schematic diagram of the three-dimensional structure of the braking mechanism;

[0025] Figure 5 It is a three-dimensional structural exploded view of the brake mechanism;

[0026] Figure 6 Schematic diagram of the three-dimensional structure of the second rotating seat;

[0027] Figure 7 It is a schematic diagram of the three-dimensional structure of the brake pedal and the second rotating seat;

[0028] Figure 8 This is a three-dimensional structural exploded view of the wheel assembly;

[0029] Figure 9It is a schematic diagram of the planar structure of the wheel seat, the orientation structure, the third elastic member and the positioning teeth;

[0030] Figure 10 It is a schematic diagram of the planar structure when the positioning tooth is located at the first position of the orientation structure;

[0031] Figure 11 It is a schematic diagram of the planar structure in which the positioning tooth is located at the second position of the orientation structure;

[0032] Figure 12 It is a schematic diagram of the planar structure when the positioning tooth is located at the third position of the orientation structure;

[0033] Figure 13 It is a schematic diagram of the planar structure in which the positioning tooth is located at the fourth position of the orientation structure;

[0034] Figure 14 It is a schematic diagram of the planar structure in which the positioning tooth is located at the fifth position of the orientation structure;

[0035] Figure 15 It is a schematic diagram of the planar structure in which the positioning tooth is located at the sixth position of the orientation structure;

[0036] Figure 16 This is an exploded view of the three-dimensional structure of the brake pedal and wheel assembly.

[0037] The above drawings include the following reference numerals:

[0038] 1. Wheel assembly; 11. Wheel seat; 12. Wheel; 13. Limiting portion; 131. First limiting wall; 132. Second limiting wall; 14. First end plate; 15. Brake lock hole; 2. Brake pedal; 21. First rotating seat; 211. First driving portion; 22. Pedal; 23. Connecting member; 231. Stopper; 232. Extension portion; 24. Cover plate; 3. Braking mechanism; 31. Second rotating seat; 311. Driving high surface; 312. Driving low surface Surface; 313, second driving part; 314, second end plate; 315, synchronization point; 32, brake pin; 4, reset mechanism; 41, first elastic member; 42, fixed structure; 421, disk portion; 422, line portion; 5, fixed-point limiting mechanism; 51, positioning tooth; 511, first positioning angle; 512, second positioning angle; 52, orientation structure; 521, orientation track; 522, first impact angle; 523, second impact angle; 53, third elastic member. DETAILED DESCRIPTION

[0039] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0040] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, top, bottom, inside, outside, vertical, horizontal, longitudinal, counterclockwise, clockwise, circumferential, radial, axial...), then the directional indication is only used to explain the relative position relationship, movement status, etc. between the various components in a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0041] In addition, if there are descriptions involving "first" or "second" in the embodiments of the present invention, the descriptions of "first" or "second" are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between the various embodiments can be combined with each other, but this must be based on the fact that ordinary technicians in this field can implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0042] The present invention provides a brake structure for a baby stroller.

[0043] In the embodiment of the present invention, Figures 1 to 16As shown, the brake structure for the baby stroller includes a wheel set 1 and a brake pedal 2 rotatably arranged relative to the wheel set 1, and a brake mechanism 3 arranged between the wheel set 1 and the brake pedal 2. The brake pedal 2 includes a first rotating seat 21 and a pedal 22. The pedal 22 is arranged on the side of the first rotating seat 21. After the pedal 22 is subjected to an external force, the first rotating seat 21 rotates relative to the wheel set 1 along with the pedal 22. The brake mechanism 3 includes a second rotating seat 31 and a brake pin 32. The second rotating seat 31 is rotatably arranged relative to the wheel set 1. The brake pin 32 is movably arranged between the second rotating seat 31 and the wheel set 1. At the same time, the second rotating seat 31 is at least partially in contact with the first rotating seat 21. Whenever the pedal 22 is rotated by an external force, the second rotating seat 31 moves from the contact The contact part is subjected to force and rotates along with the first rotating seat 21. When the wheel group 1 is in the unlocked state, whenever the brake pedal part 2 is rotated by external force, the brake mechanism 3 locks the wheel group 1. Correspondingly, when the wheel group 1 is locked, whenever the brake pedal part 2 is rotated by external force, the brake mechanism 3 releases the lock of the wheel group 1. In addition, it also includes a reset mechanism 4. After the brake pedal part 2 is rotated by external force, the reset mechanism 4 automatically resets the brake pedal part 2. While the present invention completes the braking or unlocking process of the wheel group 1 by operating the brake pedal part 2, it can automatically reset the brake pedal part 2 to form a single reciprocating cycle operation. The operation cycle logic of the present invention is simple and the interaction is intuitive. When braking or releasing is required, just step on the brake pedal part 2.

[0044] It should be noted in advance that the aforementioned brake pedal portion 2 is the portion where the external force is applied. As a general example of use, a functional portion for rotation and a functional portion for pedaling force, namely the first rotating seat 21 and the pedal 22, are often required. In fact, the functional portion for pedaling force is not an essential component. Therefore, in some embodiments, the brake pedal portion 2 only refers to the functional portion for pedaling force, which is embodied as the first rotating seat 21. In addition, the aforementioned first rotating seat 21 and the second rotating seat 31 can cooperate in rotation. Considering the cost, the preferred specific structure is formed based on the mechanical structure. The first driving portion 211 can be provided on the first rotating seat 21, corresponding to A second driving part 313 is provided on the second rotating seat 31. When the first rotating seat 21 rotates so that the first driving part 211 abuts against the second driving part 313 of the second rotating seat 31, the first rotating seat 21 drives the second rotating seat 31 to rotate. The first driving part 211 and the second driving part 313 are respectively provided on the sides of the first rotating seat 21 and the second rotating seat 31, and preferably, the first driving part 211 and the second driving part 313 rotate in cooperation in the form of face-to-face abutment. When the plane of the first driving part 211 contacts the plane of the second driving part 313, the first driving part 211 starts to drive the second driving part 313 to rotate.

[0045] In some embodiments of the present invention, the reset mechanism 4 includes a first elastic member 41 and a fixed structure 42 provided on the first rotating seat 21. The first elastic member 41 is at least partially installed on the fixed structure 42. In this embodiment, the first rotating seat 21 performs a reset action by means of the elastic potential energy released by the first elastic member 41. The function of the fixed structure 42 is to accommodate the first elastic member 41 and limit the elastic distance of the first elastic member 41. In addition, the first rotating seat 21 is cooperated with a cover plate 24, which is used to limit the first elastic member 41 to the fixed structure 42 and prevent it from falling out.

[0046] Specifically, the first elastic member 41 is a torsion spring, the fixing structure 42 is a disc trough body, and the fixing structure 42 includes a disc portion 421 and a wire portion 422. When the torsion spring extends into the disc portion 421, the end of the torsion spring extends into the wire portion 422 to form a limit. It can be understood that the function of the disc portion 421 is to accommodate the first elastic member 41 and limit its elastic distance, while the wire portion 422 fixes the end of the torsion spring. In some other embodiments of the present invention, the torsion spring can be equivalently replaced by an elastic deformable component such as a leaf spring, a rubber body, or a silicone body. What is an elastic deformable component? This is the prior art part and will not be elaborated on in detail. It is also worth noting that, in fact, the function of the reset mechanism 4 is the rotation effect. When the brake pedal part 2 rotates, the reset mechanism 4 can make the brake pedal part 2 rotate. In addition to the rebound effect, the rotation effect can also be achieved through mechanical structure or electromagnetic effect, such as using counterweight blocks, rack springs, electromagnets and other components. In actual production activities, the above components can be used to adaptively modify the present invention to obtain a reset mechanism 4 that achieves return through mechanical structure or electromagnetic effect.

[0047] In some embodiments of the present invention, a second elastic member (not shown) is provided between the brake pin 32 and the wheel assembly 1 for causing the brake pin 32 to abut against the second rotating seat 31 through elastic force. Under the influence of the second elastic member, the brake pin 32 will not extend toward the wheel assembly 1 before being driven by the second rotating seat 31.

[0048] Specifically, the second elastic member is a spring. Before the brake pin 32 is driven by the second rotating seat 31, the spring is in a normal telescopic state, and extends toward the wheel group 1 through its own elasticity to resist the brake pin 32. After the brake pin 32 is driven by the second rotating seat 31, the spring is in a compressed state, and the brake pin 32 extends into the wheel group 1 against the elasticity of the spring to achieve braking. In some other embodiments of the present invention, the second elastic member can also be equivalently replaced by common elastic components such as rubber, sponge, and elastic fiber. This is existing technology and will not be elaborated on.

[0049] When the cam 32 is in the unlock state, the second stop 311 and the second stop 312 are in the unlock state, so that the cam 32 can be unlocked after the cam 32 is unlocked.

[0050] In some embodiments of the present invention, a fixed-point limiting mechanism 5 is further included, which fixes a specific rotation point of the braking mechanism 3. The fixed-point limiting mechanism 5 includes a positioning tooth 51 and a directional structure 52 for guiding the movement of the positioning tooth 51. The positioning tooth 51 moves within the range of the directional structure 52 as the braking mechanism 3 rotates. The positioning tooth 51 is rotatably mounted on the braking mechanism 3. At the same time, the positioning tooth 51 is arranged between the braking mechanism 3 and the wheel group 1, and the directional structure 52 is arranged on the wheel group 1.

[0051] Specifically, the positioning tooth 51 includes a first positioning angle 511 and a second positioning angle 512, and the orientation structure 52 includes an orientation track 521 and a first impact angle 522 and a second impact angle 523 set opposite to each other. After the positioning tooth 51 moves with the braking mechanism 3, the positioning tooth 51 moves along the orientation structure 52, and the first positioning angle 511 can abut against the first impact angle 522, and the second positioning angle 512 can abut against the second impact angle 523.

[0052] Specifically, the fixed-point limiting mechanism 5 also includes a third elastic member 53 for further adjusting the activity of the positioning tooth 51. The third elastic member 53 is arranged between the braking mechanism 3 and the wheel group 1, and the third elastic member 53 stores elastic potential energy as the braking mechanism 3 rotates. The specific adjustment of the positioning tooth 51 by the third elastic member 53 is described as follows: when the first positioning angle 511 of the positioning tooth 51 collides with the first impact angle 522, the second rotating seat 31 is rotated by the third elastic member 53, and the positioning tooth 51 moves with the second rotating seat 31, so that the second positioning angle 512 abuts against the second impact angle 523. At this time, the aforementioned driving high surface 311 abuts against the brake pin 32, and the wheel group 1 forms a brake. The working principle of this part will be elaborated in detail later. Here, only the specific role of the third elastic member 53 is pointed out.

[0053] More specifically, the third elastic member 53 is a spring, and the wheel set 1 and the second rotating seat 31 are respectively provided with a first end plate 14 and a second end plate 314 for placing the two ends of the spring. After the second rotating seat 31 rotates, the spring is compressed to store elastic potential energy. After the rotation stops, the spring releases the elastic potential energy to make the second rotating seat 31 rotate, thereby affecting the movement of the positioning tooth 51. In some other embodiments of the present invention, the third elastic member 53 can also be equivalently replaced by common elastic components such as rubber, sponge, and elastic fiber. This is a prior art and will not be elaborated on.

[0054] Specifically, the angle range of the first positioning angle 511 and the second positioning angle 512 is limited to a right angle or an obtuse angle, and the angle range of the first impact angle 522 and the second impact angle 523 is limited to an acute angle. At the same time, the first positioning angle 511 and the second positioning angle 512 can be eccentrically rotated on the first impact angle 522 and the second impact angle 523 respectively. It can be understood that the angle of the first positioning angle 511 and the second positioning angle 512 is limited so that the angle formed by the two sides is greater than the first impact angle 522 and the second impact angle 523. When the movement produces abutment, the first positioning angle 511 or the second positioning angle 512 can be effectively limited at the first impact angle 522 or the second impact angle 523 through eccentric rotation, which is conducive to maintaining the stability of the positioning tooth 51 during the point movement process.

[0055] In some embodiments of the present invention, the wheel assembly 1 includes a wheel seat 11, a wheel 12, and a brake lock hole portion 15. The aforementioned first rotating seat 21, second rotating seat 31, and positioning tooth 51 are all movably connected to the wheel seat 11. The third elastic member 53 is disposed in the wheel seat 11, and the brake pin 32 extends into the brake lock hole portion 15 to brake the wheel assembly 1. This is a conventional configuration of the wheel assembly 1 for a stroller. This paragraph serves as a statement of the prior art and is explained in conjunction with the aforementioned content.

[0056] Specifically, the wheel group 1 is provided with a limiting portion 13 for limiting the rotation angle of the first rotating seat 21, and a connecting member 23 is provided between the first rotating seat 21 and the pedal 22, and the connecting member 23 includes a stop portion 231 and an extension portion 232, wherein, when the stop portion 231 abuts against the limiting portion 13, the first rotating seat 21 stops moving, more specifically, the limiting portion 13 includes a first limiting wall 131 and a second limiting wall 132, when the stop portion 231 hits the first limiting wall 131 or the second limiting wall 132, the first rotating seat 21 stops moving, and the first rotating seat 21 is restricted to rotate within a fixed angle range of the limiting portion 13, so as to better realize the cyclic reciprocating operation of the present invention.

[0057] In some embodiments of the present invention, in order to achieve synchronous braking and unlocking on both sides of the baby stroller, synchronization points 315 can be set on the second rotating bases 31 on both sides, and connecting lines (not shown) can be installed at the synchronization points 315 to synchronize the movements of the two sides. When the second rotating base 31 rotates, the second rotating base 31 on the other side rotates synchronously.

[0058] The following content serves as an explanation of the working principle of the present invention:

[0059] When the pedal 22 is pressed down by an external force (such as stepping on it with your foot or being touched by an object), the first rotating seat 21 will rotate, and the second driving portion 313 will be driven by the first driving portion 211, and the second rotating seat 31 will rotate accordingly. The positioning tooth 51 starts from the starting point of the directional track 521 and moves to the first impact angle 522. The brake pin 32 rotates from the state of contacting the driving lower surface 312 to the driving high surface 311, so that the brake pin 32 extends into the brake lock hole 15 to form a brake. At this time, the corresponding working content of the present invention is as follows: the first rotating seat 21 is reset due to the action of the first elastic member 41, the pedal 22 returns to its original position, and the second rotating seat 31 starts to rotate due to the action of the third elastic member 53. During the rotation process, the positioning tooth 51 moves from the first impact angle 522 to the second impact angle 523 and then stops. Since the positioning tooth 51 is stuck at the second impact angle 523, the second rotating seat 31 remains stationary, and at this time the brake pin 32 is located in the part of the driving high surface 311, and the present invention remains locked. When the pedal 22 is pressed down by external force again, the first rotating seat 21 rotates again. The first driving portion 211 drives the second driving portion 313, and the second rotating seat 31 rotates accordingly. The positioning tooth 51 moves from the second impact angle 523 to the first impact angle 522, and the brake pin 32 transitions from the state of abutting the driving high surface 311 to the driving low surface 312 through rotation, so that the brake pin 32 disengages from the brake lock hole portion 15 to release the lock. At this time, the corresponding working content of the present invention is as follows: the first rotating seat 21 is reset due to the action of the first elastic member 41, and the pedal 22 returns to its original position, while the second rotating seat 31 is reset due to the action of the third elastic member 41. The action of the third elastic member 53 starts to rotate. During the rotation, the positioning tooth 51 rotates around the second rotating seat 31 and moves from the position of the first impact angle 522 to the second impact angle 523, forming a rotation at the second impact angle 523. At this time, the positioning tooth 51 and the second impact angle 523 are no longer in a clamping state. As the third elastic member 53 rebounds, the positioning tooth 51 returns to the starting position along the directional track 521, and at this time the brake pin 32 is located in the part of the driving low surface 312. The present invention is in a released state, and a cycle action of the present invention is completed at this time.

[0060] In addition, for ease of understanding, use Figures 10 to 15The main fixed-point states of the positioning tooth 51 are recorded for reference. Please refer to the accompanying drawings to understand the above. At the end of a cycle, the positioning tooth 51 returns to the first position from the sixth position.

[0061] The above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made by using the contents of the present invention description and drawings under the inventive concept of the present invention, or direct / indirect application in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A brake structure for a baby stroller, characterized in that: include: Wheel set; The brake pedal portion includes a first rotating seat and a pedal. The pedal is arranged on the side of the first rotating seat. When the pedal is subjected to an external force, the first rotating seat rotates with the pedal relative to the wheel set, and the brake pedal portion is rotatably arranged relative to the wheel set. The brake mechanism includes a second rotating seat and a brake pin. The second rotating seat is rotatably arranged relative to the wheel set. The brake pin is movably arranged between the second rotating seat and the wheel set. At the same time, the second rotating seat is at least partially in contact with the first rotating seat. Whenever the pedal is rotated by an external force, the second rotating seat is subjected to force from the contact portion and rotates along with the first rotating seat. When the wheel set is in an unlocked state, whenever the brake pedal portion is rotated by an external force, the brake mechanism locks the wheel set. Correspondingly, when the wheel set is locked, whenever the brake pedal portion is rotated by an external force, the brake mechanism releases the lock on the wheel set. The reset mechanism automatically resets the brake pedal part after the brake pedal part is rotated by external force.

2. The brake structure according to claim 1, wherein: The reset mechanism includes a first elastic member and a fixed structure provided on the first rotating seat, and the first elastic member is at least partially installed on the fixed structure.

3. The brake structure according to claim 2, wherein: The first elastic member is a torsion spring, the fixing structure is a disc groove body, the fixing structure includes a disc portion and a wire portion, and when the torsion spring extends into the disc portion, the end of the torsion spring extends into the wire portion to form a limit.

4. The brake structure according to claim 1, wherein: A second elastic member is provided between the brake pin and the wheel assembly and is used to bring the brake pin into contact with the second rotating seat through elastic force.

5. The brake structure according to claim 4, wherein: The second rotating seat includes a driving high surface and a driving low surface abutting against the brake pin. When the brake pin abuts against the driving high surface, the brake pin resists the second elastic member and extends toward the wheel group to form a lock. When the brake pin abuts against the driving low surface, the brake pin is resisted by the second elastic member and disengages from the wheel group to form an unlock.

6. The brake structure according to claim 1, wherein: It also includes a fixed-point limiting mechanism, which fixes a specific rotation point of the braking mechanism. The fixed-point limiting mechanism includes a positioning tooth and a directional structure for guiding the movement of the positioning tooth. The positioning tooth moves within the range of the directional structure as the braking mechanism rotates. The positioning tooth is rotatably installed on the braking mechanism. At the same time, the positioning tooth is arranged between the braking mechanism and the wheel group, and the directional structure is arranged on the wheel group.

7. The brake structure according to claim 6, wherein: The positioning tooth includes a first positioning angle and a second positioning angle, and the directional structure includes a directional track and a first impact angle and a second impact angle set opposite to each other. After the positioning tooth moves with the braking mechanism, the positioning tooth moves along the directional structure, and the first positioning angle can abut against the first impact angle, and the second positioning angle can abut against the second impact angle.

8. The brake structure according to claim 7, wherein: The fixed-point limiting mechanism also includes a third elastic member for further adjusting the movement of the positioning tooth. The third elastic member is arranged between the braking mechanism and the wheel set, and the third elastic member stores elastic potential energy as the braking mechanism rotates.

9. The brake structure according to claim 7, wherein: The angle ranges of the first positioning angle and the second positioning angle are limited to right angles or obtuse angles, the angle ranges of the first impact angle and the second impact angle are limited to acute angles, and the first positioning angle and the second positioning angle can be eccentrically rotated at the first impact angle and the second impact angle respectively.

10. The brake structure according to any one of claims 1 to 9, characterized in that: The wheel assembly is provided with a limiting portion for limiting the rotation angle of the first rotating seat. A connecting piece is provided between the first rotating seat and the pedal. The connecting piece includes a stop portion and an extension portion. When the stop portion abuts the limiting portion, the first rotating seat stops moving.

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