Brake mechanism for chair wheel

Abstract

The utility model belongs to the technical field of wheelchair brake, and particularly relates to a brake mechanism for a chair wheel, which comprises a chair base and a chair wheel main body, and a wheel sheet is arranged on the outer side of the chair wheel main body. A brake disc for achieving braking or unlocking through vertical movement is arranged below the extrusion mechanism, the brake disc is driven by the extrusion mechanism to move downwards, the extrusion mechanism comprises an upper extrusion part and a rotary pressing disc which are matched for use, and a lower extrusion part used for being matched with the upper extrusion part for use is arranged on the rotary pressing disc. The learning chair locking device is reasonable in design, simple in structure, convenient to machine, capable of effectively completing convenient locking of the position where the learning chair is located, easy and convenient to operate, high in use functionality, particularly convenient to use by different people, capable of improving practicability of the device, capable of reducing operation difficulty and fully guaranteeing use requirements and suitable for large-scale application and popularization.

Description

Technical Field

[0001] The utility model belongs to the technical field of wheelchair brakes, and in particular relates to a brake mechanism for chair wheels. Background Art

[0002] The wheels of a study chair generally have two mechanisms: fixed wheels and universal wheels to meet people's different usage needs. To put it more specifically, the wheels are usually equipped with two wheels, which can facilitate the movement of the study chair and the adjustment of the direction or posture of the study chair, thereby ensuring the comfort of sitting on the study chair.

[0003] In the prior art, the locking of the above-mentioned chair wheel is usually achieved by using the body weight to cause friction between the locking plate and the wheel plate. However, before sitting down, the user needs to move the chair to a suitable position in front of the table and then sit down. During this process, due to the limitation of the table top, the user is in a half-sitting state when adjusting the final position of the chair. For younger children, due to their weak leg strength, it is inconvenient to use. Utility Model Content

[0004] In response to the technical problems existing in the locking process of the above-mentioned study chair, the utility model proposes a brake mechanism for chair wheels which has a reasonable design, a simple structure, is easy to process and can effectively complete the convenient locking of the position of the study chair. The operation is simple and convenient, the use functionality is strong, and it is especially convenient for different groups of people to use. The practicability of the device is improved, the operation difficulty is reduced, and the use requirements are fully guaranteed.

[0005] In order to achieve the above-mentioned purpose, the technical solution adopted by the utility model is a brake mechanism for chair wheels, including a chair base and a chair wheel body, a wheel piece is arranged on the outer side of the chair wheel body, a squeezing mechanism is arranged below the chair base, a brake disc is arranged below the squeezing mechanism for braking or unlocking by moving up and down, the brake disc is driven downward by the squeezing mechanism, the squeezing mechanism includes an upper squeezing part and a rotating pressure plate used in conjunction with each other, and a lower squeezing part for cooperating with the upper squeezing part is arranged on the rotating pressure plate.

[0006] Preferably, one or both of the upper end surface of the lower extrusion portion and the lower end surface of the upper extrusion portion are configured as inclined surfaces.

[0007] Preferably, the upper extrusion portion and the lower extrusion portion are both arc-shaped structures.

[0008] Preferably, a connecting shaft is arranged above the chair wheel body, and a through hole for one end of the connecting shaft to pass through is respectively opened in the brake disc and the rotating pressure plate.

[0009] Preferably, a driving rod for driving the rotating pressure plate to rotate is provided on the outer side of the rotating pressure plate.

[0010] Preferably, the upper extrusion portion is fixedly arranged at a corner below the chair base, and the chair wheel body is connected to the chair base via a connecting shaft.

[0011] Preferably, a boss is provided at the geometric center above the brake disc, and a groove in a circular shape for accommodating the boss is provided at the bottom of the rotating pressure plate.

[0012] Preferably, the bottom of the brake disc is provided with locking teeth for cooperating with the wheel disc.

[0013] Preferably, the brake disc is provided with a lifting and resetting mechanism for driving the brake disc to rise.

[0014] Preferably, the rising and resetting mechanism includes an elastic body for driving the brake disc to separate from the wheel plate.

[0015] Compared with the prior art, the advantages and positive effects of the utility model are:

[0016] 1. The utility model provides a brake mechanism for chair wheels, which adopts the cooperation of two inclined surfaces. Through the change of the cooperation position of the inclined surfaces, a driving force is provided to drive the brake disc to move downward, thereby making the brake disc abut against the wheel piece. In order to facilitate the driving of the rotating pressure plate to rotate, a driving rod is arranged on the outer side of the rotating pressure plate, and the characteristics of the elastic body are utilized to store energy during braking, and to separate the brake disc from the wheel piece when unlocking. The utility model solves the problem that the user needs to move the chair to a suitable position in front of the table before sitting down, and then sit down. During this process, due to the limitation of the table top, the user is in a half-sitting state when adjusting the final position of the chair, which is inconvenient for younger children to use due to their weak leg strength. The device has a reasonable design, a simple structure, and is easy to process. It can effectively complete the convenient locking of the position of the learning chair. It is simple and convenient to operate, has strong functionality, and is especially convenient for different groups of people to use. It improves the practicality of the device and equipment, reduces the difficulty of operation, and fully guarantees the use needs. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the following is a brief introduction to the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor.

[0018] Figure 1 This is a schematic diagram of the structure of the utility model installed on a chair base in an embodiment;

[0019] Figure 2 for Figure 1A partial enlarged schematic diagram of the structure at A in the middle;

[0020] Figure 3 It is a partial exploded schematic diagram of the structure provided in the embodiment of the utility model;

[0021] Figure 4 It is a partial structural cross-sectional view provided in the embodiment of the utility model;

[0022] In the above figures, 1. chair wheel body; 2. wheel; 3. driving rod; 4. brake disc; 5. rotating pressure plate; 6. upper extrusion part; 7. elastic body; 8. connecting shaft; 9. locking tooth; 10. boss; 11. inclined surface; 12. slot; 13. lower extrusion part; 14. chair base. DETAILED DESCRIPTION

[0023] In order to more clearly understand the above-mentioned purpose, features and advantages of the utility model, the utility model is further described below in conjunction with the accompanying drawings and embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0024] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways than those described herein. Therefore, the present invention is not limited to the specific embodiments of the following disclosure.

[0025] Examples, such as Figure 1 to Figure 4 As shown, a brake mechanism for a chair wheel includes a chair base 14 and a chair wheel body 1, wherein the chair wheel body 1 can be selected as a positioning wheel or a universal wheel, and a wheel piece 2 is arranged on the outer side of the chair wheel body 1, that is, two wheel pieces 2 are symmetrically arranged on the chair wheel body 1 (it can also be arranged as one wheel piece 2 as needed, that is, the wheel piece 2 is arranged in the middle position), so that the lower extrusion part 13 drives the rotating pressure plate 5 to descend and act on the brake disc 4 to achieve the compression of the wheel piece 2, and then achieves locking. An extrusion mechanism is arranged below the chair base 14, which is a key mechanism for controlling the locking and contact locking of the chair wheel body 1, and its downward pressure is used to act on the chair wheel body 1, and the complete The learning chair is locked and when the downward pressure is removed, the rising reset mechanism is used to unlock the chair, which provides convenient conditions for people to move the learning chair freely and meets the use requirements. A brake disc 4 is arranged below the squeezing mechanism for braking or unlocking by moving up and down. The brake disc 4 is driven downward by the squeezing mechanism. Further: the squeezing mechanism includes an upper squeezing part 6 and a rotating pressure plate 5 used in conjunction with each other. The rotating pressure plate 5 is provided with a lower squeezing part 13 used in conjunction with the upper squeezing part 6. That is, the rotation of the rotating pressure plate 5 is used to drive the lower squeezing part 13 to realize vertical rotation and movement, thereby acting on the brake disc 4 to complete the corresponding locking work and ensure the use requirements.

[0026] In order to ensure the effective implementation of the extrusion action of the extrusion mechanism, one or both of the upper end surface of the lower extrusion part 13 and the lower end surface of the upper extrusion part 6 are set as a slope 11, which is specifically described as: the height of the slope 11 gradually increases from one end to the other end, thereby forming a smooth slope 11, and the lower end surface of the upper extrusion part 6 can be a plane (when it is a plane, its length in the rotation direction of the rotating pressure plate 5 is less than the length of the slope 11 in this direction), or it can be a slope 11. The height of the slope 11 is opposite to the direction in which the height of the slope 11 on the lower extrusion part 13 gradually increases from one end to the other end. The corresponding relationship with the upper extrusion part 6 is changed by rotating the lower extrusion part 13, thereby changing the upper and lower positions of the lower extrusion part 13. In addition, it needs to be further explained that the sum of the maximum thicknesses of the upper extrusion part 6 and the lower extrusion part 13 in the axial direction of the connecting shaft 8 is greater than the maximum distance between the bottom surface of the brake disc 4 and the upper end of the wheel plate 2, so that braking can be effectively achieved.

[0027] In order to further improve the rationality of the device, the upper extrusion part 6 and the lower extrusion part 13 are both arc-shaped structures, and the number of the upper extrusion part 6 and the lower extrusion part 13 are respectively set to two and arranged oppositely. Of course, it can also be set to one or three or more according to the use requirements, so as to provide a prerequisite for the extrusion mechanism to realize the extrusion action.

[0028] In order to ensure the rationality of the equipment establishment and ensure the stability of the equipment's coordinated structure, a connecting shaft 8 is arranged above the chair wheel body 1, and through holes are respectively opened in the brake disc 4 and the rotating pressure plate 5 to facilitate the passage of one end of the connecting shaft 8, that is, the lower extrusion portion 13 is coaxially arranged with the connecting shaft 8, and the rotating pressure plate 5 can rotate around the connecting shaft 8 as the center. On the one hand, the accuracy of the installation position of the chair wheel body 1 is guaranteed, and on the other hand, the smoothness of the subsequent movement and rotation of the chair wheel body 1 is ensured to meet the use requirements.

[0029] In order to enable the squeezing mechanism to conveniently squeeze or release the brake disc 4, a driving rod 3 is provided on the outer side of the rotating pressure plate 5 to drive it to rotate. The driving rod 3 is made integrally with the rotating pressure plate 5 and extends outward. People adjust the position of the driving rod 3 to apply power to the rotating pressure plate 5 to drive it to rotate, thereby bringing convenient conditions for locking or unlocking the chair wheel body 1 to meet the use requirements. Furthermore, an indicator arrow pointing to unlocking and locking can be provided on the upper end face of the driving rod 3 to indicate the direction in which the driving rod 3 can move, thereby facilitating people to freely choose according to different use requirements, and the recognition effect is significant.

[0030] In order to ensure the stability of the entire equipment, the upper extrusion part 6 is fixedly arranged at the corner below the chair base 14 to ensure that the extrusion mechanism is activated, thereby completing the locking of the chair wheel body 1. The chair wheel body 1 is connected to the chair base 14 through the connecting shaft 8, ensuring the connection effect between the chair wheel body 1 and the chair base 14, so that the learning chair can bear the load when people sit down. At the same time, it provides convenient conditions for the use of the learning chair in different positions and ensures smoothness during the movement.

[0031] In order to effectively improve the rationality of the establishment of equipment components, a boss 10 is arranged at the geometric center above the brake disc 4. The boss 10 is designed in a circular ring shape. On the one hand, it facilitates the close fit between the brake disc 4 and the rotating pressure plate 5, and on the other hand, it is convenient for the connecting shaft 8 to pass through. A groove 12 in a circular ring shape is provided at the bottom of the rotating pressure plate 5 for accommodating the boss 10. That is to say, when the rotating pressure plate 5 rotates, the fit between the groove 12 and the boss 10 can be guaranteed, the rotation direction can be limited, the two can be prevented from being separated, and the functionality of the device is improved.

[0032] In order to effectively complete the locking of the chair wheel body 1, especially the wheel plate 2, a locking tooth 9 for cooperating with the wheel plate 2 is provided at the bottom of the brake disc 4. The locking tooth 9 under this design can make the brake disc 4 fit the wheel plate 2, effectively increase the contact force between the two, fully improve the locking effect, and prevent the chair wheel body 1 from shifting after locking, thereby meeting the usage requirements.

[0033] In order to ensure the rationality of the equipment, a rising and resetting mechanism is provided on the brake disc 4 for driving the brake disc 4 to rise. Its function is to drive the brake disc 4 to rise during the unlocking process of the chair wheel body, thereby providing convenience for people to freely move the study chair and ensuring the use effect.

[0034] In order to fully ensure that the rising and resetting mechanism has good functionality, the rising and resetting mechanism includes an elastomer 7 for driving the brake disc 4 to separate from the wheel plate 2, wherein the elastomer 7 is a compression spring, that is to say: the elastomer 7 is mounted on the connecting shaft 8, and when the brake disc 4 descends, the compression spring is compressed. At the same time, the compression spring stores energy. When the driving rod 3 rotates to reset the extrusion mechanism, the brake disc 4 rises, thereby canceling the downward pressure on the elastomer 7. At the same time, with the help of energy storage, the rising and resetting mechanism completes the reset and waits for subsequent use. The device is reasonably set up and has a strong use effect.

[0035] During the above process: when in use, the elastic body 7 is in an extended state, the brake disc 4 and the rotating pressure plate 5 are lifted, the brake disc 4 is separated from the wheel 2, and when the chair is moved to a suitable position, the rotating pressure plate 5 is driven to rotate by the driving rod 3, driving the lower extrusion part 13 to rotate and move downward, thereby driving the brake disc 4 to move downward and compressing the elastic body 7 at the same time. When the brake disc 4 abuts against the wheel 2, the wheel 2 is locked.

[0036] The utility model adopts the cooperation of two inclined surfaces 11, and through the change of the cooperation position of the inclined surfaces 11, a driving force is provided to drive the brake disc 4 to move downward, thereby making the brake disc 4 abut against the wheel plate 2. In order to conveniently drive the rotating pressure plate 5 to rotate, a driving rod 3 is arranged on the outer side of the rotating pressure plate 5, and the characteristics of the elastic body 7 are utilized to store energy during braking, and to separate the brake disc 4 from the wheel plate 2 when unlocking. The utility model solves the problem that the user needs to move the chair to a suitable position in front of the table before sitting down, and then sit down. In this process, due to the limitation of the table top, the user is in a half-sitting state when adjusting the final position of the chair, which is inconvenient for younger children to use due to their weak leg strength. The device has a reasonable design, a simple structure, and is easy to process. It can effectively complete the convenient locking of the position of the learning chair. It is simple and convenient to operate, has strong functionality, and is especially convenient for different groups of people to use. It improves the practicality of the device and equipment, reduces the difficulty of operation, and fully guarantees the use needs.

[0037] The above description is only a preferred embodiment of the present invention and does not limit the present invention in other forms. Any technician familiar with the profession may use the technical content disclosed above to change or modify it into an equivalent embodiment with equivalent changes and apply it to other fields. However, any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the protection scope of the technical solution of the present invention.

Claims

1. A brake mechanism for a chair wheel, comprising a chair base and a chair wheel body, wherein a wheel piece is arranged on the outer side of the chair wheel body, characterized in that: A squeezing mechanism is arranged below the chair base, and a brake disc is arranged below the squeezing mechanism for braking or unlocking by moving up and down. The brake disc is driven to move downward by the squeezing mechanism. The squeezing mechanism includes an upper squeezing part and a rotating pressure plate used in conjunction with each other, and a lower squeezing part for cooperating with the upper squeezing part is arranged on the rotating pressure plate.

2. A brake mechanism for a chair wheel according to claim 1, characterized in that: One or both of the upper end surface of the lower extrusion portion and the lower end surface of the upper extrusion portion are configured as inclined surfaces.

3. A chair wheel brake mechanism according to claim 2, characterized in that: The upper extrusion portion and the lower extrusion portion are both arc-shaped structures.

4. A chair wheel brake mechanism according to any one of claims 1 to 3, characterized in that: A connecting shaft is arranged above the chair wheel body, and a through hole for one end of the connecting shaft to pass through is respectively opened in the brake disc and the rotating pressure disc.

5. A chair wheel brake mechanism according to claim 4, characterized in that: A driving rod for driving the rotating pressure plate to rotate is arranged on the outer side of the rotating pressure plate.

6. A brake mechanism for a chair wheel according to claim 5, characterized in that: The upper extrusion part is fixedly arranged at the corner below the chair base, and the chair wheel body is connected to the chair base through a connecting shaft.

7. A chair wheel brake mechanism according to claim 6, characterized in that: A boss is arranged at the geometric center above the brake disc, and a groove in a circular ring shape for accommodating the boss is provided at the bottom of the rotating pressure plate.

8. The brake mechanism for a chair wheel according to claim 7, characterized in that: The bottom of the brake disc is provided with locking teeth for matching with the wheel piece.

9. A chair wheel brake mechanism according to any one of claims 1-3 and 5-8, characterized in that: The brake disc is provided with a lifting and resetting mechanism for driving the brake disc to rise.

10. A chair wheel brake mechanism according to claim 9, characterized in that: The lifting and resetting mechanism includes an elastic body used for driving the brake disc and the wheel plate to separate.

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