Anti-falling magnetic dumbbell

Abstract

The application relates to the technical field of fitness equipment, in particular to a magnetic dumbbell capable of preventing falling, which comprises an electromagnetic ring, a U-shaped ring, a mounting belt, a locking assembly and a filling assembly. The inner ring of the electromagnetic ring is fixedly installed with the U-shaped ring. The U-shaped ring comprises an A end and a B end. The A end is fixedly installed with the mounting belt. The B end is provided with a mounting groove matched with the mounting belt. The locking assembly for fixing the mounting belt on the U-shaped ring is installed at the position of the mounting groove close to the B end. The distance of the mounting belt between the A end and the B end can be adjusted. The U-shaped ring is installed with the filling assembly for filling the gap between the mounting belt between the A end and the B end and the U-shaped ring and the arm. The mutual cooperation of the locking assembly and the filling assembly can realize the size adjustment of the magnetic dumbbell, adapt to users with different body shapes, prevent the magnetic dumbbell from falling during the movement and affect the fitness effect.

Description

Technical Field

[0001] This invention relates to the field of fitness equipment technology, specifically to a magnetic dumbbell that prevents it from falling off. Background Technology

[0002] Magnetic dumbbells are a common type of fitness equipment, often loved by fitness enthusiasts and frequently used in the field of fitness equipment technology.

[0003] To prevent unsuitable fits due to varying arm sizes and the risk of weight slippage during exercise due to muscle tension and relaxation, which could reduce training effectiveness and negatively impact motivation, existing wearable magnetic dumbbells employ adjustable sizes to securely fasten the dumbbells to the arm. These dumbbells are generally divided into one-piece molded designs and detachable designs. One-piece molded dumbbells, due to their limited elasticity, cannot fit all users and are therefore more suitable for personal purchase. Using them in gyms would significantly increase operating costs. Detachable designs... Magnetic dumbbells, composed of single magnetic blocks with fixed magnets, are cumbersome to assemble and disassemble, making them difficult to operate with one hand. Furthermore, both types of magnetic dumbbells have poor breathability, which can lead to skin hypoxia, muscle soreness, and abnormal sweating in the wearing area after prolonged exercise. On the one hand, these types of magnetic dumbbells are prone to rotating and falling off when worn loosely, and can restrict muscle tension and relaxation when worn tightly, affecting the effectiveness of the equipment. On the other hand, existing magnetic dumbbells are not suitable for the user's arm size, increasing the cost of purchase and operation, and they are easily damaged, adding extra burden.

[0004] To address this, a magnetic dumbbell designed to prevent slippage is proposed. On one hand, this design allows the magnetic dumbbell to be used by a wider range of users, accommodating arms of varying sizes and reducing operating costs. On the other hand, it prevents the magnetic dumbbell from slipping off during exercise, thus improving the workout results. It also allows for better air circulation in the wearing area, increasing breathability and enhancing the user experience. Summary of the Invention

[0005] The purpose of this invention is to provide a non-slip magnetic dumbbell, solving the problems of existing wearable magnetic dumbbells being unsuitable for arms of different sizes, prone to slipping off, having excessive clamping force, and being unbreathable, thus affecting the user experience. Therefore, a non-slip magnetic dumbbell was designed. On the one hand, it ensures that the size can be freely adjusted while preventing the magnetic dumbbell from slipping off, and it also increases the product's breathability, enhances the user experience, and reduces operating costs. On the other hand, it better prevents the magnetic dumbbell from slipping off during exercise, thus preventing it from affecting the magnetic attraction and repulsion. Furthermore, it can be easily put on and taken off with one hand, reducing physical exertion.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A magnetic dumbbell designed to prevent slippage includes an electromagnetic ring, a U-shaped ring, a mounting strap, a locking assembly, and a filling assembly. The U-shaped ring is fixedly mounted on the inner ring of the electromagnetic ring. The U-shaped ring includes an A end and a B end. The mounting strap is fixedly mounted on the A end, and the B end has a mounting groove that mates with the mounting strap. A locking assembly is installed near the B end of the mounting groove to fix the mounting strap to the U-shaped ring. The distance between the mounting straps at the A end and the B end can be adjusted arbitrarily. A filling assembly is installed on the U-shaped ring to fill the gaps between the mounting straps at the A end and the B end, as well as between the U-shaped ring and the arm.

[0008] It is known that there are many components that can prevent magnetic dumbbells from falling off and allow for size adjustment, such as using buckles, wrapping straps, and elastic bands to fix and constrain the magnetic dumbbells. However, compared with the design of this solution, firstly, during exercise, because muscles contract and expand, if you feel uncomfortable, you need to adjust the tension multiple times to find the right level; secondly, during exercise, sweat can soak the wrapping straps, reducing friction and making the magnetic dumbbells easy to fall off, affecting the fitness effect. Therefore, this solution uses a combination of mounting straps, pawls, support plates, grooves, and locking posts to initially fix arms of different thicknesses.

[0009] Preferably, a locking groove is provided on the side of the B end away from the mounting groove. The locking assembly includes a locking post, a pawl, a groove, a support plate, and a cylindrical spring. The locking post is slidably installed in the locking groove, and the locking post includes a threaded part and a shaft part. Multiple pawls are fixedly installed on the shaft part. Multiple grooves that cooperate with the pawls are provided on the mounting strip. In the natural state, the pawls and grooves are in contact with each other. The threaded part extends outside the locking groove, and the length of the threaded part is greater than the length of the shaft part. A cylindrical spring is elastically installed between the shaft part and the locking groove. The threaded part has an external thread. A support plate is fixedly installed in the locking groove. The shaft part is rotatably installed on the support plate. The shaft part is threadedly connected to the threaded part through an internal thread.

[0010] In the above method, the hand passes through two magnetic dumbbells, moving one dumbbell to the upper arm and the other to the forearm. Holding the U-shaped ring with one hand, the mounting strap is inserted into the mounting groove. The groove and pawl engage, allowing the mounting strap to move inwards but not outwards, thus initially securing the magnetic dumbbells. By moving the arm, the magnetic dumbbell on the forearm can engage with the one on the upper arm, and then the dumbbell on the forearm is secured. At this point, for users with different strength levels, the extension distance of the locking pin can be adjusted by rotating the threaded part. According to the lever principle, the support plate acts as the fulcrum for the locking pin. The more the threaded part extends, the greater the expansion force on the optical shaft, causing the pawl to disengage from the mounting strap. After normal exercise, pressing the threaded part causes the locking pin to overcome the tension of the cylindrical spring and move towards the mounting strap. At this point, the optical shaft lifts, causing the pawl to move away from the mounting strap, releasing the U-shaped ring from the arm.

[0011] As can be seen, there are many components that can prevent magnetic dumbbells from loosening. Considering that muscles will continuously contract and relax during exercise, the components that completely fix the magnetic dumbbells should ideally have a certain degree of elasticity and pressure resistance. Therefore, this solution uses a filling air bladder and a U-shaped air bladder to completely fix the magnetic dumbbells.

[0012] Preferably, the filling assembly includes a filling airbag, an inflation mechanism, and a U-shaped airbag. The filling airbag is fixedly installed at the end of the mounting belt away from the electromagnetic ring. The inflation mechanism is fixedly installed in the mounting groove. The inflation mechanism includes an air cylinder, a piston, a return spring, an inlet check valve, an outlet check valve, and a connecting pipe. The air cylinder is fixedly installed in the mounting groove, and its bottom end is in contact with the inner wall of the U-shaped ring. The inlet check valve and the outlet check valve are fixedly installed at the bottom end of the air cylinder. The piston is slidably installed inside the air cylinder, and one end of the piston extends into the U-shaped ring. In addition, a return spring is elastically installed between the piston and the bottom of the air cylinder. A connecting pipe is installed between the air outlet check valve and the filling air bladder. The connecting pipe is made of elastic material. The tensile limit distance of the connecting pipe is greater than the effective stroke distance of the mounting belt. A U-shaped air bladder is movably installed at the end of the U-shaped ring facing the elbow. An interconnected air passage is installed between the U-shaped air bladder and the filling air bladder. After the air injection mechanism introduces gas, it inflates the filling air bladder and the U-shaped air bladder in sequence. After the U-shaped air bladder is inflated, the outer surface of the U-shaped air bladder is inclined.

[0013] In the above scheme, by pressing the piston, the piston overcomes the tension of the return spring and slides into the air cylinder. During this sliding process, the gas squeezed by the piston enters the connecting pipe through the outlet one-way valve. When the piston is reset by the return spring, the inlet one-way valve guides the external gas into the air cylinder. Pressing the piston repeatedly causes gas to continuously enter the connecting pipe through the outlet one-way valve. The inflatable bladder installed on the mounting strap will inflate first. The reaction force generated after the inflatable bladder contacts the inner wall of the mounting groove will squeeze the mounting strap closer to the pawl, increasing the friction between the pawl and the groove. Under the action of the locking pin, the pawl maintains the limit on the groove. At this time, the gas in the inflatable bladder will flow into the U-shaped air bladder through the air passage. On the one hand, the expansion of the inflatable bladder fills the gap between the mounting strap exposed to the outside and the skin. On the other hand, the inclined surface formed by the expansion of the U-shaped air bladder can better fit the arm. In addition, the U-shaped air bladder has a certain pressure resistance. While maintaining sufficient friction with the skin, it can also provide comfort to the user during exercise.

[0014] It is known that there are many mechanisms to protect the U-shaped airbag and reduce wear. For example, the U-shaped airbag can be made of high-strength materials. However, compared with this solution, firstly, if the U-shaped airbag is made of high-strength materials, it will increase the extra burden on the user during inflation. Frequent pressing of the piston will cause finger soreness and numbness, affecting mood. Secondly, it will increase the production cost of the magnetic dumbbell, which is not conducive to popularization and mass use, and will affect sales. Therefore, this solution adopts a contraction mechanism, which plays a guiding role during the expansion of the U-shaped airbag and plays an auxiliary contraction and protection role during the contraction of the U-shaped airbag.

[0015] Preferably, the U-shaped ring has a protective groove that cooperates with the U-shaped airbag. The contraction mechanism includes a movable plate, a fixed plate, and a reciprocating spring. The fixed plate is fixedly installed in the protective groove, and the movable plate is slidably installed on the fixed plate. The movable plate and the fixed plate are elastically connected by a reciprocating spring that contracts the U-shaped airbag, and a part of the U-shaped airbag is fixedly installed on the movable plate.

[0016] In the above scheme, when the U-shaped airbag is not inflated, most of the U-shaped airbag will retract into the protective groove under the action of the reciprocating spring. When the U-shaped airbag inflates, the expansion of the U-shaped airbag will drive the moving plate to move outward against the tension of the reciprocating spring. The contraction and movement of the moving plate will not affect the user's exercise. When the U-shaped airbag goes from inflated to contracted, the return of the reciprocating spring will pull the moving plate to slide towards the fixed plate. The movement of the moving plate will drive the U-shaped airbag to retract into the protective groove, thereby protecting the U-shaped airbag.

[0017] It is known that there are many components that can facilitate air circulation within the mounting slot. For example, modifying the structure of the magnetic dumbbells, adding ventilation holes, or using a design with spaced-out electromagnetic blocks can give the magnetic dumbbells good air permeability. However, compared to this solution, firstly, adding more ventilation holes will reduce the strength of the equipment itself, making it easy to be damaged due to improper operation. Secondly, although spaced-out electromagnetic blocks increase air permeability, they weaken the magnetic attraction and repulsion characteristics between the two magnetic dumbbells, reducing the training effect. Therefore, this solution uses the movement of the user's forearm constantly contacting the upper arm during exercise, and the reciprocating movement of the telescopic blocks to achieve air circulation within the mounting slot, allowing the sweat generated in the area where the magnetic dumbbells contact the skin to be carried away by the air.

[0018] Preferably, the inner ring of the U-shaped ring has multiple vent holes, an exhaust mechanism is fixedly installed in the mounting groove, a telescopic block is movably installed in the exhaust mechanism, and a telescopic spring is elastically installed between the telescopic block and the mounting groove. When the telescopic block is continuously squeezed, the outside air will flow into the mounting groove through the vent holes under the drive of the telescopic spring.

[0019] In the above scheme, when the user exercises according to the operation, the skin on the forearm will continuously press against the upper arm, squeezing the telescopic block. The telescopic block overcomes the tension of the telescopic spring and slides in the exhaust mechanism. The continuous reciprocating motion of the telescopic block creates changes in internal and external air pressure. Accompanied by the continuous tension and contraction of the muscles, the exchange of external air and gas in the installation slot is achieved through multiple ventilation holes opened on the installation slot.

[0020] It is known that there are many components that can controllably release gas from the inflatable airbag and the U-shaped airbag. Generally, an exhaust valve can be used to release gas. For the magnetic dumbbell designed in this case, considering that users will sweat during exercise, and that sweat can easily get on the mounting strap and into the mounting groove, the accumulated sweat can not only affect the performance of the magnetic dumbbell, but also affect the mood of the next user. Therefore, by setting the installation position of the exhaust valve, the gas in the inflatable airbag and the U-shaped airbag can be reused, so that the discharged gas can clean some of the sweat on the mounting strap.

[0021] Preferably, an exhaust valve for venting is fixedly installed between the end of the U-shaped airbag and the locking groove, and the switch of the exhaust valve is fixedly connected to the optical axis, with the exhaust port of the exhaust valve tilted towards end A.

[0022] In the above scheme, after the user completes the exercise, by pressing the threaded part, the threaded part drives the optical shaft part to move downwards against the tension of the cylindrical spring. The movement of the optical shaft part drives the opening and closing of the exhaust valve to complete the exhaust of gas from the filling airbag and the U-shaped airbag. The exhaust gas flows through the exhaust hole to the locking groove and is discharged onto the mounting strip between end A and end B, blowing off some of the sweat on the groove and achieving a cleaning effect.

[0023] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0024] 1. Existing magnetic dumbbells are inconvenient to wear due to their inability to adjust size, and their poor breathability leads to them slipping off when soaked with sweat during exercise. To solve these problems, an installation strap, locking component, and padding component are used. The locking component secures the installation strap to the U-shaped ring, and the padding component completely fixes the magnetic dumbbell to the arm. On the one hand, the locking component allows for adjustment of the installation strap distance to accommodate different users. On the other hand, while ensuring a secure fit and preventing slippage, it increases the breathability of the magnetic dumbbell, improves the user experience, and reduces the operating costs of gyms purchasing related equipment.

[0025] 2. This invention, through the design of the mounting strap, locking post, pawl, and cylindrical spring, aims to allow for arbitrary adjustment of the size of the magnetic dumbbell and to initially secure it around the arm. The locking post, mounting strap, pawl, and cylindrical spring are designed to lock the mounting strap in its extended position by engaging the pawl on the locking post with a groove on the mounting strap, thus fixing the strap within the U-shaped ring. The locking post allows the threaded portion to be rotated to achieve a set distance of translation, adjusting the effect of muscle expansion on the pawl. When the pressure within the U-shaped ring becomes excessive, the pawl automatically disengages from the mounting strap. The combined effect of these components not only achieves the function of adjusting the size of the magnetic dumbbell and initially securing it to the arm, but also allows for quick unlocking by pressing the locking post in case of emergencies, allowing the magnetic dumbbell to disengage from the arm.

[0026] 3. The present invention, through its exhaust mechanism, ventilation holes, and filling components, aims to allow the magnetic dumbbell to fit snugly against the arm, maintaining comfort while also providing dynamic gas flow characteristics. The filling components ensure the magnetic dumbbell is completely fixed to the arm and ensure a tighter fit between the mounting strap and the pawl, preventing the pawl from loosening and thus securing the magnetic dumbbell to the arm. The exhaust mechanism and ventilation holes allow for pressure changes within the mounting slot during arm exercises, and facilitate gas exchange between the wearing area and the outside air through the ventilation holes as the arm muscles relax and contract. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the structure of the magnetic dumbbell of the present invention after removing part of the outer shell;

[0028] Figure 2 For the present invention Figure 1 Sectional view of FF;

[0029] Figure 3 For the present invention Figure 2 Enlarged view of section I;

[0030] Figure 4 For the present invention Figure 2 Internal cross-sectional view of the gas injection mechanism section;

[0031] Figure 5 This is a schematic diagram of the structure of the magnetic dumbbell of the present invention, including the outer shell;

[0032] Figure 6 For the present invention Figure 2 Enlarged view of section E in the middle;

[0033] Figure 7 For the present invention Figure 1 Sectional view of KK;

[0034] Figure 8 For the present invention Figure 7 Enlarged view of section M in the middle.

[0035] In the diagram: 1. Electromagnetic ring; 11. Counterweight; 2. U-shaped ring; 21. Vent hole; 22. Protective groove; 23. Retraction mechanism; 231. Reciprocating spring; 232. Fixed plate; 233. Moving plate; 24. Exhaust valve; 241. Exhaust hole; 242. Switch; 3. Mounting strip; 31. Protrusion; 32. Slide groove; 4. Mounting groove; 41. Exhaust mechanism; 411. Telescopic block; 412. Telescopic spring; 413. Compression airbag; 5. 51. Locking assembly; 51. Locking post; 511. Threaded part; 512. Optical shaft part; 52. Pawl; 53. Groove; 54. Support plate; 55. Cylindrical spring; 6. Filling assembly; 61. Inflation mechanism; 611. Air cylinder; 612. Piston; 613. Return spring; 614. Inlet check valve; 615. Outlet check valve; 616. Connecting pipe; 62. Filling airbag; 63. U-shaped airbag; 631. Inclined surface; 7. Locking groove. Detailed Implementation

[0036] The technical solutions of the present invention will be described in detail below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Compared with the implementation schemes in the present invention, all other solutions obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0037] As one embodiment of the present invention, refer to Figure 1The inner ring of the electromagnetic ring 1 is fixedly equipped with a U-shaped ring 2, and the main bodies of both the electromagnetic ring 1 and the U-shaped ring 2 are made of elastic material. The U-shaped ring 2 includes an A end and a B end. An installation strap 3 is fixedly installed on the A end, and an installation groove 4 that cooperates with the installation strap 3 is opened on the B end. A locking component 5 is installed on the installation groove 4 near the B end to fix the installation strap 3 on the U-shaped ring 2. The installation strap 3 between the A end and the B end can be adjusted arbitrarily to meet the needs of different users. A filling component 6 is installed on the U-shaped ring 2 to fill the gap between the A end and the B end, as well as between the U-shaped ring 2 and the arm, to prevent the installation strap 3 from pinching hair or skin during exercise and causing stress response in the user.

[0038] As one embodiment of the present invention, refer to Figure 2 and Figure 3 A locking groove 7 is provided on the side of end B away from the mounting groove 4. The locking assembly 5 includes a locking post 51, a pawl 52, a groove 53, a support plate 54, and a cylindrical spring 55. The locking post 51 is slidably installed in the locking groove 7, and the locking post 51 includes a threaded part 511 and an optical axis part 512. Multiple pawls 52 are fixedly installed on the optical axis part 512. The locking post 51 provides support for the pawls 52 and completes the synchronous movement of multiple pawls 52, improving the locking force of the pawls 52 on the mounting band 3. The mounting band 3 has a groove 53 that cooperates with the pawls 52. In its natural state... The pawl 52 and the groove 53 fit together. The threaded part 511 extends to the outside of the locking groove 7, and the length of the threaded part 511 is greater than the length of the optical axis part 512. A cylindrical spring 55 is elastically installed between the optical axis part 512 and the locking groove 7, so that the user can press the threaded part 511 with a small force to disengage the pawl 52 from the mounting band 3. The threaded part 511 has an external thread. A support plate 54 is fixedly installed in the locking groove 7. The optical axis part 512 is rotatably connected to the support plate 54. The threaded part 511 is threadedly connected to the optical axis part 512.

[0039] As one embodiment of the present invention, refer to Figure 2 , Figure 4 and Figure 5The filling assembly 6 includes an inflation mechanism 61 and an inflation bladder 62. The inflation bladder 62 is fixedly installed at the end of the mounting band 3 away from the electromagnetic ring 1. The inflation mechanism 61 is fixedly installed in the mounting groove 4. The inflation mechanism 61 inflates the inflation bladder 62 and the U-shaped air bladder 63. The inflation mechanism 61 includes an air cylinder 611, a piston 612, a return spring 613, an inlet one-way valve 614, an outlet one-way valve 615, and a connecting pipe 616. The air cylinder 611 is fixedly installed in the mounting groove 4, and its bottom end is in contact with the inner wall of the U-shaped ring 2. The inlet one-way valve 614 and the outlet one-way valve 615 are fixedly installed at the bottom end of the air cylinder 611. The piston 612 is slidably installed inside the air cylinder 611, and one end of the piston 612 extends outside the U-shaped ring 2. The piston 612 and the bottom end of the air cylinder 611 are elastically installed together with a return spring 613. When the piston 612 is pressed, the piston 612 and the return spring 613 cooperate to continuously discharge the gas in the air cylinder 611 into the filling air bladder 62 and the U-shaped air bladder 63 through the one-way valve 615. The one-way valve 615 and the filling air bladder 62 are connected by a connecting pipe 616, which is made of elastic material. The tensile limit distance of the connecting pipe 616 is greater than the effective stroke distance of the mounting belt 3, ensuring the stability of the connection between the filling air bladder 62 and the connecting pipe 616. The U-shaped ring 2 is fitted with a U-shaped air bladder 63 at the end facing the elbow. The U-shaped air bladder 63 and the filling air bladder 62 are connected by an air passage. After the air injection mechanism 61 introduces gas, it inflates the filling air bladder 62 and the U-shaped air bladder 63 in sequence. After the U-shaped air bladder 63 is inflated, the outer surface of the U-shaped air bladder 63 is inclined 631, which better facilitates contact with the arm.

[0040] As one embodiment of the present invention, refer to Figure 5 and Figure 8 The mounting band 3 has a protrusion 31 fixedly installed on its side end, and the protrusion 31 is arc-shaped. The side wall of the U-shaped ring 2 has a sliding groove 32 that cooperates with the protrusion 31, and the sliding groove 32 is located in the middle of the mounting groove 4 to ensure that the mounting band 3 sliding in the mounting groove 4 will not shake randomly. The distance from the protrusion 31 to the inner circle of the U-shaped ring 2 is less than the distance after the filling air bag 62 is inflated, which strengthens the limitation of the pawl 52 on the mounting band 3.

[0041] As one embodiment of the present invention, refer to Figure 2 , Figure 6 and Figure 7The inner ring of the U-shaped ring 2 has multiple ventilation holes 21. An exhaust mechanism 41 is fixedly installed in the mounting groove 4. The exhaust mechanism 41 includes a telescopic block 411, a telescopic spring 412, and a compression airbag 413. The telescopic block 411 is slidably installed in the mounting groove 4, and one end of the telescopic block 411 extends to the outer end of the inner ring of the U-shaped ring 2. The free end of the telescopic block 411 and the compression airbag 413 are elastically installed together between the telescopic spring 412 and the mounting groove 4. The telescopic spring 412 and the compression airbag 413 do not overlap at all. When the telescopic block 411 is continuously squeezed, the compression airbag 413 will change under the drive of the telescopic spring 412, allowing outside air to flow into the mounting groove 4 through the ventilation holes 21.

[0042] As one embodiment of the present invention, refer to Figure 5 A counterweight 11 is fixedly installed on the electromagnetic ring 1, and the center of gravity of the U-shaped ring 2 is located at the connection between the U-shaped ring 2 and the counterweight 11. When the U-shaped ring 2 is worn on the arm, the A and B ends of the U-shaped ring 2 face the shoulder, and the center of gravity of the U-shaped ring 2 faces the floor, ensuring that the magnetic dumbbell will not rotate significantly during exercise, and at the same time ensuring that the A and B ends of the magnetic dumbbell placed on the ground will tilt up.

[0043] As one embodiment of the present invention, refer to Figure 7 and Figure 8 An exhaust valve 24 for venting is fixedly installed between the end of the U-shaped airbag 63 and the locking groove 7, and the switch 242 of the exhaust valve 24 is fixedly connected to the optical axis 512. The exhaust hole 241 of the exhaust valve 24 is tilted towards end A, and the exhaust gas is discharged along the locking groove 7 to complete the cleaning of the sweat on the installation belt 3 between end A and end B.

[0044] As one embodiment of the present invention, refer to Figure 5 and Figure 8 The U-shaped ring 2 has a protective groove 22 that cooperates with the U-shaped airbag 63. The contraction mechanism 23 includes a fixed plate 232, a reciprocating spring 231, and a movable plate 233. The fixed plate 232 is fixedly installed in the protective groove 22, and the movable plate 233 is slidably installed on the fixed plate 232. The reciprocating spring 231 that causes the U-shaped airbag 63 to contract is elastically connected between the movable plate 233 and the fixed plate 232. A part of the U-shaped airbag 63 is fixedly installed on the movable plate 233, thereby protecting the U-shaped airbag 63 and preventing wear.

[0045] Working principle:

[0046] Suppose that the user is about to wear magnetic dumbbells and complete an exercise.

[0047] As for the motion trajectory and usage method of the magnetic dumbbell of this invention, please refer to Figure 1 , Figure 2 and Figure 5 First, the user needs to pick up the two magnetic dumbbells, press the locking post 51 to pull out the mounting strap 3 to the appropriate size, and put it on the arm. The U-shaped air bladders 63 of both magnetic dumbbells should be placed facing the elbow. Press the U-shaped ring 2 with the other hand to move the mounting strap 3 towards end B. When the mounting strap 3 moves to the appropriate position, rotate the threaded part 511 to adjust the overload protection function of the pawl 52 for the mounting strap 3. After the initial fixation of the two magnetic dumbbells is completed, the user can move the arm so that the magnetic dumbbells on the upper arm and forearm can cooperate with each other during the exercise.

[0048] By pressing the piston 612 located on the side wall of the magnetic dumbbell, the piston 612 slides into the mounting groove 4 against the tension of the return spring 613. At this time, the gas in the air cylinder 611 enters the connecting pipe 616 through the outlet check valve 615. During the process of releasing the piston 612, the piston 612 rebounds under the action of the return spring 613, driving outside air into the air cylinder 611 through the inlet check valve 614. By continuously pressing the piston 612, air is continuously discharged through the connecting pipe 616 into the filling air bladder 62 and the U-shaped air bladder 63. The direction of gas flow is from... Figure 2 and Figure 5 As shown by the middle arrow, the filling air bladder 62 and the U-shaped air bladder 63 expand sequentially. The expansion of the filling air bladder 62 fills the gap between the mounting strap 3 and the arm between end A and end B. The expanded portion of the filling air bladder 62 in the mounting groove 4 will generate a reaction force with the inner wall of the mounting groove 4, making the mounting strap 3 more tightly attached to the pawl 52, ensuring that the pawl 52 limits the mounting strap 3. After the U-shaped air bladder 63 expands, the resulting inclined surface 631 will tilt towards the arm, and the gas in the U-shaped air bladder 63 has a higher pressure than the outside air, which completes the mutual contact with the arm, increasing the friction between the magnetic dumbbell and the arm, preventing it from falling off during use. The setting of the center of gravity of the magnetic dumbbell prevents the magnetic dumbbell from shifting too much during use, causing magnetic displacement and affecting the use effect.

[0049] During exercise, the counterweight 11 fixedly installed on the electromagnetic ring 1 changes the center of gravity of the magnetic dumbbell, keeping the center of gravity of the magnetic dumbbell facing the ground, thus better preventing the rotation and movement of the magnetic dumbbell during exercise.

[0050] During use, the magnetic properties of the magnetic dumbbells on the upper and lower arms are adjusted to be the same. Through the property of magnetic repulsion, the fitness effect is achieved. During the exercise, the forearm and upper arm need to be relatively close together. During this close contact, the skin of the forearm will be squeezed against the telescopic block 411. After being squeezed, the telescopic block 411 will be subjected to the action of the telescopic spring 412 and the movement of the arm to form a reciprocating motion in the mounting groove 4. During the exercise, the gas in the compression airbag 413 is continuously squeezed with the movement of the telescopic block 411. With the continuous expansion and contraction of the muscles, a pressure difference is formed between the inside and outside, allowing outside air to enter the mounting groove 4 through the ventilation hole 21. While circulating the air, the sweat formed in the wearing area can also be evaporated with the air circulation, preventing the magnetic dumbbells from getting wet and reducing the friction between the magnetic dumbbells and the arm, which would cause them to fall off and affect the use effect.

[0051] After training is completed, press the locking pin 51 with the other hand. The movement of the locking pin 51 drives the switch 242, causing the gas in the U-shaped airbag 63 and the filling airbag 62 to be discharged through the exhaust valve 24. The gas in the U-shaped airbag 63 and the filling airbag 62 is discharged from the locking groove 7 towards end A and end B, blowing off the sweat that adheres to the groove 53 between end A and end B due to exercise, preventing excessive sweat from entering the mounting groove 4 and affecting the next use. During the exhaust process of the U-shaped airbag 63, due to the reduction of internal gas, the pulling force of the U-shaped airbag 63 on the moving plate 233 will weaken. At this time, under the action of the reciprocating spring 231, the moving plate 233 will be pulled towards the fixed plate 232. The movement of the moving plate 233 will pull the U-shaped airbag 63 into the protective groove 22, completing the protection of the U-shaped airbag 63.

[0052] At this time, keep pressing the locking post 51, pull out the installation strap 3 to unlock the magnetic dumbbell from the arm, and then remove the magnetic dumbbell from the arm. If there is sweat in the installation slot 4, the outside air can flow freely into the installation slot 4 through the vent 21 to avoid the formation of a static pressure zone, which would cause the sweat to erode the filling airbag 62 due to poor air circulation in the installation slot 4.

[0053] The foregoing has described the embodiments of the present invention. However, those skilled in the art can make various changes, modifications and substitutions to the embodiments based on an understanding of the principles of the present invention. The scope of the present invention is defined by the claims and related content.

Claims

1. A magnetic dumbbell designed to prevent slippage, comprising an electromagnetic ring (1) and a U-shaped ring (2), characterized in that: It also includes an installation band (3), an installation groove (4), a locking component (5), and a filling component (6). The inner ring of the electromagnetic ring (1) is fixedly installed with a U-shaped ring (2). The U-shaped ring (2) includes an A end and a B end. The A end is fixedly installed with an installation band (3). The B end is provided with an installation groove (4) that cooperates with the installation band (3). The installation groove (4) is installed near the B end with a locking component (5) that fixes the installation band (3) on the U-shaped ring (2). The distance between the A end and the B end of the installation band (3) can be adjusted arbitrarily. The U-shaped ring (2) is installed with a filling component (6) that fills the gap between the A end, the B end, the installation band (3), and the arm. A locking groove (7) is provided on the side of the B end away from the mounting groove (4). The locking assembly (5) includes a locking pin (51), a pawl (52), a groove (53), a support plate (54), and a cylindrical spring (55). The locking pin (51) is movably installed in the locking groove (7), and one end of the locking pin (51) extends outside the locking groove (7). Multiple pawls (52) are fixedly installed on the locking pin (51). The multiple pawls (52) are located in the mounting groove (4). The mounting strip (3) has an opening The device has multiple grooves (53) that cooperate with the pawl (52). In its natural state, the pawl (52) and the grooves (53) fit together. A support plate (54) is fixedly installed in the locking groove (7). The locking pin (51) is rotatably installed on the support plate (54). The lengths of the locking pin (51) at both ends of the support plate (54) are different, and the length at one end of the locking groove (7) is greater than the length at the end where the pawl (52) is installed. A cylindrical spring (55) is elastically installed on the locking pin (51). The locking post (51) includes a threaded part (511) and an optical axis part (512). The threaded part (511) is threadedly connected to the optical axis part (512) by a thread, and the length of the threaded part (511) extending to the support plate (54) at its shortest point is greater than the length of the optical axis part (512) at the other end of the support plate (54). The cylindrical spring (55) is connected between the optical axis part (512) and the locking groove (7). The filling assembly (6) includes an air injection mechanism (61) and a filling airbag (62). The air injection mechanism (61) is fixedly installed in the mounting groove (4). The filling airbag (62) is fixedly installed on the end of the mounting strip (3) away from the electromagnetic ring (1). The air injection mechanism (61) includes an air cylinder (611), a piston (612), a return spring (613), an inlet one-way valve (614), an outlet one-way valve (615), and a connecting pipe (616). The air cylinder (611) is fixedly installed in the mounting groove (4), and the bottom end of the air cylinder (611) is in contact with the inner wall of the U-shaped ring (2). An inlet check valve (614) and an outlet check valve (615) are fixedly installed at the bottom of the air cylinder (611). A piston (612) is slidably installed inside the air cylinder (611), and one end of the piston (612) extends outside the air cylinder (611). A return spring (613) is elastically installed between the piston (612) and the bottom of the air cylinder (611). A connecting pipe (616) is installed between the outlet check valve (615) and the filling air bag (62). The connecting pipe (616) is made of elastic material, and the tensile limit distance of the connecting pipe (616) is greater than the effective stroke distance of the mounting belt (3). A U-shaped airbag (63) is installed at one end of the U-shaped ring (2). The U-shaped airbag (63) and the filling airbag (62) are interconnected. After the U-shaped airbag (63) is inflated, the outer surface of the U-shaped airbag (63) is a slope (631). When the airbag (62) is installed on the mounting strip (3), it will first expand. The reaction force generated after the expansion of the airbag (62) comes into contact with the inner wall of the mounting groove (4) will squeeze the mounting strip (3) closer to the pawl (52), increasing the friction between the pawl (52) and the groove (53). Under the action of the locking pin (51), the pawl (52) will keep the groove (53) in place. At this time, the gas in the airbag (62) will flow into the U-shaped airbag (63) through the air passage. An exhaust valve (24) for venting is fixedly installed between the end of the U-shaped airbag (63) near the U-shaped ring (2) and the locking groove (7), and the switch (242) of the exhaust valve (24) is fixedly connected to the optical axis (512), and the exhaust hole (241) of the exhaust valve (24) is tilted towards end A; The mounting strip (3) has a protrusion (31) fixedly installed on its side end, and the protrusion (31) is arc-shaped. The side wall of the U-shaped ring (2) is provided with a sliding groove (32) that cooperates with the protrusion (31), and the sliding groove (32) is located in the middle of the mounting groove (4). The distance from the protrusion (31) to the inner ring of the U-shaped ring (2) is less than the distance after the filling airbag (62) is inflated. The inner ring of the U-shaped ring (2) has multiple ventilation holes (21). The mounting groove (4) is fixedly installed with an exhaust mechanism (41) on the side near end A. The exhaust mechanism (41) includes a telescopic block (411), a telescopic spring (412), and a compression airbag (413). The telescopic block (411) is slidably installed in the mounting groove (4), and one end of the telescopic block (411) extends to the outer end of the inner ring of the U-shaped ring (2). The free end of the telescopic block (411) and the mounting groove (4) are elastically installed together with the telescopic spring (412) and the compression airbag (413), and the telescopic spring (412) and the compression airbag (413) do not overlap at all. A counterweight (11) is fixedly installed on the electromagnetic ring (1), and the center of gravity of the U-shaped ring (2) is located at the connection between the U-shaped ring (2) and the counterweight (11); The U-shaped ring (2) has a protective groove (22) that cooperates with the U-shaped airbag (63). The contraction mechanism (23) includes a fixed plate (232), a reciprocating spring (231), and a movable plate (233). The fixed plate (232) is fixedly installed in the protective groove (22). The movable plate (233) is slidably installed on the fixed plate (232). The reciprocating spring (231) that causes the U-shaped airbag (63) to contract is elastically connected between the movable plate (233) and the fixed plate (232). A part of the U-shaped airbag (63) is fixedly installed on the movable plate (233).

Images