Locking structure of dumbbell balancing weight

Abstract

The utility model discloses a locking structure of dumbbell balancing weights, which comprises a base, a plurality of balancing weights clamped on the base, a mounting frame lapped on the base, a first locking piece arranged on the mounting frame and used for limiting the rotation of a dial, and an unlocking piece arranged on the base and matched with the first locking piece to unlock the dial, an annular groove is formed in the side, close to the dial, of the mounting frame, a first gear ring is arranged on the inner wall of the annular groove, a second gear ring extending towards the annular groove is arranged on the side, opposite to the mounting frame, of the dial, and limiting teeth are slidably arranged on the inner side of the dial. Compared with the prior art, the dumbbell has the advantages that abrasion caused by abnormal use is avoided, the service life of the dumbbell is prolonged, and the maintenance cost is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to body -building equipment technical field especially, a dumbbell weight block's locking structure is provided. BACKGROUND

[0002] Dumbbell is a kind of historical long-standing and widely used fitness tool, with its simple, flexible and efficient characteristics, is loved by fitness enthusiasts. Whether it is home fitness, gym training or rehabilitation training, dumbbell can provide significant training effect. The weight of traditional dumbbell is fixed, cannot satisfy the training of different stages of customer, to solve this problem, some adjustable weight dumbbell appears in the market.

[0003] Such as patent announcement number CN216909036U's China utility model patent "adjustable weight dumbbell", when dumbbell is placed on dumbbell seat, the top sheet on the dumbbell seat is up to lock block and makes lock block guide groove and rotating guide groove coincide, when rotating dial, unlocking piece can smoothly pass, according to user demand, randomly rotating handle drives dial rotation and the connection of different gravity weight block, realize adjustable weight, when dumbbell is separated from dumbbell seat, lock block resets, lock block guide groove and rotating guide groove are misaligned, lock block blocks rotating unlocking piece and prevents dial rotation, at this time, dumbbell is in training state.

[0004] In the above scheme, when dumbbell is not used and placed on dumbbell seat, dial is in complete unlocking state, if there is a child at home, child can easily rotate handle and drive dumbbell shaft to rotate, which can cause wear and tear over a long period of time, resulting in shortening the service life of dumbbell, and increasing maintenance cost. UTILITY MODEL CONTENTS

[0005] The utility model is directed to the problem that when dumbbell is not used and placed on dumbbell seat, dial is in complete unlocking state, if there is a child at home, child can easily rotate handle and drive dumbbell shaft to rotate, causing wear and tear, the technical problem to be solved by the utility model is to provide a dumbbell weight block's locking structure to solve the above problems.

[0006] The utility model discloses a technical scheme that solves the above technical problem is adopted: including base, the counterweight of a plurality of counterweight of being set on base, the mounting frame of two ends of leaning on base, connecting shaft subassembly and fixedly be equipped with a plurality of connecting pieces of mounting frame can be connected with the counterweight and lift the counterweight, connecting shaft subassembly passes through mounting frame and a plurality of connecting pieces and can rotate relative to mounting frame and a plurality of connecting pieces, the part of connecting shaft subassembly in each connecting piece has a plurality of convex parts with spacing along its circumferential distribution, the resettable spacer of being connected with the counterweight when the convex part extrusion and being separated from the counterweight when the convex part is separated is slidably equipped in the connecting piece and part is stretched out the connecting piece, which is characterized in that: mounting frame one end rotationally is equipped with the dial of fixed connection with connecting shaft subassembly, the first locking piece of being equipped with the first locking piece of restricting the rotation of dial on mounting frame, the unlocking sheet of being equipped with the unlocking sheet of unlocking dial with the first locking piece cooperation on base, the side of mounting frame close to dial is equipped with annular groove, the first ring gear of being equipped with the first ring gear on annular groove inner wall, the second ring gear of being equipped with the second ring gear of extending towards annular groove on the opposite side of dial, the limit tooth of being slidably equipped with the limit tooth in the inside of dial, when the limit tooth transverse sliding is actuated, the limit tooth one side is engaged with the first ring gear, and the other side is engaged with the second ring gear, and the limit tooth of dial is limited.

[0007] The further preferred scheme of the utility model is that: the inner diameter of the first ring gear and the second ring gear is equal.

[0008] The further preferred scheme of the utility model is that: the limit tooth includes an arc-shaped pawl and a connecting column integrally formed with the arc-shaped pawl, and the end of the connecting column away from the arc-shaped pawl extends from the inside of the dial to the outside of the dial to form a actuating part.

[0009] The further preferred scheme of the utility model is that: the connecting column is L-shaped, the dial is provided with a through hole through which the connecting column passes, the dial is provided with a limiting block, the limiting block is provided with a strip-shaped hole arranged in the vertical direction of the dial, and the actuating part of the connecting column passes through the strip-shaped hole and can slide along the strip-shaped hole.

[0010] The further preferred scheme of the utility model is that: the diameter of the arc-shaped pawl is equal to the inner diameter of the first inner ring gear and the inner diameter of the second inner ring gear.

[0011] The further preferred scheme of the utility model is that: the mounting frame includes an inner connecting seat, an outer connecting seat and a horizontal rod fixed at the top of the inner connecting seat and the outer connecting seat respectively, the connecting pieces are fixed on the horizontal rod, and the dial is rotationally connected with the inner connecting seat.

[0012] The further preferred scheme of the utility model is that: the annular groove is located on the inner connecting seat.

[0013] A further preferred embodiment of this utility model is as follows: the inner connecting seat has an annular groove on the side near the dial, the annular groove has a limiting groove, and the groove walls on both sides of the limiting groove have notches. The inner connecting seat has an insertion groove corresponding to the unlocking piece and communicating with the limiting groove. The side of the dial opposite to the inner connecting seat has a limiting piece that is arranged circumferentially along the dial and extends into the limiting groove. The first locking member is slidably disposed in the limiting groove. The first locking member has an arc-shaped channel. When the mounting bracket and the counterweight are placed in the slot, the unlocking piece presses the first locking member upward and slides it so that the arc-shaped channel corresponds to the groove openings on both sides of the limiting groove. At this time, the limiting piece can pass through the groove opening and the arc-shaped channel. When the mounting seat is detached from the base, the unlocking piece is detached from the first locking member, and the arc-shaped channel is misaligned with the notch. At this time, the limiting piece is blocked on one side of the notch.

[0014] A further preferred embodiment of this utility model is as follows: the first locking member includes a sliding block and a return spring, the arc-shaped channel is located on the sliding block, one end of the return spring abuts against the sliding block, and the other end abuts against the groove wall on the side away from the insertion groove.

[0015] A further preferred embodiment of this utility model is that the width of the groove at the connection between the insertion groove and the limiting groove is less than the width of the contact end between the sliding block and the unlocking piece.

[0016] Compared with the prior art, this utility model has the following advantages: By setting a first locking component, when the dumbbell is removed from the base, the first locking component automatically locks the dial, preventing accidental contact during use that could cause the counterweight to fall off unexpectedly; and based on the first locking component, a first toothed ring is set on the mounting bracket, and a second toothed ring and a limiting tooth are set on the dial. The limiting tooth engages with both the first toothed ring of the mounting bracket and the second toothed ring of the dial, thus limiting the dial when the dumbbell is placed on the base. This restricts the protrusion on the connecting shaft assembly from engaging with the connecting component and connecting the connecting component to the counterweight, preventing children from rotating the handle and causing the dumbbell shaft to rotate when unattended. This avoids wear caused by abnormal use, increases the service life of the dumbbell, and reduces maintenance costs. Attached Figure Description

[0017] The present invention will be further described in detail below with reference to the accompanying drawings and preferred embodiments. However, those skilled in the art will understand that these drawings are drawn only for the purpose of explaining the preferred embodiments and therefore should not be regarded as a limitation on the scope of the present invention. In addition, unless otherwise specified, the drawings are only schematic representations of the composition or structure of the described objects and may contain exaggerated displays, and the drawings are not necessarily drawn to scale.

[0018] Figure 1 This is a three-dimensional structural diagram of a preferred embodiment of the present invention;

[0019] Figure 2 This is a top view of a preferred embodiment of the present invention;

[0020] Figure 3 This is a preferred embodiment of the present utility model. Figure 2 Sectional view at point AA;

[0021] Figure 4 This is a preferred embodiment of the present utility model. Figure 3 A magnified view of a section at point B in the middle;

[0022] Figure 5 This is one of the exploded views of a preferred embodiment of the present invention;

[0023] Figure 6 This is a second exploded view of a preferred embodiment of the present invention;

[0024] Figure 7 This is the third exploded view of the preferred embodiment of this utility model;

[0025] Figure 8 This is a three-dimensional structural diagram of the limiting tooth in a preferred embodiment of the present invention.

[0026] In the diagram: 1. Base; 11. Slot; 12. Unlocking plate; 2. Counterweight; 21. Slot; 22. Connecting hole; 3. Mounting bracket; 31. Inner connecting seat; 311. Annular groove; 312. First gear ring; 313. Limiting groove; 314. Insertion groove; 315. Notch; 32. Outer connecting seat; 33. Crossbar; 4. Connecting shaft assembly; 41. Protrusion; 42. Dumbbell shaft; 43. Cam; 44. Connecting cylinder; 45. Bushing; 5. Connecting piece; 51. Housing; 52. 1. Shaft hole; 52. Resettable limiting component; 521. Push block; 522. Sliding block; 523. Compression spring; 524. Push rod; 525. Through hole; 6. Dial; 61. Second gear ring; 62. Limiting tooth; 621. Arc-shaped locking tooth; 622. Connecting post; 623. Actuating part; 63. Limiting block; 631. Strip hole; 64. Limiting piece; 65. Through hole; 7. First locking component; 71. Slider; 72. Return spring; 73. Arc-shaped channel; 8. Handle. Detailed Implementation

[0027] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Those skilled in the art will appreciate that these descriptions are merely descriptive and exemplary and should not be construed as limiting the scope of protection of the present invention.

[0028] It should be noted that similar labels in the following figures indicate similar items; therefore, once an item is defined in one figure, it may not be further defined and explained in subsequent figures.

[0029] This embodiment mainly describes a locking structure for a dumbbell counterweight, as detailed below:

[0030] like Figures 1 to 5As shown, a locking structure for dumbbell counterweights includes a base 1, several counterweights 2, a mounting bracket 3, a connecting shaft assembly 4, and connectors 5. The base 1 is used to fix the counterweights 2 and the mounting bracket 3 to ensure the stability of the structure. The base 1 is provided with slots 11, which correspond one-to-one with the counterweights 2. The counterweights 2 are locked onto the base 1. When the dumbbell is not in use, the two ends of the mounting bracket 3 rest on the base 1. The connectors 5 are fixedly mounted on the mounting bracket 3. The connectors 5 are used to connect with the counterweights 2 to lift and fix the counterweights 2 onto the mounting bracket 3. The number of connectors 5 is equal to the number of counterweights 2. The connecting shaft assembly 4 passes through the mounting bracket 3 and the several connectors 5 and can be positioned relative to the mounting bracket 3 and the several connectors 5. When the connecting member 5 rotates, the portion of the connecting shaft assembly 4 located within each connecting member 5 has several spaced protrusions 41 distributed circumferentially. The lengths and spacing of each protrusion 41 along the circumferential direction are different, and the number of protrusions 41 within adjacent connecting members 5 varies. A resettable limiting member 52 is slidably provided within the connecting member 5. When the connecting shaft assembly 4 rotates until the protrusions 41 press against the resettable limiting member 52, a portion of the resettable limiting member 52 extends out of the connecting member 5 and connects with the counterweight 2. At this time, the counterweight 2 is fixed to the connecting member 5. When the connecting member 5 rotates until the protrusions 41 disengage from the resettable limiting member 52, the resettable limiting member 52 disengages from the counterweight 2 and returns to its initial state. By rotating the connecting shaft assembly 4, the protrusions 41 on the connecting shaft assembly 4 engage with the resettable limiting members 52 within different connecting members 5, allowing connection of different numbers of counterweights 2 to adjust the weight of the dumbbell. To improve the weight adjustment effect, the weights of the counterweights 2 are not equal. One end of the mounting bracket 3 is rotatably equipped with a dial 6 that is fixedly connected to the connecting shaft assembly 4. The dial 6 has scales representing dumbbell weight adjustment. When a certain scale is aligned with a reference point on the mounting bracket 3, it indicates the dumbbell weight setting. The mounting bracket 3 has a first locking element 7 that restricts the rotation of the dial 6, and the base 1 has an unlocking piece 12 that cooperates with the first locking element 7 to unlock the dial 6. When the dumbbell is placed on the base 1, the dial 6 is in the unlocked state. As needed, the dial 6 can be rotated to the corresponding setting on the dial 6 via the connecting shaft assembly 4 to obtain the desired weight. The mounting bracket 3 has an annular groove 311 on the side near the dial 6. A first toothed ring 312 is provided on the inner wall of the annular groove 311. A second toothed ring 61 extending into the annular groove 311 is provided on the side of the dial 6 opposite to the mounting bracket 3. A limiting tooth 62 is provided on the inner side of the dial 6. When the limiting tooth 62 is moved to slide laterally, one side of the limiting tooth 62 engages with the first toothed ring 312, and the other side engages with the second toothed ring 61, thus limiting the dial 6.Based on the first locking component 7, the mounting bracket 3 is equipped with a first toothed ring 312, and the dial 6 is equipped with a second toothed ring 61 and a limiting tooth 62. When the dumbbell is placed on the base 1, the dial 6 can be limited, thus preventing it from connecting with the counterweight 2. This prevents children from rotating the handle 8 and causing the dumbbell shaft 42 to rotate when unattended, avoiding wear caused by abnormal use, improving the service life of the dumbbell, and reducing maintenance costs.

[0031] Specifically, in order to ensure that the limiting tooth 62 can simultaneously mesh with the first gear ring 312 and the second gear ring 61, to ensure the limiting accuracy of the dial 6 and improve the accuracy of the counterweight adjustment, the inner diameters of the first gear ring 312 and the second gear ring 61 are designed to be equal.

[0032] Specifically, the limiting tooth 62 includes an arc-shaped locking tooth 621 and a connecting post 622 integrally formed with the arc-shaped locking tooth 621. The end of the connecting post 622 away from the arc-shaped locking tooth 621 extends from the inside of the dial 6 to the outside of the dial 6 to form a toggle part 623. The design of the arc-shaped locking tooth 621 makes it highly compatible with the first gear ring 312 and the second gear ring 61, further improving the limiting effect on the dial 6. The design of the toggle part 623 makes it convenient for users to operate the limiting tooth 62 to realize the limiting and unlocking of the dial 6, improving the convenience of use.

[0033] Specifically, the connecting post 622 is L-shaped, and the dial 6 has a through hole 65 for the connecting post 622 to pass through. The dial 6 has a limiting block 63, and the limiting block 63 has a strip-shaped hole 631 arranged perpendicular to the dial 6. The actuating part 623 of the connecting post 622 passes through the strip-shaped hole 631 and can slide along the strip-shaped hole 631. The design of the L-shaped connecting post 622 and the strip-shaped hole 631 restricts the movement direction of the limiting tooth 62, so that it can only slide along the strip-shaped hole 631. In order to improve the stability of the limiting tooth 62, elastic protrusions are provided on both sides of the strip-shaped hole 631. When the limiting tooth 62 engages with the first gear ring 312 and the second gear ring 61 at the same time, the elastic protrusions abut against both sides of the end of the actuating part 623.

[0034] Specifically, to ensure that the limiting tooth 62 can accurately mesh with the first gear ring 312 and the second gear ring 61, the diameter of the arc-shaped retaining tooth 621 is equal to the inner diameter of the first gear ring 312 and the inner diameter of the second gear ring 61. This design further improves the reliability of the dial 6's limiting function, makes the counterweight adjustment more precise, and ensures that the limiting tooth 62 can stably mesh in different positions.

[0035] Specifically, the mounting bracket 3 includes an inner connecting seat 31, an outer connecting seat 32, and a crossbar 33 with both ends fixed to the tops of the inner connecting seat 31 and the outer connecting seat 32, respectively. The connector 5 is fixed to the crossbar 33, the dial 6 is rotatably connected to the inner connecting seat 31, and the annular groove 311 is located on the inner connecting seat 31. The combination of the inner connecting seat 31, the outer connecting seat 32, and the crossbar 33 forms a stable connecting bracket structure, providing a reliable mounting base for other components and ensuring the stability of the entire locking structure.

[0036] Specifically, the inner connecting seat 31 has an annular groove on the side opposite to the dial 6, and a limiting groove 313 is provided in the annular groove. Notches 315 are provided on the groove walls on both sides of the limiting groove 313. The inner connecting seat 31 has an insertion groove 314 corresponding to the unlocking piece 12 and communicating with the limiting groove 313. The dial 6 has a limiting piece 64 on the side opposite to the inner connecting seat 31, arranged circumferentially around the dial 6 and extending into the limiting groove 313. The first locking member 7 is slidably disposed within the limiting groove 313. The stop 7 has an arc-shaped channel 73. When the mounting bracket 3 and the counterweight 2 are placed in the slot 11, the unlocking piece 12 pushes the first locking piece 7 upward to slide it so that the arc-shaped channel 73 aligns with the slots on both sides of the limiting slot 313. The limiting piece 64 can then pass smoothly through the slots and the arc-shaped channel 73. When the mounting bracket 3 detaches from the base 1, the unlocking piece 12 disengages from the first locking piece 7, and the arc-shaped channel 73 is misaligned with the notch 315. At this time, the limiting piece 64 is blocked on one side of the notch 315, thus locking the dial 6. The locking and unlocking functions of the dial 6 are achieved through the cooperation of the unlocking piece 12 and the first locking piece 7. This design ensures that the dial 6 will not rotate accidentally when the dumbbell is detached from the base 1, improving safety and stability. Simultaneously, the misalignment design of the arc-shaped channel 73 and the notch 315 further enhances the reliability of the locking, preventing the dial 6 from being accidentally unlocked by external force while locked.

[0037] Specifically, the first locking element 7 includes a slider 71 and a return spring 72. The arc-shaped channel 73 is located on the slider 71, and one end of the return spring 72 abuts against the slider 71, while the other end abuts against the groove wall on the side away from the insertion groove 314. The design of the return spring 72 ensures that the first locking element 7 automatically resets after disengaging from the unlocking piece 12, improving the reliability and stability of the locking mechanism. This ensures that the dial 6 remains locked during dumbbell use, preventing accidental rotation that could cause the counterweight 2 to fall off and lead to safety issues.

[0038] Specifically, the width of the groove where the insertion groove 314 connects with the limiting groove 313 is smaller than the width of the contact end between the slider 71 and the unlocking piece 12. This design restricts the slider 71 to move only within the limiting groove 313, preventing the slider 71 from sliding excessively when the unlocking piece 12 disengages, further improving the stability and reliability of the first locking member 7, and ensuring that the dial 6 will not be accidentally unlocked due to external force when locked.

[0039] Specifically, the connector 5 includes a housing 51 and a resettable limiting member 52 located inside the housing 51. The housing 51 has an installation cavity inside, and the resettable limiting member 52 is located inside the installation cavity. The resettable limiting member 52 includes a push block 521, a sliding block 522, and a compression spring 523. The push block 521 is located below the connecting shaft assembly 4 and can move vertically downward along the installation cavity. The sliding block 522 is located below the push block 521, and the lower end face of the push block 521 is a first inclined surface. The upper end face of the sliding block 522 is a second inclined surface that cooperates with the first inclined surface. A push rod 524 is provided on one side of the sliding block 522. The reset compression spring 523 is sleeved on the push rod 524. One end of the reset compression spring 523 abuts against the inner side of the counterweight side wall, and the other end abuts against the side wall of the sliding block 522 near the push rod 524. The housing 51 is provided with a through hole 525 corresponding to the push rod 524 for the connecting block to pass through. Under normal conditions, the first inclined surface is attached to the upper side of the second inclined surface. To facilitate the connection of the counterweight 2, the counterweight 2 has a slot 21 for the connector 5 to be inserted from top to bottom. The slot 21 has a connecting hole 22 corresponding to the push rod 524 on its wall. When the dumbbell is not in use, the connector 5 is inserted into the slot 21. When the connecting shaft assembly 4 is rotated to press the protrusion 41 against the push block 521, the push block 521 slides down to press the sliding block 522. At this time, the push rod 524 passes through the through hole 525 and is inserted into the connecting hole 22, thus connecting the connector 5 to the counterweight 2. The housing 51 above the push block 521 has a shaft hole 511 for the connecting shaft assembly 4 to pass through, and the connecting shaft assembly 4 is connected to the connector 5 through the shaft hole 511.

[0040] Specifically, the aforementioned connecting shaft assembly 4 includes a dumbbell shaft 42 and several cams 43 fitted on the dumbbell shaft 42. The protruding part on the cam 43 is the aforementioned protrusion 41. The cam 43 is rotatably disposed in the shaft hole 511 and adjacent cams 43 are connected by a key. The dial 6 and the mounting bracket 3 are both fitted on the dumbbell shaft 42. A connecting sleeve 44 fitted on the dumbbell shaft 42 is provided between the dial 6 and the dumbbell shaft 42. The dial 6, the connecting sleeve 44 and the dumbbell shaft 42 are fixed by a fixing pin. A bushing 45 is fitted between the inner connecting seat 31 and the dumbbell shaft 42. One end of the bushing 45 is keyed to the connecting sleeve 44, and the other end is keyed to the cam 43 near the inner seat. This design allows several cams 43 on the dumbbell shaft 42 to rotate when either the dial 6 or the dumbbell shaft 42 rotates. The protrusions 41 on the cams 43 cooperate with the resettable limiting member 52 in the connector 5, thereby connecting with the counterweight 2 to achieve counterweight adjustment.

[0041] Specifically, a handle 8 is fixedly provided at one end of the dumbbell near the dial 6. The handle 8 is located on the side near the dial 6 to facilitate the adjustment of the dumbbell's speed.

[0042] In the description of this utility model, it should be noted that the terms "upper", "lower", "front", "rear", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship that the utility model product is usually placed in during use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0043] The locking structure of a dumbbell counterweight provided by this utility model has been described in detail above. Specific examples have been used to illustrate the principle and implementation of this utility model. The description of the above embodiments is only for the purpose of helping to understand this utility model and its core ideas. It should be noted that for those skilled in the art, several improvements and modifications can be made to this utility model without departing from the principle of this utility model, and these improvements and modifications also fall within the protection scope of the claims of this utility model.

Claims

1. A locking structure for a dumbbell counterweight, comprising a base, a plurality of counterweights mounted on the base, a mounting bracket with both ends resting on the base, a connecting shaft assembly, and a plurality of connecting members fixed on the mounting bracket and capable of connecting with the counterweights to lift the counterweights. The connecting shaft assembly passes through the mounting bracket and the plurality of connecting members and is rotatable relative to the mounting bracket and the plurality of connecting members. The portion of the connecting shaft assembly located within each connecting member has a plurality of protrusions distributed circumferentially thereon, with a spacing between the protrusions. A resettable limiting member is slidably provided within the connecting member, which extends out of the connecting member and connects with the counterweight when pressed by the protrusions, and resets and separates from the counterweight when the protrusions disengage. The structure is characterized in that: One end of the mounting bracket is rotatably provided with a dial fixedly connected to the connecting shaft assembly. The mounting bracket is provided with a first locking member that restricts the rotation of the dial. The base is provided with an unlocking piece that cooperates with the first locking member to unlock the dial. The mounting bracket is provided with an annular groove on the side near the dial. A first toothed ring is provided on the inner wall of the annular groove. A second toothed ring extending into the annular groove is provided on the side of the dial opposite to the mounting bracket. A limiting tooth is slidably provided on the inner side of the dial. When the limiting tooth is moved to slide laterally, one side of the limiting tooth engages with the first toothed ring, and the other side engages with the second toothed ring, thus limiting the dial.

2. The locking structure for a dumbbell counterweight according to claim 1, characterized in that... The inner diameters of the first gear ring and the second gear ring are equal.

3. The locking structure for a dumbbell counterweight according to claim 1, characterized in that... The limiting tooth includes an arc-shaped locking tooth and a connecting post integrally formed with the arc-shaped locking tooth. The end of the connecting post away from the arc-shaped locking tooth extends from the inside of the dial to the outside of the dial to form a toggle part.

4. The locking structure for a dumbbell counterweight according to claim 3, characterized in that... The connecting post is L-shaped, and the dial has a through hole for the connecting post to pass through. The dial has a limiting block, and the limiting block has a strip hole arranged perpendicular to the dial. The actuating part of the connecting post passes through the strip hole and can slide along the strip hole.

5. The locking structure for a dumbbell counterweight according to claim 3, characterized in that... The diameter of the arc-shaped locking teeth is equal to the inner diameter of the first internal gear ring and equal to the inner diameter of the second internal gear ring.

6. The locking structure for a dumbbell counterweight according to claim 1, characterized in that... The mounting bracket includes an inner connecting seat, an outer connecting seat, and a crossbar with both ends fixed to the top of the inner connecting seat and the top of the outer connecting seat, respectively. The connector is fixed on the crossbar, and the dial is rotatably connected to the inner connecting seat.

7. The locking structure for a dumbbell counterweight according to claim 6, characterized in that... The annular groove is located on the inner connecting seat.

8. The locking structure for a dumbbell counterweight according to claim 7, characterized in that... The inner connecting seat has an annular groove on the side near the dial, and a limiting groove is provided in the annular groove. Notches are provided on the groove walls on both sides of the limiting groove. The inner connecting seat has an insertion groove corresponding to the unlocking piece and communicating with the limiting groove. The dial is provided with a limiting piece on the side opposite to the inner connecting seat, which is arranged circumferentially along the dial and extends into the limiting groove. The first locking member is slidably disposed in the limiting groove. The first locking member has an arc-shaped channel. When the mounting bracket and the counterweight are placed in the slot, the unlocking piece presses the first locking member to slide upward so that the arc-shaped channel corresponds to the groove openings on both sides of the limiting groove. The limiting piece can pass through the groove opening and the arc-shaped channel. When the mounting bracket is detached from the base, the unlocking piece is detached from the first locking member, and the arc-shaped channel is misaligned with the notch. At this time, the limiting piece is blocked on one side of the notch.

9. The locking structure for a dumbbell counterweight according to claim 8, characterized in that... The first locking element includes a sliding block and a return spring. The arc-shaped channel is located on the sliding block. One end of the return spring abuts against the sliding block, and the other end abuts against the groove wall on the side away from the insertion groove.

10. The locking structure for a dumbbell counterweight according to claim 8, characterized in that... The width of the groove where the insertion groove connects with the limiting groove is less than the width of the contact end between the sliding block and the unlocking piece.

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