Weight-adjustable Dumbbell

Description

CROSS-REFERENCE TO RELATED APPLICATIONS

The present application claims the benefit of Chinese Patent Application No. 202422365491.1 filed on Sep. 27, 2024, the contents of which are hereby incorporated by reference.

TECHNICAL FIELD

The present application belongs to a technical field of gym equipment, in particular to a weight-adjustable dumbbell.

BACKGROUND

Dumbbells are a kind of common gym equipment for building muscle strength and endurance. They usually comprise a pair of handhold weights and metal spheres on both ends with a short rod connected in the middle. Dumbbells can be applied in multiple exercises, including but not limited, weightlifting, dumbbell curl, dumbbell press, deep squat and so on. It depends on personal training goal and fitness level to choose a proper weight when using dumbbells for exercise.

Currently, there are dumbbells with specific weights on the market as well as weight-adjustable dumbbells. It requires multiple sets of equipment when using dumbbells with specific weights to satisfy different needs of the gym crowd, which requires high cost and large occupation. A weight-adjustable dumbbell generally include a center shaft, several dumbbell pieces connected in series on both ends of the center shaft and a locking screw threadedly connected with both ends of the center shaft. Specifically, the dumbbell's weight adjustment is completed by adding or reducing the dumbbell pieces on the center shaft, rotating to lock the locking screw to adjust its position on the center shaft, and abutting the dumbbell pieces tightly.

When changing the weight of the dumbbell, it is necessary to remove the locking screw each time, install the dumbbell pieces and tighten the locking screw, which makes the installing process tedious and time-consuming. A weight-adjustable dumbbell realizing quick replacement of dumbbell pieces is desired.

SUMMARY

In order to overcome the deficiencies in prior art, the present application provides a weight-adjustable dumbbell, which can quickly replace the dumbbell pieces and save the adjustment time of users.

The technical solution to solve the technical problems adopted by the present application is:

A weight-adjustable dumbbell, comprises a dumbbell frame, a plurality of hanging piece components and dumbbell pieces matching with the hanging piece components. A rotating rod is provided on a middle position of the dumbbell frame, and the plurality of hanging piece components are arranged symmetrically on both ends of the dumbbell frame. Several hanging piece components on the same end of the dumbbell frame are arranged at intervals and in linkage connection with each other. The hanging piece components close to the middle of the dumbbell frame are in linkage connection with the rotating rod. Each of the hanging piece component includes a gear shaft and a limiting structure. The rotating rod is provided with clamping blocks on its both ends. One side of the gear shaft is provided with slots, which cooperate with the clamping blocks to realize the interaction between the rotating rod and the gear shaft. The limiting structure cooperates with the gear shaft to limit the movement of the dumbbell piece.

Further, the limiting structure comprises a driven gear, a first shell and a second shell. A cavity is formed after the first shell and the second shell are connected. The gear shaft and the driven gear are arranged inside the cavity, and the driven gear is engaged with the gear shaft. The limiting structure includes protrusion blocks and plug-in slots, wherein the protrusion blocks are arranged in the inner side of the first shell, and the plug-in slots are arranged on one side of the driven gear facing to the first shell. The driven gear rotates relatively to the first shell to enable the insertion or separation between the plug-in slots and the protrusion blocks. One side of the driven gear close to the second shell is provided with a limiting column and an elastic element is arranged on the outer periphery of the limiting column. The second shell is provided with second through-holes for the limiting columns to pass through. The dumbbell piece is provided with limiting holes matching with the limiting columns.

Further, the plug-in slot is provided with a first guide slope and the protrusion block is provided with a second guide slope matching with the first guide slope.

Further, the middle of the dumbbell piece is provided with a first through-hole and a gap is arranged on one side of the dumbbell piece. The gap is communicated with the first through-hole and a chute is arranged on both sides of the gap. The hanging piece component is arranged in the chute and slides along the gap to an external environment of the dumbbell piece.

Further, the dumbbell frame comprises a fixing frame and a center shaft, wherein the fixing frame includes a front baffle, a rear baffle and a connecting plate. The hanging piece component is arranged out of the center shaft and between the front baffle and the rear baffle. The rear baffle is fixedly connected with the center shaft and both ends of the connecting plate are respectively connected with the front baffle and the rear baffle.

Further, one side of the connecting plate close to the front baffle is provided with an identification block, and the front baffle is provided with a fixing hole matching with the identification block. The identification block is inserted into the fixing hole.

Further, the dumbbell frame further comprises a gear assembly, which is arranged on both ends of the rotating rod and forms a linkage connection with the rotating rod. One side of the front baffle close to the gear assembly is provided with a positioning slot, wherein a first spring and a positioning bead are arranged in the positioning slot. Multiple positioning holes are arranged at intervals in a circumferential direction on one side of the gear assembly close to the front baffle, wherein the positioning bead penetrates out along the positioning hole.

Further, the dumbbell further comprises a base. A locking groove is arranged on the bottom of the front baffle, and a locking block is arranged inside the locking groove. The locking block is connected with the top of the locking groove through the second spring. The locking block is provided with an avoidance groove in its middle part. A plurality of fixing blocks are arranged at intervals in a circumferential direction on one side of the gear assembly facing to the front baffle, and a protrusion structure matching with the locking block is arranged on the base.

Further, one side of the gear assembly away from the front baffle is evenly divided into several dials. The amount of the positioning holes is same as the amount of the dials, and the amount of the fixing blocks is same as the amount of the dials.

Further, an anti-slip sleeve is arranged on the outer periphery of the rotating rod and the anti-slip sleeve is provided with an anti-slip pattern on its outer periphery.

The beneficial effects of the present application is:

The present application provides a weight-adjustable dumbbell, which limits the dumbbell pieces by setting hanging piece components. Users only need to rotate the rotating rod to realize the quick replacement of the dumbbell pieces, saving their time for adjusting weights of the dumbbell.

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1 is a schematic diagram of the overall assembly of the present application;

FIG. 2 is a schematic diagram of the dumbbell piece in the present application;

FIG. 3 is a schematic diagram of the dumbbell piece in the present application from another angel;

FIG. 4 is a schematic diagram of the dumbbell frame in the present application;

FIG. 5 is an explosive diagram of the hanging piece component in the present application;

FIG. 6 is an explosive diagram of the hanging piece component in the present application from another angel;

FIG. 7 is a schematic diagram of the rotating rod in the present application;

FIG. 8 is an explosive diagram of the four groups of hanging piece components and four groups of dumbbell pieces in the present application;

FIG. 9 is a schematic diagram of the structure of the driven gears of the four groups of hanging piece components in the present application;

FIG. 10 is an explosive diagram of a part of the dumbbell frame in the present application;

FIG. 11 is a schematic diagram of the front baffle and the gear assembly in the present application;

FIG. 12 is a schematic diagram of the gear assembly in the present application;

FIG. 13 is a schematic diagram of the base in the present application;

FIG. 14 is a schematic diagram of the overall structure of the present application;

FIG. 15 is a cross-sectional view taken along line A-A in FIG. 14;

NOTE OF THE REFERENCE SIGNS

• • 1—base; 11—protrusion structure; 12—fixing groove; 13—positioning protrusion;
  • 2—center shaft; 21—rotating rod; 211—anti-slip sleeve; 212—clamping block;
  • 3—dumbbell piece; 31—first through—hole; 32—gap; 33—chute; 34—limiting hole; 35—groove; 36—first dumbbell piece; 37—second dumbbell piece; 38—third dumbbell piece; 39—fourth dumbbell piece;
  • 4—hanging piece component; 41—gear shaft; 411—slot; 42—driven gear; 421—limiting column; 422—elastic element; 423—plug—in slot; 43—first shell; 431—protrusion block; 44—second shell; 441—second through—hole; 45—first hanging piece component; 451—first driven gear; 452—first plug—in slot; 46—second hanging piece component; 461—second driven gear; 462—second plug—in slot; 47—third hanging piece component; 471—third driven gear; 472—third plug—in slot; 48—fourth hanging piece component; 481—fourth driven gear; 482—fourth plug—in slot;
  • 5—fixing frame; 51—front baffle; 511—fixing hole; 512—positioning slot; 513—first spring; 514—positioning bead; 515—locking groove; 516—locking block; 517—avoidance groove; 518—second spring; 52—rear baffle; 53—connecting plate; 531—identification block;
  • 6—gear assembly; 61—positioning hole; 62—dial; 63—fixing block.

DESCRIPTION OF EMBODIMENTS

The following will clearly and completely describe the concept, specific structure and technical effects of the present application in combination with the embodiments and figures, so as to fully understand the purpose, characteristics and effects of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all of them. Based on the embodiments of the present application, other embodiments obtained by those of skills in this field without creative work are all within the scope of protection of the present application. In addition, all the linkage/connection relationships involved in the present application do not refer to the direct connection of components, but refer to the formation of a better connection structure by adding or reducing connection accessories according to the specific implementation situation. The various technical features in the present application can be combined interchangeably without conflicting with each other.

The present application provides a weight-adjustable dumbbell, which limits the dumbbell pieces by setting hanging piece components. Users only need to rotate the rotating rod to realize the quick replacement of the dumbbell pieces, saving their time for adjusting weights of the dumbbell.

Referring to FIGS. 1 to 15, the present application provides a weight-adjustable dumbbell, comprising a dumbbell frame, a base 1, dumbbell pieces 3 and hanging piece components 4, wherein the dumbbell pieces 3 match with the hanging piece components 4. A rotating rod 21 is provided on a middle position of the dumbbell frame, and the hanging piece components 4 are set to have a plurality of groups. Multiple groups of the hanging piece components 4 are arranged at intervals and in linkage connection with each other. Multiple groups of the hanging piece components 4 are arranged symmetrically on both ends of the dumbbell frame. The hanging piece components 4 close to the middle of the dumbbell frame are in linkage connection with the rotating rod. Dumbbell pieces 3 with same amount of the hanging piece components 4 are arranged on the base 1.

The middle of the dumbbell piece 3 is provided with a first through-hole 31 and a gap 32 is arranged on the top of the dumbbell piece 3. The gap 32 is communicated with the first through-hole 31 and a chute 33 is arranged on both sides of the gap 32. The hanging piece component 4 is arranged in the chute 33 and slides along the gap 32 to an external environment of the dumbbell piece 3. The hanging piece component 4 is provided with a limiting structure for limiting the movement of the dumbbell piece 3.

Referring to FIGS. 1 to 7, the hanging piece component 4 includes a gear shaft 41 and slots 411 are provided on one side of the gear shaft 41. The rotating rod 21 is provided with clamping blocks 212 on its both ends. The clamping blocks 212 cooperate with the slots 411 to realize the interaction between the rotating rod 21 and the gear shaft 41. The gear shaft 41 between two adjacent hanging piece components 4 cooperates with the slots 411 through the clamping blocks 212 to realize the linkage connection.

Further, the hanging piece component 4 further comprises a driven gear 42, a first shell 43 and a second shell 44. A cavity is formed after the first shell 43 and the second shell 44 are connected. The gear shaft 41 and the driven gear 42 are arranged inside the cavity, and the driven gear 42 is engaged with the gear shaft 41.

In this embodiment, the limiting structure cooperates with the gear shaft 41 to limit the movement of the dumbbell piece 3. The limiting structure includes protrusion blocks 431 and plug-in slots 423, wherein the protrusion blocks 431 are arranged in the inner side of the first shell 43, and the plug-in slots 423 are arranged on one side of the driven gear 42 facing to the first shell 43. The driven gear 42 rotates relatively to the first shell 43 to enable the insertion or separation between the plug-in slots 423 and the protrusion blocks 431. One side of the driven gear 42 close to the second shell 44 is provided with a limiting column 421 and an elastic element 422 is arranged on the outer periphery of the limiting column 421. The second shell 44 is provided with second through-holes 441 for the limiting columns 421 to pass through. The dumbbell piece 3 is provided with limiting holes 34 matching with the limiting columns 421.

It should be illustrated that, in an initial state, the protrusion blocks 431 are inserted into the plug-in slots 423. When a user is holding the rotating rod 21 to lift, the hanging piece component 4 moves along the rotating rod 21 and slides to the external environment of the dumbbell piece 3 along the gap 32. The dumbbell piece 3 remains on the base 1 without moving together with the rotating rod 21. When the user twists the rotating rod 21 to move, the gear shaft 41 moves synchronously to drive the driven gear 42 to rotate. The plug-in slots 423 on the gear shaft 42 gradually separates from the protrusion block 431 and the protrusion blocks 431 forms a horizontal abutting force to the gear shaft 42. The gear shaft 42 moves to one side away from the protrusion blocks 431 and the limiting columns 421 passes through the second through-holes 441 and are eventually inserted into the limiting holes 34. The elastic element 422 is compressed and when the user holds the rotating rod 21 to lift, the hanging piece component 4 moves along the rotating rod 21 together with the dumbbell piece 3.

It can be seen that the user only needs to rotate the rotating rod 21 to realize the weight-adjustable function of the dumbbell, which saves the time for adjustment. When the user needs to change the weight of the dumbbell again, hold the rotating rod 21 to rotate to make the protrusion blocks 431 be inserted into the plug-in slots 423. Under the resetting action of the elastic force of the elastic element 422, a horizontal abutting force is formed to the limiting columns 421. The driven gear 42 moves to one side close to the protrusion blocks 431 and the limiting columns 421 separate from the limiting holes 34, wherein the dumbbell piece 3 is no longer limited by the hanging piece component 4. When the user holds the rotating rod 21 to lift, the dumbbell piece remains on the base 1.

Further, the plug-in slot 423 is provided with a first guide slope and the protrusion block 431 is provided with a second guide slope matching with the first guide slope. When the plug-in slot 423 moves relatively to the protrusion block 431, the first guide slope and the second guide slope play a role of guiding, which is helpful to realize the insertion or separation between the plug-in slot 423 and the protrusion block 431.

It should be noted that the first shell 43 is provided with two protrusion blocks 431 on its inner side and the driven gear 42 is provided with two plug-in slots 423. The two protrusion blocks 431 cooperate with the two plug-in slots 423 respectively, wherein the two protrusion blocks 431 are arranged opposite to each other, and the two plug-in slots 423 are arranged opposite to each other and respectively arranged on an inner ring and an outer ring of the driven gear 42. When the driven gear 42 rotates, the position of the two protrusion blocks 431 moves synchronously with the position of the two plug-in slots 423 to realize insertion or separation.

Referring to FIGS. 8 and 9, this embodiment is described with an example of four groups of hanging piece components 4 and four dumbbell pieces 3. The four groups of hanging piece components are named as a first hanging piece component 45, a second hanging piece component 46, a third hanging piece component 47 and a fourth hanging piece component 48 from the direction of the middle to the end of the center shaft 2. The four dumbbell pieces 3 are named as a first dumbbell piece 36, a second dumbbell piece 37, a third dumbbell piece 38 and a fourth dumbbell piece 39 from the direction of the middle to the end of the center shaft 2.

The first hanging piece component 45 is used for limiting the movement of the first dumbbell piece 36, and the second hanging piece component 46 is used for limiting the movement of the second dumbbell piece 37. The third hanging piece component 47 is used for limiting the movement of the third dumbbell piece 38, and the fourth hanging piece component 48 is used for limiting the movement of the fourth dumbbell piece 39.

In this embodiment, the first dumbbell piece 36, the second dumbbell piece 37 and the third dumbbell piece 38 share the same weight, while the fourth dumbbell piece 39 has a smaller weight. The four groups of hanging piece components 4 and the four dumbbell pieces 3 are combined to form eight levels of different weights.

Supposing that in the initial state, all the protrusion blocks 431 of the hanging piece components 4 are arranged in the plug-in slots 423, all the four groups of hanging piece components 4 no longer limit the movement of the corresponding dumbbell pieces 3. At this time, it is on the first level.

In this embodiment, the protrusion blocks 431 of the four groups of hanging piece components 4 are of the same size. The size of the fourth plug-in slots on the fourth driven gear 481 of the fourth hanging piece component 48 is same as the size of the protrusion block 431. The size of the first plug-in slot 452 on the first driven gear 451 of the first hanging piece component 45 is twice larger than the size of the protrusion block 431. The size of the second plug-in slot 462 on the second driven gear 461 of the second hanging piece component 46 is four times larger than the size of the protrusion block 431. The size of the third plug-in slot 472 on the third driven gear 471 of the third hanging piece component 47 is six times larger than the size of the protrusion block 431.

Correspondingly, when the user rotates once the rotating rod 21, the limiting columns 421 on the fourth driven gear 481 of the fourth hanging piece component 48 are inserted into the limiting holes 34 of the fourth dumbbell piece 39, which limits the fourth dumbbell piece 39 on the dumbbell frame. At this time, it is on the second level.

It should be noted that there are ten fourth plug-in slots 482 of the fourth hanging piece component 48, and the ten fourth plug-in slots 482 are arranged at intervals. When the number of rotation is odd, the fourth dumbbell piece 39 remains on the dumbbell frame.

When the user rotates twice the rotating rod 21, the fourth hanging piece component 48 no longer limits the fourth dumbbell piece 39. The limiting columns 421 on the first driven gear 451 of the first hanging piece component 45 are inserted into the limiting holes 34 of the first dumbbell piece 36, and the first dumbbell piece 36 remains on the dumbbell frame. At this time, it is on the third level.

When the user rotates three times the rotating rod 21, the limiting columns 421 on the fourth driven gear 481 of the fourth hanging piece component 48 are inserted into the limiting holes 34 of the fourth dumbbell piece 39, and the limiting columns 421 on the first driven gear 451 of the first hanging piece component 45 are inserted into the limiting holes 34 of the first dumbbell piece 36. The first dumbbell piece 36 and the fourth dumbbell piece 39 both remain on the dumbbell frame. At this time, it is on the fourth level.

When the user rotates four times the rotating rod 21, the fourth hanging piece component 48 no longer limits the movement of the fourth dumbbell piece 39. The limiting columns 421 on the first driven gear 451 of the first hanging piece component 45 are inserted into the limiting holes 34 of the first dumbbell piece 36, and the limiting columns 421 on the second driven gear 461 of the second hanging piece component 46 are inserted into the limiting holes of the second dumbbell piece 37. The first dumbbell piece 36 and the second dumbbell piece 37 both remain on the dumbbell frame. At this time, it is on the fifth level.

When the user rotates five times the rotating rod 21, the limiting columns 421 on the fourth driven gear 481 of the fourth hanging piece component 48 are inserted into the limiting holes 34 of the fourth dumbbell piece 39, and the limiting columns 421 on the first driven gear 451 of the first hanging piece component 45 are inserted into the limiting holes 34 of the first dumbbell piece 36, while the limiting columns 421 on the second driven gear 461 of the second hanging piece component 46 are inserted into the limiting holes 34 of the second dumbbell piece 37. The first dumbbell piece 36, the second dumbbell piece 37 and the fourth dumbbell piece 39 all remain on the dumbbell frame. At this time, it is on the sixth level.

When the user rotates six times the rotating rod 21, the limiting columns 421 on the first driven gear 451 of the first hanging piece component 45 are inserted into the limiting holes 34 of the first dumbbell piece 36, and the limiting columns 421 on the second driven gear 461 of the second hanging piece component 46 are inserted into the limiting holes 34 of the second dumbbell piece 37, while the limiting columns 421 on the third driven gear 471 of the third hanging piece component 47 are inserted into the limiting holes 34 of the third dumbbell piece 38. The first dumbbell piece 36, the second dumbbell piece 37 and the third dumbbell piece 38 all remain on the dumbbell frame. At this time, it is on the seventh level.

When the user rotates seven times the rotating rod 21, the limiting columns 421 on the first driven gear 451 of the first hanging piece component 45 are inserted into the limiting holes 34 of the first dumbbell piece 36, and the limiting columns 421 on the second driven gear 461 of the second hanging piece component 46 are inserted into the limiting holes 34 of the second dumbbell piece 37. The limiting columns 421 on the third driven gear 471 of the third hanging piece component 47 are inserted into the limiting holes 34 of the third dumbbell piece 38, and the limiting columns 421 on the fourth driven gear 481 of the fourth hanging piece component 48 are inserted into the limiting holes 34 of the fourth dumbbell piece 39. The first dumbbell piece 36, the second dumbbell piece 37, the third dumbbell piece 38 and the fourth dumbbell piece 39 all remain on the dumbbell frame. At this time, it is on the eighth level.

Referring to FIGS. 10 to 12, in this embodiment, the dumbbell frame comprises a fixing frame 5 and a center shaft 2, wherein the fixing frame 5 includes a front baffle 51, a rear baffle 52 and a connecting plate 53. The hanging piece component 4 is arranged out of the center shaft 2 and between the front baffle 51 and the rear baffle 52. The rear baffle 52 is fixedly connected with the center shaft 2 and both sides of the connecting plate 53 are respectively connected with the front baffle 51 and the rear baffle 52.

Further, one side of the connecting plate 53 close to the front baffle 51 is provided with an identification block 531, and the front baffle 51 is provided with a fixing hole 511 matching with the identification block 531. The identification block 531 is inserted into the fixing hole 511. The rotation of the rotating rod 21 does not affect the fixing frame 5, and the positions of the fixing frame 5 and the center shaft 3 remain unchanged all the time.

In this embodiment, the dumbbell frame further comprises a gear assembly 6, which is arranged on both ends of the rotating rod 21 and forms a linkage connection with the rotating rod 21. When the user rotates the rotating rod 21, the gear assembly 6 is rotated as well. One side of the front baffle 51 close to the gear assembly 6 is provided with a positioning slot 512, wherein a first spring 513 and a positioning bead 514 are arranged in the positioning slot 512. Multiple positioning holes 61 are arranged at intervals in a circumferential direction on one side of the gear assembly 6 close to the front baffle 51. When the gear assembly 6 rotates, the positioning bead 514 penetrates out along different positioning holes 61.

Further, there are two groups of positioning slots 512, and the two groups of positioning slots are arranged on both sides of the front baffle 51. Correspondingly, there are a plurality of positioning holes 61 on the gear assembly 6. When the gear assembly 6 rotates each time, two of the positioning beads 514 penetrate out along two of the positioning holes 61 arranged relatively.

Further, one side of the gear assembly 6 away from the front baffle 51 is evenly divided into several dials 62. The amount of the positioning holes 61 is same as the amount of the dials 62.

In this embodiment, the side of the gear assembly 6 away from the front baffle 51 is evenly divided into eight dials, and each of the eight dials 6 is labeled with number 1 to 8 sequentially. Different numbers represent different levels. There are eight positioning holes 61 and the gear assembly 6 corresponds to eight levels of weight to the best. The gear assembly 6 is able to rotate eight times relatively to the front baffle 51, and the identification block 531 is of the function to identify the level. It can be understood that the identification block 531 is used to point the numbers on the dials 62 so that the user can determine conveniently the current level of the dumbbell.

In another embodiment, there are up to five groups of hanging piece components 4, and the dumbbell pieces 3 are up to five. Five groups of hanging piece components 4 and five dumbbell pieces 3 are combined to form ten levels of different weights. The gear assembly 6 is evenly divided into ten dials for identifying ten levels.

When the dumbbell is on the first level, the identification block 531 points to the number 1 on the dials 62. When the dumbbell is on the second level, the identification block 531 points to the number 2 on the dials 62, and so on. The user can observe the gear assembly 6 directly to determine the current level of the dumbbell.

Referring to FIG. 13, in this embodiment, the base 1 is provided with fixing grooves 12 in the same amount of the dumbbell pieces 3. The fixing groove 12 is provided with a positioning protrusion 13, and a groove 35 matching with the positioning protrusion 13 is arranged on the bottom of the dumbbell piece 3. The groove 35 cooperates with the positioning protrusion 13 to enable the dumbbell piece 3 to be placed stably on the base 1.

Referring to FIGS. 13 to 15, in this embodiment, a locking groove 515 is arranged on the bottom of the front baffle 51, and a locking block 516 is arranged inside the locking groove 515. The locking block 516 is connected with the top of the locking groove 515 through the second spring 518, and an avoidance groove 517 is arranged in the middle of the locking block 516. A plurality of fixing blocks 63 are arranged at intervals in a circumferential direction on one side of the gear assembly 6 facing to the front baffle 51, and a protrusion structure 11 matching with the locking block 516 is arranged on the base 1.

Further, the amount of the fixing blocks 63 is same as the amount of the dials 62. In this embodiment, there are eight dials 62 as well as eight fixing blocks 63.

It can be understood that when the front baffle 51 is placed on the base 1, the protrusion structure 11 on the base 1 makes the locking block 516 move towards the direction close to the locking groove 515. When the second spring 518 is compressed, the fixing blocks 63 pass through along the plug-in slots 423 and the dumbbell stays in a level adjustable state; when the front baffle 51 separates from the base 1, under the elastic resetting of the second spring 518, the locking block 516 moves towards the direction away from the locking groove 515. The upper end of the locking block 516 is inserted between two adjacent fixing blocks 63, which makes the gear assembly 6 unable to rotate and the dumbbell stays in a level non-adjustable state.

Further, in this embodiment, the rotating rod 21 is provided with an anti-slip sleeve 211 on its outer periphery, and the anti-slip sleeve 211 is provided with an anti-slip pattern on its outer periphery. The anti-slip sleeve 211 can be made of rubber material and the anti-slip pattern is generated on the outer surface of the rubber material, which has the characteristics of anti-slip and durability.

It can be understood that, under the guidance of the above embodiments, those skilled in the art can combine various implementation methods in the above embodiments to obtain a technical solution of multiple implementation methods.

The above description is only preferred embodiments of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application are all within the protection scope of the present application.