Counterweight piece, dumbbell and kettle-bell

Abstract

The counterweight piece comprises a main body, and is characterized by further comprising a connecting piece and a first elastic piece, a first mounting hole penetrating up and down is formed in the main body, the connecting piece can be mounted in the first mounting hole in an up-down moving mode, and the connecting piece comprises a connecting section capable of stretching out of or retracting into the main body from the bottom of the main body; the first elastic piece is used for driving the connecting piece to move upwards to enable the connecting section to retract into the main body, and the connecting section is provided with a connecting structure used for being detachably connected with the hole in a rotating mode. When the counter weight is used, a finger stretches into the upper end opening of the first mounting hole to press the connecting piece so that the connecting section of the connecting piece can stretch out, and when the counter weight is not used, the connecting section is driven by the first elastic piece to retract into the main body, so that the size of the counter weight is reduced, and packaging and transportation of products are facilitated.

Description

Technical Field

[0001] This utility model relates to a counterweight, a dumbbell, and a kettlebell. Background Technology

[0002] Chinese patent document CN220860575U discloses a dumbbell with quickly adjustable weight, including a dumbbell handle. Dumbbell plates are fixedly connected to both ends of the handle. A counterweight is detachably connected to the outer side of each dumbbell plate. A locking block is provided on one side of the counterweight, and a locking groove matching the locking block is provided on the other side. The counterweight is engaged with adjacent counterweights via the locking block and locking groove. The locking block includes a pressing pin, a ball bearing, a spring, and a retaining pin sleeve. The retaining pin sleeve is fixedly connected to one side of the counterweight. A spring is placed at the bottom inner side of the retaining pin sleeve. The pressing pin is positioned above the spring, and a truncated cone is provided in the middle of the pressing pin. The counterweight is equipped with a ball bearing at the platform. The center of the locking groove has a ball bearing groove that connects with the ball bearing. The counterweight is inserted into the locking groove of the adjacent counterweight through a retaining pin. The locking block of the aforementioned counterweight assembly and disassembly structure protrudes from the counterweight, thereby increasing the volume of the counterweight. This makes it impossible for one side of the counterweight to be laid flat, which is not aesthetically pleasing and is not conducive to the packaging, transportation, and storage of the counterweight. In addition, the counterweight is assembled and disassembled by pressing the aforementioned pressing pin. The pressing pin is located on the outside and is easy to accidentally knock the counterweight off. Furthermore, the locking of the counterweight after connection is achieved by the ball bearing and the locking groove. However, the locking is not stable and can easily cause the counterweight to separate and fall off.

[0003] Chinese patent document CN220385691U discloses a counterweight connection structure and an adjustable weight dumbbell. The connection structure enables a detachable connection between two counterweights. One counterweight has a locking groove, and the other counterweight has a locking part that can be inserted into the locking groove. The two counterweights can be rotated relative to each other, allowing the locking part to rotate relative to the locking groove between a locked position and a released position. When the locking part is in the locked position, it engages with the locking groove to prevent the two counterweights from disengaging. When the locking groove is in the released position... In this design, the two counterweights are separable. One counterweight has a button that can swing between a locked and a released state, and an elastic element that drives the button to the locked state. The other counterweight has a slot, into which the front end of the button in the locked state can be inserted to restrict the relative rotation of the two counterweights and keep the locking part in the locked position. In this design, the locking part protrudes from the counterweight, thereby increasing the volume of the counterweight and preventing one side of the counterweight from lying flat, which affects the appearance of the product and is not conducive to the packaging, transportation and storage of the counterweight. Summary of the Invention

[0004] The purpose of this invention is to provide a counterweight for dumbbells or kettlebells, wherein the connecting section for connecting the counterweight to other components is retractable to reduce the volume of the counterweight when not in use.

[0005] A counterweight includes a main body, characterized in that it further includes a connector and a first elastic member. The main body has a first mounting hole that extends vertically. The connector is movably mounted in the first mounting hole. The connector includes a connecting segment that can extend from the bottom of the main body or retract into the main body. The first elastic member is used to drive the connector to move upward so that the connecting segment retracts into the main body. The connecting segment is provided with a connecting structure for detachably connecting with the hole by relative rotation.

[0006] In the above scheme, when it is necessary to connect the counterweight to other components, a finger can be inserted into the upper port of the first mounting hole to press the connector, which will cause the connecting section of the connector to extend. The connecting structure of the connecting section can be connected to the holes of other components by relative rotation. The specific connecting structure can be a thread or a rotating snap-fit ​​structure, such as the snap-fit ​​part and snap-fit ​​groove (hole) disclosed in Chinese patent document CN220385691U. They are connected to each other by relative rotation. The holes of other components are provided with corresponding mating structures. When not in use, the connecting section is retracted into the main body under the drive of the first elastic element, thereby reducing the volume of the counterweight and facilitating the packaging and transportation of the product.

[0007] This utility model also includes a pressing member, a locking member, and a second elastic member. The pressing member is movably mounted on the connecting member, and the locking member is movably mounted on the connecting section. The locking member includes a locking part that can extend from the side of the connecting section or retract into the connecting section. The pressing member is provided with a first driving part, and the locking member is provided with a second driving part that cooperates with the first driving part. When the pressing member is pressed down, the first driving part and the second driving part cooperate to drive the locking part to retract into the connecting section. When the pressing member moves upward, the first driving part and the second driving part cooperate to drive the locking part to extend from the side of the connecting section. The second elastic member is used to drive the pressing member to move upward.

[0008] In the above scheme, the counterweight is connected to other components by rotation through the mounting holes of the connecting section. The locking part can be embedded in the locking groove of the mounting hole of other components to restrict the rotation of the connecting section relative to the mounting hole, thereby achieving a reliable connection between the counterweight and other components. When the counterweight is not in use, the connecting section can retract into the counterweight, thereby reducing the volume of the counterweight and making the counterweight structure more reasonable and compact. The method of assembling and disassembling the counterweight from other components is as follows: the user's finger presses the pressing part through the first mounting hole, causing the pressing part to move downward relative to the connecting part, and at the same time, the connecting part also moves downward, so that... When the connecting section of the connector extends out of the main body and the pressing member moves downward relative to the connector, the locking part of the locking member can be driven to retract the connecting section through the first driving part and the second driving part. At this time, the connecting section can be threaded into the mounting hole of other components. After the connecting section is screwed into the mounting hole, the pressing member is released. Driven by the second elastic member, the pressing member moves upward. Through the cooperation of the first driving part and the second driving part, the locking part of the locking member is driven to extend from the side of the connecting section and embed into the locking groove of the mounting hole, thereby restricting the rotation of the connecting section relative to the mounting hole. In this way, a reliable connection between the counterweight and other components can be achieved.

[0009] The detachable connection structure is a first external thread formed on the outer circumferential surface of the connection section. The use of a threaded structure has the advantages of simple structure, low cost, convenient operation and reliable connection.

[0010] The first driving part is an inclined extending driving block, and the second driving part is a driving hole adapted to the driving block. The driving block extends into the driving hole. In this way, when the pressing part moves up and down, the locking part can be driven to move laterally through the cooperation of the driving block and the driving hole. The structure is simple and the operation is convenient.

[0011] The inner wall of the first mounting hole is formed with a first locking groove for the locking part to be inserted. The upper section of the first mounting hole is formed with a first internal thread that matches the first external thread of the connecting section. When the connecting section of one counterweight is threadedly connected to the first mounting hole of another counterweight, the locking part can be inserted into the first locking groove to restrict the rotation of the connecting section relative to the first mounting hole. This structure can realize a reliable connection between counterweights and can continuously install and stack counterweights as needed.

[0012] The main body includes a housing with the first mounting hole formed in the middle and a counterweight block disposed in the housing. The housing includes an upper housing and a lower end cover that are fastened together. The upper housing includes an upper annular inner wall, an annular outer wall and a top wall connecting the upper edges of the upper annular inner wall and the annular outer wall. The lower end cover closes the lower port of the annular outer wall and forms an upwardly extending lower annular inner wall on the lower end cover. The upper annular inner wall and the lower annular inner wall constitute the first mounting hole. A downwardly extending guide notch is formed on the upper edge of the lower annular inner wall. The connector includes a guide limiting part extending into the guide notch. This structure facilitates the assembly of the product.

[0013] The first elastic element is a first helical spring compressed between the guide limiting part and the lower end cover.

[0014] The connector includes a first cylinder with an opening at the upper end. A mounting groove extending radially is formed on the outer peripheral surface of the first cylinder. The locking member is movably disposed in the mounting groove, which restricts the locking member to move only radially along the first cylinder.

[0015] The pressing element includes a second cylinder and a pressing cap that closes the upper port of the second cylinder. The second cylinder is movably sleeved in the first cylinder from the upper port of the first cylinder. The second cylinder includes a lower section and an upper section. The diameter of the lower section is smaller than the diameter of the upper section. The second elastic element is a second helical spring that is sleeved on the lower section and compressed between the second cylinder and the first cylinder.

[0016] The outer wall of the second cylinder has an elastic snap-fit ​​portion, and the first cylinder has a guide hole that mates with the elastic snap-fit ​​portion. The elastic snap-fit ​​portion is located in the guide hole to prevent the second cylinder from detaching from the first cylinder. This structure facilitates product assembly.

[0017] The main body is an annular ring with the first mounting hole formed in the middle, which makes the structure of the counterweight more reasonable and the connection between the counterweight and other components more reliable and stable.

[0018] A dumbbell, characterized in that it includes the aforementioned counterweight.

[0019] A dumbbell includes a grip and two weights disposed at both ends of the grip. The dumbbell is characterized by further including the counterweight, which has a second mounting hole. The inner wall of the second mounting hole has a second locking groove for a locking portion of the counterweight to be inserted. The connection structure consists of a first external thread formed on the outer circumferential surface of the connecting section. The second mounting hole has a second internal thread adapted to the first external thread of the connecting section. When the connecting section of one counterweight is threadedly connected to the second mounting hole, the locking portion can be inserted into the second locking groove to restrict the rotation of the connecting section relative to the second mounting hole. This allows for a detachable connection between the counterweight and the weights, enabling the addition or removal of counterweights as needed to adjust the dumbbell weight.

[0020] A kettlebell, characterized in that it includes either the aforementioned counterweight or the aforementioned dumbbell.

[0021] The kettlebell also includes a handle and two connectors. The handle has two downward-extending ends, and the two connectors are respectively disposed at the two ends of the handle. The outer circumferential surface of the connector is formed with a second external thread, and the first mounting hole is formed with a first internal thread that mates with the second external thread. The threaded structure facilitates the threaded connection between the connector and the first mounting hole.

[0022] The handle has rotating seats at both ends that can rotate around a vertical axis. The connector is mounted on the rotating seats. The connector can be rotated by rotating the rotating seats, which facilitates the threaded connection between the connector and the first mounting hole.

[0023] The bottom of the rotating seat has a flat support surface. The connector can extend from the support surface or retract into the rotating seat. A third elastic element is provided between the connector and the rotating seat to drive the connector to extend. In this way, the handle can be used as a push-up aid. When in use, the support surface of the rotating seat is supported on the bottom surface, and the handle is held to perform push-up exercises. Attached Figure Description

[0024] The present invention will now be described in further detail with reference to the accompanying drawings.

[0025] Figure 1 This is a 3D view of the counterweight, with the connecting section retracted into the main body.

[0026] Figure 2 This is a three-dimensional view of the counterweight, with the connecting section extending out of the main body.

[0027] Figure 3 This is a cross-sectional view of the counterweight, with the connecting section extending out of the main body.

[0028] Figure 4 This is a cross-sectional view of the counterweight component from the middle, with the connecting section retracted into the main body.

[0029] Figure 5 This is an exploded view of the counterweight components.

[0030] Figure 6 This is an exploded view of the counterweight component from another perspective.

[0031] Figure 7 This is a cross-sectional view of the two counterweights combined.

[0032] Figure 8 A perspective view of the kettlebell provided for this utility model.

[0033] Figure 9 An exploded view of the components of the kettlebell provided by this utility model.

[0034] Figure 10 A three-dimensional view of a dumbbell is provided for this utility model.

[0035] Figure 11 The front view of the kettlebell provided by this utility model.

[0036] Figure 12 for Figure 11 DD section view.

[0037] Figure 13 This is a top view of the kettlebell.

[0038] Figure 14 for Figure 13 EE-directed sectional view. Detailed Implementation

[0039] Reference Figures 1 to 7 As shown, a counterweight A includes a main body 1, a connector 2, a first elastic element 23, a pressing element 4, a locking element 3, and a second elastic element 44. The main body 1 has a first mounting hole 14 that runs vertically through the middle, making the main body 14 approximately annular. The main body 1 includes a shell with the first mounting hole 14 in the middle and an annular counterweight 17 disposed in the shell. The shell includes an upper shell 1a and a lower end cover 1b that are fastened together vertically. The upper shell 1a includes an upper annular inner wall 12, an annular outer wall 11, and a top wall 13 connecting the upper edges of the upper annular inner wall 12 and the annular outer wall 11. The lower end cover 1b closes the lower port of the annular outer wall 11. An upwardly extending lower annular inner wall 16 is formed on the lower end cover 1b. The upper annular inner wall 12 and the lower annular inner wall 16 constitute the first mounting hole 14.

[0040] The connector 2 is movably installed in the first mounting hole 14. The connector 2 includes a first cylindrical body 21 and two guide limiting parts 22. The first cylindrical body 21 is open at the top and closed at the bottom. The first cylindrical body 21 is a circular cylindrical body. The two guide limiting parts 22 are symmetrically arranged on opposite sides of the outer circumferential surface of the first cylindrical body 21. The guide limiting part 22 includes a horizontal section 221 connecting to the outer circumferential surface of the first cylindrical body 21, a vertical section 222 extending upward from the outer end of the horizontal section 221, and a spring support section 223 extending outward from the upper end 222 of the vertical section. A downwardly extending guide notch 161 is formed on the upper edge of the lower annular inner wall 16. The horizontal section 221 of the guide limiting part 22 extends into the guide notch 16 and is adapted to the guide notch 161, thereby restricting the connector 2 from rotating relative to the first mounting hole 14. The guide connector 2 moves up and down. The lower section of the first cylinder 21 forms a connecting section 2a that can extend from the bottom of the main body 1 or retract into the main body 1. The outer peripheral surface of the connecting section 2a has a first external thread 211. The first external thread 211 is a wide-pitch thread or a thread-like protrusion formed on the outer peripheral surface of the connecting section 2a. The wide-pitch thread and the thread-like protrusion are both for the purpose of: when using, rotating the counterweight A by a small angle can achieve complete screwing of the connecting section 2a with the mounting holes of other components. In this embodiment, the first external thread 211 is a thread-like protrusion. The first elastic member 23 is used to drive the connector 2 to move upward so that the connecting section 2a retracts into the main body 11. The first elastic member 23 is a first helical spring compressed between the spring support section 223 of the guide limiting part 22 and the lower end cover 15.

[0041] The locking member 3 is laterally movable on the connecting section 2a. Specifically, the outer peripheral surface of the lower end of the first cylinder 21 has a mounting groove 212 extending radially therein. The locking member 3 is movably disposed in the mounting groove 212, which restricts the locking member 3 to move only radially along the first cylinder 21. The locking member 3 has a plate-like structure and includes a locking part 31 that can extend from or retract from the side of the connecting section 2a. The pressing member 4 is vertically movable on the connecting member 2 and located in the first mounting hole 14. The pressing member 4 includes a second cylinder and a pressing cover 43 that closes the upper port of the second cylinder. The second cylinder is movably fitted inside the first cylinder 21 from the upper end of the first cylinder 21. The second cylinder includes a lower section 42 and an upper section 41. The diameter of the lower section 42 is smaller than the diameter of the upper section 41. The second elastic element 44 is a second helical spring fitted on the lower section 42 and compressed between the second cylinder and the first cylinder 2. An elastic buckle part 411 is formed on the outer wall of the upper section 41 of the second cylinder. A guide hole 213 is formed on the first cylinder 2 to cooperate with the elastic buckle part 411. The elastic buckle part 411 is located in the guide hole 213 to restrict the second cylinder from detaching from the first cylinder 2. This structure can facilitate the assembly of the product.

[0042] The pressing member 4 is provided with a first driving part, and the locking member 3 is provided with a second driving part that cooperates with the first driving part. When the pressing member 4 is pressed down and moves downward, the first driving part and the second driving part cooperate to drive the locking part 31 to retract into the connecting section 2a. When the pressing member 4 moves upward, the first driving part and the second driving part cooperate to drive the locking part 31 to extend out from the side of the connecting section 2a. The second elastic member 44 is used to drive the pressing member 4 to move upward. Specifically, the first driving part is an inclined extending driving block 45, and the second driving part is a driving hole 32 that is adapted to the driving block 45. The driving hole obliquely penetrates the locking member 3, and the driving block 45 extends into the driving hole 32. In this way, when the pressing member 4 moves up and down, the locking member 3 can be driven to move laterally through the cooperation of the driving block 45 and the driving hole 32. The structure is simple and the operation is convenient.

[0043] The upper inner wall of the first mounting hole 14 has a first locking groove 122 for the locking part 31 to be inserted. The upper section of the first mounting hole 14 has a first internal thread 121 that matches the first external thread 211 of the connecting section 2a. That is, the first locking groove 122 and the first internal thread 121 are formed on the upper annular inner wall 12. When the connecting section 2a of one counterweight A is threadedly connected to the first mounting hole 14 of another counterweight A, the locking part 31 can be inserted into the first locking groove 122 to restrict the rotation of the connecting section 2a relative to the first mounting hole 14. This structure can realize a reliable connection between counterweights A and counterweights A, and counterweights A can be continuously installed and stacked as needed. Specifically, as shown in the figure... Figure 7 As shown.

[0044] The first external thread 211 of the connecting section 2a of the counterweight A can be threadedly connected to the internal thread of the mounting hole of other components, while the locking part 31 can be embedded in the locking groove of the mounting hole of other components to restrict the rotation of the connecting section 2a relative to the mounting hole, thereby realizing the reliable connection between the counterweight A and other components. When the counterweight A is not in use, the connecting section 2a can be retracted into the counterweight A, thereby reducing the volume of the counterweight and making the structure of the counterweight A more reasonable and compact. The first mounting hole 14 is formed with a clearance groove 18 to avoid the locking part 31.

[0045] The counterweight A is assembled and disassembled with other components by the user pressing the pressing member 4 through the first mounting hole 14, causing the pressing member 4 to move downward relative to the connecting member 2. At the same time, the connecting member 2 also moves downward, causing the connecting section 2a of the connecting member 2 to extend out of the main body 1. As the pressing member 4 moves downward relative to the connecting member 2, the locking part 31 of the locking member 3 is driven back into the connecting section 2a by the cooperation of the driving block 45 and the driving hole 32. At this time, the connecting section 2a can be threaded into the mounting hole of other components. After the connecting section 2a is screwed into the mounting hole, the pressing member 4 is released. Driven by the second elastic member 44, the pressing member 4 moves upward. Through the cooperation of the driving block 45 and the driving hole 32, the locking part 31 of the locking member 3 extends out from the side of the connecting section 2a and is embedded in the locking groove of the mounting hole, thereby restricting the rotation of the connecting section 2a relative to the mounting hole. In this way, the counterweight A can be reliably connected with other components.

[0046] Reference Figure 10 As shown, a dumbbell C includes a grip bar 61, two weights 62 disposed at both ends of the grip bar 61, and four counterweights A. Each weight 62 has a second mounting hole 623 extending vertically. Each weight 62 includes a housing 621 and an annular counterweight block 622. The inner walls of the upper and lower sections of the second mounting hole 623 are formed with second locking grooves 624 for the locking part 31 of the counterweight A to be inserted into, and second internal threads 625 that mate with the first external thread 211 of the connecting section 2a. When the connecting section 2a of a counterweight A is threadedly connected to the second mounting hole 623, the locking part 31 can be inserted into the second locking groove 624 to restrict the rotation of the connecting section 2a relative to the second mounting hole 623, thereby achieving a detachable connection between the counterweights A and the weights 62. Thus, counterweights A can be installed at the upper and lower ends of each weight 62, and additional counterweights A can be added to the counterweights A, allowing the weight of the dumbbell to be adjusted according to exercise needs. The specific connection method between the counterweights A can be referred to... Figure 7 As shown.

[0047] Reference Figures 8 to 14 As shown, a kettlebell B includes an arc-shaped handle 5, connectors 52 at both ends of the handle 5, and a dumbbell C. The handle 5 has two downwardly extending ends, and each end of the handle 5 has a rotatable rotating seat 51. Specifically, the upper end of the rotating seat 51 has a concave annular transition groove 512, and the end of the handle 5 has an annular transition portion 54 that matches the annular transition groove 512. In order to eliminate the gap between the rotating seat 51 and the handle 5 and increase the rotational damping, an elastic washer 55 is provided between the annular transition groove 512 and the annular transition portion 54. The elastic washer 55 is a rubber ring or a silicone ring.

[0048] The connector 52 is movably mounted on the rotating seat 51. The connector 52 is cylindrical, and a second external thread 521 is formed on the outer circumferential surface of the connector 52. A first internal thread 121 that engages with the second external thread 521 is formed in the first mounting hole 14. A flat support surface 511 is formed at the bottom of the rotating seat 51. The connector 52 can extend from or retract from the support surface 511 into the rotating seat 51. A third helical spring 53 is provided between the connector 52 and the rotating seat 51 to drive the connector 52 to extend. In this way, the handle 5 can be used as a push-up aid, with the support surface 511 of the rotating seat 51 supporting the bottom. On the surface, the connector 52 retracts into the rotating seat 51, and the hand holds the handle 5 to perform push-ups. In addition, by rotating the rotating seat 51, the connector 52 can be rotated, so that the connector 52 is threadedly connected to the first mounting hole 14 of the counterweight A. In this way, the connector 52 can be connected to the counterweight A on the dumbbell C, thus forming a kettlebell B. The rotating seat 51 can be used to operate the connector 52 to rotate so that the connector 52 is threadedly connected to the first mounting hole 14 of the counterweight A. Of course, the counterweight A can also be directly connected to the connector 52 as needed, and the number of counterweights A can be selected as needed, thus forming an adjustable weight kettlebell B.

[0049] The above description is merely a preferred embodiment of the present utility model, and therefore cannot be used to limit the scope of the present utility model. All equivalent changes and modifications made in accordance with the scope of the patent application and the contents of the specification of the present utility model should still fall within the scope of the patent of the present utility model.

Claims

1. A counterweight comprising a body, characterised in that: It also includes a connector and a first elastic member. The main body has a first through-hole. The connector is movable in the first mounting hole. The connector includes a connecting section that can extend from the bottom of the main body or retract into the main body. The first elastic member is used to drive the connector to move upward so that the connecting section retracts into the main body. The connecting section is provided with a connecting structure for detachable connection with the hole by relative rotation.

2. A counterweight according to claim 1, wherein: It also includes a pressing member, a locking member, and a second elastic member. The pressing member is movably mounted on the connecting member, and the locking member is movably mounted on the connecting section. The locking member includes a locking part that can extend from the side of the connecting section or retract into the connecting section. The pressing member is provided with a first driving part, and the locking member is provided with a second driving part that cooperates with the first driving part. When the pressing member is pressed down, the first driving part and the second driving part cooperate to drive the locking part to retract into the connecting section. When the pressing member moves upward, the first driving part and the second driving part cooperate to drive the locking part to extend from the side of the connecting section. The second elastic member is used to drive the pressing member to move upward.

3. A counterweight according to claim 2, wherein: The connection structure is a first external thread formed on the outer circumferential surface of the connection segment.

4. A counterweight according to claim 2, wherein: The first driving part is an inclined driving block, and the second driving part is a driving hole adapted to the driving block, with the driving block extending into the driving hole.

5. A counterweight according to claim 3, wherein: The inner wall of the first mounting hole is formed with a first locking groove for the locking part to be inserted. The upper section of the first mounting hole is formed with a first internal thread that is adapted to the first external thread of the connecting section. When the connecting section of one counterweight is threadedly connected to the first mounting hole of another counterweight, the locking part can be inserted into the first locking groove to restrict the connecting section from rotating relative to the first mounting hole.

6. A counterweight according to any one of claims 1 to 5, wherein: The main body includes a housing with the first mounting hole formed in the middle and a counterweight block disposed in the housing. The housing includes an upper housing and a lower end cover that are fastened together. The upper housing includes an upper annular inner wall, an annular outer wall and a top wall connecting the upper edges of the upper annular inner wall and the annular outer wall. The lower end cover closes the lower port of the annular outer wall. An upwardly extending lower annular inner wall is formed on the lower end cover. The upper annular inner wall and the lower annular inner wall constitute the first mounting hole. A downwardly extending guide notch is formed on the upper edge of the lower annular inner wall. The connector includes a guide limiting part extending into the guide notch.

7. A counterweight according to claim 6, wherein: The first elastic element is a first helical spring compressed between the guide limiting part and the lower end cover.

8. A counterweight according to any one of claims 2 to 5, wherein: The connector includes a first cylinder with an opening at the upper end. A mounting groove extending radially is formed on the outer peripheral surface of the first cylinder. The locking member is movably disposed in the mounting groove, which restricts the locking member to move only radially along the first cylinder.

9. A counterweight according to claim 8, wherein: The pressing element includes a second cylinder and a pressing cap that closes the upper port of the second cylinder. The second cylinder is movably sleeved in the first cylinder from the upper port of the first cylinder. The second cylinder includes a lower section and an upper section. The diameter of the lower section is smaller than the diameter of the upper section. The second elastic element is a second helical spring that is sleeved on the lower section and compressed between the second cylinder and the first cylinder.

10. A counterweight according to claim 9, wherein: The outer wall of the second cylinder has an elastic latching part, and the first cylinder has a guide hole that cooperates with the elastic latching part. The elastic latching part is located in the guide hole to prevent the second cylinder from detaching from the first cylinder.

11. A counterweight according to any one of claims 2 to 5, wherein: The main body is an annular ring with the first mounting hole formed in the middle.

12. A counterweight according to any one of claims 2 to 5, wherein: The first mounting hole has a clearance groove to avoid the locking part.

13. A dumbbell characterized by: Includes the counterweight as described in any one of claims 1 to 12.

14. A dumbbell comprising a handle and two weights disposed at either end of the handle, characterised in that: It also includes a counterweight as described in any one of claims 2 to 12, wherein the counterweight has a second mounting hole, the inner wall of the second mounting hole has a second locking groove for the locking part of the counterweight to be inserted, the connection structure is a first external thread formed on the outer peripheral surface of the connecting section, the second mounting hole has a second internal thread adapted to the first external thread of the connecting section, and when the connecting section of a counterweight is threadedly connected to the second mounting hole, the locking part can be inserted into the second locking groove to restrict the rotation of the connecting section relative to the second mounting hole.

15. A kettlebell characterized in that: Includes the counterweight as described in any one of claims 1 to 12 or the dumbbell as described in claim 13 or 14.

16. A kettlebell according to claim 15, characterised in that: It also includes a handle and two connectors. The handle has two downwardly extending ends, and the two connectors are respectively disposed at the two ends of the handle. The outer peripheral surface of the connector is formed with a second external thread, and the first mounting hole is formed with a first internal thread that engages with the second external thread.

17. A kettlebell according to claim 16, wherein: The handle is provided with rotating seats at both ends that can rotate around a vertical axis, and the connector is provided on the rotating seats.

18. A kettlebell according to claim 17, characterised in that: The bottom of the rotating seat has a flat support surface, and the connector can extend from the support surface or retract into the rotating seat. A third elastic element is provided between the connector and the rotating seat to drive the connector to extend.

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