Multifunctional kettle-bell

Abstract

A multifunctional kettle-bell comprises a shell with a handle and a plurality of balancing weights, and is characterized by further comprising at least one holding rod used for being detachably assembled with the balancing weights to form a dumbbell or a barbell, the shell comprises two overturning shells, and the two overturning shells can be overturned between an opening state and a closing state. The inner sides of the overturning shells are provided with first installation grooves used for containing balancing weights, the two overturning shells in the closed state are oppositely buckled to form the kettle-bell, the two overturning shells in the open state are opened to store and take the balancing weights, when the kettle-bell is used, the balancing weights can be placed in the first installation grooves of the overturning shells, the two overturning shells are closed to form the kettle-bell, and therefore the kettle-bell can be used as the kettle-bell. And the balancing weight and at least one holding rod can be assembled to form a dumbbell or a barbell, so that the kettle-bell can be used as the dumbbell or the barbell, and the kettle-bell provided by the utility model has multiple functions.

Description

Technical Field

[0001] The utility model relates to a kettlebell. Background Art

[0002] Chinese patent document CN220918030U discloses a kettlebell with adjustable weight, including a shell, a handle, a plurality of weight plates, and a base. The shell includes an inner and outer shell, a weight support frame, the weight support frame is fixed to the inner and outer shells, and the weight support frame is provided with hangers corresponding to the weight plates; the weight plates are positioned and stacked in sequence, and arc-shaped gears corresponding to the hangers are provided on the weight plates, and the arc-shaped gears are arranged from long to short from top to bottom and form weight adjustment gears; a center positioning seat is provided on the base, and a turntable is provided between the base and the center positioning seat, the weight plates are positioned and placed on the center positioning seat, and the shell is positioned and placed on the turntable and covers the weight plates; when the handle drives the shell to rotate, the hangers slide under the corresponding arc-shaped gears to realize weight adjustment.

[0003] The kettlebell of the above structure can only be used as a kettlebell for exercise. Although the weight can be adjusted, it cannot achieve other functional exercises. Summary of the invention

[0004] The utility model aims to provide a multifunctional kettlebell which can be used as a kettlebell and also as a dumbbell or a barbell in view of the deficiencies in the prior art.

[0005] The purpose of the utility model is achieved through the following technical solutions:

[0006] A multifunctional kettlebell comprises a shell with a handle and a plurality of counterweights, characterized in that it also comprises at least one grip bar for detachably assembling with the counterweights to form a dumbbell or a barbell, the shell comprises two flip shells, the two flip shells can be flipped between an open state and a closed state, a first mounting groove for placing the counterweights is arranged on the inner side of the flip shell, the two flip shells in the closed state are relatively buckled to form a kettlebell, and the two flip shells in the open state are opened to store and retrieve the counterweights.

[0007] When in use, the counterweight block can be placed in the first installation groove of the flip shell and the two flip shells can be closed to form a kettlebell, so that it can be used as a kettlebell. The counterweight block can also be assembled with at least one grip bar to form a dumbbell or a barbell, so that it can be used as a dumbbell or a barbell. The kettlebell provided by the utility model has multiple functions.

[0008] The inner side of the flip shell is provided with a plurality of the first installation grooves matched with the counterweight blocks, or the inner side of the flip shell is provided with one first installation groove matched with a plurality of the counterweight blocks closely arranged on the outer peripheral surface.

[0009] A first installation groove can be set for each counterweight block so that the counterweight blocks can be installed independently without affecting each other, thereby ensuring the stable installation of each counterweight block; multiple counterweight blocks with closely arranged outer surfaces can also be installed in a first installation groove. Since the multiple counterweight blocks are closely arranged, the counterweight blocks will not shake, affecting the stable installation of the counterweight blocks.

[0010] The inner side of the flip shell is provided with a first mounting groove adapted to the four counterweight blocks. The four counterweight blocks are arranged closely in a matrix, which can ensure that the number of counterweight blocks can be flexibly assembled into dumbbells or barbells of various weights. The space inside the shell can be reasonably utilized to prevent the volume of the shell from being too large, making it convenient to use it as a kettlebell.

[0011] The two flip shells have relatively buckled buckling edges, the buckling edge of one flip shell is formed with an edge groove extending along its length direction, and the buckling edge of the other flip shell is formed with a convex edge extending along its length direction and adapted to the edge groove. When the two flip shells are relatively buckled, the convex edge is embedded in the edge groove, thereby preventing the two flip shells from misaligning and moving after closing.

[0012] The shell body also includes a bottom shell, and the lower ends of the two flip shells are rotatably connected to the two sides of the bottom shell respectively. The arrangement of the bottom shell can make the bottom of the shell body stronger.

[0013] The lower edges of the two flip shells in the closed state are matched and spliced ​​with the upper edges of the bottom shell, and a receiving groove extending along the length direction is formed on the inner side of the lower edge of the flip shell, and a receiving protrusion matched with the receiving groove is formed on the inner side of the upper edge of the bottom shell, so that it can be ensured that the bottom shell and the two flip shells form a structurally stable shell after closing.

[0014] The flip shell is rotatably connected to the bottom shell through a hinge mechanism, and the hinge mechanism includes a first pivot seat, a second pivot seat and a connecting rod, the first pivot seat includes two first adapter plates arranged parallel to each other on the flip shell, the second pivot seat includes two second adapter plates arranged parallel to each other on the bottom shell, one end of the connecting rod is rotatably arranged between the two first adapter plates through a first pivot axis, and the other end of the connecting rod is rotatably arranged between the two second adapter plates through a second pivot axis. The setting of the connecting rod can make the flipping of the flip shell more flexible and avoid interference between components.

[0015] The flip shell is rotatably connected to the bottom shell through the two hinge mechanisms. The two hinge mechanisms share a first pivot axis and a second pivot axis. The first pivot axis crosses the two first adapter plates of the two hinge mechanisms and one end of the connecting rod, and the second pivot axis crosses the two second adapter plates of the two hinge mechanisms and the other end of the connecting rod. The two hinge mechanisms can make the rotation of the flip shell more stable.

[0016] It also includes a switch mechanism for keeping the two flip shells in a closed state, the switch mechanism includes a button, a spring and a locking hole, the button is movably arranged on one of the flip shells between a locking position and a release position, the spring is used to drive the button to move to the locking position, the button is provided with an upwardly protruding locking portion, the locking hole is provided on the other flip shell, when the button is in the locking position, the locking portion is embedded in the locking hole to limit the opening of the two flip shells, when the button is pressed to the release position, the locking portion is disengaged from the locking hole so that the two flip shells can be opened.

[0017] The shell is in the shape of a kettlebell that is small at the top and large at the bottom. This structure is more suitable for use as a kettlebell.

[0018] One half of the handle is formed on the upper end of one flip shell, and the other half of the handle is formed on the upper end of the other flip shell. When the two flip shells are closed, they form the handle.

[0019] A dovetail groove is formed on one side of the counterweight block, with one end of the dovetail groove being closed and the other end being open to the outer peripheral surface of the counterweight block. A first plug-in portion that can be adapted to be plugged into the dovetail groove is formed on the other side of the counterweight block. Two adjacent counterweight blocks are plug-in-matched with the dovetail groove through the first plug-in portion. A locking mechanism is provided on the counterweight block to limit the sliding of the first plug-in portion relative to the dovetail groove.

[0020] The locking mechanism includes a knob, a driving block, a slider and a spring. The slider can be slidably arranged on the counterweight block between a locking position and a release position. The sliding direction of the slider is perpendicular to the length direction of the dovetail groove. The slider has a limiting portion that can extend into the dovetail groove. The first plug-in portion is formed with a first limiting groove that matches the limiting portion. When the slider is in the locking position, the limiting portion is embedded in the first limiting groove to limit the first plug-in portion from sliding relative to the dovetail groove. The driving block can be rotatably arranged on the counterweight block. The knob is connected to the driving block. The driving block has an arc-shaped convex surface. The slider has an arc-shaped concave surface that matches the arc-shaped convex surface. When the knob drives the driving block to rotate, the arc-shaped convex surface and the arc-shaped concave surface cooperate to drive the slider to the release position, and the spring drives the slider to the locking position.

[0021] The locking mechanism includes two sliders located on both sides of the driving block and two springs driving the two sliders to slide to the locking position. The limiting parts of the two sliders are arranged relatively to each other. The two limiting parts simultaneously limit the sliding of the first plug-in part, thereby improving the stability of the limitation of the first plug-in part.

[0022] The outer peripheral surface of the counterweight block is formed with a slide groove for the sliding of the slider and the installation of the drive block. The counterweight block is provided with a cover plate for covering the slide groove. The drive block is rotatably arranged in the slide groove through a rotating shaft. The rotating shaft passes through the cover plate and is connected to the knob. This structure facilitates the assembly of the product.

[0023] The inner side of the flip shell is provided with the second mounting groove matched with the gripping rod, and the second mounting groove is located below the first mounting groove.

[0024] In this way, all components of the product can be stored in the shell, making it convenient to store and transport the product.

[0025] It also includes a plurality of grips for being assembled with the counterweights to form dumbbells or barbells, the grips being tubular structures, at least two of the counterweights being provided with detachable connecting seats, the connecting seats being provided with second plug-in portions which are plugged into dovetail grooves, both ends of at least one grip being provided with connecting structures for being detachably connected to the connecting seats, one end of at least one grip being provided with a plug-in section with a reduced diameter, and the other end being provided with a connecting structure for being detachably connected to the connecting seat, one end of at least one grip being provided with a plug-in section with a reduced diameter, and the other end being provided with connecting structures for being detachably connected to the connecting seat, the outer peripheral surface of the plug-in section being provided with a retractable spring buckle, and the grip being provided with a buckle hole for the spring buckle to be embedded in, so that dumbbells or barbells can be assembled by selecting different grips.

[0026] The connection structure includes a mounting plate arranged in the grip rod, the mounting plate is provided with screw holes, the connection seat is connected to the connection structure through bolts, and the bolts are locked and connected with the screw holes after passing through the connection seat. The structure is simple, easy to operate and low in cost.

[0027] A circular groove is formed on the connecting seat to receive the end of the grip rod, and a protruding positioning portion is provided on the wall of the circular groove. A positioning notch is formed on the end of the grip rod to match the positioning portion, which can not only realize the rapid positioning of the grip rod and the connecting seat, but also prevent the grip rod from rotating relative to the connecting seat. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The utility model is further described in detail below in conjunction with the accompanying drawings.

[0029] Figure 1 This is a three-dimensional diagram of the utility model, in which the two flip shells are in a closed state.

[0030] Figure 2 This is a three-dimensional diagram of the utility model, and the two flip shells are in an open state.

[0031] Figure 3 This is an exploded view of the components of the present utility model.

[0032] Figure 4 Exploded view of the switch mechanism.

[0033] Figure 5 It is a front view of the utility model.

[0034] Figure 6 for Figure 5 AA section view in.

[0035] Figure 7 for Figure 6 Enlarged view of part D in FIG.

[0036] Figure 8 It is a three-dimensional diagram of the third grip.

[0037] Fig. 9 The utility model is a front view of a dumbbell provided by the utility model.

[0038] Fig.10 for Fig. 9 BB section view in.

[0039] Fig.11 This is an exploded view of the components of a dumbbell.

[0040] Fig.12 This is another exploded view of the dumbbell.

[0041] Fig.13 A three-dimensional diagram of the counterweight.

[0042] Fig.14 This is a stereoscopic image of the counterweight from another perspective.

[0043] Fig.15 This is an exploded view of the components of the counterweight.

[0044] Fig.16 This is an exploded view of the components of the counterweight from another perspective.

[0045] Fig.17 Exploded view of the locking mechanism.

[0046] Fig.18 The utility model is a three-dimensional diagram of a barbell provided by the utility model. DETAILED DESCRIPTION

[0047] Reference Figures 1 to 7 As shown, a multifunctional kettlebell includes a shell 1, eight weight blocks 3, a first grip rod 62, four second grip rods 61 and a third grip rod 63.

[0048] The housing 1 includes a bottom shell 13, a first flip shell 11 and a second flip shell 12. The lower ends of the first flip shell 11 and the second flip shell 12 are rotatably connected to the two sides of the bottom shell 13, respectively, so that the first flip shell 11 and the second flip shell 12 can be flipped between an open state and a closed state. The first flip shell 11 and the second flip shell 12 in the closed state are relatively buckled to form a kettlebell. The first flip shell 11 and the second flip shell 12 in the opened state are opened to store and access the counterweight 3. The first flip shell 11 and the second flip shell 12 have relatively buckled buckled edges. The first flip shell 11 The buckling edge of the first flip shell 11 is formed with an edge groove 112 extending along its length direction, and the buckling edge of the second flip shell 12 is formed with a convex edge 122 extending along its length direction and adapted to the edge groove 112. When the first flip shell 11 and the second flip shell 12 are relatively buckled, the convex edge 122 is embedded in the edge groove 112, thereby preventing the first flip shell 11 and the second flip shell 12 from misaligning and moving after closing. In order to increase the strength of the bottom shell 13, a metal support plate 132 is provided on the bottom shell 13, and the metal support plate 132 is locked on the top of the bottom shell 13 by bolts.

[0049] The lower edges of the first flip shell 11 and the second flip shell 12 in the closed state are matched and spliced ​​with the upper edge of the bottom shell 13, and the inner sides of the lower edges of the first flip shell 11 and the second flip shell 12 are formed with receiving grooves 16 extending along their length directions, and the inner sides of the upper edges of the bottom shell 13 are formed with receiving protrusions 131 matched with the receiving grooves 16, so that it can be ensured that the bottom shell 13 and the first flip shell 11 and the second flip shell 12 form a structurally stable shell 1 after closing.

[0050] The first flip shell 11 and the second flip shell 12 are rotatably connected to the bottom shell 13 through two hinge mechanisms 5. The hinge mechanism 5 includes a first pivot seat, a second pivot seat and a connecting rod 53. The first pivot seat includes two first adapter plates 51 arranged on the first flip shell and the second flip shell in parallel and opposite to each other. The second pivot seat includes two second adapter plates 52 arranged on the bottom shell in parallel and opposite to each other. One end of the connecting rod 53 is rotatably arranged between the two first adapter plates 51 through a first pivot shaft 54, and the other end of the connecting rod 53 is rotatably arranged between the two second adapter plates 52 through a second pivot shaft 55. The connecting rod 53 is a plate-like structure. The first pivot shaft 54 ​​crosses the two first adapter plates 51 of the two hinge mechanisms 5 and one end of the connecting rod 53, and the second pivot shaft 55 crosses the two second adapter plates 52 of the two hinge mechanisms 5 and the other end of the connecting rod 53. The arrangement of two hinge mechanisms 5 can make the rotation of the first flip shell 11 and the second flip shell 12 more stable.

[0051] An annular handle a is formed at the upper end of the shell 1, half of the annular handle a is formed at the upper end a1 of the first flip shell 11, and the other half of the annular handle a is formed at the upper end a2 of the second flip shell 12. In order to keep the first flip shell 11 and the second flip shell 12 in a closed state, a switch mechanism 2 is provided at the lower edge of the annular handle a. The switch mechanism 2 includes a mounting seat 21, a button 23, a spring 22 and a locking hole 111. The mounting seat 21 is locked on the inner side of the second flip shell 12 by a bolt 211. The button 23 can be moved up and down between the mounting seat 21 and the second flip shell 12 between a locking position and a release position. The button 23 includes an upwardly protruding pressing portion 231 and an outwardly extending locking arm 235. The locking arm 235 is formed with an upwardly protruding locking portion 232. A clearance hole 121 for avoiding the pressing portion 231 is formed on the second flip shell 12. In order to better guide the button 23 to move up and down The bottom of the button 23 is provided with two guide rods 234, 233 extending downward, and the mounting seat 21 is formed with a guide hole 212 for the guide rods 234, 233 to pass through. The spring sleeve 22 is arranged on the guide rod 234 and is compressed between the mounting seat 21 and the button 23, thereby driving the button 23 to move upward to the locking position. The locking hole 111 is formed on the first flip shell 11. When the first flip shell 11 and the second flip shell 12 are closed, the locking portion 232 is embedded in the locking hole 111 under the action of the spring 22, so that the first flip shell 11 and the second flip shell 12 cannot be opened. In order to facilitate the closing of the first flip shell 11 and the second flip shell 12, an inclined guide surface 2321 is formed on the locking portion 232, through which the first flip shell 11 and the second flip shell 12 can be smoothly closed and the locking portion 232 is automatically embedded in the locking hole 111 driven by the spring 22. When the housing 1 needs to be opened, the button 23 can be moved to the release position by pressing the button 23 , and the locking portion 232 is disengaged from the locking hole 111 , so that the first flip shell 11 and the second flip shell 12 can be opened.

[0052] The inner sides of the first flip shell 11 and the second flip shell 12 are each provided with a first mounting groove A for accommodating four counterweights 3. The outer circumferential surfaces of the four counterweights 3 are arranged closely in a matrix. Since the four counterweights 3 are arranged closely, the counterweights 3 will not shake. The first mounting groove A is surrounded by an annular side plate 14. The bottom of the first mounting groove A is formed with three second mounting grooves B adapted to the grip rod. The second mounting grooves B are surrounded by a plurality of rib plates 15. When the first flip shell 11 and the second flip shell 12 are closed, the four counterweights 3 on the first flip shell 11 and the four counterweights 3 on the second flip shell 12 are arranged opposite to each other and closely together, thereby preventing the counterweights 3 from shaking.

[0053] Reference Figures 8 to 17As shown, a dumbbell is assembled and composed of a first grip bar 62 and eight counterweights 3, wherein two counterweights 3 are provided with detachable connecting seats 4, and both ends of the first grip bar 62 are provided with connecting structures for detachable connection with the connecting seats 4. The first grip bar 62 is a tubular structure, and the connecting structure includes a mounting plate 623 arranged in the first grip bar 62, and the mounting plate 623 is provided with a screw hole 622. The connecting seat 4 is connected to the screw hole 622 through a bolt 624, and the bolt 624 is locked and connected with the screw hole 622 after passing through the connecting seat 4, and the connecting seat 4 is formed with a hole for the bolt 624 to pass through. The through hole 42 has a simple structure, is easy to operate and has low cost. A circular groove 44 is formed at one end of the connecting seat 4 to receive the end of the first gripping rod 62. The groove wall of the circular groove 44 is provided with a protruding positioning portion 45. A positioning notch 621 adapted to the positioning portion 45 is formed at the end of the first gripping rod 62, which can not only realize the rapid positioning of the first gripping rod 62 and the connecting seat 4, but also prevent the first gripping rod 62 from rotating relative to the connecting seat 4. An operating groove 43 for avoiding the nut of the bolt 624 is formed at the other end of the connecting seat 4. The operating groove 43 can avoid the nut and provide operating space.

[0054] A dovetail groove 32 is formed on one side of the counterweight block 3, one end of the dovetail groove 32 is closed and the other end is open to the outer peripheral surface of the counterweight block 3, a first plug-in portion 31 which can be adapted and plugged with the dovetail groove 32 is formed on the other side of the counterweight block 3, and the two adjacent counterweight blocks 3 are plugged and matched with the first plug-in portion 32 and the dovetail groove 32, and a locking mechanism for limiting the sliding of the first plug-in portion 32 relative to the dovetail groove 32 is provided on the counterweight block 3, and a second plug-in portion 41 which can be plug-in and matched with the dovetail groove 32 is formed on the other side of the connecting seat 4, and the locking mechanism can also limit the sliding of the second plug-in portion 41 relative to the dovetail groove 32, and the counterweight block 3 includes an outer shell 3a, an end cover 3b and a metal block 3c, one end of the outer shell 3a is open, the metal block 3c is arranged in the outer shell 3a, and the end cover 3b closes the opening of the outer shell 3a.

[0055] The locking mechanism includes a knob 71, a driving block 72, two sliders 73 and two springs 74. The outer peripheral surface of the counterweight block 3 is formed with a slide groove C for the two sliders 73 to slide and install the driving block 72 and the two springs 74. The driving block 72 can be rotatably set in the middle position of the slide groove C through the rotating shaft 721. The two sliders 73 can be slidably set on both sides of the driving block 72. The slider 73 is a plate-like structure, on which a notch 733 adapted to the spring 74 is formed. The spring 74 is set in the notch 733 and compressed between the slider 73 and the groove wall of the slide groove C. The moving direction of the slider 73 Perpendicular to the length direction of the dovetail groove 32, a cover plate 75 for sealing the slide groove C is provided on the counterweight block 3. Specifically, a buckle hole 33 is formed on the counterweight block 3, and a buckle 751 matching the buckle hole 33 is formed on the cover plate 75. The cover plate 75 is buckled and set on the counterweight block 3. The drive block 72 is rotatably set in the slide groove C through a rotating shaft. The slide groove C is provided with an axial hole C1 for the shaft to pass through. The shaft 721 of the drive block 72 passes through the cover plate 75, and the knob 71 is connected to the shaft 721. This structure facilitates the assembly of the product. The two sliders 73 can be in the locked position and the released position. The slider 73 is slidably arranged in the slide groove C between the two positions, the slider 73 has a limiting portion 731 that can extend into the dovetail groove, the limiting portions 731 of the two sliders 73 are arranged relatively, the first plug-in portion 31 is formed with a first limiting groove 311 adapted to the limiting portion 731, and the second plug-in portion 41 is also formed with a second limiting groove 411 of the same structure. When the slider 73 is in the locked position, the limiting portion 731 is embedded in the first limiting groove 311 to limit the first plug-in portion 31 from sliding relative to the dovetail groove 32. The two sides of the driving block 72 are formed with arc-shaped convex surfaces 722, and the two sliders 73 have There is an arcuate concave surface 732 matched with the arcuate convex surface. When the knob 71 drives the driving block 72 to rotate, the arcuate convex surface 722 and the arcuate concave surface 732 cooperate to drive the slider 73 to move to the release position, and the spring 74 drives the slider 73 to move to the locking position. When the slider 73 is in the release position, the limiting portion 731 disengages from the first limiting groove 311 so that the first plug-in portion 31 can slide relative to the dovetail groove 32. Through the above structure, the counterweight blocks 3 can be quickly disassembled and assembled, thereby adjusting the weight of the dumbbell, and the counterweight block 3 and the connecting seat 4 can also be quickly disassembled and assembled.

[0056] Reference Fig.18As shown, a barbell is different from a dumbbell only in that the middle bar for the exerciser to hold is different. The middle bar for the exerciser to hold is composed of two second grip bars 61, a first grip bar 62 and a third grip bar 63 connected by plugging. The second grip bar 61 and the third grip bar 63 are also tubular structures. One end of the third grip bar 63 is formed with a plug-in section 631 with a reduced diameter, and the other end is provided with a connection structure for detachable connection with the connection seat 4. The connection structure is the same as the connection structure of the first grip bar 62. A plug-in section 611 with a reduced diameter is formed at one end of the second grip 61, and the other end can be used for inserting the plug-in sections of other grips. The outer circumferential surfaces of the plug-in sections 631 and 611 are provided with retractable spring buckles 632 and 612. The second grip is provided with a buckle hole 613 for the spring buckles 632 and 612 to be embedded. The first grip 62 is also provided with a buckle hole for the spring buckle to be embedded. The first grip 62, the two second grips 61 and the third grip 63 are sequentially connected to form an intermediate rod for the exerciser to hold, thereby assembling into a barbell.

[0057] The above description is only a preferred embodiment of the present utility model, and therefore cannot be used to limit the scope of implementation of the present utility model. That is, equivalent changes and modifications made according to the scope of the patent application of the present utility model and the contents of the specification should still fall within the scope covered by the patent of the present utility model.

Claims

1. A multifunctional kettlebell, comprising a housing having a handle and a plurality of weight blocks, characterized in that: It also includes at least one grip bar for detachably assembling with a counterweight to form a dumbbell or a barbell. The shell includes two flip shells, which can be flipped between an open state and a closed state. The inner side of the flip shell is provided with a first mounting groove for placing the counterweight. The two flip shells in the closed state are relatively buckled to form a kettlebell, and the two flip shells in the open state are opened to store and retrieve the counterweight.

2. A multifunctional kettlebell according to claim 1, characterized in that: The inner side of the flip shell is provided with a plurality of the first installation grooves matched with the counterweight blocks, or the inner side of the flip shell is provided with one first installation groove matched with a plurality of the counterweight blocks closely arranged on the outer peripheral surface.

3. A multifunctional kettlebell according to claim 1, characterized in that: The inner side of the flip shell is provided with a first installation groove adapted to the four counterweight blocks, and the four counterweight blocks are arranged closely in a matrix.

4. The multifunctional kettlebell according to claim 1, characterized in that: The two flip shells have buckled edges that buckle relative to each other. The buckled edge of one flip shell is formed with an edge groove extending along its length direction, and the buckled edge of the other flip shell is formed with a convex edge extending along its length direction and matching the edge groove.

5. The multifunctional kettlebell according to claim 1, characterized in that: The shell body also includes a bottom shell, and the lower ends of the two flip shells are rotatably connected to the two sides of the bottom shell respectively.

6. A multifunctional kettlebell according to claim 5, characterized in that: The lower edges of the two flip shells in the closed state are matched and spliced ​​with the upper edges of the bottom shell, a receiving groove extending along the length direction is formed on the inner side of the lower edge of the flip shell, and a receiving protrusion matched with the receiving groove is formed on the inner side of the upper edge of the bottom shell.

7. The multifunctional kettlebell according to claim 5, characterized in that: The flip shell is rotatably connected to the bottom shell through a hinge mechanism, the hinge mechanism includes a first pivot seat, a second pivot seat and a connecting rod, the first pivot seat includes two first adapter plates arranged on the flip shell in parallel and opposite to each other, the second pivot seat includes two second adapter plates arranged on the bottom shell in parallel and opposite to each other, one end of the connecting rod is rotatably arranged between the two first adapter plates through a first pivot shaft, and the other end of the connecting rod is rotatably arranged between the two second adapter plates through a second pivot shaft.

8. The multifunctional kettlebell according to claim 7, characterized in that: The flip shell is rotatably connected to the bottom shell through the two hinge mechanisms. The two hinge mechanisms share a first pivot axis and a second pivot axis. The first pivot axis crosses the two first adapter plates of the two hinge mechanisms and one end of the connecting rod, and the second pivot axis crosses the two second adapter plates of the two hinge mechanisms and the other end of the connecting rod.

9. A multifunctional kettlebell according to any one of claims 1 to 8, characterized in that: It also includes a switch mechanism for keeping the two flip shells in a closed state, the switch mechanism includes a button, a spring and a locking hole, the button is movably arranged on one of the flip shells between a locking position and a release position, the spring is used to drive the button to move to the locking position, the button is provided with an upwardly protruding locking portion, the locking hole is provided on the other flip shell, when the button is in the locking position, the locking portion is embedded in the locking hole to limit the opening of the two flip shells, when the button is pressed to the release position, the locking portion is disengaged from the locking hole so that the two flip shells can be opened.

10. A multifunctional kettlebell according to any one of claims 1 to 8, characterized in that: The shell is in the shape of a kettlebell that is small at the top and large at the bottom.

11. A multifunctional kettlebell according to any one of claims 1 to 8, characterized in that: One half of the handle is formed on the upper end of one flip shell, and the other half of the handle is formed on the upper end of the other flip shell. When the two flip shells are closed, the upper end of the shell forms the handle.

12. A multifunctional kettlebell according to any one of claims 1 to 8, characterized in that: A dovetail groove is formed on one side of the counterweight block, with one end of the dovetail groove being closed and the other end being open to the outer peripheral surface of the counterweight block. A first plug-in portion that can be adapted to be plugged into the dovetail groove is formed on the other side of the counterweight block. Two adjacent counterweight blocks are plug-in-matched with the dovetail groove through the first plug-in portion. A locking mechanism is provided on the counterweight block to limit the sliding of the first plug-in portion relative to the dovetail groove.

13. A multifunctional kettlebell according to claim 12, characterized in that: The locking mechanism includes a knob, a driving block, a slider and a spring. The slider can be slidably arranged on the counterweight block between a locking position and a release position. The sliding direction of the slider is perpendicular to the length direction of the dovetail groove. The slider has a limiting portion that can extend into the dovetail groove. The first plug-in portion is formed with a first limiting groove that matches the limiting portion. When the slider is in the locking position, the limiting portion is embedded in the first limiting groove to limit the first plug-in portion from sliding relative to the dovetail groove. The driving block can be rotatably arranged on the counterweight block. The knob is connected to the driving block. The driving block has an arc-shaped convex surface. The slider has an arc-shaped concave surface that matches the arc-shaped convex surface. When the knob drives the driving block to rotate, the arc-shaped convex surface and the arc-shaped concave surface cooperate to drive the slider to the release position, and the spring drives the slider to the locking position.

14. A multifunctional kettlebell according to claim 13, characterized in that: The locking mechanism comprises two sliders located on both sides of the driving block and two springs driving the two sliders to slide to the locking position, and the limiting parts of the two sliders are arranged opposite to each other.

15. The multifunctional kettlebell according to claim 13, characterized in that: The outer peripheral surface of the counterweight block is formed with a slide groove for the sliding block to slide and install the driving block. The counterweight block is provided with a cover plate for covering the slide groove. The driving block is rotatably arranged in the slide groove through a rotating shaft, and the rotating shaft passes through the cover plate and is connected to the knob.

16. A multifunctional kettlebell according to any one of claims 1 to 8, characterized in that: A second mounting groove matched with the gripping rod is arranged on the inner side of the flip shell, and the second mounting groove is located below the first mounting groove.

17. The multifunctional kettlebell according to claim 12, characterized in that: It also includes a plurality of the grips for being assembled with the counterweights to form dumbbells or barbells, the grips being tubular structures, at least two of the counterweights being provided with detachable connecting seats, the connecting seats being provided with second plug-in portions which are plugged into dovetail grooves, both ends of at least one grip being provided with connecting structures for being detachably connected to the connecting seats, one end of at least one grip being provided with a plug-in section with a reduced diameter, and the other end being provided with a connecting structure for being detachably connected to the connecting seat, one end of at least one grip being provided with a plug-in section with a reduced diameter, and the other end being provided with plug-in sections of other grips being inserted into, a retractable spring buckle being provided on the outer circumference of the plug-in section, and a buckle hole for the spring buckle to be embedded in being provided on the grip.

18. The multifunctional kettlebell according to claim 17, characterized in that: The connection structure comprises a mounting plate arranged in the grip rod, the mounting plate is provided with screw holes, the connection seat is connected to the connection structure via bolts, and the bolts are locked and connected with the screw holes after passing through the connection seat.

19. The multifunctional kettlebell according to claim 17, characterized in that: The buckle hole is formed at one end of the gripping rod where the connecting structure is arranged.

20. The multifunctional kettlebell according to claim 18, characterized in that: A circular groove for receiving the end of the gripping rod is formed on the connecting seat, a protruding positioning portion is provided on the groove wall of the circular groove, and a positioning notch matched with the positioning portion is formed on the end of the gripping rod.

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