Dumbbell convenient to use

Abstract

The utility model relates to the field of fitness equipment, in particular to a dumbbell convenient to use, which comprises a hollow handle, the two handle rods extend into the inner side of the handle from the two ends of the handle respectively, and telescopic locking blocks are arranged at the outer ends of the handle rods. The two handle seats are hollow, and the end parts of the handles are rotatably mounted on the handle seats; the dumbbell pieces are provided with positioning grooves, and the locking blocks can extend into the positioning grooves after extending out of the handle rod; a base; the first driving mechanism drives the handle rod to move transversely, and the second driving mechanism drives the locking block to stretch out and draw back. According to the utility model, the telescopic locking blocks are arranged to fix the dumbbell sheets, so that the problems in the prior art are effectively solved.

Description

Technical Field

[0001] This utility model relates to the field of fitness equipment, and in particular to a dumbbell that is easy to use. Background Technology

[0002] Adjusting the number of dumbbell plates is an important function of dumbbells. A common method for adjusting the number of plates is an adjustable dumbbell disclosed in utility model patent application number 202223571361.0. By rotating the handle, the drive cylinder is rotated, which causes the split handle to extend and retract to pick up the plates inside the outer end of the split handle. Adjacent plates are connected by a plug-in structure.

[0003] During use, the applicant discovered that the existing dumbbells relied on the insertion structure of adjacent dumbbell plates for plate placement, which not only increased the difficulty of manufacturing the plates but also made aligning and inserting the plates challenging when placing the dumbbell on the base. Therefore, the applicant improved the dumbbell with adjustable plates. Utility Model Content

[0004] To solve the above-mentioned technical problems, this utility model provides a dumbbell that is easy to use. By setting a retractable locking block to fix the bell plate, the problems existing in the prior art are effectively solved.

[0005] To address the aforementioned problems, this utility model provides a convenient dumbbell, comprising: a handle, the handle being hollow; a handle assembly including two handles extending from both ends of the handle into the inner side of the handle, with retractable locking blocks at the outer ends of the handles; a handle base assembly including two handle bases located at both ends of the handle, the handle bases being hollow, with the ends of the handle rotatably mounted on the handle bases; a bell assembly including multiple bells that can be stacked on top of each other, each bell having a through hole through which the handle passes, the hole wall of the through hole having a positioning groove, the locking block extending out of the handle and able to extend into the positioning groove; and a base including two spaced-apart receiving grooves, the receiving grooves being able to accommodate multiple horizontally stacked bells, the space between the two receiving grooves forming a space for accommodating the handle base assembly and the handle assembly; wherein, the dumbbell further comprises a first drive mechanism for driving the handle to move laterally and a second drive mechanism for driving the locking block to extend and retract.

[0006] Furthermore, the locking block is rotatably mounted on the handle.

[0007] Furthermore, there are two locking blocks, with the rotation centers of the two locking blocks located on opposite sides of the center of the handle. The section of the locking block away from its rotation center forms a protrusion protruding towards the center of the handle, and the section of the locking block near its rotation center forms a recessed clearance groove. When the two locking blocks retract relative to the handle, the protrusion of one locking block is located in the clearance groove of the other locking block. The protrusion has an oblong drive through groove, and the second drive mechanism includes a drive rod rotatably mounted inside the handle, the drive rod having a drive shaft extending into the drive through groove.

[0008] Furthermore, the handle assembly also includes a cover plate, which is connected to the end of the handle via a connecting shaft, and the locking block is rotatably mounted on the connecting shaft.

[0009] Furthermore, the second driving mechanism includes a driving rod rotatably mounted inside the handle, the driving rod being able to extend and retract the lock block; a return spring is provided between the driving rod and the handle, the return spring providing the torque for the driving rod to extend the lock block; the second driving mechanism also includes a drive rod, the drive rod passing through the handle seat and extending to the position of the driving rod, and the drive rod being able to drive the driving rod to rotate so that the lock block retracts; the handle is provided with a driving groove extending along its length, and the drive rod passes through the driving groove through the handle.

[0010] Furthermore, the active rod abuts against the drive rod at a position offset from the rotation axis of the drive rod, so that the active rod can push the drive rod to cause the locking block to retract.

[0011] Furthermore, the active rod extends to the bottom of the handle base, the handle base has a through hole in the portion corresponding to the active rod, and the base has a top block in the position corresponding to the through hole. When the handle base is placed on the base, the top block can lift the active rod upward to drive the drive rod to rotate, so that the locking block retracts.

[0012] Furthermore, the handle base is provided with a sliding groove, and the active rod is slidably mounted in the sliding groove; the first drive mechanism is configured such that the outer surface of the handle rod is provided with a drive screw, the handle is rotatably mounted in the handle base, and the handle is provided with a drive block that cooperates with the drive screw.

[0013] Furthermore, the part of the handle that extends into the handle base is provided with a positioning ring, the driving block is disposed inside the positioning ring, the outer surface of the positioning ring is provided with marking portions at intervals along its circumference, the handle base is provided with a viewing window, and when the positioning ring rotates, the marking portions can be displayed one by one corresponding to the viewing window.

[0014] Furthermore, a mounting base is provided at the end of the handle away from the lock block, the drive rod is rotatably mounted on the mounting base, and the return spring includes a torsion spring disposed between the mounting base and the drive rod.

[0015] The beneficial effect of this utility model is that by setting a retractable locking block to fix the bell plate, the problems existing in the prior art are effectively solved. Attached Figure Description

[0016] The accompanying drawings, which are included to provide a further understanding of the present invention and constitute a part of this invention, illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain the present invention and do not constitute an undue limitation thereof. In the drawings:

[0017] Figure 1 This is a schematic diagram of an embodiment of the present invention (with part of the handle seat removed and the receiving groove at one end of the handle seat removed).

[0018] Figure 2 for Figure 1 The diagram shown is a structural schematic from another perspective.

[0019] Figure 3 This is a schematic diagram of the structure of one embodiment of the present invention, with one end of the handle serving as the handle and the driving rod.

[0020] Figure 4 for Figure 1 The illustrated embodiment is shown as a partial cross-sectional view of the structure at the center of one of the drive rods.

[0021] Figure 5 for Figure 4 Schematic diagram of the cross-sectional structure along the AA direction.

[0022] Figure 6 for Figure 2 The diagram shows the structure of the part shown (without the handle, one handle bar, and one handle base).

[0023] Figure 7 for Figure 6 A schematic diagram of the structure from another perspective after removing part of the handle.

[0024] The components are as follows: 1. Handle; 101. Positioning ring; 102. Marking part; 2. Handle rod; 201. Drive screw; 3. Locking block; 301. Protrusion part; 4. Handle seat; 5. Bell; 6. Positioning groove; 7. Base; 8. Receiving groove; 9. Clearance groove; 10. Drive through groove; 11. Drive rod; 1101. Drive shaft; 12. Cover plate; 13. Connecting shaft; 14. Return spring; 15. Active rod; 16. Drive groove; 17. Top block; 18. Slide groove; 19. Drive block; 20. Viewing window; 21. Mounting base. Detailed Implementation

[0025] To more clearly illustrate the overall concept of this utility model, a detailed description will be provided below with reference to the accompanying drawings.

[0026] It should be noted that many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed below.

[0027] Furthermore, it should be understood in the description of this utility model that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0028] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral unit; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. However, specifying a direct connection indicates that the two main bodies at the connection point are not connected by an intermediate structure, but are simply connected to form a whole through a connecting structure. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0029] In this utility model, unless otherwise expressly specified and limited, the first feature "on" or "below" the second feature may be in direct contact with the first and second features, or indirect contact through an intermediate medium. In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0030] In this utility model, such as Figure 1-7As shown, a convenient dumbbell is provided, comprising: a handle 1, which is hollow; a handle bar 2 assembly, comprising two handle bars 2, each extending into the inner side of the handle 1 from both ends, with a retractable locking block 3 at the outer end of each handle bar 2; a handle base 4 assembly, comprising two handle bases 4 located at both ends of the handle 1, the handle bases being hollow, and the ends of the handle 1 being rotatably mounted on the handle bases 4; and a weight plate 5 assembly, comprising multiple weight plates that can be stacked on top of each other. The dumbbell has a bell 5 with a through hole through which the handle 2 passes. The wall of the through hole is provided with a positioning groove 6. The locking block 3 can extend into the positioning groove 6 after extending out of the handle 2. The base 7 includes two spaced-apart receiving grooves 8, which can accommodate multiple horizontally stacked bells 5. The space between the two receiving grooves 8 is used to accommodate the handle base 4 assembly and the handle 2 assembly. The dumbbell is also provided with a first drive mechanism to drive the handle 2 to move laterally and a second drive mechanism to drive the locking block 3 to extend and retract.

[0031] When using the dumbbell of this utility model, as shown in the figure, the dumbbell plates 5 are horizontally stacked in the receiving groove 8 of the base 7. When it is necessary to adjust the number of dumbbell plates 5, the second drive mechanism drives the locking block 3 to retract, so that the first drive mechanism can drive the outer end of the handle 2 to move to the position of the positioning groove 6 of different dumbbell plates 5. When adjusted to the set positioning groove 6 of the dumbbell plate 5, the second drive mechanism can drive the locking block 3 to extend. At this time, the user can lift it by holding the handle 1.

[0032] The dumbbell of this invention supports the dumbbell 5 by inserting the handle 2 into the through hole of the dumbbell 5. After the locking block 3 extends out, it is positioned in the positioning groove 6 of the corresponding position of the dumbbell 5 to fix the position of the outermost dumbbell 5, thereby fixing the dumbbell 5. Compared with the existing structure of dumbbell 5 that is inserted into each other radially, this invention eliminates the need for a connecting structure between adjacent dumbbell 5, which simplifies the structure of the dumbbell 5, reduces the processing difficulty of the dumbbell 5, and also reduces the difficulty of aligning the dumbbell 5 when putting it back into the receiving groove 8, effectively solving the problems in the prior art.

[0033] In a preferred embodiment, more specifically regarding the structure of this utility model, the locking block 3 is rotatably mounted on the handle 2.

[0034] Alternatively, in an alternative embodiment, the locking block 3 can also be installed on the handle 2 in a linearly movable manner. In one specific embodiment, a groove 18 can be provided at the end of the handle 2, and the locking block 3 can be slidably disposed in the groove 18. The second drive mechanism includes a drive gear that meshes with the locking block 3, and the drive rod 11 is coaxially connected to the drive gear.

[0035] In the illustrated embodiment, for the rotatable mounting structure of the locking block 3, more specifically, there are two locking blocks 3, with the rotation centers of the two locking blocks 3 located on both sides of the center of the handle 2; the section of the locking block 3 away from its rotation center forms a protrusion 301 protruding towards the center of the handle 2, and the section of the locking block 3 near its rotation center forms a recessed clearance groove 9; when the two locking blocks 3 retract relative to the handle 2, the protrusion 301 of one locking block 3 is located in the clearance groove 9 of the other locking block 3; the protrusion 301 is provided with an oblong driving through groove 10, and the second driving mechanism includes a driving rod 11 rotatably mounted inside the handle 2, the driving rod 11 having a driving shaft 1101 extending into the driving through groove 10.

[0036] As shown in the figure, by setting two locking blocks 3, with the rotation centers of the locking blocks 3 located on both sides of the center of the handle 2, the locking blocks 3 can extend symmetrically from the handle 2 when rotating, thus ensuring that the locking blocks 3 are evenly and stably fixed in the positioning groove 6. By setting the protrusion 301 and the clearance groove 9, sufficient space is provided for the arrangement of the drive through groove 10, which not only facilitates the arrangement of the drive through groove 10 but also increases the cross-sectional area of ​​the locking blocks 3 at the position of the drive through groove 10, thereby improving the structural strength of the locking blocks 3 at the position of the drive through groove 10.

[0037] In the illustrated embodiment, the drive shaft 1101 is driven to rotate by the drive rod 11, and the drive shaft 1101 moves within the drive through groove 10 to actuate the extension and retraction of the lock block 3.

[0038] The rotatable installation method of the locking block 3 is not limited to the two locking blocks 3 shown in the figure, or the setting method in which the rotation center of the locking block 3 is offset from the center of the handle 2. In optional embodiments, other settings can also be adopted. For example, in one embodiment, the cross section of the handle 2 is an elliptical cross section or a rectangular cross section, and the locking block 3 is hinged to the geometric center position of the handle 2, so that the locking block 3 can rotate out of the handle 2.

[0039] In the illustrated embodiment, regarding the structure of this utility model, the installation method of the locking block 3 is further specifically described as follows: the handle 2 assembly also includes a cover plate 12, which is connected to the end of the handle 2 via a connecting shaft 13, and the locking block 3 is rotatably mounted on the connecting shaft 13.

[0040] In an embodiment where the second drive mechanism employs a rotatable drive rod 11 disposed within the handle 2, and further detailed with reference to the accompanying drawings, regarding a rotational drive method for the drive rod 11, the second drive mechanism includes a drive rod 11 rotatably mounted inside the handle 2, the drive rod 11 being capable of extending and retracting the locking block 3; a return spring 14 is provided between the drive rod 11 and the handle 2, the return spring 14 providing the torque for the drive rod 11 to extend the locking block 3; the second drive mechanism also includes an active rod 15, the active rod 15 passing through the handle seat 4 and the handle 2 extending to the position of the drive rod 11, and the active rod 15 being capable of driving the drive rod 11 to rotate so that the locking block 3 retracts; the handle 2 is provided with a drive groove 16 extending along its length direction, the active rod 15 passing through the drive groove 16 through the handle 2.

[0041] As shown in the figure, in its natural state, the return spring 14 drives the drive rod 11 to rotate relative to the handle 2, keeping the locking block 3 extended, thus allowing the locking block 3 to stably fix the outermost bell 5. When the position of the locking block 3 needs to be adjusted, the active rod 15 can be moved by external force, causing the active rod 15 to drive the drive rod 11 to rotate, thereby causing the locking block 3 to retract. At this time, the first drive mechanism can drive the handle 2 to move, thereby adjusting the position of the locking block 3 between the bell 5. Moreover, as shown in the figure, by providing a drive groove 16 on the handle 2, the active rod 15 can move relative to the handle 2 within the drive groove 16 during the extension and retraction of the handle 2 to adjust the position of the locking block 3 between the bell 5.

[0042] In the structure with drive rod 11, the rotation drive method of drive rod 11 can be other methods in alternative embodiments, such as setting a servo motor connected to drive rod 11 on the inner side of handle 2, and driving drive rod 11 to rotate through servo motor.

[0043] In the illustrated embodiment, for the structure in which the active rod 15 drives the drive rod 11 to rotate, more specifically, the active rod 15 abuts against the drive rod 11 at a position offset from the rotation axis of the drive rod 11, so that the active rod 15 can push the drive rod 11 to cause the locking block 3 to retract.

[0044] As shown in the figure, when it is necessary to drive the drive rod 11 to rotate via the drive rod 15, the drive rod 15 can be pushed to rotate the drive rod 11, causing the locking block 3 to retract. When the drive rod 15 loses external force, the drive rod 11 returns to its original position under the action of the return spring 14, causing the locking block 3 to extend.

[0045] Regarding the rotational engagement between the drive rod 15 and the driving rod 11, other forms may be adopted in alternative embodiments. In one embodiment, a gear may be provided on the driving rod 11, and a rack may be provided on the drive rod 15 to mesh with the gear on the driving rod 11.

[0046] In the illustrated embodiment, more specifically regarding the structure of this utility model, the active rod 15 extends to the bottom of the handle 4, the handle 4 has a through hole in the part corresponding to the active rod 15, and the base 7 has a top block 17 in the position corresponding to the through hole. When the handle 4 is placed on the base 7, the top block 17 can lift the active rod 15 upwards to drive the drive rod 11 to rotate, so that the locking block 3 retracts.

[0047] As shown in the figure, by setting up a top block 17, when the handle 1 is placed on the base 7, the top block 17 can be used to push the active rod 15 upward, so that the active rod 15 drives the drive rod 11 to rotate and cause the locking block 3 to retract. When the handle 1 is lifted upward and removed from the base 7, the drive rod 11 can rotate under the action of the return spring 14, and the drive rod 11 drives the locking block 3 to extend automatically. With this setting, the extension and retraction of the locking block 3 can be linked with the lowering and removal of the handle 1 from the base 7.

[0048] The driving method of the active lever 15 is not limited to the form shown in the figure. In optional embodiments, other methods can also be used. For example, in one embodiment, the active lever 15 extends from the top of the handle 1 seat, and the operator can manually push and pull the active lever 15 to drive the drive rod 11 to rotate. In another embodiment, the active lever 15 can be set to be threaded onto the handle 1 seat, and the operator can rotate the active lever 15 so that the active lever 15 pushes the drive rod 11 to drive the locking block 3 to retract.

[0049] In the embodiment where the linear movement of the active rod 15 drives the rotation of the drive rod 11, a further optimization of the installation of the active rod 15 is that the handle base 4 is provided with a sliding groove 18, and the active rod 15 is slidably installed in the sliding groove 18; the first drive mechanism is configured such that the outer surface of the handle 2 is provided with a drive screw 201, the handle 1 is rotatably installed in the handle base 4, and the handle 1 is provided with a drive block 19 that cooperates with the drive screw 201.

[0050] As shown in the figure, the end of the handle 1 extends into the inner side of the handle base 4. A positioning ring 101 is provided on the portion of the handle 1 extending into the handle base 4. The positioning ring 101 has a driving block 19 that cooperates with the driving screw 201. The driving rod 15 is laterally limited by the handle base 4 through a sliding groove 18. The driving rod 15 passes through the driving groove 16 of the handle 2, allowing the driving rod 15 to guide the handle 2 within the driving groove 16. This enables the handle 1 to drive the handle 2 to extend and retract during rotation via the cooperation of the driving block 19 and the driving screw 201. Therefore, the driving rod 15 of this invention not only performs a transmission drive function in the second drive mechanism but also constrains the handle 2 in the first drive mechanism, serving a dual purpose and further optimizing the dumbbell's structure.

[0051] The configuration of the first drive structure is not limited to the method shown in the figure where the handle 1 moves the handle 2 by a screw. In optional embodiments, other methods can also be used. For example, an electric telescopic rod can be provided in the handle 1, and the telescopic section of the electric telescopic rod can be connected to the handle 2 to drive the handle 2 to move. Another example is that a groove 18 extending along the length of the handle 1 can be provided, and the handle 2 can be provided with a slidable protrusion in the groove 18. The user moves the handle 2 by manipulating the protrusion.

[0052] In the illustrated embodiment, more specifically regarding the structure of this utility model, the part of the handle 1 that extends into the handle base 4 is provided with a positioning ring 101, the driving block 19 is disposed on the inner side of the positioning ring 101, the outer surface of the positioning ring 101 is provided with marking portions 102 at intervals along its circumference, the handle base 4 is provided with a viewing window 20, and when the positioning ring 101 rotates, the marking portions 102 can be displayed one by one corresponding to the viewing window 20.

[0053] As shown in the figure, the rotation angle of the handle 1 can be displayed in the window 20 through the marking part 102 of the positioning ring 101. Furthermore, the correspondence between the rotation angle of the handle 1 and the extension position of the lever 2 can be used to characterize the extension length of the lever 2 in the locking block 3 part through the marking part 102, so as to facilitate the control of the extension of the lever 2.

[0054] In the illustrated embodiment, specifically regarding the arrangement of the positioning groove 6, as shown in the figure, the positioning groove 6 is open on the outer side of the bell slat 5, that is, the positioning groove 6 is formed by enlarging the entire hole at the outer section of the through hole, which can further simplify the processing method of the bell slat 5. In an optional embodiment, the positioning groove 6 can also be provided in the middle of the through hole.

[0055] The various embodiments in this specification are described in a progressive manner. Similar or identical parts between embodiments can be referred to interchangeably. Each embodiment focuses on its differences from other embodiments. In particular, the system embodiments are basically similar to the method embodiments, so the description is relatively simple; relevant parts can be referred to the descriptions in the method embodiments.

[0056] The above description is merely an embodiment of this application and is not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.

Claims

1. A dumbbell for ease of use, characterized in that The dumbbell comprises: a handle, which is hollow; a handle rod assembly, which comprises two handle rods, each of which extends into the handle from one end of the handle, and the outer end of each handle rod is provided with a retractable locking block; a handle seat assembly, which comprises two handle seats, each of which is located at one end of the handle, and each handle seat is hollow, and the end of the handle is rotatably mounted in the handle seat; a bell piece assembly, which comprises a plurality of bell pieces that can be stacked transversely, each bell piece has a through hole through which the handle rod passes, and the hole wall of the through hole is provided with a positioning groove, and the locking block can extend into the positioning groove after extending out of the handle rod; a base, which comprises two spaced accommodating grooves, each of which can accommodate a plurality of transversely stacked bell pieces, and the space between the two accommodating grooves can accommodate the handle seat assembly and the handle rod assembly; wherein the dumbbell is further provided with a first driving mechanism for driving the handle rod to move transversely and a second driving mechanism for driving the locking block to retract and extend.

2. The ready-to-use dumbbell of claim 1, wherein, The locking block is rotatably mounted on the handle rod.

3. The ready-to-use dumbbell of claim 2, wherein, The locking block is provided with two locking blocks, and the rotation centers of the two locking blocks are respectively located on both sides of the center of the handle rod; a section of the locking block away from the rotation center forms a protruding block part protruding toward the center of the handle rod, and a section of the locking block close to the rotation center forms an inwardly recessed avoiding groove; when the two locking blocks are retracted relative to the handle rod, the protruding block part of one of the locking blocks is located in the avoiding groove of the other locking block. The protruding block part is provided with a waist-shaped driving through groove, and the second driving mechanism comprises a driving rod rotatably mounted on the inner side of the handle rod, and the driving rod has a driving shaft extending into the driving through groove.

4. The ready-to-use dumbbell of claim 2 or 3, wherein, The handle rod assembly further comprises a cover plate connected to the end of the handle rod by a connecting shaft, and the locking block is rotatably mounted on the connecting shaft.

5. The ready-to-use dumbbell of claim 1, wherein, The second driving mechanism comprises a driving rod rotatably mounted on the inner side of the handle rod, and the driving rod can drive the locking block to retract and extend; A return spring is provided between the driving rod and the handle rod, and the return spring provides a torque for the driving rod to drive the locking block to extend out; The second driving mechanism further comprises a driving rod, which extends through the handle seat and the handle rod to the position of the driving rod, and the driving rod can drive the driving rod to rotate to retract the locking block; The handle rod is provided with a driving groove extending along the length direction of the handle rod, and the driving rod extends through the handle rod through the driving groove.

6. The ready-to-use dumbbell of claim 5, wherein, The driving rod is in abutment with the driving rod at a position deviating from the rotation axis of the driving rod, so that the driving rod can push the driving rod to retract the locking block.

7. The ready-to-use dumbbell of claim 5, wherein, The driving rod extends to the bottom of the handle seat, the handle seat is provided with a through hole at a position corresponding to the driving rod, and the base is provided with a top block at a position corresponding to the through hole, and when the handle seat is placed on the base, the top block can lift the driving rod to drive the driving rod to rotate, so that the locking block retracts.

8. The ready-to-use dumbbell of claim 5, wherein, The handle seat is provided with a sliding groove, and the driving rod is slidably mounted in the sliding groove. The first driving mechanism is arranged as follows: the outer side of the handle is provided with a driving screw, the handle is rotatably arranged on the handle base, and the handle is provided with a driving block matched with the driving screw.

9. The ready-to-use dumbbell of claim 8, wherein, The part of the handle extending into the handle base is provided with a positioning ring, the driving block is arranged on the inner side of the positioning ring, the outer surface of the positioning ring is provided with mark parts at intervals along the circumference thereof, the handle base is provided with a window, and the mark parts can be displayed one by one through the window when the positioning ring rotates.

10. The ready-to-use dumbbell of claim 5, wherein, The end of the handle away from the lock block is provided with a mounting base, the driving rod is rotatably arranged on the mounting base, and the reset spring comprises a torsion spring arranged between the mounting base and the driving rod.

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