A dumbbell and its base

Abstract

The utility model discloses a dumbbell and base belong to sports equipment technical field, that dumbbell and base, including dumbbell main part, the dumbbell main part includes handlebar, and both ends of handlebar are provided with the gear shifting assembly, and the gear shifting assembly includes the driving wheel connected in the both ends of handlebar, and the end face of driving wheel away from handlebar is circular array and is provided with a plurality of hanging block, and the end face of driving wheel away from handle bar still is sequentially provided with counterweight half ring and connecting steel sheet, and the bottom of counterweight half ring is provided with cooperation protruding block, and hanging block can be hung with cooperation protruding block, and the side of connecting steel sheet away from counterweight half ring is sequentially and side by side and is connected with a plurality of assembly piece. The utility model discloses a driving wheel and the cooperation structure of hanging block, realize counterweight half ring and the quick hanging of dumbbell main part and separate, make the disassembly of dumbbell counterweight unit more convenient, and through the side by side design of connecting steel sheet and assembly piece, provide modularization extension base for subsequent stepless weight gain, improve the counterweight flexibility and use efficiency of dumbbell.

Description

Technical Field

[0001] This utility model belongs to the field of sports equipment technology, specifically relating to a dumbbell and its base. Background Technology

[0002] Dumbbells, a type of fitness equipment with a long history, can be traced back to ancient Greece. Initially used as a handheld device to increase reaction force in long jump competitions, they have gradually evolved into a core tool for modern strength training. Their structure mainly consists of handles and weight units on both sides. By resisting resistance, they enhance muscle strength and improve motor function, and are widely used in strength training, compound muscle movement training, and rehabilitation therapy.

[0003] The existing dumbbell counterweight installation mainly adopts a modular design, which realizes weight adjustment through detachable components. These include bolt-fixed types, which use connectors and bolts to connect the handle body and the counterweight blocks in series. The bolts pass through the counterweight blocks and connectors in sequence and are locked with the threaded holes at the end of the handle to form a stable integrated structure. Alternatively, there are plate-shaped counterweight types, which use multiple independent dumbbell plates stacked together to form a counterweight unit, which is fitted onto the counterweight bar and fixed to the counterweight connecting seats at both ends of the handle by a locking mechanism (such as a push switch and an arc-shaped locking plate). The locking mechanism maintains the locked state through elastic elements (such as springs).

[0004] However, existing dumbbell weight installation structures still have flaws. Plate weight designs rely on fixed weight plates (each typically weighing 1,000-10,000 kg), allowing only large increments (e.g., multiples of 1 kg) to increase or decrease weight. This fails to meet users' needs for fine resistance adjustments (e.g., 0.5 kg increments), making it difficult to accurately match training intensity to individual abilities. Weight adjustment requires manual disassembly and reassembly of multiple components, such as removing bolts, adding or removing dumbbell plates, and re-tightening. Furthermore, ensuring balance on both sides requires repeated operations, which is time-consuming and labor-intensive. Some push-button locking mechanisms require pressing or rotating at specific angles, resulting in poor operational continuity. Utility Model Content

[0005] The technical problem to be solved by this utility model is to overcome the shortcomings of the prior art and provide a dumbbell and its base.

[0006] The technical solution adopted to solve the above technical problems is: to provide a dumbbell and its base, including a dumbbell body, characterized in that the bottom surface of the dumbbell body is provided with a base, the dumbbell body includes a handle, and both ends of the handle are provided with adjustment components; The gear shifting assembly includes a drive wheel connected to both ends of the throttle, a scale wheel rotatably connected to the outer wall of the drive wheel, a drive gear fixed to the end face of the drive wheel near the throttle, an internal gear ring fixed to the inner ring of the scale wheel, and two inert gears meshing between the drive gear and the internal gear ring. The end face of the drive wheel away from the throttle is arranged in a circular array with multiple hooking protrusions. The end face of the drive wheel away from the throttle is also arranged with a counterweight half ring and a connecting steel plate in sequence. The bottom surface of the counterweight half ring is provided with a mating protrusion, and the hooking protrusion can be hooked with the mating protrusion. Multiple assembly pieces are sequentially connected side-by-side on the side of the connecting steel sheet away from the counterweight semi-ring.

[0007] Through the above technical solution, by setting up a cooperative structure between the active wheel and the hooking protrusion, the quick attachment and separation of the counterweight half ring and the dumbbell body are realized, solving the problem of cumbersome disassembly and assembly of traditional dumbbell counterweight units; at the same time, through the parallel design of the connecting steel plate and the assembly plate, a modular expansion basis is provided for subsequent stepless weight addition, which significantly improves the counterweight flexibility and usage efficiency of the dumbbell.

[0008] Furthermore, both ends of the throttle are movably fitted with protective covers, the drive wheel and the scale wheel are both located inside the protective covers, the outer wall of the protective cover has a display opening corresponding to the scale number of the scale wheel, the end of the protective cover away from the throttle is provided with a fixed end cover, the counterweight half ring and the fixed end cover are combined to form a disc structure, and the connecting steel plate, the fixed end cover and the protective cover are detachably installed by bolts.

[0009] The above technical solution forms a closed protection through the combination of the protective cover and the fixed end cover, effectively isolating sweat and dust from corroding the internal gear system (such as inert gears and scale wheels), thus extending the equipment's lifespan. The display port design allows users to intuitively read the gear position information of the scale wheel, avoiding misoperation. The detachable bolt connection simplifies the maintenance process and improves the maintainability of the components.

[0010] Furthermore, the top and bottom ends of the connecting steel sheet and the assembly piece are slidably engaged with locking heads. One side of the locking head is provided with a tapered dovetail groove, and the other side is a tapered dovetail protrusion. Adjacent locking heads can slide up and down to engage.

[0011] Through the above technical solution, the tapered dovetail groove and the bidirectional sliding engagement design of the chuck head enable quick locking and axial positioning between the assembly pieces, solving the problem of shaking when the counterweight pieces are stacked. This structure remains stable under load, preventing accidental detachment during training, while simplifying the assembly process of the counterweight components and improving user convenience.

[0012] Furthermore, the inertial gear is rotatably connected to the inside of the cover. The end face of the drive wheel near the throttle has multiple gear slots arranged in a circular array. The side of the inertial gear near the drive wheel has a connecting groove. A positioning bead is slidably arranged inside the connecting groove. A first spring is fixed between the positioning bead and one side of the inner wall of the connecting groove. The positioning bead abuts against the inside of the corresponding gear slot.

[0013] Through the above technical solution, the elastic cooperation mechanism between the positioning bead and the gear slot generates tactile feedback (such as sound) and mechanical positioning through the elastic force of the first spring when the drive wheel rotates, allowing the user to perceive gear shifting without visual inspection, thus solving the positioning deviation problem during blind operation; at the same time, this design reduces the processing accuracy requirements of the gear shifting component and reduces manufacturing costs.

[0014] Furthermore, an external gear ring is fixed to the outer wall of the drive wheel, and the external gear ring is located inside the scale wheel. A locking seat is also movably fitted on the outer wall of the drive wheel. The locking seat is attached to the side of the scale wheel away from the throttle. A locking groove is opened inside the locking seat. A locking block is slidably arranged inside the locking groove. A second spring is fixed between the locking block and one side of the inner wall of the locking groove. One side of the locking block is provided with teeth that mesh with the external gear ring. The locking block can slide to the external gear ring and engage to lock the drive wheel. Two trigger seats are provided on the top surface of the base. An avoidance opening is opened on the outer wall of the cover corresponding to the position of the locking block.

[0015] Through the above technical solution, the constant meshing design of the locking block and the external gear ring locks the drive wheel in the non-adjustment state, preventing accidental weight switching caused by accidental touch during training; the trigger seat of the base automatically unlocks by pressing the locking block against the clearance port, ensuring that the adjustment function is only activated when the dumbbell is placed on the base, thus improving the safety of the equipment and the rationality of the operating logic.

[0016] Furthermore, the throttle handle has two through-shafts slidably mounted inside. Both through-shafts are semi-circular shafts and can slide towards both ends of the throttle handle. Connecting steel plates and assembly plates are movably sleeved on the outer wall of the through-shafts. The fixed end cap extends into the interior of the drive wheel from one end near the protective cover. A driven wheel is rotatably connected to the end of the fixed end cap extending into the drive wheel. Multiple drive balls are fixed in a circular array on the outer wall of the driven wheel. Multiple arc-shaped straight grooves and multiple arc-shaped inclined grooves are formed in a circular array on the inner wall of the drive wheel. The circular arc grooves are staggered. Multiple drive balls on the driven wheel near the inner wall of the driving wheel are slidably connected to the inner wall of the circular arc groove. Multiple drive circular grooves are formed in a straight array on the outer wall of the through shaft. Multiple drive balls on the driven wheel away from the circular arc groove are movably inserted into the drive circular groove. A connecting groove 2 is formed on the inner wall of the fixed end cover at the position corresponding to the drive circular groove. A stop ball is slidably arranged inside the connecting groove 2. A third spring is fixed between the stop ball and the inner wall of the connecting groove 2. The stop ball abuts against the inside of the corresponding drive circular groove.

[0017] Through the above technical solution, the worm gear transmission design of the arc groove and drive ball is used to convert the rotational motion of the drive wheel into the linear displacement of the through shaft, realizing the step-by-step expansion of the counterweight plates. The staggered arc straight groove and arc inclined groove ensure that the first rotation only connects the basic counterweight (counterweight half ring), and the drive assembly plate is added after the second rotation, which solves the problem of the fixed position limitation of traditional dumbbells and meets the user's progressive training needs.

[0018] Furthermore, a locking nut is rotatably connected to the side of the drive gear near the throttle, the locking nut is threaded to the throttle, and limit notches are provided at both ends of the throttle. The inner wall of the drive wheel is provided with a limit protrusion that slides and engages with the limit notch, so that the drive wheel rotates with the throttle and prevents the locking nut from rotating with it.

[0019] The above technical solution ensures that the drive wheel always rotates synchronously with the throttle by sliding the limiting protrusion and the notch of the throttle, thus avoiding transmission failure. The threaded fixing mechanism of the locking nut prevents the drive gear from loosening during gear shifting, improves the stability of the gear transmission chain, and reduces the risk of failure caused by component displacement from the root.

[0020] The beneficial effects of this utility model are as follows: The integrated gear transmission system and modular counterweight structure significantly improve the accuracy and reliability of counterweight adjustment. The transmission chain, consisting of the drive wheel, inertial gear, and internal gear ring, precisely converts the rotational motion of the throttle into the angular displacement of the scale wheel. Users can confirm the gear position in real time through the display port on the cover, avoiding the misreading problems caused by relying on external markings in traditional dumbbells. Simultaneously, the elastic fit design of the positioning bead and the gear slot provides tactile and audible feedback through sound during gear shifting, solving the positioning deviation problem during blind operation. The hook-and-loop connection between the counterweight half-ring and the hooking protrusion, combined with the automatic unlocking mechanism of the base trigger seat against the locking block, enables tool-free quick assembly and disassembly of the counterweight unit, greatly reducing mechanical complexity, minimizing potential failure points, and extending equipment lifespan.

[0021] By employing a phased transmission control strategy, during the initial rotation of the throttle, the arc-shaped groove on the inner wall of the driving wheel constrains the drive ball of the driven wheel to slide linearly, keeping the mandrel in its original position. At this time, the engaging protrusion drives only a single counterweight half-ring to complete the basic counterweight. Upon subsequent rotation, the drive ball slides into the arc-shaped inclined groove, generating an oblique force that pushes the driven wheel to rotate and causes the mandrel to extend outward, simultaneously releasing the engagement of the counterweight half-ring and providing space for the addition of mounting plates. This process, combined with the tapered dovetail groove bidirectional engagement design of the clamp head, achieves stepless incremental counterweight expansion. Users can accumulate multiple mounting plates through multiple rotations, breaking through the limitations of traditional fixed dumbbell positions and meeting the needs of progressive training.

[0022] The constant meshing design of the locking seat and the external gear ring, combined with the linkage unlocking mechanism of the base trigger seat, ensures that the dumbbell can only be adjusted when placed on the base, effectively preventing accidental weight switching during training. The closed structure formed by the cover and the fixed end cap isolates the gear system from external contact, preventing corrosion from sweat and obstruction by foreign objects. The semi-circular shaft structure of the through-shaft and the sliding limit characteristics of the chuck ensure that the assembly plate remains axially stable under load, eliminating the risk of weight wobbling. In addition, the engagement of the limit notch of the throttle and the limit protrusion inside the drive wheel prevents the locking nut from loosening during rotation, ensuring the structural rigidity and operational safety of the transmission components during long-term operation. Attached Figure Description

[0023] Figure 1 This is a three-dimensional structural diagram of a dumbbell and its base according to the present invention; Figure 2 This is a three-dimensional disassembled structural diagram of a dumbbell and its base according to the present invention; Figure 3 This is a three-dimensional sectional view of the dumbbell body and its base according to the present invention. Figure 4 for Figure 1 A planar sectional view of the three-dimensional structure along the AA direction; Figure 5 This is a three-dimensional structural diagram of the active wheel of a dumbbell and its base according to the present invention.

[0024] Reference numerals: 1. Dumbbell body; 101. Base; 102. Turbo handle; 2. Drive wheel; 201. Scale wheel; 202. Drive gear; 203. Internal gear ring; 204. Inertial gear; 205. Hooking protrusion; 206. Counterweight half ring; 207. Connecting steel plate; 208. Mating protrusion; 209. Assembly plate; 3. Protective cover; 301. Fixed end cover; 4. Clamp; 5. Stop groove; 501. Connecting groove one; 5 02. Positioning bead; 503. First spring; 6. External gear ring; 601. Locking seat; 602. Locking groove; 603. Locking block; 604. Second spring; 605. Trigger seat; 7. Through shaft; 701. Driven wheel; 702. Drive ball; 703. Circular arc straight groove; 704. Circular arc inclined groove; 705. Drive circular groove; 706. Connecting groove two; 707. Gear ball; 708. Third spring; 8. Locking nut. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0026] like Figure 1-5As shown, this embodiment of a dumbbell and its base includes a dumbbell body 1, a base 101 on the bottom surface of the dumbbell body 1, a handle 102, and adjustment components at both ends of the handle 102. Each adjustment component includes a drive wheel 2 connected to both ends of the handle 102. A scale wheel 201 is rotatably connected to the outer wall of the drive wheel 2. A drive gear 202 is fixed to the end face of the drive wheel 2 near the handle 102. An inner ring of the scale wheel 201 is fixed with an inner... The gear ring 203 has two inertial gears 204 meshing with the drive gear 202 and the internal gear ring 203. The end face of the drive wheel 2 away from the throttle 102 has multiple engagement protrusions 205 arranged in a circular array. The end face of the drive wheel 2 away from the throttle 102 also has a counterweight half-ring 206 and a connecting steel plate 207 arranged sequentially. The bottom surface of the counterweight half-ring 206 has a mating protrusion 208. The engagement protrusions 205 can engage with the mating protrusions 208. All mating protrusions 208... The structure features an "L"-shaped locking strip, with the hooking protrusion 205 being a straight strip. Multiple assembly plates 209 are sequentially connected side-by-side on the side of the connecting steel plate 207 furthest from the counterweight half-ring 206. When the throttle 102 is rotated for the first time, the drive wheel 2 rotates the hooking protrusion 205 until it engages with the mating protrusion 208 of the counterweight half-ring 206, fixing the counterweight half-ring 206 to the dumbbell body 1 and completing the basic counterweight. Upon subsequent rotation, the hooking protrusion 205 disengages from the mating protrusion 208, at which point the assembly plates 209 are added to achieve secondary counterweight. The hooking design of the drive wheel 2's hooking protrusion 205 and the mating protrusion 208 of the counterweight half-ring 206 enables quick assembly and disassembly of the counterweight unit and locking of the basic counterweight, solving the cumbersome problem of manually tightening or inserting pins when changing counterweight plates in traditional dumbbells. The side-by-side structure of the connecting steel plate 207 and the assembly plates 209 provides a modular expansion foundation for subsequent stepless weight addition, significantly improving counterweight flexibility and training efficiency.

[0027] Both ends of the throttle 102 are movably fitted with protective covers 3. The drive wheel 2 and the scale wheel 201 are both located inside the protective covers 3. The outer wall of the protective covers 3 has a display opening corresponding to the scale number of the scale wheel 201. A fixed end cap 301 is provided at the end of the protective covers 3 away from the throttle 102. The counterweight half ring 206 and the fixed end cap 301 are combined vertically to form a disc structure. The connecting steel plate 207, the fixed end cap 301 and the protective covers 3 are detachably installed by bolts. During installation, the protective covers 3 are fitted onto both ends of the throttle 102, and the fixed end cap 301 is fixed. The cover 3 and connecting steel plate 207 are secured with bolts; the counterweight half ring 206 is inserted between the cover 3 and the connecting steel plate 207, and combined with the fixed end cover 301 to form a disc structure. The closed structure formed by the cover 3 and the fixed end cover 301 isolates sweat and dust from corroding the internal gear system such as the scale wheel 201 and the inertial gear 204, thus extending the equipment's lifespan; the display port design allows users to intuitively read the gear position of the scale wheel 201, avoiding misoperation; the detachable bolt connection simplifies the maintenance process and improves the maintainability and assembly efficiency of the components.

[0028] Both the top and bottom ends of the connecting steel plate 207 and the assembly plate 209 are slidably engaged with locking heads 4. One side of the locking head 4 is provided with a tapered dovetail groove, and the other side is a tapered dovetail protrusion. Adjacent locking heads 4 can slide up and down to engage. When adding weight, the assembly plate 209 is inserted into the extension end of the mandrel 7, and the locking heads 4 at its top and bottom ends slide up and down to engage with the locking heads 4 of the previous piece through the tapered dovetail groove and the protrusion, forming a self-locking structure. When disassembling, the assembly plate 209 can be separated by sliding the locking heads 4 in the opposite direction. The bidirectional sliding engagement design of the tapered dovetail groove and the protrusion of the locking heads 4 realizes axial limiting and anti-fall-off between the assembly plates 209, eliminating the risk of shaking when the counterweights are stacked. This structure remains stable under load, avoids accidental separation during training, and simplifies the assembly process. Users only need to slide and engage to complete the expansion of the counterweight.

[0029] An inertial gear 204 is rotatably connected to the inside of the cover 3. Multiple gear slots 5 are arranged in a circular array on the end face of the drive wheel 2 near the throttle 102. A connecting groove 501 is formed on the side of the inertial gear 204 near the drive wheel 2. A positioning bead 502 is slidably disposed inside the connecting groove 501. A first spring 503 is fixed between the positioning bead 502 and one side of the inner wall of the connecting groove 501. The positioning bead 502 abuts against the inside of the corresponding gear slot 5. When the throttle 102 is rotated, the drive wheel… 2. The surface pressure positioning bead 502 compresses the first spring 503; when the positioning bead 502 slides into the adjacent gear slot 5, the first spring 503 releases its elastic force to make it hit the slot and make a sound, indicating that the gear shift is complete. The elastic cooperation mechanism between the positioning bead 502 and the gear slot 5, through the elastic force of the first spring 503, generates tactile feedback sound and mechanical positioning when shifting gears, so that users can perceive the gear shift without visual inspection, solving the problem of blind operation deviation; at the same time, it reduces the processing accuracy requirements and reduces manufacturing costs.

[0030] An external gear ring 6 is fixed to the outer wall of the drive wheel 2. The external gear ring 6 is located inside the scale wheel 201. A locking seat 601 is also movably fitted onto the outer wall of the drive wheel 2. The locking seat 601 is attached to the side of the scale wheel 201 away from the throttle 102. A locking groove 602 is formed inside the locking seat 601. A locking block 603 is slidably arranged inside the locking groove 602. The end face of the locking block 603 is a beveled structure. A second spring 604 is fixed between the locking block 603 and one side of the inner wall of the locking groove 602. One side of the locking block 603 is provided with teeth that mesh with the external gear ring 6. The locking block 603 can slide to the external gear ring 6 and engage to lock the drive wheel 2. Two trigger seats 605 are provided on the top surface of the base 101. The top surface of the trigger seats 605 is a beveled structure and can engage with the locking block 603. In coordination, the outer wall of the cover 3 has a clearance opening corresponding to the position of the locking block 603. When the dumbbell is placed on the base 101, the trigger seat 605 passes through the clearance opening of the cover 3 and presses against the locking block 603, causing it to compress the second spring 604 and slide into the locking groove 602, disengaging from the outer toothed ring 6. At this time, the drive wheel 2 can rotate freely to adjust the gear. After being removed from the base, the second spring 604 pushes the locking block 603 to reset and engage the outer toothed ring 6, locking the drive wheel 2. The constant engagement design of the locking block 603 and the outer toothed ring 6 locks the drive wheel 2 in the non-adjustment state, preventing accidental weight switching caused by accidental touch during training. The trigger seat 605 of the base 101 automatically unlocks by pressing against the locking block 603 through the clearance opening, ensuring that the gear adjustment function is only activated when the dumbbell is placed on the base, improving operational safety and logical rationality.

[0031] The throttle 102 has two through shafts 7 slidably mounted inside. Both through shafts 7 are semi-circular shafts and can slide towards both ends of the throttle 102. Connecting steel plates 207 and mounting plates 209 are movably sleeved on the outer wall of the through shafts 7. The fixed end cap 301 extends into the interior of the drive wheel 2 from one end near the cover 3. A driven wheel 701 is rotatably connected to one end of the fixed end cap 301 extending into the drive wheel 2. Multiple drive balls 702 are fixed in a circular array on the outer wall of the driven wheel 701. Multiple arc-shaped straight grooves 703 and multiple arc-shaped inclined grooves 704 are formed in a circular array on the inner wall of the drive wheel 2. The multiple arc-shaped straight grooves 703 and 704 are formed in a circular array. 3. Multiple arc-shaped inclined grooves 704 are staggered. Multiple driving balls 702 on the driven wheel 701 near the inner wall of the driving wheel 2 are slidably connected to the inner wall of the arc-shaped straight groove 703. Multiple driving circular grooves 705 are formed in a linear array on the outer wall of the through shaft 7. Multiple driving balls 702 on the driven wheel 701 away from the arc-shaped straight groove 703 are movably inserted into the inside of the driving circular grooves 705. A connecting groove 706 is formed on the inner wall of the fixed end cover 301 at the position corresponding to the driving circular groove 705. A stop ball 707 is slidably arranged inside the connecting groove 706. The stop ball 707 is fixed to the inner wall of the connecting groove 706. The third spring 708 and the shift ball 707 abut against the interior of the corresponding drive groove 705. When the drive wheel 2 rotates for the first time, the drive ball 702 slides within the arc-shaped straight groove 703 without any oblique force, and the through-shaft 7 does not extend. Upon subsequent rotation, the drive ball 702 slides into the arc-shaped inclined groove 704, generating an oblique abutting force that pushes the driven wheel 701 to rotate. On the other side, the drive ball 702 pushes the through-shaft 7 outward within the drive groove 705, allowing the assembly piece 209 to be installed. During this process, the third spring 708 applies a spring force to drive the shift ball 707 to abut against the corresponding drive groove 705, and the through-shaft 7 slides outward. The shift ball 707 is forced to disengage from the corresponding drive groove 705 and enter the adjacent drive groove 705. During this process, the elastic force of the third spring 708 causes the shift ball 707 to strike the groove and make a sound, indicating gear shifting. The worm gear transmission design of the arc-shaped inclined groove 704 and the drive ball 702 converts the rotational motion of the drive wheel 2 into the linear displacement of the through shaft 7, realizing the step-by-step expansion of the counterweight plate. The staggered arc straight groove 703 and inclined groove 704 ensure that the first rotation only connects the counterweight half ring 206 of the basic counterweight. After the second rotation, the drive assembly plate 209 is added, breaking through the traditional fixed gear limitation of dumbbells.

[0032] A locking nut 8 is rotatably connected to the side of the drive gear 202 near the throttle 102. The locking nut 8 is threadedly connected to the throttle 102. Limiting notches are provided at both ends of the throttle 102. Limiting protrusions that slide and engage with the limiting notches are provided on the inner wall of the drive wheel 2. This allows the drive wheel 2 to rotate with the throttle 102 and prevents the locking nut 8 from rotating with it. When the throttle 102 is rotated, its limiting notches engage with the limiting protrusions on the inner wall of the drive wheel 2, causing the drive wheel 2 to rotate synchronously. The locking nut 8 is threadedly connected to the throttle 102, pressing the drive gear 202 so that it does not rotate with the drive wheel 2, but only transmits torque to the idler gear 204. The sliding engagement between the limiting protrusions and the notches of the throttle 102 ensures that the drive wheel 2 always rotates synchronously with the throttle, avoiding transmission failure. The threaded fixing mechanism of the locking nut 8 prevents the drive gear 202 from loosening during gear shifting, improves the stability of the gear transmission chain, and reduces the failure rate caused by component displacement from the root.

[0033] The working principle of this embodiment is as follows: First, the counterweight half-ring 206 is inserted into the groove of the base 101, and the handle 102 is held and placed on the base 101. At this time, the counterweight half-ring 206 is inserted between the cover 3 and the connecting steel plate 207, and is combined with the fixed end cover 301 to form a disc structure. The trigger seat 605 on the base 101 passes through the clearance opening of the cover 3 and presses against the locking block 603 to make it slide into the locking groove 602. The locking block 603 disengages from the outer toothed ring 6, and at the same time compresses the second spring 604, so that the driving wheel 2 can rotate relative to the cover 3. Rotating the throttle 102 drives the drive wheel 2 to rotate. When the drive wheel 2 rotates, the positioning bead 502 slides against the surface of the drive wheel 2 under the action of the first spring 503. When the positioning bead 502 slides from the initial gear slot 5 into the other gear slot 5, the elastic force of the first spring 503 causes it to strike into the slot, making a sound to indicate gear shifting. At the same time, the drive wheel 2 drives the idler gear 204 to rotate, and the idler gear 204 drives the internal gear ring 203 and the scale wheel 201 to rotate. The user can observe the scale through the display port of the cover 3 to confirm the gear. During the rotation of the drive wheel 2, multiple hooking protrusions 205 rotate accordingly. One of the hooking protrusions 205 hooks with the mating protrusion 208 of the counterweight half-ring 206, completing the installation of the counterweight half-ring 206 and the drive wheel 2, thus achieving a small weight counterweight. It is worth noting that, since the drive ball 702 of the driven wheel 701 is slidably disposed inside the arc-shaped straight groove 703 on the inner wall of the driving wheel 2, when the driving wheel 2 rotates, the drive ball 702 will slide inside the arc-shaped straight groove 703. The arc-shaped straight groove 703 will not apply an oblique abutting force to the drive ball 702, so the drive ball 702 will not move, the driven wheel 701 will not rotate, and the through shaft 7 will not extend outward.

[0034] When it is still necessary to add counterweight, rotate the drive wheel 2 again, and the engagement protrusion 205 rotates to disengage the mating protrusion 208. The mating protrusion 208 is located in the gap of the engagement protrusion 205, and the counterweight half ring 206 separates from the drive wheel 2. At this time, the drive ball 702 of the driven wheel 701 slides from the arc straight groove 703 into the adjacent arc inclined groove 704. The arc-shaped groove 704 applies an oblique abutment force, pushing the drive ball 702 to rotate the driven wheel 701, similar to a worm gear transmission. At this time, the drive ball 702 on the other side of the driven wheel 701 interacts with the drive groove 705, pushing the through shaft 7 to slide outwards towards the throttle 102. During this process, the third spring 708 applies a spring force to drive the gear shift ball 707 to abut against the corresponding drive groove 705. When the through shaft 7 slides outwards, it forces the gear shift ball 707 to disengage from the corresponding drive groove 705 and enter the adjacent drive groove 705. During this process, the spring force of the third spring 708 causes the gear shift ball 707 to strike into the groove, producing a sound to indicate gear shifting. The complete assembly piece 209 is inserted into the extension end of the through shaft 7 and engaged with the previous piece through the tapered dovetail groove and protrusion of the chuck 4. This process is repeated to achieve secondary or multiple small-weight counterweights.

[0035] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the scope of protection of the present utility model.

Claims

1. A dumbbell and its base, comprising a dumbbell body (1), characterized in that, The dumbbell body (1) has a base (101) on its bottom surface. The dumbbell body (1) includes a throttle (102), and both ends of the throttle (102) are equipped with gear adjustment components. The gear shifting assembly includes a drive wheel (2) connected to both ends of the throttle (102). A scale wheel (201) is rotatably connected to the outer wall of the drive wheel (2). A drive gear (202) is fixed to the end face of the drive wheel (2) near the throttle (102). An internal gear ring (203) is fixed to the inner ring of the scale wheel (201). Two inert gears (204) mesh between the drive gear (202) and the internal gear ring (203). The end face of the drive wheel (2) away from the throttle (102) is provided with a plurality of hooking protrusions (205) in a circular array. The end face of the drive wheel (2) away from the throttle (102) is also provided with a counterweight half ring (206) and a connecting steel plate (207) in sequence. The bottom surface of the counterweight half ring (206) is provided with a mating protrusion (208). The hooking protrusions (205) can be hooked with the mating protrusions (208). The connecting steel plate (207) is connected in a row with multiple assembly pieces (209) on the side away from the counterweight half ring (206).

2. A dumbbell and its base according to claim 1, characterized in that, Both ends of the throttle (102) are movably fitted with protective covers (3). The drive wheel (2) and the scale wheel (201) are both located inside the protective cover (3). The outer wall of the protective cover (3) has a display port corresponding to the scale number of the scale wheel (201). The end of the protective cover (3) away from the throttle (102) is provided with a fixed end cap (301). The counterweight half ring (206) and the fixed end cap (301) are combined to form a disc structure. The connecting steel plate (207), the fixed end cap (301) and the protective cover (3) are detachably installed by bolts.

3. A dumbbell and its base according to claim 2, characterized in that, The top and bottom ends of the connecting steel plate (207) and the assembly plate (209) are slidably engaged with a clamp head (4). One side of the clamp head (4) is provided with a tapered dovetail groove, and the other side is a tapered dovetail protrusion. Two adjacent clamp heads (4) can slide and engage vertically.

4. A dumbbell and its base according to claim 3, characterized in that, The inertial gear (204) is rotatably connected to the inside side of the cover (3). The drive wheel (2) has multiple gear slots (5) arranged in a circular array on the end face near the throttle (102). The inertial gear (204) has a connecting groove (501) on the side near the drive wheel (2). A positioning bead (502) is slidably arranged inside the connecting groove (501). A first spring (503) is fixed between the positioning bead (502) and the inner wall of the connecting groove (501). The positioning bead (502) abuts against the inside of the corresponding gear slot (5).

5. A dumbbell and its base according to claim 4, characterized in that, An external toothed ring (6) is fixed to the outer wall of the drive wheel (2). The external toothed ring (6) is located inside the scale wheel (201). A locking seat (601) is also movably fitted on the outer wall of the drive wheel (2). The locking seat (601) is attached to the side of the scale wheel (201) away from the throttle (102). A locking groove (602) is opened inside the locking seat (601). A locking block (603) is slidably arranged inside the locking groove (602). A second spring (604) is fixed between the locking block (603) and one side of the inner wall of the locking groove (602). A tooth that meshes with the external toothed ring (6) is provided on one side of the locking block (603). The locking block (603) can slide to the external toothed ring (6) and mesh to lock the drive wheel (2). Two trigger seats (605) are provided on the top surface of the base (101). An avoidance opening is opened on the outer wall of the cover (3) corresponding to the position of the locking block (603).

6. A dumbbell and its base according to claim 5, characterized in that, The throttle (102) has two through shafts (7) slidably mounted inside. The through shafts (7) are both semi-circular shafts and can slide towards both ends of the throttle (102). The connecting steel plate (207) and the assembly plate (209) are movably sleeved on the outer wall of the through shaft (7). The fixed end cover (301) extends into the interior of the drive wheel (2) from one end near the cover (3). The end of the fixed end cover (301) extending into the interior of the drive wheel (2) is rotatably connected to the driven wheel (701). The outer wall of the driven wheel (701) is fixed with multiple drive balls (702) in a circular array. The inner wall of the drive wheel (2) is provided with multiple arc straight grooves (703) and multiple arc inclined grooves (704) in a circular array. The multiple arc straight grooves (703) and multiple arc inclined grooves (704) are staggered. In this configuration, multiple drive balls (702) on the side of the driven wheel (701) near the inner wall of the driving wheel (2) are slidably connected to the inner wall of the arc straight groove (703). The outer wall of the through shaft (7) is provided with multiple drive circular grooves (705) in a straight array. Multiple drive balls (702) on the driven wheel (701) away from the arc straight groove (703) are movably inserted into the inside of the drive circular groove (705). The inner wall of the fixed end cover (301) is provided with a connecting groove two (706) at the position corresponding to the drive circular groove (705). A gear ball (707) is slidably arranged inside the connecting groove two (706). A third spring (708) is fixed between the gear ball (707) and the inner wall of the connecting groove two (706). The gear ball (707) abuts against the inside of the corresponding drive circular groove (705).

7. A dumbbell and its base according to claim 6, characterized in that, The drive gear (202) is rotatably connected to a locking nut (8) on the side near the throttle (102). The locking nut (8) is threadedly connected to the throttle (102). Limiting notches are provided at both ends of the throttle (102). The inner wall of the drive wheel (2) is provided with a limiting protrusion that slides and engages with the limiting notch, so that the drive wheel (2) rotates with the throttle (102) and prevents the locking nut (8) from rotating with it.

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