CN106730590A - A kind of dumbbell - Google Patents
A kind of dumbbell Download PDFInfo
- Publication number
- CN106730590A CN106730590A CN201611236562.1A CN201611236562A CN106730590A CN 106730590 A CN106730590 A CN 106730590A CN 201611236562 A CN201611236562 A CN 201611236562A CN 106730590 A CN106730590 A CN 106730590A
- Authority
- CN
- China
- Prior art keywords
- handle
- weight stack
- chip select
- cam
- dumbbell
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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Classifications
-
- A—HUMAN NECESSITIES
- A63—SPORTS; GAMES; AMUSEMENTS
- A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
- A63B21/00—Exercising apparatus for developing or strengthening the muscles or joints of the body by working against a counterforce, with or without measuring devices
- A63B21/06—User-manipulated weights
- A63B21/072—Dumb-bells, bar-bells or the like, e.g. weight discs having an integral peripheral handle
- A63B21/075—Dumb-bells, bar-bells or the like, e.g. weight discs having an integral peripheral handle with variable weights, e.g. weight systems with weight selecting means for bar-bells or dumb-bells
Abstract
The invention discloses a kind of dumbbell, multigroup symmetrically arranged weight stack including handle and with the dismantled and assembled cooperation in the two ends of handle, also include the chip select base for placing weight stack with fixed angle and position, the linkage section that handle two ends are used to connect balancing weight is provided with rotation chip select mechanism, and the medial surface that weight stack is connected with handle is provided with for being connected the fit structure for coordinating with rotation chip select mechanism；By rotating handles, can make rotation chip select structure that connection is connected or deviate from weight stack to increase and decrease dumbbell counterweight.New attachment structure is set between handle and weight stack, by way of swing handle, so that rotation chip select mechanism is connected to weight stack or disengages weight stack, often being held due to handle can be connected with multiple weight stacks, each weight stack can be connected by rotating chip select mechanism with handle, therefore the quantity that the weight stack being connected with handle can be changed by swing handle is realized increasing and decreasing counterweight with this, simplifies change dumbbell weighting operation flow.
Description
Technical field
The present invention relates to body-building apparatus technical field, more specifically to a kind of dumbbell.
Background technology
Dumbbell is the auxiliary appliance of a kind of weight lifting and exercise.Smaller than barbell, the variation of weight size is adapted to different
Crowd and need of exercise, thus by the favor of vast fitness enthusiasts.The common dumbbell of in the market generally comprises the handle of centre
And positioned at the weight stack of the fixation of handle both sides or detachable assembling, it is general to be made of materials such as cast iron parcel rubber.
Inventor has found that there are the dumbbell of existing traditional structure some to use upper deficiency, is mainly reflected in：
Because itself design structure is simple, counterweight is relatively fixed, and is immediately the adjustable dumbbell of counterweight, and regulation counterweight is general
Need by：Pull down locking, increase and decrease weight stack, the step of reinstall fixed locking, and be to ensure counterweight balance, above-mentioned behaviour
Making the counterweight preferably to dumbbell both sides is all carried out one time, it is seen that it adjusts the cumbersome of counterweight.Just because of it is such the reason for, cause
The exercising way reached using dumbbell is single, and train on is general；Counterweight increases trouble, therefore initial resistance is big, resistance regulation
Scope is small, just not ideal enough for certain form of train on.
In sum, existing dumbbell regulation counterweight process how is efficiently solved cumbersome, the technology of influence train on etc.
Problem, is current those skilled in the art's urgent problem.
The content of the invention
In view of this, it is an object of the invention to provide a kind of dumbbell, the structure design of the dumbbell can be efficiently solved
Existing dumbbell regulation counterweight process is cumbersome, the technical problem of influence train on etc..
In order to achieve the above object, the present invention provides following technical scheme：
A kind of dumbbell, including handle and the multigroup symmetrically arranged weight stack with the dismantled and assembled cooperation in the two ends of the handle,
Also include the chip select base for placing weight stack with fixed angle and position, the handle two ends are used to connect balancing weight
Linkage section is provided with rotation chip select mechanism, the weight stack and the medial surface that the handle is connected be provided with for it is described
The fit structure that the connection of rotation chip select mechanism coordinates；By rotating the handle, can make it is described rotation chip select structure with it is described
Weight stack is connected or abjection connection is to increase and decrease dumbbell counterweight.
Preferably, in above-mentioned dumbbell, the rotation chip select mechanism includes cam and the elasticity coordinated with cam edge molded line
Latch, the cam is circumferentially fixed with the handle, the axial direction of cam and corresponding resilient pin opposite handle described in every group
Position consistency of the position with weight stack on base；Fit structure on the weight stack is the position with the resilient pin
And the jack of dimensional fits.
Preferably, in above-mentioned dumbbell, the rotation chip select mechanism also includes latch limit base, and the latch limit base is placed on
The periphery of the cam, the mounting groove for installing the resilient pin is provided with the position of resilient pin, and the elasticity is inserted
Pin is held out against in the edge of the corresponding cam by elastic spacing one end.
Preferably, in above-mentioned dumbbell, each adjacent cam of the same rotation chip select mechanism ejects respective resilient pin
It is different to the phase angle of peak and to be spaced equal angular poor.
Preferably, in above-mentioned dumbbell, positioning two is provided between each adjacent cam of the same rotation chip select mechanism
The Peripheric locking structure of person's relative angle.
Preferably, in above-mentioned dumbbell, the inner of the linkage section of the handle is provided with the shaft shoulder structure for holding out against the cam；
The two ends of the handle are mounted with the back-up ring for holding out against outermost cam by pin.
Preferably, in above-mentioned dumbbell, self-locking mechanism is additionally provided between the handle and weight stack, for by lifting handle
The action of hand is by by rotating weight stack and the handlebar locked that chip select mechanism is connected with handle.
Preferably, in above-mentioned dumbbell, the resilient pin is provided with sphere header structure with the end of cam engagement.
The dumbbell that the present invention is provided, including handle and multigroup symmetrically arranged with the dismantled and assembled cooperation in the two ends of the handle
Weight stack, also including the chip select base for placing weight stack with fixed angle and position, the handle two ends are used to connect
The linkage section of balancing weight is provided with rotation chip select mechanism, and the medial surface that the weight stack is connected with the handle is provided with use
In the fit structure that cooperation is connected with the rotation chip select mechanism；By rotating the handle, the rotation chip select knot can be made
Structure is connected or deviates from connection to increase and decrease dumbbell counterweight with the weight stack.The present invention provide this in dumbbell, in its handle and match somebody with somebody
New attachment structure is set between weight piece, by way of swing handle so that rotation chip select mechanism be connected to weight stack or
Weight stack is disengaged, often being held due to handle can be connected with multiple weight stacks, and each weight stack can be by rotating sheet selection machine
Structure is connected with handle, therefore realizes that increase and decrease is matched somebody with somebody with this by the quantity that swing handle can change the weight stack being connected with handle
Weight；The design increase and decrease counterweight of this dumbbell is convenient only need to can be picked up counterweight or unloaded by rotating handles from base, greatly
It is big to simplify the operating process for changing dumbbell counterweight, it is no longer necessary to carry out the dismounting of locking having in traditional dumbbells, effectively
Solve that existing dumbbell regulation counterweight process is cumbersome, the technical problem of influence train on etc..
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
The accompanying drawing to be used needed for having technology description is briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, can be with
Other accompanying drawings are obtained according to these accompanying drawings.
Fig. 1 is the integral outer structural representation of dumbbell provided in an embodiment of the present invention；
Fig. 2 is the cross-sectional view of dumbbell provided in an embodiment of the present invention；
Fig. 3 is the part section structural representation of a-quadrant in Fig. 2；
Fig. 4 is the structural representation of the cam position of dumbbell provided in an embodiment of the present invention.
Marked in accompanying drawing as follows：
Back-up ring 1, weight stack 2, latch limit base 3, spring 4, resilient pin 5, cam 6, handle 7, chip select base 8, rotation
Chip select mechanism 9, jack 10, sphere header structure 11.
Specific embodiment
The embodiment of the invention discloses a kind of dumbbell, cumbersome to solve existing dumbbell regulation counterweight process, effect is tempered in influence
The technical problem of fruit etc..
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation is described, it is clear that described embodiment is only a part of embodiment of the invention, rather than whole embodiments.It is based on
Embodiment in the present invention, it is every other that those of ordinary skill in the art are obtained under the premise of creative work is not made
Embodiment, belongs to the scope of protection of the invention.
Fig. 1 to Fig. 4 is referred to, Fig. 1 is the integral outer structural representation of dumbbell provided in an embodiment of the present invention；Fig. 2 is
The cross-sectional view of dumbbell provided in an embodiment of the present invention；Fig. 3 is the part section structural representation of a-quadrant in Fig. 2；Figure
4 is the structural representation of the cam position of dumbbell provided in an embodiment of the present invention.
The dumbbell that embodiments of the invention are provided, including handle 7 and multigroup with the dismantled and assembled cooperation in the two ends of the handle 7
Symmetrically arranged weight stack 2, also including the chip select base 8 for placing weight stack 2 with fixed angle and position, the handle
The linkage section that 7 two ends are used to connect balancing weight is provided with rotation chip select mechanism 9, and the weight stack 2 is connected with the handle 7
Medial surface is provided with for being connected the fit structure for coordinating with the rotation chip select mechanism 9；By rotating the handle 7, energy
Enough make the rotation chip select structure that connection is connected or deviate from the weight stack 2 to increase and decrease dumbbell counterweight.
Wherein it should be noted that being provided with inserting slot construction on chip select base, holding needs between adjacent weight stack are made
Spacing distance, and weight stack can be made to be docked with handle with fixed angle, it is ensured that the smooth work of rotation chip select mechanism
Make；
For the normal using needing of dumbbell, it is desirable to which the counterweight at handle two ends is consistent, thus handle two ends rotation chip select
The working method requirement of the pickup weight stack of mechanism is consistent, i.e., handle is rotated during to certain angle, when the rotation sheet selection machine of one end
Structure picks up certain specified weight stack, and the rotation chip select mechanism of the other end also picks up that certain weight is identical, positional symmetry weight stack, is unloading
During lower weight stack similarly.
Dumbbell in this of the present embodiment offer, sets new attachment structure between its handle and weight stack, by turning
The mode of dynamic handle so that rotation chip select mechanism is connected to weight stack or disengages weight stack, often held due to handle can with it is many
Individual weight stack connection, each weight stack can be connected by rotating chip select mechanism with handle, therefore can be with by swing handle
The quantity of the weight stack that change is connected with handle is realized increasing and decreasing counterweight with this；The design increase and decrease counterweight of this dumbbell is convenient need to only to lead to
Counterweight is picked up or unloaded from base by crossing rotating handles, the operating process for changing dumbbell counterweight is enormously simplify, no longer
Need to carry out the dismounting of locking having in traditional dumbbells, it is cumbersome to efficiently solve existing dumbbell regulation counterweight process, shadow
Ring the technical problem of train on etc..
It is preferred on the basis of above-described embodiment further to optimize above-mentioned technical proposal, in above-mentioned dumbbell, the rotation
Turn the resilient pin 5 that chip select mechanism 9 coordinates including cam 6 and with the edge molded line of cam 6, the cam 6 with the handle 7 weeks
To fixation, the axial location of cam 6 described in every group and the opposite handle 7 of corresponding resilient pin 5 is with weight stack 2 on base
Position consistency；Fit structure on the weight stack 2 is the jack 10 of position with the resilient pin 5 and dimensional fits.
In the technical scheme that the present embodiment is provided, using setting cam engagement resilient pin on handle and on weight stack
The design for setting jack realizes rotating handles connection or releases the action for connecting weight stack, the edge of each cam with handle in
Axle is vertical, and the two is circumferentially fixed, effectively can be rotated with moving cam by rotating handles, and edge and the resilient pin of cam are matched somebody with somebody
Close, resilient pin, resilient pin elongation, the jack on other end insertion weight stack, so that effectively real are ejected in rotation process
Existing handle is connected with the structure of weight stack；There is resilient pin elasticity to set in itself, the end that it can be made to coordinate with cam contact
Head keeps holding out against in the side of cam, and when cam rotation to low spot, resilient pin can retract from jack, make handle release
With the connection of weight stack.The design structure of the rotation chip select mechanism is simple, and work controllability and continuity are all relatively good, it is not easy to
There is job failure, can smoothly realize the switching of counterweight.
It is preferred on the basis of above-described embodiment further to optimize above-mentioned technical proposal, in above-mentioned dumbbell, the rotation
Turning chip select mechanism 9 also includes latch limit base 3, and the latch limit base 3 is placed on the periphery of the cam 6, in resilient pin 5
Position is provided with the mounting groove for installing the resilient pin 5, and the resilient pin 5 is held out against in right by elastic spacing one end
The edge of the cam 6 answered.
In the technical scheme that the present embodiment is provided, further it is provided for that inserting for resilient pin 5 is installed outside resilient pin 5
Pin limit base, is held out against one end of resilient pin 5 with cam 6 by the spring 4 on latch limit base assistant spring latch 5, is inserted
Pin limit base is actually the shell structure of set and each periphery of cam 6, and it does not rotate in company with the rotation of handle 7, and elasticity is inserted
In the mounting groove that pin 5 is arranged on, and the connection realized in insertion jack with weight stack can be stretched out from mounting groove.It is this
The position of effective Fixed latches is designed to, makes resilient pin 5 more stablize with the cooperation position of cam 6.
It is preferred on the basis of above-described embodiment further to optimize above-mentioned technical proposal, in above-mentioned dumbbell, same institute
State rotation chip select mechanism 9 each adjacent cam 6 eject respective resilient pin 5 to the phase angle of peak it is different and
It is poor every equal angular.
In the technical scheme that the present embodiment is provided, make cam eject resilient pin to the phase angle on summit and be uniformly arranged, i.e.,
Handle 7 often rotates identical angle, and one group can be picked up from chip select base 8 or next set of weights piece is unloaded；Wherein preferably set
Meter is, the two ends of handle 7 respectively set 5 groups of cams, corresponding can connect five weight stacks.It is this to be uniformly arranged setting for phase angle
Meter further optimizes the design that dumbbell increases and decreases counterweight, makes the definition and continuity of counterweight regulation all more preferable, further optimization
Consumer's Experience.
It is preferred on the basis of above-described embodiment further to optimize above-mentioned technical proposal, in above-mentioned dumbbell, same institute
The Peripheric locking structure of the two relative angle of positioning is provided between each adjacent cam 6 for stating rotation chip select mechanism 9.
In the technical scheme that the present embodiment is provided, locking mechanism is set between adjacent cam, makes cam be difficult in phase
Deflected under the drive of adjacent cam, it is ensured that the accuracy of its fit angle, also ensure that and often rotate in above-described embodiment
Same angular can pick up or unload the controllability of next weight stack.In addition it should be noted that can be using the cam knot of integral type
Structure, i.e. handle are integrally formed with each cam of one end in processing and manufacturing, just can effectively ensure each in big structure
Angle between individual cam is fixed.
It is preferred on the basis of above-described embodiment further to optimize above-mentioned technical proposal, in above-mentioned dumbbell, described
The inner of the linkage section of hand 7 is provided with the shaft shoulder structure for holding out against the cam 6；Installed by pin at the two ends of the handle 7
It is fixed with the back-up ring 1 for holding out against outermost cam 6.
In the technical scheme that the present embodiment is provided, shaft shoulder structure is set on handle to be used to stop axle of the cam on handle
To position, the connection end that shaft shoulder structure is located at handle two ends is inner namely near the position of handle length midpoint one end, whole
The end of individual handle two ends in other words, assemble pin, and the position of back-up ring is pinned by bayonet fittings, make back-up ring to stop convex
Wheel, coordinates shaft shoulder structure often to hold the cam for connecting to be limited to the position specified on handle by back-up ring, effectively prevents it
In axial dipole field.
It is preferred on the basis of above-described embodiment further to optimize above-mentioned technical proposal, in above-mentioned dumbbell, described
Be additionally provided between hand 7 and weight stack 2 self-locking mechanism, for the action by lift-pull handle 7 will by rotate chip select mechanism 9 with
The weight stack 2 and handlebar locked of the connection of handle 7.
In the technical scheme that the present embodiment is provided, self-locking mechanism is further set between handle and weight stack, by certainly
Latch mechanism auxiliary rotation chip select mechanism, makes the connection between handle and weight stack more consolidate；Due to rotation chip select, mechanism only rises
To the purpose for picking up or unloading weight stack, weight stack can not effectively be fixed.The design that the present embodiment is provided can be with
Self-locking is realized, is to be capable of achieving locking, the occupation mode for meeting general dumbbell simple to operate only by the action of lift-pull handle.
It is preferred on the basis of above-described embodiment further to optimize above-mentioned technical proposal, in above-mentioned dumbbell, the bullet
Property the end that coordinates of latch 5 and cam 6 be provided with sphere header structure 11.
In the technical scheme that the present embodiment is provided, the end of resilient pin sets sphere header structure, to increase resilient pin
The degree of lubrication coordinated with cam electric wire, reduces abrasion of the Reusability to cam and latch end, and reducing mechanism occurs
Stuck risk.
Each embodiment is described by the way of progressive in this specification, and what each embodiment was stressed is and other
The difference of embodiment, between each embodiment identical similar portion mutually referring to.
The foregoing description of the disclosed embodiments, enables professional and technical personnel in the field to realize or uses the present invention.
Various modifications to these embodiments will be apparent for those skilled in the art, as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, the present invention
The embodiments shown herein is not intended to be limited to, and is to fit to and principles disclosed herein and features of novelty phase one
The scope most wide for causing.
Claims (8)
1. a kind of dumbbell, including handle and the multigroup symmetrically arranged weight stack with the dismantled and assembled cooperation in the two ends of the handle, its
It is characterised by, also including the chip select base for placing weight stack with fixed angle and position, the handle two ends are used to connect
The linkage section for connecing balancing weight is provided with rotation chip select mechanism, and the medial surface that the weight stack is connected with the handle is provided with
For being connected the fit structure for coordinating with the rotation chip select mechanism；By rotating the handle, the rotation chip select can be made
Structure is connected or deviates from connection to increase and decrease dumbbell counterweight with the weight stack.
2. dumbbell according to claim 1, it is characterised in that the rotation chip select mechanism includes cam and and cam edge
The resilient pin that molded line coordinates, the cam is circumferentially fixed with the handle, cam and corresponding resilient pin described in every group
Position consistency of the axial location of opposite handle with weight stack on base；Fit structure on the weight stack be with it is described
The position of resilient pin and the jack of dimensional fits.
3. dumbbell according to claim 2, it is characterised in that the rotation chip select mechanism also includes latch limit base, institute
The periphery that latch limit base is placed on the cam is stated, the position of resilient pin is provided with the peace for installing the resilient pin
Tankage, the resilient pin is held out against in the edge of the corresponding cam by elastic spacing one end.
4. dumbbell according to claim 3, it is characterised in that each adjacent cam top of the same rotation chip select mechanism
Go out that respective resilient pin is different to the phase angle of peak and to be spaced equal angular poor.
5. dumbbell according to claim 4, it is characterised in that each adjacent cam of the same rotation chip select mechanism it
Between be provided with the Peripheric locking structure of the two relative angle of positioning.
6. dumbbell according to claim 5, it is characterised in that the inner of the linkage section of the handle be provided with hold out against it is described
The shaft shoulder structure of cam；The two ends of the handle are mounted with the back-up ring for holding out against outermost cam by pin.
7. the dumbbell according to any one of claim 2 to 6, it is characterised in that also set up between the handle and weight stack
Have self-locking mechanism, for the action by lift-pull handle by by rotating weight stack and grip handle lock that chip select mechanism is connected with handle
It is fixed.
8. dumbbell according to claim 7, it is characterised in that the resilient pin is provided with the end of cam engagement
Sphere header structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611236562.1A CN106730590A (en) | 2016-12-28 | 2016-12-28 | A kind of dumbbell |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611236562.1A CN106730590A (en) | 2016-12-28 | 2016-12-28 | A kind of dumbbell |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106730590A true CN106730590A (en) | 2017-05-31 |
Family
ID=58925294
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611236562.1A Pending CN106730590A (en) | 2016-12-28 | 2016-12-28 | A kind of dumbbell |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106730590A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2562045A (en) * | 2017-05-02 | 2018-11-07 | Chen Paul | Adjustable dumbbell |
| WO2023159816A1 (en) * | 2022-02-27 | 2023-08-31 | 童晓蓉 | Counterweight-adjustable dumbbell |
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| US20060240958A1 (en) * | 2005-03-01 | 2006-10-26 | Liu Wei M | Adjustable dumbbell |
| US20070161474A1 (en) * | 2006-01-09 | 2007-07-12 | Stamina Products, Inc. | Adjustable weight |
| CN101199888A (en) * | 2006-11-10 | 2008-06-18 | 众成工业股份有限公司 | Weight training device capable of adjusting weight |
| CN201453936U (en) * | 2009-08-04 | 2010-05-12 | 成都峻峰科技开发有限公司 | Safe fast-assembled dumbbell |
| CN201596294U (en) * | 2009-12-22 | 2010-10-06 | 曾俊明 | Adjustable dumbbell |
| CN201799053U (en) * | 2010-09-17 | 2011-04-20 | 双馀实业有限公司 | Dumbbell capable of being adjusted in graduation |
| CN204380076U (en) * | 2014-12-17 | 2015-06-10 | 韩安卓 | A kind of dumbbell with adjustable weight |
| CN105457213A (en) * | 2014-09-30 | 2016-04-06 | 艾肯运动与健康公司 | Weight selector for multiple dumbbells |
| CN206342849U (en) * | 2016-12-28 | 2017-07-21 | 青岛英派斯健康科技股份有限公司 | A kind of dumbbell |
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- 2016-12-28 CN CN201611236562.1A patent/CN106730590A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060240958A1 (en) * | 2005-03-01 | 2006-10-26 | Liu Wei M | Adjustable dumbbell |
| US20070161474A1 (en) * | 2006-01-09 | 2007-07-12 | Stamina Products, Inc. | Adjustable weight |
| CN101199888A (en) * | 2006-11-10 | 2008-06-18 | 众成工业股份有限公司 | Weight training device capable of adjusting weight |
| CN201453936U (en) * | 2009-08-04 | 2010-05-12 | 成都峻峰科技开发有限公司 | Safe fast-assembled dumbbell |
| CN201596294U (en) * | 2009-12-22 | 2010-10-06 | 曾俊明 | Adjustable dumbbell |
| CN201799053U (en) * | 2010-09-17 | 2011-04-20 | 双馀实业有限公司 | Dumbbell capable of being adjusted in graduation |
| CN105457213A (en) * | 2014-09-30 | 2016-04-06 | 艾肯运动与健康公司 | Weight selector for multiple dumbbells |
| CN204380076U (en) * | 2014-12-17 | 2015-06-10 | 韩安卓 | A kind of dumbbell with adjustable weight |
| CN206342849U (en) * | 2016-12-28 | 2017-07-21 | 青岛英派斯健康科技股份有限公司 | A kind of dumbbell |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2562045A (en) * | 2017-05-02 | 2018-11-07 | Chen Paul | Adjustable dumbbell |
| WO2023159816A1 (en) * | 2022-02-27 | 2023-08-31 | 童晓蓉 | Counterweight-adjustable dumbbell |
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