Adjustable dumbbell structure and its bar plate

Abstract

An adjustable dumbbell structure includes an adjustable weight unit having a plurality of bar pieces, a holding assembly having at least one coupling member, and a control member. Each of the bar pieces has a first coupling portion and a second coupling portion on opposite sides thereof. The bar pieces are coupled to each other by the first coupling portions and the second coupling portions. The coupling member has a third coupling portion capable of being coupled to the first coupling portion or the second coupling portion of the bar pieces. The first coupling portion and the second coupling portion are a male coupling portion and a female coupling portion, respectively. The third coupling portion is a male coupling portion or a female coupling portion. The male coupling portion has an inner space, a clamping piece arranged in the inner space, and an operation opening and a locking opening in communication with the inner space. The female coupling portion has a clamping groove capable of being clamped with the clamping piece. The control member extending into the inner space from the operation opening is capable of switching the clamping piece between a locked position and an unlocked position, so that a user can quickly and conveniently adjust the number of the bar pieces.

Description

Technical Field

[0001] This utility model relates to dumbbells used in fitness activities such as weight training, and more particularly to an adjustable dumbbell structure and its plates, which allows users to quickly and conveniently adjust the number of plates to meet the user's fitness needs. Background Technology

[0002] Dumbbells are a commonly used exercise tool. Traditional dumbbells are one-piece designs and cannot be adjusted in weight. Therefore, dumbbell sets containing multiple dumbbells of different weights are needed to perform training at different weights, such as the "Intelligent Weight Training System" with publication number M581492. Some dumbbells allow users to add or remove weight plates at the ends of the handles, thus adjusting the overall weight, such as the "Dumbbell Set for Easy Storage" with publication number I576135.

[0003] For dumbbells that allow users to adjust weight by adding or removing weight plates, the ease of doing so is paramount. However, most existing dumbbells of this type still present significant challenges in this regard. Some require removing the entire set of plates to select the desired number, while others have overly complex mechanisms that can lead to user errors during adjustment, only to discover the mistake when holding the dumbbell and adjusting it too heavily or too lightly. Furthermore, some dumbbells use interlocking plates, requiring users to use a switching mechanism on the plates to unlock or lock them during weight adjustment. This necessitates manually switching each plate's mechanism, and any confusion during adjustment necessitates checking each mechanism individually. This is extremely inconvenient, and the complexity of the switching mechanisms and the numerous parts increase maintenance and repair costs. Utility Model Content

[0004] In view of the above-mentioned deficiencies, the main purpose of this utility model is to provide an adjustable dumbbell structure and its plates, which allows users to quickly and conveniently adjust the number of plates on the dumbbell so that the weight of the dumbbell meets the user's needs. Even if the weight is not suitable, it can be quickly readjusted, thereby saving adjustment time and avoiding the high maintenance and repair costs caused by the dumbbell's overly complex structure.

[0005] To achieve the above objectives, the adjustable dumbbell structure provided by this utility model includes at least one adjustable weight unit, a grip assembly, and at least one control component. The adjustable weight unit includes multiple bar plates that are detachably stacked together. Each bar plate includes a first connecting portion and a second connecting portion located on its two sides. The first connecting portion of each pair of adjacent bar plates is detachably connected to the other second connecting portion. The grip assembly includes a handle and at least one connecting member fixed to the handle. The connecting member includes a third connecting portion that is detachably connected to one of the first and second connecting portions of one of the bar plates of the adjustable weight unit. The adjustable dumbbell structure includes multiple concave joints and multiple convex joints. Each concave joint includes at least one latching groove, and each convex joint includes an internal space, at least one latching tab disposed in the internal space, and at least one operating opening and at least one locking opening communicating with the internal space. The latching tab includes a locking part, and the latching tab can be switched between a locked position and an unlocked position by a control member extending into the internal space from the operating opening; the first of each bar tab... The connecting part is the convex connecting part, the second connecting part of each lever is the concave connecting part, and the third connecting part of the grip assembly is one of the convex connecting part and the concave connecting part; when a convex connecting part and a concave connecting part are connected to each other, the buckle of the convex connecting part is located in the locking position, the locking part of the buckle protrudes from the locking opening and engages with the locking groove of the concave connecting part, when the buckle is switched to the non-locking position, the locking part moves toward the internal space and releases the engagement with the locking groove.

[0006] To achieve the above objectives, the adjustable dumbbell structure provided by this utility model has a bar plate that can be unlocked by a control mechanism. The bar plate includes a concave engagement portion and a convex engagement portion located on its two sides. The concave engagement portion includes a latching groove, and the convex engagement portion includes an internal space, a latch plate disposed within the internal space, an operating opening and a locking opening communicating with the internal space. The latch plate includes a locking portion, and the latch plate can be switched between a locked position and a unlocked position by the control mechanism extending into the internal space from the operating opening. When the latch plate of the convex engagement portion is in the locked position, the locking portion of the latch plate protrudes from the locking opening and engages with the latching groove of the concave engagement portion of the other bar plate. When the latch plate of the convex engagement portion switches from the locked position to the unlocked position, the locking portion of the latch plate moves towards the internal space, thereby releasing the engagement with the latching groove.

[0007] Therefore, before using the adjustable dumbbell structure, the user can operate the control mechanism on the convex engagement opening of one of the dumbbell plates according to the desired number of plates. By simply and quickly operating the control mechanism, the latch on the convex engagement of the controlled dumbbell plate is switched to the unlocked position, releasing the engagement between the convex engagement of the controlled dumbbell plate and the concave engagement of the adjacent dumbbell plate. At this point, the two dumbbell plates can be separated, allowing the grip assembly to hold only the desired number of plates. To reassemble the dumbbell plates, the same simple and quick operation is performed again, switching the latch on the convex engagement of the controlled dumbbell plate to the unlocked position, aligning the convex engagement with the concave engagement of the other dumbbell plate. Then, switching the latch on the convex engagement to the locked position securely engages the dumbbell plates. Therefore, this invention allows users to quickly and conveniently adjust the number of weight plates on dumbbells, ensuring the dumbbell weight meets their needs. Even if the weight is unsuitable, it can be quickly readjusted, saving adjustment time. Furthermore, the structure of this invention is not overly complex, avoiding high maintenance and repair costs. Another advantage of this invention is that it is not limited by the existing number of weight plates; users can add or remove plates according to their needs, making it suitable for users of varying strengths.

[0008] The detailed construction, features, assembly, and usage of the adjustable dumbbell structure and its plates provided by this utility model will be described in the following specific embodiments. However, those skilled in the art should understand that these detailed descriptions and the specific embodiments listed for implementing this utility model are for illustrative purposes only and are not intended to limit the claims of this utility model. Attached Figure Description

[0009] Figure 1 This is a three-dimensional assembly diagram of the adjustable dumbbell structure provided in a first preferred embodiment of the present invention;

[0010] Figure 2 This is an exploded 3D view of the adjustable dumbbell structure.

[0011] Figure 3 This is an exploded 3D view showing a base and a control mechanism of the adjustable dumbbell structure;

[0012] Figure 4 and Figure 5 An exploded perspective view of a positioning component and a control component of the bracket;

[0013] Figure 6 For the bracket and the control element along Figure 2 A partial sectional view of section line 6-6 in the diagram;

[0014] Figure 7 This is a three-dimensional assembly diagram of one grip component of the adjustable dumbbell structure;

[0015] Figure 8 This is a three-dimensional diagram of the adjustable dumbbell structure with one plate.

[0016] Figure 9 This is a three-dimensional exploded view of the bar.

[0017] Figure 10 This is another three-dimensional combination diagram of the lever plate;

[0018] Figure 11 The grip assembly and bar plates of this adjustable dumbbell structure Figure 2 A partial sectional view along section line 11-11 in the figure;

[0019] Figure 12 For the adjustable dumbbell structure along Figure 1 A partial sectional view of section line 12-12 in the diagram;

[0020] Figure 13 This is a partial top view of the adjustable dumbbell structure;

[0021] Figure 14 This is a partial perspective view of the adjustable dumbbell structure, showing that the control element will be inserted into one of the plates.

[0022] Figure 15 for Figure 14 Sectional view along section line 15-15;

[0023] Figure 16 and Figure 15 Similar, the difference lies in the state where the control element has been inserted into the lever and a guide bevel of a drive part of the control element is pushed against a protrusion;

[0024] Figure 17 and Figure 16 Similar, the difference lies in the fact that the control element is further inserted into the lever and the protrusion is spring-loaded and engaged in an arc groove of the control element by an elastic element;

[0025] Figure 18 This is a three-dimensional assembly diagram of the adjustable dumbbell structure provided in a second preferred embodiment of the present invention;

[0026] Figure 19 This is an exploded 3D view of the adjustable dumbbell structure.

[0027] Figure 20 This is a three-dimensional diagram of the adjustable dumbbell structure with one plate.

[0028] Figure 21 This is a three-dimensional exploded view of the bar.

[0029] Figure 22 This is a top view of the lever; a second plate and a third plate are not shown.

[0030] Figure 23 and Figure 24 This is a cross-sectional view of the adjustable dumbbell structure, showing the process of inserting a control element of the adjustable dumbbell structure into the bar plate;

[0031] Figure 25 and Figure 26 A three-dimensional assembly view of a bar plate and a control component of an adjustable dumbbell structure provided in a third preferred embodiment of this utility model;

[0032] Figure 27 An exploded 3D view of the lever and the control component;

[0033] Figure 28 for Figure 26 The front view shows the control element in a retracted position;

[0034] Figure 29 and Figure 28 Similar, the difference being that the control element is located in an extended position;

[0035] Figures 30 to 32 A three-dimensional assembly diagram of a bar plate and a control component of an adjustable dumbbell structure provided in a fourth preferred embodiment of this utility model;

[0036] Figure 33 An exploded 3D view of the lever and the control component;

[0037] Figure 34 for Figure 32 The front view does not show a third plate and shows that the control element is in a first angular position;

[0038] Figure 35 and Figure 34 Similar, the difference is that the control element is located at a second angle position;

[0039] Figure 36 and Figure 37 A three-dimensional view of a bar plate assembly for an adjustable dumbbell structure provided in a fifth preferred embodiment of this utility model;

[0040] Figure 38 An exploded 3D view of the lever and a control component;

[0041] Figure 39 for Figure 37 The front view also shows the control element but not a third plate, and shows the latch in a non-locking position;

[0042] Figure 40and Figure 39 Similar, the difference is that the fastener is located in a locking position.

[0043] In the accompanying drawings, the meanings of the reference numerals are as follows:

[0044] 100, 200 - Adjustable dumbbell design;

[0045] 10-Frame;

[0046] 11-Frame component;

[0047] 111-Frame plate;

[0048] 111a - Extension;

[0049] 111b - Connecting segment;

[0050] 112 - Inner wall;

[0051] 12-Positioning component;

[0052] 121 - Outer shell piece;

[0053] 121a - Inner surface;

[0054] 121b - Outer surface;

[0055] 121c - Connecting slot;

[0056] 121d - Snap-on slot;

[0057] 121e-side groove wall;

[0058] 121f-Snap-on Rib;

[0059] 122-Baffle;

[0060] 123 - Fourth joint;

[0061] 124 - Temporary storage space;

[0062] 125 - Access opening;

[0063] 20-Adjustable weight unit;

[0064] 21, 21A, 21B, 21C, 21D - Bar plates;

[0065] 211-First joint;

[0066] 212 - Second joint;

[0067] 30 - Grip components;

[0068] 31-Handle;

[0069] 32-Matching component;

[0070] 321 - Third joint;

[0071] 322-Substrate;

[0072] 40 - Control components;

[0073] 41-Control Department;

[0074] 411-Arc-shaped groove;

[0075] 42-Body;

[0076] 43-Positioning section;

[0077] 431-Arc groove;

[0078] 44-Drive unit;

[0079] 441-terminal;

[0080] 442 - Guide hypotenuse;

[0081] 45 - Extension;

[0082] 46- Inclined guide groove;

[0083] 461 - Upper end;

[0084] 462 - Lower end;

[0085] 47, 48 - Positioning holes;

[0086] 49-Pivot hole;

[0087] 50-convex joint;

[0088] 51-First plate;

[0089] 511-Outer edge;

[0090] 512 - Locking opening;

[0091] 513 - Button receiving slot;

[0092] 514 - Limiting part;

[0093] 515 - Positioning Post;

[0094] 516 - Pivot;

[0095] 52 - Second plate;

[0096] 521 - Outer edge;

[0097] 522 - Operating opening;

[0098] 523 - Control component receiving slot;

[0099] 524-Long strip board;

[0100] 53-Third plate;

[0101] 531-Groove;

[0102] 54-Internal space;

[0103] 55-Substrate;

[0104] 60-Concave joint;

[0105] 61-Motherboard;

[0106] 62-Front side panel;

[0107] 621-Snap-on slot;

[0108] 63 - Rear side panel;

[0109] 64 - Assembly slot;

[0110] 70-Spring buckle assembly;

[0111] 71-Elastic component;

[0112] 711 - First end;

[0113] 712 - Second end;

[0114] 72-Button;

[0115] 721 - Locking part;

[0116] 722 - Limiting part;

[0117] 723 - Rack section;

[0118] 73-convex prism;

[0119] 80-Base;

[0120] 81-Chassis;

[0121] 811-upper plate;

[0122] 812-Lower plate;

[0123] 813 - Temporary storage slot;

[0124] 814 - Access Opening;

[0125] 82-Fourth joint;

[0126] 90-Control components;

[0127] 91-Gear section;

[0128] P1 - Lock position;

[0129] P2 - Non-locking position;

[0130] P3 - Indentation position;

[0131] P4 - Extended position;

[0132] P5 - First angle position;

[0133] P6 - Second angle position. Detailed Implementation

[0134] The applicant hereby clarifies that in the embodiments and accompanying drawings described below, the same reference numerals denote the same or similar components or structural features thereof. It should be noted that the components and structures in the drawings are for illustrative purposes and are not drawn according to actual scale and quantity; and features of different embodiments may be used interchangeably where feasible in actual implementation. Furthermore, when it is stated that a component is disposed on another component, it means that the aforementioned component is directly disposed on the other component, or the aforementioned component is indirectly disposed on the other component; that is, one or more other components are disposed between the two components. Conversely, when it is stated that a component is "directly" disposed on another component, it means that no other components are disposed between the two components.

[0135] Please refer to the following first. Figure 1 and Figure 2 The adjustable dumbbell structure 100 provided in a first preferred embodiment of this utility model includes a frame 10, two adjustable weight units 20, a grip assembly 30, and two control members 40. The accompanying drawings of this embodiment only show one control member 40 located on one side of the frame 10; the other control member 40 is located on the other side of the frame 10. Figure 2 It can be seen that the two adjustable weight units 20 and the grip component 30 together constitute a dumbbell.

[0136] like Figures 2 to 6 As shown, the frame 10 includes a frame 11 and two positioning members 12 disposed on both sides of the inner wall of the frame 11. Figure 7 As shown, the grip assembly 30 includes a handle 31 and two connecting members 32 respectively assembled and fixed to both ends of the handle 31. Figure 2 and Figures 8 to 10As shown, each adjustable weight unit 20 includes a plurality of levers 21 that can be detachably stacked together. In this embodiment, each adjustable weight unit 20 has three levers, but this is not a limitation. Each lever 21 includes a first connecting portion 211 and a second connecting portion 212 located on its two sides respectively. The first connecting portion 211 of each pair of adjacent levers 21 is detachably connected to the other second connecting portion 212, so that the plurality of levers 21 are stacked together to form the adjustable weight unit 20. In addition, each of the connecting members 32 of the grip assembly 30 includes a third connecting portion 321, and the two adjustable weight units 20 are detachably connected to the third connecting portions 321 of the two connecting members 32 respectively. In addition, each of the positioning members 12 of the frame 10 includes a fourth connecting portion 123. Figure 1 In the state shown, the two adjustable weight units 20 are detachably connected to the fourth connection portion 123 of the two positioning members 12.

[0137] Furthermore, the first connecting portion 211 of each lever 21 is a convex connecting portion 50, and the second connecting portion 212 of each lever 21 is a concave connecting portion 60. Since each of the third connecting portions 321 of the grip assembly 30 in this embodiment is connected to the first connecting portion 211 of a lever 21, each of the third connecting portions 321 is similar to the second connecting portion 212 of the lever 21, that is, a concave connecting portion 60. Additionally, in this embodiment, each of the fourth connecting portions 123 of the frame 10 is connected to the second connecting portion 212 of a lever 21, therefore each of the fourth connecting portions 123 is similar to the first connecting portion 211 of the lever 21, that is, a convex connecting portion 50. However, this utility model can also be modified so that the third connecting part 321 of the grip component 30 is connected to the second connecting part 212 of the lever 21, and the fourth connecting part 123 of the frame 10 is connected to the first connecting part 211 of the lever 21. In this case, the third connecting part 321 will be a convex connecting part 50 and the fourth connecting part 123 will be a concave connecting part 60.

[0138] As can be seen from the above, the adjustable dumbbell structure 100 includes multiple convex joints 50 and multiple concave joints 60. The bar plates 21 are connected to each other, the bar plates 21 are connected to the grip assembly 30 by the connecting member 32, and the bar plates 21 are connected to the positioning member 12 of the frame 10 by the convex joints 50 and the concave joints 60, which will be further explained below.

[0139] like Figure 2 and Figure 3 As shown, the frame 11 of the bracket 10 includes two frame plates 111, each frame plate 111 including an extension 111a and two connecting sections 111b extending vertically from both ends of the extension 111a. Figure 4 and Figure 5 As shown, each positioning member 12 includes a housing piece 121 and a baffle piece 122. The housing piece 121 is fastened to one side of the baffle piece 122 by bolts, and the fourth connecting part 123 is fastened to the other side of the baffle piece 122 by bolts. The housing piece 121 includes an inner side surface 121a and an outer side surface 121b facing opposite directions. The inner side surface 121a is fixed to the baffle piece 122, and the outer side surface 121b is recessed with a connecting groove 121c. The two frame plates 111 are symmetrically disposed on the two opposite outer edges of each positioning member 12, and the two connecting sections 111b of each frame plate 111 are respectively bolted to the connecting grooves 121c of the outer shell pieces 121 of the two positioning members 12. Thus, the frame member 11 formed by the two frame plates 111 includes two facing inner sidewalls 112, and the two positioning members 12 are respectively fixed to the two inner sidewalls 112. The fourth joint portions 123 of the two positioning members 12 face each other and are used to detachably engage with the two adjustable weight units 20. Therefore, the two positioning members 12 and the frame member 11 can be firmly combined to form the frame 10, so that the dumbbells composed of the two adjustable weight units 20 and the grip assembly 30 can be stably placed on the frame 10 when not in use. In addition, the two adjustable weight units 20 allow users to remove some of the bar plates 21 to adjust the weight, and the removed bar plates 21 can also be securely stored in the frame 10.

[0140] like Figure 5 As shown, a temporary storage space 124 is formed between the outer shell 121 and the baffle 122 of each positioning member 12 of the bracket 10, and an access opening 125 communicating with the temporary storage space 124, so that the control member 40 can be inserted into the temporary storage space 124 through the access opening 125 for temporary storage. In other words, the temporary storage space 124 is used for the user to insert the control member 40 into the temporary storage space 124 to avoid loss when the control member 40 is not in use. In addition, the outer shell 121 is further recessed to form a latching groove 121d corresponding to the temporary storage space 124 and the access opening 125, and a latching rib 121f is protruded from the two side groove walls 121e of the latching groove 121d. When the control member 40 is inserted into the temporary storage space 124 through the access opening 125, the uppermost control part 41 of the control member 40 is exposed in the latching groove 121d. In addition, the control part 41 of the control member 40 has a plurality of arc-shaped latching grooves 411 with the same number and corresponding positions as the latching ribs 121f. When the control member 40 is inserted into the temporary storage space 124, each arc-shaped latching groove 411 and each latching rib 121f engage and position with each other, so that the control member 40 is more securely temporarily stored in the temporary storage space 124 to avoid falling off and being lost.

[0141] Please refer to Figures 4 to 10Each of the protruding joints 50 of the adjustable dumbbell structure 100, namely each of the fourth joints 123 and the first joint 211 in this embodiment, includes a first plate 51, a second plate 52, and a third plate 53. The first plate 51, the second plate 52, and the third plate 53 are stacked together to form an internal space 54. Specifically, the first plate 51 has a locking opening 512 formed on one of its outer edges 511, and extends from the locking opening 512 towards a first direction (i.e.,...). Figure 4 and Figure 9 A latching groove 513 extends into the interior of the first plate 51 (shown as the positive Y-axis direction), that is, the latching groove 513 communicates with the locking opening 512. The second plate 52 has an operation opening 522 formed on one of its outer edges 521, and extends from the operation opening 522 toward a second direction (i.e., Figure 4 and Figure 9 A control member receiving groove 523 (shown as negative Z-axis) extends into the interior of the second plate 52, that is, the control member receiving groove 523 communicates with the operation opening 522. The extension direction of the control member receiving groove 523 is the same as that of the temporary storage space 124 of the bracket 10, and the operation opening 522 and the access opening 125 face the same direction. The control member receiving groove 523 and the fastener receiving groove 513 together constitute the internal space 54, that is, the operation opening 522 and the latching opening 512 communicate with the internal space 54. The third plate 53 has a sliding groove 531 that extends laterally along the Y-axis (that is, parallel to the fastener receiving groove 513). In this embodiment, each of the protruding joints 50 has an operation opening 522 formed at its upper end and a latching opening 512 formed on its side, but the setting position of the operation opening 522 and the latching opening 512 in this utility model is not limited to this.

[0142] Each of the protruding joints 50 also includes a spring-loaded buckle assembly 70 installed in the internal space 54. In other words, the adjustable dumbbell structure 100 includes multiple spring-loaded buckle assemblies 70, the number of which is the same as the number of protruding joints 50. Each spring-loaded buckle assembly 70 includes an elastic member 71, a buckle piece 72, and a protruding post 73. The elastic member 71 includes a first end 711 and a second end 712. The first end 711 is disposed on the inner wall surface of the internal space 54, and the second end 712 is disposed on one end of the buckle piece 72. In this embodiment, a recessed limiting portion 514 is also laterally recessed in the buckle receiving groove 513. The first end 711 of the elastic member 71 is received in the limiting portion 514 and elastically abuts against the bottom surface of the groove, and the second end 712 is disposed on the buckle piece 72. The latch 72 is slidably disposed in the latch receiving groove 513. The protrusion 73 is disposed on one side of the latch 72 and protrudes into the control member receiving groove 523, and the end of the protrusion 73 is slidably disposed in the sliding groove 531 of the third plate 53. In this way, the portion of the protrusion 73 located in the control member receiving groove 523 corresponds to the operation opening 522 (e.g., Figure 13 As shown), that is, part of the protrusion 73 is located below the operating opening 522. Therefore, when the user inserts the control 40 into the control receiving slot 523 through the operating opening 522 (as shown), Figure 14 As shown), the control element 40 will abut against the protrusion 73, thereby causing the spring-loaded assembly 70 to actuate, which will be described in detail below.

[0143] Please refer to Figures 7 to 9 The adjustable dumbbell structure 100 includes each of the recessed joints 60, namely the third joints 321 and the second joints 212 in this embodiment, comprising a main plate 61, two front side plates 62, and two rear side plates 63. The two rear side plates 63 are spaced apart and stacked on one side of the main plate 61. The two front side plates 62 are then stacked on the two rear side plates 63. An assembly groove 64 is formed between the main plate 61, the two front side plates 62, and the two rear side plates 63, and at least one of the front side plates 62 has a snap-fit ​​groove 621 on its side facing the assembly groove 64. The convex joints 50 are detachably engaged with the assembly grooves 64 of the recessed joints 60, i.e., as shown in the figure. Figure 11 As shown, the multiple levers 21 of each adjustable weight unit 20 are stacked together with convex joints 50 and concave joints 60, and the convex joint 50 of one lever 21 is engaged with the concave joint 60 of the grip assembly 30, and so on. Figure 12As shown, the concave engagement portion 60 of the other lever 21 of each adjustable weight unit 20 is engaged with the convex engagement portion 50 of the frame 10, and the engagement of the convex engagement portions 50 and the concave engagement portions 60 is achieved by the fastener 72 of each convex engagement portion 50 engaging with its corresponding concave engagement portion 60 fastening groove 621, as detailed below.

[0144] like Figure 15 As shown, when a convex joint 50 and a concave joint 60 are engaged, the latch 72 of the convex joint 50 is elastically pushed by the elastic member 71 and is normally located in a locking position P1. When the latch 72 is in the locking position P1, a locking portion 721 of the latch 72 protrudes from the locking opening 512. Since the position of the latch 72 of the convex joint 50 corresponds to the locking groove 621 of the concave joint 60, when the latch 72 is in the locking position P1, its locking portion 721 can be engaged with the locking groove 621 of the concave joint 60. At this time, the convex joint 50 and the concave joint 60 are indeed firmly engaged with each other. When the user inserts the control member 40 through the operation opening 522 of any of the convex joint 50, the control member 40 extends into the control member receiving groove 523, thereby pushing against the protrusion 73 located in the internal space 54 (e.g., Figure 16 As shown), this causes the protrusion 73 to shift along the slide groove 531 and drive the fastener 72 to move along the fastener receiving groove 513 toward the elastic member 71 to a non-locking position P2 (as shown). Figure 17 As shown), during this process, the fastener 72 elastically compresses the elastic member 71, and the locking part 721 of the fastener 72 moves toward the internal space 54 and releases from the latching groove 621, so that the convex joint 50 and the concave joint 60 can separate from each other.

[0145] The aforementioned engagement and disengagement methods of the convex engagement portion 50 and concave engagement portion 60 are applied not only between lever plates 21, but also between the engagement member 32 of the adjustable weight unit 20 and the grip assembly 30, and between the adjustable weight unit 20 and the positioning member 12 of the frame 10. When the first engagement portion 211 of the adjustable weight unit 20 is engaged with the third engagement portion 321 of the grip assembly 30, the latch 72 of the first engagement portion 211 is located at the locking position P1 and is engaged in the latching groove 621 of the third engagement portion 321. To separate the two, simply insert the control member 40 through the operation opening 522 of the first engagement portion 211, moving the latch 72 of the first engagement portion 211 to the non-locking position P2, thereby separating the adjustable weight unit 20 from the grip assembly 30. When the second connecting part 212 of the adjustable weight unit 20 is connected to the fourth connecting part 123 of the frame 10, the fastening piece 72 of the fourth connecting part 123 is located in the locking position P1 and is engaged in the locking groove 621 of the second connecting part 212. When the two need to be separated, the control member 40 only needs to be inserted through the operation opening 522 of the fourth connecting part 123 to move the fastening piece 72 of the fourth connecting part 123 to the non-locking position P2, so that the adjustable weight unit 20 can be separated from the frame 10.

[0146] In order to smoothly move the latch 72 via the control member 40, the control member 40 in this embodiment has a special structural design. The control member 40 includes a body 42, a positioning part 43 and a driving part 44 connected sequentially downward from the control part 41. The control part 41 is elongated and hollowed out at the center. The body 42 is elongated. The positioning part 43 is located at the lower end of the body 42 and is recessed relative to the body 42. The driving part 44 is conical. In detail, when the control member 40 is inserted into the internal space 54 of the convex joint 50, the positioning part 43 further recesses to form an arcuate groove 431 corresponding to the location of the protrusion 73. After the control member 40 pushes the protrusion 73 to a position through the driving part 44 and the elastic member 71 is compressed synchronously, when the position of the protrusion 73 corresponds to the arcuate groove 431, the compressed elastic member 71 elastically resets and pushes the protrusion 73 to lock in the arcuate groove 431, and limits the length of the fastener 72 protruding from the locking opening 512. For example, in this embodiment, the fastener 72 does not protrude from the locking opening 512 at all. Figure 17 As shown, this can also achieve a proper positioning effect on the control component 40, preventing the control component 40 from falling off during use.

[0147] Furthermore, to ensure that the drive portion 44 of the control member 40 can smoothly push the protrusion 73, the drive portion 44 of the control member 40 has two guide bevels 442 formed between one end 441 and the arcuate groove 431. In this embodiment, the drive portion 44 of the control member 40 only needs to have a guide bevel 442 on one side corresponding to the protrusion 73, and is not limited to having guide bevels 442 on both sides. Each protrusion 73 is cylindrical. After the control member 40 is inserted into the operation opening 522 of the convex joint portion 50 with the drive portion 44, the drive portion 44 gradually pushes the protrusion 73 with the guide bevels 442 to move it. Figure 16 As shown, this allows for more reliable pushing of the protrusion 73, thereby more reliable movement of the latch 72 to the non-locking position P2.

[0148] According to the above description, when operating, the user only needs to pull out and insert the control member 40 to adjust the number of bars in each adjustable weight unit 20, thereby adjusting the weight of each adjustable weight unit 20. First, pull out the control member 40 that was originally inserted into the frame 10, and then insert the control member 40 into the operation opening 522 of the protruding joint 50 of one of the bars 21 according to the desired number of bars. For example, when the user wants the adjustable weight unit 20 connected to each joint 32 of the grip component 30 to have only two bars 21, such as... Figure 14 The control member 40 is inserted as shown. The control member 40 is inserted through the operating opening 522 and continuously moved until it can push against the protrusion 73. The protrusion 73, pushed by the control member 40, moves laterally. This movement of the protrusion 73 causes the latch 72 to move as well. Furthermore, the movement of the latch 72 pushes against the elastic member 71, causing it to elastically compress. Simultaneously, the locking portion 721 of the latch 72 gradually disengages from the latch slot 621. Once the latch 72 is completely disengaged from the latch slot 621, the user can grasp the handle 31, which lifts the adjustable weight unit 20, combined with the connecting parts 32, off the frame 10, thus enabling fitness training. For the user, adjusting the weight of the adjustable weight unit 20 can be achieved simply by inserting and removing the control member 40, saving effort and time, and making it easier to determine the selected weight based on the position of the control member 40. In contrast, existing technologies require adjusting the switching structure of each lever individually, which is time-consuming and prone to misjudgment. Furthermore, maintenance and repair are too labor-intensive and costly. This invention, however, saves users time and effort, as well as time and money spent on maintenance and repair.

[0149] Please refer to Figures 18 to 24The adjustable dumbbell structure 200 provided in the second preferred embodiment of this utility model is a kettlebell. Although the adjustable dumbbell structures 100 and 200 of the first and second preferred embodiments are dumbbell structures of different shapes, the bar plate connection methods they use are similar. The main difference between the adjustable dumbbell structure 200 of this embodiment and the first preferred embodiment is that the adjustable dumbbell structure 200 of this embodiment only includes one adjustable weight unit 20, and the internal space 54 of each bar plate 21A in this embodiment is equipped with two spring buckle assemblies 70. The structure of this embodiment will be further described below.

[0150] The adjustable dumbbell structure 200 includes an adjustable weight unit 20, a grip assembly 30, a control member 40, and a base 80. The adjustable weight unit 20 includes a plurality of bar plates 21A (three in this embodiment, but not limited to) that can be detachably stacked together. Each bar plate 21A includes a first connecting portion 211 and a second connecting portion 212 located on its two sides. The first connecting portion 211 of each pair of adjacent bar plates 21A is detachably connected to the other second connecting portion 212, such that the plurality of bar plates 21A are stacked together to form the adjustable weight unit 20. The grip assembly 30 includes a handle 31 and a connecting member 32 fixed to the handle 31. The handle 31 is curved, and both ends are fixed to the connecting member 32. The coupling 32 includes a base plate 322 and a third coupling portion 321. One side of the base plate 322 is integrally connected to the handle 31, and the third coupling portion 321 is bolted to the other side of the base plate 322. The third coupling portion 321 is detachably coupled to the first coupling portion 211 of one of the levers 21A of the adjustable weight unit 20. The base 80 includes a chassis 81 and a fourth coupling portion 82 located on one side of the chassis 81. The fourth coupling portion 82 is detachably coupled to the second coupling portion 212 of one of the levers 21A of the adjustable weight unit 20.

[0151] Furthermore, the first connecting portion 211 of each lever piece 21A is a convex connecting portion 50, and the second connecting portion 212 of each lever piece 21A is a concave connecting portion 60. Since the third connecting portion 321 of the gripping component 30 in this embodiment is connected to the first connecting portion 211 of one lever piece 21A, the third connecting portion 321 is similar to the second connecting portion 212 of the lever piece 21A, that is, a concave connecting portion 60. Additionally, in this embodiment, the fourth connecting portion 82 of the base 80 is connected to the second connecting portion 212 of one lever piece 21A, therefore the fourth connecting portion 82 is similar to the first connecting portion 211 of the lever piece 21A, that is, a convex connecting portion 50. However, this utility model can also be modified so that the third connecting part 321 of the grip component 30 is connected to the second connecting part 212 of the lever 21A, and the fourth connecting part 82 of the base 80 is connected to the first connecting part 211 of the lever 21A. In this case, the third connecting part 321 is a convex connecting part 50 and the fourth connecting part 82 is a concave connecting part 60.

[0152] As can be seen from the above, the adjustable dumbbell structure 200 includes multiple convex joints 50 and multiple concave joints 60. The bar plates 21A are connected to each other, the bar plates 21A are connected to the grip assembly 30 and the base 80 through the convex joints 50 and the concave joints 60. The technical features and beneficial effects of this part are similar to those of the first preferred embodiment, with only slight differences in structure. The differences will be explained below.

[0153] The base 80 has a chassis 81 comprising an upper plate 811 and a lower plate 812. The lower plate 812 is fixed to one side of the upper plate 811, and the fourth connecting part 82 is located on the other side of the upper plate 811. Two temporary storage slots 813 are formed between the upper plate 811 and the lower plate 812, and an access opening 814 communicating with the two temporary storage slots 813. The control member 40 includes a control part 41 and two extension parts 45 extending from the control part 41. The chassis 81 of the base 80 allows the two extension parts 45 of the control member 40 to be inserted into the two temporary storage slots 813 through the access opening 814, thereby temporarily storing the control member 40 in the chassis 81 to prevent loss.

[0154] Each of the protruding joints 50 of the adjustable dumbbell structure 200, namely each of the fourth joints 82 and the first joint 211 in this embodiment, includes a base plate 55, and a first plate 51, a second plate 52, and a third plate 53 sequentially stacked on the base plate 55 and locked with bolts. The functions of the first plate 51, the second plate 52, and the third plate 53 are similar to those provided in the first preferred embodiment, and they are stacked together to form the internal space 54. However, in this embodiment, the first plate 51 has two locking openings 512 facing opposite directions (in Figure 20 The image shows only one latching opening 512 located on one side of the convex joint 50 (with another latching opening 512 on the opposite side), and two latching tab receiving grooves 513 respectively communicating with the two latching openings 512, and two spring-loaded latching assemblies 70 are installed therein, with the latching tabs 72 of the two spring-loaded latching assemblies 70 respectively disposed in the two latching tab receiving grooves 513. In this embodiment, the second plate body 52 is composed of three long strips 524 spaced apart, thereby forming two operating openings 522 therebetween, and two control member receiving grooves 523 respectively communicating with the two operating openings 522, for the two extensions 45 of the control member 40 to extend into the two control member receiving grooves 523 through the two operating openings 522, and then push against the protrusions 73 of the two spring-loaded latching assemblies 70 respectively. However, even with two spring-loaded fastener assemblies 70 on each lever, only a single operating opening 522 and a single control member receiving groove 523 are required. This is sufficient as long as the control member 40, when inserted into the control member receiving groove 523, can simultaneously push against the protrusions 73 of both spring-loaded fastener assemblies 70. The third plate 53 has two sliding grooves 531, and the protrusions 73 of the two spring-loaded fastener assemblies 70 are slidably disposed in the two sliding grooves 531. It is worth noting that the convex joint 50 in this invention is not limited to having a sliding groove 531. Any other mechanism can be used to confine the spring-loaded fastener 70 within the internal space 54, such as using the control member receiving groove 523 to restrict the position of the protrusion 73. However, providing a sliding groove 531 allows for more precise control of the positions of the protrusion 73 and the fastener 72, making the locking and unlocking relationships between the convex joint 50 and the concave joint 60 more reliable.

[0155] The main difference between the snap fastener assembly 70 in this embodiment and the one provided in the first preferred embodiment is that each snap fastener assembly 70 includes two elastic elements 71, and the inner wall surface of the internal space 54 is correspondingly recessed in the fastener receiving groove 513 with two limiting portions 514, and the fastener 72 is also correspondingly recessed with two limiting portions 722. The first end 711 and the second end 712 of each elastic element 71 are respectively accommodated in the limiting portion 514 in the fastener receiving groove 513 and the limiting portion 722 of the fastener 72, and elastically abut against their inner surfaces. However, the number of elastic elements 71 in the snap fastener assembly 70 of this utility model is not limited, and different numbers of elastic elements 71 can be provided according to different design requirements.

[0156] The recessed joints 60 of the adjustable dumbbell structure 200, namely the third joints 321 and the second joints 212 in this embodiment, are similar to those provided in the first preferred embodiment. The main difference is that the recessed joints 60 in this embodiment include two facing snap-fit ​​slots 621, that is, the two snap-fit ​​slots 621 face opposite directions. The plurality of bar pieces 21A of the adjustable weight unit 20 are stacked in such a way that the convex joints 50 and the recessed joints 60 are joined together. The convex joint 50 of one bar piece 21A is joined to the recessed joint 60 of the grip component 30. In addition, the recessed joint 60 of the other bar piece 21A of the adjustable weight unit 20 is joined to the convex joint 50 of the base 80. The joining method of the convex joints 50 and the recessed joints 60 is that the two snap-fit ​​pieces 72 of each convex joint 50 are respectively engaged with the two snap-fit ​​slots 621 of its corresponding recessed joint 60, as detailed below.

[0157] like Figure 23 and Figure 24 As shown, the two latches 72 within each of the protruding joint portions 50 can be simultaneously controlled by the control member 40 extending into the internal space 54 from the operation opening 522 to switch between a locking position P1 and a non-locking position P2. The two latches 72 move in opposite directions; that is, when the two latches 72 move from their respective locking position P1 to the non-locking position P2, they move towards each other; when the two latches 72 move from their respective non-locking position P2 to the locking position P1, they move away from each other. When a latch 72 is in the locking position P1, a locking portion 721 of the latch 72 protrudes from the locking opening 512.

[0158] When the convex joint 50 and the concave joint 60 are engaged, the latch 72 of the convex joint 50 is elastically pushed by the elastic member 71 and is normally located in the locking position P1 and engaged in the locking groove 621 of the concave joint 60. At this time, the convex joint 50 and the concave joint 60 are indeed firmly engaged with each other. When the user inserts the control member 40 through the operation opening 522 of any of the convex joint 50, the control member 40 pushes against the protrusions 73 of the two spring-loaded fasteners 70 located in the internal space 54, causing the latches 72 of the two spring-loaded fasteners 70 to move in opposite directions to their respective non-locking positions P2 and release from the locking groove 621, so that the convex joint 50 and the concave joint 60 can be separated from each other. The aforementioned connection and separation method of the convex joint 50 and concave joint 60 is applied not only between the lever 21A and the lever 21A, but also between the lever 21A of the adjustable weight unit 20 and the connecting member 32 of the grip component 30, and between the lever 21A of the adjustable weight unit 20 and the base 80.

[0159] The control element 40 in this embodiment also has a structural design that allows for smoother movement of the latch 72, similar to that provided in the first preferred embodiment. Figure 23 As shown, each extension 45 of the control member 40 includes a body 42, a positioning part 43, and a driving part 44 sequentially connected to the control part 41. The driving part 44 is provided with a guide bevel 442, and the positioning part 43 is provided with an arc groove 431. After the control member 40 is inserted into the operation opening 522 by the driving part 44, the driving part 44 gradually pushes the protrusion 73 with the guide bevel 442, thus more reliably pushing the protrusion 73, and thus more reliably driving the latch 72 to move to the non-locking position P2. When the positions of the two protrusions 73 correspond to the arc groove 431, the compressed elastic member 71 elastically resets and pushes the two protrusions 73 into the arc groove 431, limiting the length of the two latches 72 protruding from the two locking openings 512. This also achieves a proper positioning effect on the control member 40, preventing the control member 40 from falling off during use.

[0160] Therefore, users can quickly remove some of the bar plates 21A of the adjustable dumbbell structure 200 or add more bar plates 21A by simply pulling out and inserting the control component 40, thereby adjusting the weight of the adjustable dumbbell structure 200. This adjustment method is not only labor-saving and time-saving, but also makes it easier to determine the selected weight by the position of the control component 40. Furthermore, the structure of this utility model is not too complicated, thus saving time and money on maintenance and repair.

[0161] Regardless of whether the first preferred embodiment provides a configuration with two adjustable weight units 20, or the second preferred embodiment provides a configuration with only one adjustable weight unit 20, the locking structure between the convex joint 50 and the concave joint 60 is not limited to the configurations provided in the above embodiments. As long as the convex joint 50 includes an internal space 54, a latch 72 disposed in the internal space 54, an operation opening 522 communicating with the internal space 54, and a locking opening 512, and the concave joint 60 includes a latching groove 621 capable of engaging with the latch 72 located at the locking position P1, and the convex joint 50 allows a control member 40 extending from the operation opening 522 into the internal space 54 to switch the latch 72 between the locking position P1 and the non-locking position P2, the configuration is acceptable. The following lists the third to fifth preferred embodiments, which utilize different locking structures to achieve similar beneficial effects to the first and second preferred embodiments.

[0162] It should be noted that in the first and second preferred embodiments described above, the control member 40 is inserted into the internal space 54 only through the operation opening 522 of the convex joint 50 when operation is required. However, in the third to fifth preferred embodiments described below, the control member is disposed in the internal space 54 and is not removed; therefore, each convex joint 50 is equipped with a control member. The phrase "the control member extends into the internal space through the operation opening" in this invention includes both the case where the control member is inserted into the internal space only through the operation opening when operation is required, and the case where the control member is always inserted into the internal space.

[0163] Please refer to Figures 25 to 29 The diagram shows the lever 21B and control member 40 provided in the third preferred embodiment of the present invention, thereby illustrating the locking structure between the convex joint 50 and the concave joint 60 provided in this embodiment. This locking structure can be applied between levers 21B, between levers 21B and the frame 10 or base 80 as described above, and between levers 21B and the gripping component 30 as described above.

[0164] The lever 21B in this embodiment is similar to that provided in the first preferred embodiment. The main difference is that the control member 40 can be linearly moved by a user and is switched between a retracted position P3 and an extended position P4 in the control member receiving groove 523. The control member 40 includes an inclined guide groove 46 and two positioning holes 47 and 48. A positioning post 515 is correspondingly provided on the first plate 51 of the convex joint 50. In addition, the buckle 72 is only fixed with the protruding post 73 and does not have a connecting elastic member. The protruding post 73 passes through the inclined guide groove 46 and the control member receiving groove 523 and extends into the sliding groove 531 of the third plate 53. When the control member 40 is in the retracted position P3, the positioning post 515 is located inside the positioning hole 47, the protrusion 73 is located at the upper end 461 of the inclined guide groove 46, and the fastener 72 is in the locking position P1. That is, at this time, the locking part 721 of the fastener 72 protrudes from the locking opening 512 and can engage with the snap groove 621 of the recessed joint 60. When the user pulls the control member 40 upward, the positioning post 515 will leave the positioning hole 47, and the control member 40 will slide upward along the control member receiving groove 523. The protrusion 73 is pushed by the inner wall of the inclined guide groove 46 and slides along the inclined guide groove 46 and along the sliding groove 531, driving the fastener 72 to slide along the fastener receiving groove 513, so that the locking part 721 of the fastener 72 gradually moves towards the internal space 54. When the control element 40 is in the extended position P4, the positioning post 515 is located in the positioning hole 48, the protruding post 73 is located at the lower end 462 of the inclined guide groove 46, and the fastener 72 is in the non-locking position P2. That is, at this time, the locking part 721 of the fastener 72 is retracted into the internal space 54 and will not engage with the snap groove 621 of the concave joint 60.

[0165] Therefore, the locking structure between the convex joint 50 and the concave joint 60 in this embodiment allows the user to switch the buckle 72 between the locked position P1 and the non-locked position P2 simply by moving the control member 40 linearly (i.e., pulling it up or inserting it down). This allows the user to quickly and conveniently adjust the number of weight plates on the dumbbell so that the weight of the dumbbell meets the user's needs. Furthermore, the structure of this utility model is not too complicated, thus saving time and money on maintenance and repair.

[0166] Please refer to Figures 30 to 35 The diagram shows the lever 21C and control member 40 provided in the fourth preferred embodiment of the present invention, thereby illustrating the locking structure between the convex joint 50 and the concave joint 60 provided in this embodiment. This locking structure can be applied between levers 21C, between levers 21C and the frame 10 or base 80 as described above, and between levers 21C and the gripping component 30 as described above.

[0167] The lever 21C in this embodiment is similar to that provided in the first preferred embodiment, with the main difference being that: the first plate 51 of the convex joint 50 is provided with two locking openings 512 facing opposite directions, and two fastener receiving grooves 513 respectively communicating with the two locking openings 512. Each fastener receiving groove 513 is provided with a fastener 72, and a protrusion 73 is fixed on each fastener 72. The front side plate 62 of the concave joint 60 is correspondingly provided with a snap-fit ​​groove 621 for the two fasteners 72 to engage. Furthermore, the first plate 51 is provided with a pivot 516, and the control member 40 is correspondingly provided with a pivot hole 49. The pivot 516 passes through the pivot hole 49, so that the control member 40 can be swung by a user and switched between a first angular position P5 and a second angular position P6 in the control member receiving groove 523. In addition, the control member 40 includes two inclined guide grooves 46 located on two opposite sides of the pivot hole 49, and the two protrusions 73 are respectively provided in the two inclined guide grooves 46.

[0168] When the control element 40 is located at the first angle position P5, the uppermost control part 41 of the control element 40 is biased towards one side of the operation opening 522, and the two fasteners 72 are respectively located at their locking positions P1. That is, at this time, the locking parts 721 of the two fasteners 72 protrude from the two locking openings 512 and can engage with the locking grooves 621 of the recessed joint 60. When the user moves the control part 41 of the control element 40 to the other side of the operation opening 522, the two protruding posts 73 are pushed by the inner walls of the two inclined guide grooves 46 and move in opposite directions and slide slightly in the inclined guide grooves 46, driving the two fasteners 72 to slide in opposite directions along the two fastener receiving grooves 513, so that the locking parts 721 of the two fasteners 72 gradually move towards the internal space 54. When the control element 40 is in the second angle position P6, the two fasteners 72 are respectively in their non-locking positions P2. That is, at this time, the locking parts 721 of the two fasteners 72 are retracted into the internal space 54 and will not engage with the snap groove 621 of the concave joint 60.

[0169] Therefore, the locking structure between the convex joint 50 and the concave joint 60 in this embodiment allows the user to switch the two buckles 72 between the locked position P1 and the non-locked position P2 simply by swinging the control member 40. This allows the user to quickly and conveniently adjust the number of weight plates on the dumbbell so that the weight of the dumbbell meets the user's needs. Furthermore, the structure of this utility model is not too complicated, thus saving time and money on maintenance and repair.

[0170] Please refer to Figures 36 to 40 The fifth preferred embodiment of the present invention shows the lever 21D and the control member 90, thereby illustrating the locking structure between the convex joint 50 and the concave joint 60 provided in this embodiment. This locking structure can be applied between levers 21D, between levers 21D and the frame 10 or base 80 as described above, and between levers 21D and the gripping component 30 as described above.

[0171] The lever 21D in this embodiment is similar to that provided in the first preferred embodiment, the main difference being that: the convex joint 50 includes two first plates 51 respectively disposed on both sides of the second plate 52, the two first plates 51 having opposite shapes, therefore the convex joint 50 includes two latching openings 512 facing opposite directions, and two latching slots 513 respectively communicating with the two latching openings 512, each latching slot 513 being provided with a latching piece 72. However, in this embodiment, only one first plate 51 and one latching piece 72 may be provided. Furthermore, in the above embodiments, the control member 40 indirectly drives the fastener 72 to move via the protrusion 73, while in this embodiment, the control member 90 is used by the user to directly drive the fastener 72 to move by rotation. The lowermost end of the control member 90 is provided with a gear portion 91, and each fastener 72 is correspondingly provided with a rack portion 723. The rack portions 723 of the two fasteners 72 mesh with the gear portion 91 of the control member 90. The second plate 52 is provided with a control member receiving groove 523 with a shape corresponding to the control member 90 and each fastener 72, so that the control member 90 can be rotatably disposed in the control member receiving groove 523. When the control member 90 is rotated, the gear portion 91 drives the two fasteners 72 to move in opposite directions between their respective locking position P1 and unlocked position P2. When the two fasteners 72 are in their locked position P1, the locking portions 721 of the two fasteners 72 protrude from the two locking openings 512 and can engage with the locking grooves 621 of the recessed joint 60. When the two fasteners 72 are in their non-locked position P2, the locking portions 721 of the two fasteners 72 retract into the internal space 54 and do not engage with the locking grooves 621 of the recessed joint 60.

[0172] Therefore, the locking structure between the convex joint 50 and the concave joint 60 in this embodiment allows the user to switch the two buckles 72 between the locked position P1 and the non-locked position P2 simply by rotating the control member 90. This allows the user to quickly and conveniently adjust the number of weight plates on the dumbbell so that the weight of the dumbbell meets the user's needs. Furthermore, the structure of this utility model is not too complicated, thus saving time and money on maintenance and repair.

[0173] Based on the above embodiments, this utility model provides a method for unlocking the plates of an adjustable dumbbell structure, the steps of which include:

[0174] An adjustable dumbbell structure (e.g., but not limited to the type provided in the first or second preferred embodiments) is provided, the adjustable dumbbell structure comprising a plurality of bar plates (e.g., but not limited to bar plates 21, 21A-21D provided in the first to fifth preferred embodiments) that can be detachably stacked together. Each bar plate includes a concave engagement portion 60 and a convex engagement portion 50 located on its two sides respectively. The concave engagement portion 60 includes a snap-fit ​​groove 621 (there may also be multiple snap-fit ​​grooves 621), and the convex engagement portion 50 includes an internal space. 54. A fastener 72 (or multiple fasteners 72) disposed in the internal space 54, and an operation opening 522 and a locking opening 512 (or multiple locking openings 512) communicating with the internal space 54, wherein the convex engagement portion 50 of each of two adjacent levers is detachably engaged with the other concave engagement portion 60, and the engagement method is such that a locking portion 721 of the fastener 72 of the convex engagement portion 50 protrudes from the locking opening 512 and engages with the locking groove 621 of the concave engagement portion 60;

[0175] A control element (e.g., but not limited to, the control elements 40, 90 provided in the first to fifth preferred embodiments) is provided, and the control element extends from the operation opening 522 of one of the levers into the internal space 54 (it can be inserted into the internal space 54 only when needed or always inserted into the internal space 54) and directly or indirectly abuts against the fastener 72 (e.g., the control element 90 in the fifth preferred embodiment directly abuts against the fastener 72, and the control element 40 in the first to fourth preferred embodiments indirectly abuts against the fastener 72); and

[0176] By using the control element to move the fastener 72, the locking part 721 of the fastener 72 moves toward the internal space 54 and releases its engagement with the latching groove 621.

[0177] With the adjustable dumbbell structure and bar plate unlocking method provided by this utility model, users can quickly and conveniently adjust the number of bar plates on the dumbbell so that the weight of the dumbbell meets the user's needs. Even if the weight is not suitable, it can be quickly readjusted, thereby saving adjustment time and avoiding the high maintenance and repair costs caused by the dumbbell's overly complex structure.

[0178] Finally, it must be stated again that the constituent components disclosed in the above embodiments of this utility model are merely illustrative examples and are not intended to limit the claims of this utility model. Substitutions or variations of other equivalent components should also be within the protection scope of this utility model.

Claims

1. An adjustable dumbbell structure, characterized in that, Includes: At least one adjustable weight unit, the adjustable weight unit comprising a plurality of levers that are detachably stacked together, each lever comprising a first connecting portion and a second connecting portion located on its two sides, wherein the first connecting portion of one of every two adjacent levers is detachably connected to the other second connecting portion. A grip assembly includes a handle and at least one coupling fixed to the handle, the coupling including a third coupling portion detachably coupled to one of a first coupling portion and a second coupling portion of one of the levers of an adjustable weight unit; and At least one control element; The adjustable dumbbell structure includes multiple concave joints and multiple convex joints. Each concave joint includes at least one latching groove, and each convex joint includes an internal space, at least one latching tab disposed in the internal space, and at least one operating opening and at least one locking opening communicating with the internal space. The latching tab includes a locking part, and the latching tab can be switched between a locked position and an unlocked position by a control member extending into the internal space from the operating opening; the first of each bar tab... The connecting part is the convex connecting part, the second connecting part of each lever is the concave connecting part, and the third connecting part of the grip assembly is one of the convex connecting part and the concave connecting part; when a convex connecting part and a concave connecting part are connected to each other, the buckle of the convex connecting part is located in the locking position, the locking part of the buckle protrudes from the locking opening and engages with the locking groove of the concave connecting part, when the buckle is switched to the non-locking position, the locking part moves toward the internal space and releases the engagement with the locking groove.

2. The adjustable dumbbell structure according to claim 1, characterized in that, The third joint of the gripping component is the concave joint, which allows the buckle of the first joint of the adjustable weight unit to engage with the buckle groove of the third joint when it is in the locking position.

3. The adjustable dumbbell structure according to claim 1, characterized in that, The grip assembly includes two adjustable weight units and two couplings, which are respectively fixed to both ends of the grip. The two adjustable weight units are detachably coupled to the third coupling of the two couplings.

4. The adjustable dumbbell structure according to claim 3, characterized in that, It also includes a frame, which includes a frame and two positioning members. The frame includes two facing inner sidewalls, and the two positioning members are respectively fixed to the two inner sidewalls. Each positioning member includes a fourth connecting part. The fourth connecting parts of the two positioning members face each other and are detachably connected to the two adjustable weight units. Each fourth connecting part is one of the convex connecting part and the concave connecting part.

5. The adjustable dumbbell structure according to claim 4, characterized in that, The fourth connecting portion of each positioning member of the frame is a convex connecting portion, for the snap-fit ​​groove of the second connecting portion of each adjustable weight unit to engage with the snap-fit ​​piece of the fourth connecting portion located in the locking position; the third connecting portion of each connecting member of the grip assembly is a concave connecting portion, for the snap-fit ​​piece of the first connecting portion of each adjustable weight unit to engage with the snap-fit ​​groove of the third connecting portion when located in the locking position.

6. The adjustable dumbbell structure according to claim 1, characterized in that, It contains only one adjustable weight unit, the grip assembly contains only one coupling, the grip is curved and both ends are fixed to the coupling.

7. The adjustable dumbbell structure according to claim 6, characterized in that, It also includes a base, which includes a fourth connecting part, which is detachably connected to one of the first connecting part and the second connecting part of one of the levers of the adjustable weight unit, wherein the fourth connecting part is one of the convex connecting part and the concave connecting part.

8. The adjustable dumbbell structure according to claim 7, characterized in that, The fourth connecting part of the base is the convex connecting part, which allows the snap groove of the second connecting part of the adjustable weight unit to engage with the snap piece of the fourth connecting part located in the locking position; the third connecting part of the grip assembly is the concave connecting part, which allows the snap piece of the first connecting part of the adjustable weight unit to engage with the snap groove of the third connecting part when it is located in the locking position.

9. The adjustable dumbbell structure according to claim 7, characterized in that, The base includes a chassis, which includes an upper plate and a lower plate. The lower plate is fixed to one side of the upper plate, and the fourth joint is located on the other side of the upper plate. At least one temporary storage slot is formed between the upper plate and the lower plate, and an access opening communicating with the temporary storage slot is provided for the control component to be temporarily stored by inserting it into the temporary storage slot through the access opening.

10. The adjustable dumbbell structure according to claim 1, characterized in that, It includes multiple snap fastener assemblies, and at least one snap fastener assembly is installed in the internal space of each convex joint. Each snap fastener assembly includes an elastic member, a snap fastener piece, and a protruding post. The elastic member includes a first end and a second end. The first end is located on the inner wall surface of the internal space, and the second end is located on one end of the snap fastener piece. The locking part of the snap fastener piece is located at the other end of the snap fastener piece. The snap fastener piece is normally located in the locking position when pushed by the elastic member. The protruding post is located on one side of the snap fastener piece and its position corresponds to the operation opening. The control member can be detachably inserted into the internal space of any of the convex joints. After the control member is inserted through the operating opening of any of the convex joints, the control member pushes against the protrusion located in the internal space, causing the pushed protrusion to move the fastener to the non-locking position and elastically compress the elastic member.

11. The adjustable dumbbell structure according to claim 10, characterized in that, Each of the concave joints includes two latching grooves facing opposite directions, each of the convex joints includes two latching openings facing opposite directions, and two latch receiving grooves respectively communicating with the two latching openings. The internal space of each of the convex joints is equipped with two spring-loaded fastener assemblies, and the latches of the two spring-loaded fastener assemblies are respectively disposed in the two latch receiving grooves. When the operating member is inserted through the operating opening of any of the convex joints, the operating member pushes against the protrusions of the two spring-loaded fastener assemblies located in the internal space, so that the latches of the two spring-loaded fastener assemblies move in opposite directions to their respective non-locking positions.

12. The adjustable dumbbell structure according to claim 11, characterized in that, The control member includes a control part and two extension parts extending from the control part; each of the protruding joints includes two operation openings and two control member receiving grooves respectively communicating with the two operation openings. When the control element is inserted into either of the protruding joints, the two extensions extend into the two control element receiving slots through the two operating openings, and then push against the protrusions of the two spring-loaded components respectively.

13. The adjustable dumbbell structure according to claim 1, characterized in that, Includes: A frame includes a frame and two positioning members. The frame includes two facing inner sidewalls. The two positioning members are respectively disposed on the two inner sidewalls. Each positioning member includes a fourth connecting part. The fourth connecting parts of the two positioning members face each other and are the convex connecting parts. The two adjustable weight units are detachably assembled with the two positioning parts of the frame, and the second connecting part of one of the levers of each adjustable weight unit is detachably assembled with the fourth connecting part of its corresponding positioning part. The grip assembly includes the grip and two connecting parts respectively assembled at both ends of the grip. The two adjustable weight units are detachably connected to the two connecting parts. The third connecting part of each connecting part is the concave connecting part and is detachably connected to the first connecting part of one of the levers of the corresponding adjustable weight unit. Multiple snap fasteners are respectively installed in the internal space of the convex joints. Each snap fastener includes an elastic element, a snap fastener piece, and a protruding post. The elastic element includes a first end and a second end. The first end springs against the inner wall surface of the internal space, and the second end is located at one end of the snap fastener piece. The locking part of the snap fastener piece is located at the other end of the snap fastener piece and is normally protruding from the locking opening and engaging with the snap fastening groove of the concave joint by the spring push of the elastic element. The protruding post is located on one side of the snap fastener piece and its position corresponds to the operating opening. as well as The control component can be detachably inserted into the internal space of any of the convex joints. After the control component is inserted through the operating opening of any of the convex joints, the control component pushes against the protrusion located in the internal space, causing the pushed protrusion to drive the fastener to elastically compress the elastic member, and at the same time release the fastener from the latching groove.

14. The adjustable dumbbell structure according to claim 10 or 13, characterized in that, Each of the protruding joints includes a first plate, a second plate, and a third plate. The first plate, the second plate, and the third plate are stacked together to form the internal space. The first plate includes a horizontally recessed fastener receiving groove and a limiting portion located within the fastener receiving groove. The second plate includes a vertically recessed control member receiving groove. The third plate includes a horizontally extending sliding groove. The first end of the elastic member of each snap fastener assembly is located at the limiting portion of the first plate of the protruding joint. The protrusion of each snap fastener assembly is slidably located in the sliding groove of the third plate of the protruding joint. After the control member is inserted through the operating opening of any of the protruding joints, it extends into the control member receiving groove of the second plate and pushes against the protrusion, causing the protrusion to move along the sliding groove of the third plate and drive the fastener to move towards the elastic member and compress it, while simultaneously releasing the fastener from the snap fastener and the snap fastener groove.

15. The adjustable dumbbell structure according to claim 10 or 13, characterized in that, The control component includes a control part, a body part, a positioning part, and a drive part connected in sequence. When the control component is inserted into the internal space of the convex joint, the positioning part is further recessed to form an arc groove corresponding to the location of the convex post. After the control component pushes the convex post with the drive part and the elastic member is compressed synchronously, when the position of the convex post corresponds to the arc groove, the compressed elastic member elastically resets and pushes the convex post to be locked in the arc groove, and limits the length of the buckle protruding from the latch opening.

16. The adjustable dumbbell structure according to claim 15, characterized in that, The drive part of the control member has a guide bevel between one end and the arc groove. Each of the protrusions is cylindrical. After the control member is inserted into the operation opening of the protrusion joint by the drive part, the drive part gradually pushes the protrusion to displacement by the guide bevel.

17. The adjustable dumbbell structure according to claim 4 or 13, characterized in that, Each of the positioning components of the bracket includes a housing and a baffle. The housing is fixed to one side of the baffle, and the fourth connecting part is fixed to the other side of the baffle. A temporary storage space is formed between the housing and the baffle, and an access opening communicating with the temporary storage space is provided so that the control component can be inserted into the temporary storage space through the access opening for temporary storage.

18. The adjustable dumbbell structure according to claim 17, characterized in that, The outer shell includes an inner side and an outer side facing opposite directions. The inner side is fixed to the baffle, and the outer side is recessed with a connecting groove. The frame includes two frame plates, each frame plate including an extension section and two connecting sections extending vertically from both ends of the extension section. The two connecting sections of each frame plate are respectively connected to the connecting grooves of the outer shells of the two positioning members.

19. The adjustable dumbbell structure according to claim 17, characterized in that, The outer shell is further recessed to form a snap-fit ​​groove corresponding to the temporary storage space and the access opening, and a snap-fit ​​rib is protruded on each of the two side walls of the snap-fit ​​groove. The control component is provided with multiple arc-shaped snap-fit ​​grooves. When the control component is inserted into the temporary storage space through the access opening, a part of the control component is exposed in the snap-fit ​​groove, and each arc-shaped snap-fit ​​groove and each snap-fit ​​rib are engaged and positioned with each other.

20. The adjustable dumbbell structure according to claim 1 or 13, characterized in that, Each of the recessed joints includes a main board, two front side plates and two rear side plates. The two rear side plates are fixed to one side of the main board. The two front side plates are stacked on the two rear side plates respectively. An assembly groove is formed between the main board, the two front side plates and the two rear side plates. A snap-fit ​​groove is formed on the side of at least one of the front side plates facing the assembly groove. The convex joints are detachably engaged with the assembly grooves.

21. The adjustable dumbbell structure according to claim 1, characterized in that, Each of the protruding joints includes a fastener receiving groove and a control member receiving groove. The fastener receiving groove is connected to the locking opening. The fastener is disposed in the fastener receiving groove and slides along the fastener receiving groove between the locking position and the non-locking position. The control member receiving groove is connected to the operation opening so that the control member can be disposed in the control member receiving groove.

22. The adjustable dumbbell structure according to claim 21, characterized in that, Each of the protruding joints includes a first plate, a second plate, and a third plate. The first plate, the second plate, and the third plate are stacked together to form the internal space. The latch opening is formed on the outer edge of the first plate. The latch receiving groove extends from the latch opening in a first direction into the interior of the first plate. The operating opening is formed on the outer edge of the second plate. The operating member receiving groove extends from the operating opening in a second direction into the interior of the second plate. The first direction and the second direction are perpendicular to each other.

23. The adjustable dumbbell structure according to claim 21, characterized in that, The device includes multiple control elements, each of which is mounted on a convex engagement portion. Each control element is linearly movable by a user and is switched between a retracted position and an extended position within a control element receiving groove. Each control element includes an inclined guide groove, and a protrusion is fixed on the latch piece within the inclined guide groove. When the control element switches between the retracted and extended positions, it pushes against the protrusion and slides along the inclined guide groove, causing the latch piece to switch between the locked and unlocked positions.

24. The adjustable dumbbell structure according to claim 21, characterized in that, The device includes multiple control elements, each of which is mounted on a protruding engagement portion. Each control element is swayable by a user and is positioned within a control element receiving groove, switching between a first angular position and a second angular position. Each control element includes an inclined guide groove, and a protruding post is fixed on the fastener and disposed within the inclined guide groove. When the control element switches between the first angular position and the second angular position, the control element pushes against the protruding post to move, causing the fastener to switch between the locked position and the unlocked position.

25. The adjustable dumbbell structure according to claim 24, characterized in that, Each of the protruding joints includes two locking openings facing opposite directions, two fastener receiving grooves respectively communicating with the two locking openings, two fasteners respectively disposed in the two fastener receiving grooves, and two protrusions respectively disposed in the two fasteners. The control member includes two inclined guide grooves, and the two protrusions are respectively disposed in the two inclined guide grooves. When the control member switches between the first angle position and the second angle position, the control member pushes against the two protrusions to move, causing the two fasteners to move in opposite directions to switch between the locking position and the non-locking position.

26. The adjustable dumbbell structure according to claim 21, characterized in that, The device includes multiple control elements, each of which is mounted on a protruding engagement portion. Each control element is rotatably disposed in a control element receiving groove by a user. Each control element includes a gear portion, and each latch includes a rack portion. The rack portion meshes with the gear portion. When the control element is rotated, the gear portion drives the latch to move between the locked position and the unlocked position.

27. The adjustable dumbbell structure according to claim 26, characterized in that, Each of the protruding joints includes two latching openings facing opposite directions, two latch receiving grooves respectively communicating with the two latching openings, and two latches respectively disposed in the two latch receiving grooves. The rack portion of the two latches meshes with the gear portion of the control member. When the control member is rotated, the gear portion drives the two latches to move in opposite directions between the latching position and the non-locking position.

28. A bar plate with an adjustable dumbbell structure, characterized in that, For unlocking by a control element; the lever includes a concave engagement portion and a convex engagement portion located on its two sides respectively. The concave engagement portion includes a snap-fit ​​groove. The convex engagement portion includes an internal space, a buckle disposed in the internal space, and an operating opening and a locking opening communicating with the internal space. The buckle includes a locking portion. The buckle can be switched between a locked position and a non-locked position by the control element extending into the internal space from the operating opening. When the buckle of the convex engagement portion is in the locked position, the locking portion of the buckle protrudes from the locking opening and is used to engage with the snap-fit ​​groove of the concave engagement portion of the other lever. When the buckle of the convex engagement portion switches from the locked position to the non-locked position, the locking portion of the buckle moves toward the internal space, thereby releasing the engagement with the snap-fit ​​groove.

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