Weight-adjustable dumbbell

Abstract

An adjustable weight dumbbell includes a handle assembly having a handle and a plate at each end. The outer side of each plate is configured to be removably coupled to one or more outer weights such that the total weight of the dumbbell is adjustable based on the number of connected outer weights. In addition, the inner side of each plate is configured to be removably coupled to an inner weight to further adjust the total weight of the dumbbell. The inner weight may be lighter than the outer weight. The adjustable weight dumbbell is supported on a bracket that facilitates attachment and removal of the outer and inner weights as needed or desired.

Description

[0001] Cross-citation of related applications

[0002] This application claims priority to U.S. Provisional Application No. 63 / 582,717, entitled “Adjustable weight dumbbell,” filed September 14, 2023, pursuant to 35 USC § 119(e), the entire contents of which are incorporated herein by reference. Background Technology

[0003] A dumbbell is a strength training device that typically includes a cylindrical grip handle with a pair of weight plates at opposite ends. The weight plates have a fixed weight, allowing different dumbbells to have different weights, and dumbbell sets are usually offered (e.g., discrete weights from 10 to 100 pounds or more) to provide users with varying dumbbell weights. At least some known dumbbells include a grip handle with slides at opposite ends, configured to selectively attach to the weight plates via locking mechanisms, allowing the user to add or remove weight as needed or desired. Improvements to these adjustable weight dumbbells are desirable.

[0004] The information contained in this background section (including any references cited herein and any descriptions or discussions thereof) is included for technical reference purposes only and should not be considered as a basis for limiting the scope of the invention as defined in the claims. Summary of the Invention

[0005] In the example implementation, the adjustable weight dumbbell includes a handle assembly, a first inner weight, and a second inner weight. The handle assembly includes a handle having a first end and an opposing second end. A first plate is mounted to the first end of the handle. The first plate has: a first inner side adjacent to the handle; a first outer side; and a first inner weight mounting structure positioned on the first inner side. A second plate is mounted to the second end of the handle. The second plate has: a second inner side adjacent to the handle and facing the first inner side; a second outer side; and a second inner weight mounting structure positioned on the second inner side. The first inner weight is configured to be removably coupled to the first inner weight mounting structure. The second inner weight is configured to be removably coupled to the second inner weight mounting structure.

[0006] In another example implementation, the adjustable weight dumbbell includes a handle assembly, a first inner weight, a second inner weight, and a plurality of outer weights. The handle assembly includes a handle having a first end and an opposing second end. A first plate is mounted to the first end of the handle. The first plate has: a first inner side and a first outer side; a first inner weight bracket disposed on the first inner side; and a first outer weight bracket disposed on the first outer side. A second plate is mounted to the first end of the handle. The second plate has: a second inner side and a second outer side, the second inner side facing the first inner side of the first plate; a second inner weight bracket disposed on the second inner side; and a second outer weight bracket disposed on the second outer side. The first inner weight is configured to be removably coupled to the first inner weight bracket. The second inner weight is configured to be removably coupled to the second inner weight bracket. The first and second inner weights at least partially surround the handle when coupled to the handle assembly. The plurality of outer weights are configured to be removably coupled to the first and second outer weight brackets and removably coupled to each other to adjust the weight of the adjustable weight dumbbell.

[0007] This invention is provided to introduce, in a simplified form, the selection of concepts further described in the detailed embodiments below. This invention is not intended to identify key or essential features of the claimed subject matter, nor is it intended to limit the scope of the claimed subject matter. Details of one or more examples are set forth in the drawings and the following description. Various features, objects, and advantages of these examples will be apparent from the specification, drawings, and claims. Furthermore, it should be understood that both the foregoing summary of this disclosure and the following detailed description are exemplary and intended to provide further explanation, and not to limit the scope of this disclosure. Attached Figure Description

[0008] The following drawings, which form part of this application, are used to illustrate the described technology and are not intended to limit the scope of this disclosure as defined by the appended claims in any way.

[0009] Crosshairs are commonly used in accompanying drawings to indicate surfaces where sections are cut. Contours, shading, or stippling are commonly used in accompanying drawings to indicate surface features (including variations in curvature or depth), to define boundaries between adjacent elements, and to enhance readability. Therefore, the presence or absence of crosshairs, contours, shading, or stippling does not indicate or suggest a preference or requirement for any particular material, material properties, element scale, element dimensions, commonalities with similar illustrated elements, or any other characteristic, attribute, or property of any element shown in the accompanying drawing.

[0010] Additionally, it should be understood that the scale and dimensions (relative or absolute) of various features and elements (and their sets and groups) provided in the accompanying drawings, as well as the boundaries, separations and positional relationships between them, are provided only to facilitate understanding of the various exemplary embodiments described herein, and therefore may not necessarily be presented or illustrated to scale, and are not intended to indicate any preference or requirement for the illustrated embodiments to exclude the embodiments described therein.

[0011] Figure 1 An isometric view depicting an exemplary adjustable weight dumbbell supported on a bracket is shown.

[0012] Figure 2 Depicting Figure 1 An isometric view of the handle assembly of the adjustable weight dumbbell shown.

[0013] Figure 3 Depicting Figure 2 The exploded isometric view of the handle assembly shown.

[0014] Figure 4 Depicting Figure 1 The rear view of the left inner counterweight of the adjustable weight dumbbell shown.

[0015] Figure 5 Depicting Figure 4 The front view of the left inner counterweight shown.

[0016] Figure 6 Depicting Figure 4 The exploded view, top view, and rear isometric view of the left inner counterweight are shown.

[0017] Figure 7 Depicting Figure 1 The left-side front view of the adjustable weight dumbbell with the left-side external counterweight shown.

[0018] Figure 8 Depicting Figure 7 The right-side front view of the left-side external counterweight shown.

[0019] Figure 9 Depicting Figure 7 The exploded isometric view of the left outer counterweight shown.

[0020] Figure 10 Depicting Figure 1 An isometric view of the adjustable weight dumbbell holder shown.

[0021] Figure 11 Depicting Figure 10 The bracket shown is partially exploded isometric view.

[0022] Figure 12 Depicting Figure 1Isometric view of a section of the adjustable weight dumbbell shown. Detailed Implementation

[0023] An example of this technology relates to an adjustable weight dumbbell. The adjustable weight dumbbell has a handle assembly configured to allow attachment of one or more removable weights to define the total weight of the dumbbell. The handle assembly includes a handle with plates attached to both ends. The outer sides of the plates are configured to be removably coupled to one or more external weights. The external weights can also be removably coupled to each other, allowing multiple external weights to be stacked on each plate of the handle assembly. Additionally, the inner sides of the plates are configured to be removably coupled to corresponding internal weights. The internal weights are lighter than the external weights, allowing the adjustable weight dumbbell to add smaller weight increments between larger external weight increments. The shape and size of the internal weights are designed to avoid interference with the handles during use and to position the center of gravity of the internal weights substantially along the longitudinal axis of the handles. In some example implementations, the plates may be constructed of two different materials to facilitate manufacturing and attachment of the weights. Furthermore, a bracket can be provided to support the adjustable weight dumbbell and facilitate the addition and removal of weights. This bracket facilitates the scalability of the adjustable weight dumbbell with additional external weights as needed or desired.

[0024] In this specification, references to the orientation of dumbbell components (e.g., front, back, top, bottom, back, right, left, up, down, etc.) relate to the position of the dumbbell components when supported on the bracket and are used solely for ease of description and illustration. The use of terminology is not intended to limit how the dumbbell components can be positioned. As used herein, the terms "axial" and "longitudinal" refer to a direction and orientation extending substantially parallel to the centerline of the component or system. Furthermore, the terms "radial" and "radially" refer to a direction and orientation extending substantially perpendicular to the centerline of the component or system. Additionally, as used herein, the terms "circumferential" and "circumferentially" refer to a direction and orientation extending in an arc around the centerline of the component or system.

[0025] Figure 1An isometric view of an exemplary adjustable weight dumbbell 100 supported on a bracket 102 is depicted. The adjustable weight dumbbell 100 includes: a handle assembly 104; a first left inner weight 106; a second right inner weight 108; and a plurality of outer weights 110a to 110h. In the example, the handle assembly 104 has a weight of 5 pounds (lbs) (2.27 kg). Each of the inner weights 106, 108 may have a weight of 2.5 lbs (1.13 kg) and may be configured to be removably attached to the handle assembly 104, allowing weights to be added or removed from the handle assembly 104. In some examples, each of the inner weights 106, 108 may have a weight of 5 lbs (2.27 kg), etc. Additionally, each of the outer weights 110 may have a weight of 5 lbs (2.27 kg) and may be configured to be removably attached to the handle assembly 104, allowing weights to be added or removed from the handle assembly 104. In some examples, each of the external weights 110 may have a weight of 7.5 lbs (3.4 kg), 10 lbs (4.54 kg), etc. The external weights 110 may also be removably connected to each other, allowing additional weights to be added or removed from the handle assembly 104 as needed or desired. As shown, the adjustable weight dumbbell 100 can be configured for a total weight between 5 lbs (2.27 kg) and 50 lbs (22.68 kg), adjustable in 5 lbs (2.27 kg) increments.

[0026] In the example, the inner weights 106 and 108 are different from the outer weight 110, such that the inner weights 106 and 108 cannot be connected or used as outer weights, and the outer weight 110 cannot be connected or used as an inner weight. The outer weight 110 has left and right configurations, such that the outer weight 110 is symmetrical about the handle assembly 104. Similarly, the inner weights 106 and 108 have left and right configurations and are different from each other, such that the inner weights 106 and 108 are symmetrical about the handle assembly 104.

[0027] The bracket 102 may include a cover 112 with two rows of weight markings. The first row 114 corresponds to the use of external weights 110 only on the handle assembly 104, and the second row 116 corresponds to the use of internal weights 106, 108 and external weights 110 on the handle assembly 104. The bracket 102 may also include one or more spacers 118 to allow the use of more or fewer external weights 110. For example, by removing the spacers 118 on both sides of the adjustable weight dumbbell 100, two additional external weights 110 can be added, increasing the total weight to 60 lbs (27.22 kg). Alternatively, by removing some external weights 110 and adding additional spacers 118, the total weight can be reduced as needed or desired. This configuration of the bracket 102 allows users to start with fewer external weights 110 and upgrade with additional external weights 110 while still using the bracket 102 and handle assembly 104. The bracket 102 also includes a first end plate 120 and a second end plate 122 defining a cavity 124, the cavity being configured to store internal counterweights 106, 108 when not in use.

[0028] Figure 2 An isometric view of the handle assembly 104 is depicted. Figure 3 An exploded isometric view of the handle assembly 104 is depicted. (See also...) Figure 2 and Figure 3 The handle assembly 104 forms an adjustable weight dumbbell 100 (e.g., Figure 1 The main components (shown) are the handle assembly, which a user grips for strength training, and to which additional weights are selectively attached. The handle assembly 104 includes a cylindrical handle 126 having a first end 128 defining a longitudinal axis 132 and an opposing second end 130. A first plate 134 is mounted to the first end 128 of the handle 126, for example, by fasteners 136 and washers 138. A second plate 140 is mounted to the second end 130 of the handle 126, for example, by similar fasteners 136 and washers 138. The handle 126 may include knurling (not shown) on its outer surface to increase the user's grip strength.

[0029] In the illustrated implementation, the first plate 134 has a first inner side 142 adjacent to a first end 128 of the handle 126 and an opposing first outer side 144. The second plate 140 has a second inner side 146 adjacent to a second end 130 of the handle 126 and an opposing second outer side 148. The first inner side 142 of the first plate 134 faces the second inner side 146 of the second plate 140, while the first outer side 144 of the first plate 134 faces away from the second outer side 148 of the second plate 140. Each of the first inner side 142, the first outer side 144, the second inner side 146, and the second outer side 148 lies substantially in a corresponding parallel plane, each of which is transverse to the longitudinal axis 132. The inner sides 142, 146 of the first plate and the second plate 134 are respectively configured as follows (e.g., Figure 2 (As shown) Receives and supports internal counterweights 106 and 108 (e.g.) Figure 1 As shown), and the outer sides 144 and 148 of the first plate and the second plate 134 are respectively configured as follows (as shown). Figure 2 (As shown) Receives and supports external counterweight 110 (e.g.) Figure 1 (As shown). More specifically, the inner sides 142 and 146 each include an inner counterweight mounting portion 150, to which inner counterweights 106 and 108 are removably connected. Additionally, the outer sides 144 and 148 each include an outer counterweight mounting portion 152, to which an outer counterweight 110 is removably connected. The inner counterweight mounting portions 150 and outer counterweight mounting portions 152 on each of the first plate 134 and the second plate 140 face opposite directions relative to the longitudinal axis 132.

[0030] Reference Figure 2 In the best-understood example implementation, the inner counterweight mounting portion 150 can be understood as a bracket extending from each of the inner sides 142, 146. The inner counterweight mounting portion 150 has a bottom end 154 adjacent to the handle 126 and a top end 156 radially spaced from the handle 126 and directed toward the top of the handle assembly 104. The bottom end 154 has a width 158 longer than the width 160 of the top end 156. Therefore, the inner counterweight mounting portion 150 has a trapezoidal shape, with a smaller taper at the top end 156 and a larger taper at the bottom end 154. Thus, the inner counterweights 106, 108 slide in from the top side of the handle assembly 104 and engage with the inner counterweight mounting portion 150. A portion of the outer periphery of the inner counterweight mounting portion 150 forms dovetail flanges 162 for engaging the corresponding edges of the inner counterweights 106, 108. The dovetail flange 162 is axially spaced from the inner sides 142 and 146 of the plates 134 and 140, such that the inner counterweights 106 and 108 are restricted from axial movement during attachment. Between the bottom end 154 and the top end 156, the inner counterweight mounting portion 150 defines a transverse groove 164, which is configured to engage with the locking mechanism of the inner counterweights 106 and 108, as further described below.

[0031] The inner counterweight mounting part 150 can be secured to the first plate 134 or the second plate 140 by one or more fasteners 166 and corresponding connecting sleeves 168 (e.g., integrated nuts and washers). The inner counterweight mounting part 150 is located on the top side of the handle 126, so that the inner counterweights 106, 108 can be connected to the handle assembly from the top side of the handle assembly 104.

[0032] A pair of support pillars 170 extend between the inner sides 142, 146 of plates 134, 140. The support pillars 170 are parallel to and offset from the axis 132 of the handle 126, and are secured at each end to plates 134, 140 by corresponding fasteners 172. In an example implementation, the support pillars 170 are positioned radially away from the handle 126, close to the circumferential edges of plates 134, 140, and spaced apart from each other by an arc length 161. In some example implementations, each of the support pillars 170 has the same radial distance from the longitudinal axis 132 of the handle 126, and the length of the chord spacing between the support pillars 170 is the same as the radial distance of the support pillars 170 from the longitudinal axis 132, such that the handle 126 and the support pillars 170 form an equilateral triangle. The support pillars 170 are further positioned on the side of the handle 126 opposite to the inner counterweight mounting portion 150, generally facing the bottom of the handle assembly 104. The support pillars 170 increase the structural rigidity of the handle assembly 104, for example, by resisting impact forces when one or more external weights 110 of the adjustable weight dumbbell 100 are dropped from a significant height onto a hard surface. In the example implementation, the support pillars 170 are separate from each other, with no other components spanning between them except for the first plate 134 and the second plate 140.

[0033] Each of the first plate 134 and the second plate 140 is formed of an inner plate 174 and an outer plate 176, which are joined together by fasteners 178 and inserts 180 (e.g., drilled tap nuts with unique shapes) and other fasteners described herein. In an example implementation, the insert is typically triangular or wedge-shaped and designed to engage with a wedge-shaped recess 181 formed in the outer plate 176 to prevent rotation of the insert 180. The inner plate 174 may be a stamped metal sheet and formed of a different material than the outer plate 176, which may be a molded plastic sheet. By using a stamped metal sheet as the inner plate 174, the weight of the handle assembly 104 is easier to control compared to using a casting process. Additionally, the stamped metal sheet has a reduced thickness, allowing the longitudinal length 182 of the handle 126 to be extended and to accommodate the inner counterweights 106, 108. In the example, the longitudinal length 182 of the handle 126 between the inner sides 142, 146 of the first plate 134 and the second plate 140 can be 130 mm or greater.

[0034] The outer counterweight mounting portion 152 is integrally formed on the outer plate 176 as a generally V-shaped protrusion on the outer surfaces 144 and 148. The outer counterweight mounting portion 152 has a top end 184, the width of which 186 is greater than the width of which 188 is greater than the width of which ... Figure 9 In this configuration, adjacent outer counterweights 110d / e are connected to the first plate 134 and the second plate 140. In other words, the outer counterweights 110d / e slide upwards 191 from the bottom of the handle assembly 104 to attach to the first plate 134 and the second plate 140. Conversely, the inner counterweights 106 and 108 slide downwards 193 from the top of the handle assembly 104 to engage the inner counterweight mounting portions 150 on the inner sides 142 and 146 of the first plate 134 and the second plate 140, respectively. The inner counterweights 106 and 108 and the outer counterweight 110 are thus attached to the handle assembly 104 from opposite directions.

[0035] In the example, the width 186 of the top end 184 of the outer counterweight mounting portion 152 is longer than both the bottom width 158 and the top width 160 of the inner counterweight mounting portion 150, while the width 188 of the bottom end 190 of the outer counterweight mounting portion 152 is shorter than both the bottom width 158 and the top width 160 of the inner counterweight mounting portion 150. Therefore, the cone angle of the outer counterweight mounting portion 152 can be smaller than the cone angle of the inner counterweight mounting portion 150.

[0036] A portion of the outer periphery of the outer counterweight mounting portion 152 forms a dovetail flange 192 for engaging the corresponding edge of the outer counterweight 110. The dovetail flange 192 is axially spaced from the outer sides 144, 148 of the plates 134, 140. When engaged with the outer counterweight mounting portion 152, the outer counterweight 110 is restricted from axial movement by the dovetail flange 192. Between the bottom end 190 and the top end 184, the outer counterweight mounting portion 152 includes a transverse groove 194 configured to engage with a locking mechanism of the outer counterweight 110, as further described below.

[0037] The outer plate 176 defines an outer counterweight mounting portion 152 configured for sliding engagement with a corresponding outer counterweight 110. Therefore, the surface texture of a first region 196 of the outer plate 176 adjacent to the outer counterweight mounting portion 152 can have a tight or close engagement tolerance with the outer counterweight 110d / e. Thus, the first region can be relatively smooth (i.e., having a low coefficient of friction) to provide low-friction contact with the outer counterweight 110d / e. Conversely, a second region 198 of the outer plate 176 away from the outer counterweight mounting portion 152 can be positioned directly adjacent to the outer counterweight 110, but does not have a similar tight engagement tolerance. Therefore, the surface texture of the second region 198 can be rougher, i.e., having a higher coefficient of friction, thereby increasing friction and reducing movement of the outer counterweight 110d / e relative to the first and second plates when engaged with the first plate 134 and the second plate 140. Additionally, the rougher surface texture of the second region 198 can reduce the appearance of wear (e.g., scratches) on the outer surface. The surface texture of the first region 196 can be considered smoother than the surface texture of the second region 198, while the surface texture of the second region 198 can be considered rougher than the surface texture of the first region 196. In one example, the surface roughness of the textures of the first region 196 and the second region 198 can be quantified by the Ra parameter value, but other parameter values ​​can be used alternatively or separately. In the example implementation, the second region 198 can be greater than 50% of the total surface area of ​​the outer regions 144, 148, or greater than 60% of the total surface area of ​​the outer regions 144, 148, or greater than 70% of the total surface area of ​​the outer regions 144, 148, or more.

[0038] Additional views of the handle assembly 104 are shown in several corresponding U.S. design patent applications filed on September 14, 2023, each entitled “Handle for Adjustable Weight Dumbbell” (Attorney General’s Case Nos. 2355.10082.00US-D and 2355.10088.00US-D), the entire contents of which are incorporated herein by reference.

[0039] Figure 4 The adjustable weight dumbbell 100 (as described) Figure 1 The left front view of the left inner counterweight 106 (shown). Figure 5 The right-side front view of the left inner counterweight 106 is depicted. Figure 6 An exploded isometric view of the left inner counterweight 106 is depicted. (See also...) Figures 4 to 6 Although the left inner weight 106 is shown and described, it should be understood that the right inner weight 108 (as shown) Figure 1The inner weight 108 (as shown) has a substantially similar configuration, only mirror-symmetrical about the longitudinal axis. Therefore, the right inner weight 108 is not described separately here, and the description of the left inner weight 106 also applies to the right inner weight 108. The left inner weight 106 has a body 200 and a locking mechanism 202 configured to secure the left inner weight 106 to the handle assembly 104 (as shown). Figures 2 to 3 As shown), the left inner weight 106 at least partially surrounds the handle 126 when connected to the handle assembly 104 (as shown). Figure 2 (As shown).

[0040] The body 200 of the left inner counterweight 106 is substantially chordally truncated in the shape of a disk, and defines a notch 204 within the chord wall 203. The shape and size of this notch are designed to at least partially receive the handle 126 when attached to the handle assembly 104. The body 200 defines most of the mass of the left inner counterweight 106, and when attached to the handle assembly 104, the body is positioned on the top side of the handle assembly 104 such that the chord wall 203 is located above the support post 170. To maintain weight balance of the handle assembly 104 about the longitudinal axis 132, the shape or geometry of the body 200 positions the center of mass 206 of the left inner counterweight 106 outside the body 200. In one example, the center of mass 206 is located within the notch 204 and within the handle 126 as the handle 126 extends through the notch 204. In another example, the center of mass 206 may be aligned with the longitudinal axis 132 of the handle assembly 104. In yet another example, the center of mass 206 may be offset from the longitudinal axis 132 of the handle assembly 104. In some examples, the body 200 may include one or more recesses 208 or openings to form a desired weight distribution, such that when the left inner counterweight 106 engages with the inner counterweight mounting portion 150, the center of mass 206 is located relative to the body within the recess 204, along the longitudinal axis 132, or elsewhere as needed. The recesses 208 may be defined on a first side 210 or a second side 212 of the body 200, or on both sides.

[0041] The first side 210 of the main body 200 is configured to face the inner sides 142 and 146 of the first plate 134 and the second plate 140 (depending on whether the first side 210 corresponds to the left inner counterweight 106 or the right inner counterweight 108). The first side 210 of the main body 200 defines a mounting receiving part 214 for connection to the inner counterweight mounting part 150 (e.g., Figure 2(As shown). In the example, the mounting receiving portion 214 is defined as a cavity, the shape and size of which are designed to receive the inner counterweight mounting portion 150. The mounting receiving portion 214 may be integrally or integrally formed within the counterweight body 200. The mounting receiving portion 214 also has a dovetail flange 216 surrounding the periphery of the cavity, and when the mounting receiving portion 214 slides into engagement with the inner counterweight mounting portion 150, the dovetail flange engages with the corresponding dovetail flange 162 of the inner counterweight mounting portion 150. The shape of the cavity of the mounting receiving portion 214 corresponds to the shape of the inner counterweight mounting portion 150 and has a similar trapezoidal shape, wherein the shorter width faces the top of the body 200 and the longer width faces the bottom of the body 200. A transverse groove 218 is also defined within the mounting receiving portion 214.

[0042] To prevent the left inner counterweight 106 from disengaging from the inner counterweight mounting portion 150, the locking mechanism 202 can be used to limit any radial sliding movement between the inner counterweight mounting portion 150 and the mounting portion receiving portion 214. A chamber 220 is defined on a first side 210 of the body 200 adjacent to the mounting portion receiving portion 214 and is configured to support the locking mechanism 202. The locking mechanism 202 includes a lever arm 222 and a locking pin 224. The lever arm 222 is pivotally mounted within the chamber 220 via a pivot pin 226. The upper arm portion 228 of the lever arm 222 extends from the body 200 and includes a knob 230. The lower arm portion 232 of the lever arm 222 includes a head 234 that engages with a recess 236 in the sidewall of the locking pin 224. A biasing spring 238 (e.g., a torsion spring) provides a biasing force to the lever arm 222 and orients the lever arm 222 toward one or both of a locked and unlocked position. The cover 240 secures the components of the locking mechanism 202 within the chamber 220 by one or more fasteners 242.

[0043] Locking pin 224 is oriented laterally to longitudinal axis 132 (e.g.) Figure 2 As shown), and configured to slide into and out of the transverse groove 218 of the mounting receiving portion 214 via the operation of the lever arm 222. When the locking pin 224 is disposed within the transverse groove 218 of the mounting receiving portion 214, the locking mechanism 202 is in the locked position. At least a portion of the locking pin 224 extends axially from the transverse groove 218 and is received within a corresponding transverse groove 164 of the inner counterweight mounting portion 150 to restrict the removal of the left inner counterweight 106 from the inner counterweight mounting portion 150. When the locking mechanism 202 is in the unlocked position, the locking pin 224 is removed from the transverse groove 218, and the inner counterweight 106 can be slidably removed from the inner counterweight mounting portion 150. The distal end 244 of the locking pin 224 may define a tapered nose to facilitate sliding the locking pin 224 into the transverse groove 218 and placing the locking mechanism 202 in the locked position.

[0044] In the example, the inner weight 106 can be attached to the inner sides 142, 146 of the first plate 134 and the second plate 140. The body 200 has a thickness 246 that extends inward parallel to the longitudinal axis 132 above the handle 126. The handle 126 can therefore be designed to be long enough for a user to use the adjustable weight dumbbell 100 as needed or desired, whether or not it has the inner weights 106, 108. In one example, when both the first inner weight 106 and the second inner weight 108 are attached to the handle assembly 104, the available length between the first inner weight 106 and the second inner weight 108 of the handle 126 can be 125 mm or longer.

[0045] In one example implementation, the body 200, defined at the bottom portion 248, partially surrounds the handle 126 and connects with the support pillar 170 (as shown). Figure 2 (As shown) The thickness 246 of the joint is thicker than the rest of the body 200. For example, the top portion 250 of the second side 212 of the body 200 may define a slope 252 that tapers toward the first side 210 of the body 200, such that the body 200 has a reduced thickness at the top portion 250. The slope 252 facilitates providing more space for the user to grip the handle 126 when using the adjustable weight dumbbell 100. If the effective length of the handle 126 is too narrow, it will be more difficult for the user to use the adjustable weight dumbbell 100. In some example implementations, the slope 252 may include 10%, 15%, 20%, 25% or more of the height of the body 200 above the bottom portion 248.

[0046] Additional views of the internal weights 106 and 108 are depicted in the corresponding U.S. design patent application (Attorney General’s File No. 2355.10083.00US-D), filed September 14, 2023, entitled “Weight for Adjustable Weight Dumbbell,” the entire contents of which are incorporated herein by reference.

[0047] Figure 7 The adjustable weight dumbbell 100 (as described) Figure 1 The left front view of the left external counterweight 110a (shown). Figure 8 The right-side front view of the left-side external counterweight 110a is depicted. Figure 9 An exploded isometric view of the left outer counterweight 110a is depicted. (See also...) Figures 7 to 9 Although the left outer weight 110a is shown and described, the other left outer weights 110b to 110d are identical. Furthermore, it should be understood that the right outer weights 110e to 110h (e.g.) Figure 1The outer weights 110a to 110d (as shown) have a configuration substantially similar to the left outer weights 110a to 110d, only mirror-symmetrical about the longitudinal axis. Therefore, the right outer weights 110e to 110h are not described separately here, and the description of the example left outer weight 110a also applies to all outer weights 110a to 110h. The outer weight 110a has a body 254 and a locking mechanism 256 configured to secure the outer weight 110a to the handle assembly 104 (as shown). Figures 2 to 3 (as shown) and fix other external counterweights 100b to 100d.

[0048] The main body 254 forms most of the mass of the external counterweight 110a and has a first side 258 and a second side 260. The first side 258 is a substantially flat surface, to which the external counterweight mounting part 262 is connected by fasteners 166 and connecting sleeves 168. The function of the external counterweight mounting part 262 is similar to that of the first plate 134 and the second plate 140 of the handle assembly 104 (e.g., ...). Figure 2 The external counterweight mounting portion 152 shown is the same as that shown, and includes a dovetail flange 264 and a transverse groove 266, so that another external counterweight can be removably attached to the first side 258 as needed or desired.

[0049] The second side 260 of the main body 254 defines a first chamber 268 and a second chamber 270. The first chamber is shaped and sized to at least partially receive the locking mechanism 256, and the second chamber is shaped and sized to at least partially receive the external counterweight receiving portion 272. In an example, the external counterweight receiving portion 272 defines a cavity shaped and sized to receive the external counterweight mounting portion 262 of another external counterweight 110b to 110d or the plate of the handle assembly 104. The external counterweight receiving portion 272 is connected to the main body 254 and the external counterweight mounting portion 262 by fasteners 166 and connecting sleeves 168. In one example, the external counterweight receiving portion 272 and the external counterweight mounting portion 262 are made of the same material (e.g., plastic) and a different material from the main body 254 (e.g., metal). The external counterweight receiving portion 272 also has a corresponding dovetail flange 274 surrounding the perimeter of the cavity, and when the external counterweight receiving portion 272 slides into engagement with it, this dovetail flange engages with the corresponding dovetail flange 264 of the external counterweight mounting portion 262 of another external counterweight 110b to 110d or the dovetail flange 192 of the external counterweight mounting portion 152 of the handle assembly 104. The shape of the cavity of the external counterweight receiving portion 272 corresponds to the shape of the external counterweight mounting portions 152 and 262, and has a similar V-shape, wherein the width towards the bottom of the body 254 is shorter and the width towards the top of the body 254 is longer. A transverse groove 276 is also defined within the external counterweight receiving portion 272.

[0050] To prevent the outer counterweight 110a from disengaging from the other outer counterweight 110b or the outer counterweight mounting portion 152 of the handle assembly 104, a locking mechanism 256 is used to limit potential radial sliding movement between them. The locking mechanism 256 includes housings 278a and 278b connected to the body 254 via fasteners 280 and connecting sleeves 282. Housings 278a and 278b support a lever arm 284 and a locking pin 286. The lever arm 284 is pivotally mounted within the housing 278 via a pivot pin 288. The upper arm portion 290 of the lever arm 284 extends from the housing 278 and includes a knob 292 accessible from the outside of the body 254. The lower arm portion 294 of the lever arm 284 includes a head 296 that engages with a recess 298 in the sidewall of the locking pin 286. A biasing spring 300 (e.g., a torsion spring) provides biasing force to the lever arm 284 and causes the lever arm to move toward one or both of the locked and unlocked positions.

[0051] Locking pin 286 is oriented laterally to longitudinal axis 132 (e.g.) Figure 2 (as shown), and configured to slide into and out of the transverse groove 276 of the outer counterweight receiving portion 272 via the operation of lever arm 284. When the locking pin 286 is disposed within the transverse groove 276 of the outer counterweight receiving portion 272, the locking mechanism 256 is in the locked position. At least a portion of the locking pin 286 extends axially from the transverse groove 276 and is received within a corresponding transverse groove 266 of another outer counterweight 110b or a corresponding transverse groove 194 of the handle assembly 104 to restrict the removal of the outer counterweight 110a therefrom. The distal end 302 of the locking pin 286 may define a tapered nose to facilitate sliding the locking pin 286 into the transverse grooves 194, 266 and placing the locking mechanism 256 in the locked position. The body 254 of the outer counterweight 110a has a thickness 303 that is less than the thickness 246 of the inner counterweights 106, 108 (as shown). Figure 6 (As shown). The main body 200 has internal counterweights of 106 and 108 (e.g.). Figure 6 (As shown) It also has a different shape from the main body 254 of the external counterweight 110a, making them non-interchangeable.

[0052] The configuration of the external counterweights 110a to 110h and the locking mechanism 256 is further described in U.S. Patent Nos. 7,588,520, 8,075,458, 10,583,318 and 10,843,028, the entire contents of which are incorporated herein by reference.

[0053] Figure 10 Depicting ( Figure 1 Isometric view of the bracket 102 of the adjustable weight dumbbell 100 shown. Figure 11 A partially exploded isometric view of bracket 102 is depicted. Also refer to... Figure 10 and Figure 11The bracket 102 is configured to support the adjustable weight dumbbell 100 for storage when not in use. Additionally, the bracket 102 supports the adjustable weight dumbbell 100, allowing the inner weights 106, 108 and the outer weight 110 to be easily attached to and detached from the handle assembly 104 (as shown in the image). Figure 1 (as shown) and as described herein. Therefore, when the adjustable weight dumbbell 100 is in use and removed from the bracket 102, the bracket 102 is configured to support the unused inner weights 106, 108 and outer weight 110, and to place them in an efficient position that facilitates reattachment as needed or desired.

[0054] Bracket 102 along longitudinal axis 132 (e.g.) Figure 2 (As shown) Extends and terminates at the first end plate 120 and the second end plate 122. Two elongated support members 304, 306 extend between the first end plate 120 and the second end plate 122 and are configured to receive and support the adjustable weight dumbbell 100 at the top. In other examples, the pair of elongated support members 304, 306 may be a single elongated support member that facilitates support of the adjustable weight dumbbell 100 and as described herein. Two intermediate members 308, 310 extend between the support members 304, 306 and are disposed between the first end plate 120 and the second end plate 122. The top surfaces of the intermediate members 308, 310 each define a recessed ledge 311, which is configured to receive and support the first plate 134 and the second plate 140 of the handle assembly 104 (as shown). Figure 1 (As shown). The platform 311 restricts the adjustable weight dumbbell 100 from sliding along the support members 304 and 306.

[0055] End plates 120, 122 further define a cavity 124 for receiving and storing the inner counterweights 106, 108 when not in use. The cavity 124 may also be defined by an internal protrusion 312, the shape and size of which correspond to the notch 204 of the inner counterweights 106, 108 (e.g., ...). Figure 4 and Figure 5 (As shown). The inner side of each of the end plates 120, 122 defines a V-shaped receiving portion 314 with a dovetail flange 316. The receiving portion 314 is configured to receive the external counterweight mounting portion 262 of the external counterweight 110a / h (as shown). Figure 7The bottom portion (shown) allows the outer counterweight 110a / h to be supported on the bracket 102. The outer counterweight 110a / h is not locked to the receiving part 314 by a locking mechanism; instead, the outer counterweight mounting part 262 can be slidably engaged and disengaged in the vertical direction as needed or desired. The receiving part 314 is configured to support the outer counterweight 110a / h in an upright position such that when one or more of the outer counterweights 110a to 110h are not in use, the outer counterweights remain facing upwards for easy reception of the outer counterweights 110a to 110h in use and for attachment / removal as needed or desired.

[0056] In the example implementation, the width of the bracket 102 between the end plates 120, 122 facilitates support for five external weights 110 on the left and right sides of the intermediate members 308, 310. Some users may not need or expect all external weight options. Therefore, one or more spacers 118 are included, which are coupled to the first end plate 120 and the second end plate 122, such that the adjustable weight dumbbell 100 is supported on the bracket 102 with fewer than five left and right external weights 110. The spacer 118 includes a spacer mounting portion 318, which is a V-shaped axial projection with a dovetail flange 320 that can be coupled to a corresponding receiving portion 314 on the end plates 120, 122. On the opposite side of the spacer mounting portion 318, the spacer 118 defines a spacer receiving portion 322, which is a V-shaped cavity with a peripheral lip defining an edge recess 324 configured to receive the bottom portion of the outer weight mounting portion 262 of the outer weight 110. Depending on the number of outer weights 110 included in the adjustable weight dumbbell 100, multiple spacers 118 can be used at each end of the bracket 102 to support the adjustable weight dumbbell 100. The spacers 118 can also engage with each other via the mounting portion 318 and the receiving portion 322. Therefore, the spacers 118 allow the adjustable weight dumbbell 100 to be supported on the bracket 102 even if the outer weights 110 cannot reach the end plates 120, 122. As the adjustable weight dumbbell 100 expands to include additional outer weights 110, the spacers 118 can be removed. The spacers 118 have a thickness 303 (e.g., the thickness of the outer weights 110) with respect to the outer weights 110. Figure 9 The matching thickness 326 (as shown) ensures that the adjustable weight dumbbell 100 remains positioned on the bracket 102 regardless of the number of external weights 110 used.

[0057] The intermediate members 308, 310 may also include weight markings 114, 116 corresponding to the individual weight of the handle assembly 104 and the weight when used in conjunction with the inner counterweights 106, 108. Opposite ends 328, 330 of the spacer 118 are configured to be mounted on a cover 112 disposed between the end plates 120, 122 and the intermediate members 308, 310. Opposite ends 328, 330 may define recesses that are flexibly and elastically fitted onto the cover 112, for example, using the spacer 118 in the form of molded plastic. This allows the spacer 118 to cover the weight markings 114, 116 corresponding to the replaced outer counterweights 110.

[0058] Bracket 102 is symmetrical about the midplane and relative to the longitudinal axis 132. Therefore, bracket 102 can support the adjustable weight dumbbell 100 in two different longitudinal directions. Additional views of bracket 102 are shown in the applications filed September 14, 2024, entitled “Crade for Adjustable Weight Dumbbell” and “Spacer for Adjustable Weight Dumbbell Crade” (Attorney’s File Nos. 2355.10084.00US-D and 2355.10089.00US-D), the entire contents of which are incorporated herein by reference.

[0059] Figure 12 An isometric view of a partial cross-section of an adjustable weight dumbbell 100 is depicted. Some parts have been described above, and not necessarily... Figure 12 Further description. For example... Figure 12 As shown, the first plate 134 of the handle assembly 104 is connected to a first inner counterweight 106 and an outer counterweight 110. An inner counterweight mounting bracket 150 extends from the inner side 142 of the first plate 134 and is positioned directly above the handle 126. The outer periphery of the inner counterweight mounting portion 150 has a dovetail flange 162 that receives a corresponding dovetail flange 216 formed in the mounting portion receiving portion 214 within the body 200 of the inner counterweight 106. This engagement between the inner counterweight 106 and the handle assembly 104 prevents the inner counterweight 106 from sliding axially away from the inner side 142. To prevent the inner counterweight 106 from being removed from the inner counterweight mounting portion 150, the locking mechanism 202 moves toward a locked position, causing the locking pin 224 to move laterally into the transverse grooves 164, 218 formed within the inner counterweight mounting portion 150 and the mounting portion receiving portion 214.

[0060] The inclined surface 252 of the inner counterweight 106 tapers towards the outer counterweight 110. As described above, the inner counterweight 106 is inserted into the handle assembly 104 in a downward vertical direction. Therefore, the bottom of the body 200 of the inner counterweight 106 is positioned directly above and spaced apart from the support column 170. Conversely, due to the configuration of the mounting portion, the bottom of the handle assembly 104 is arranged vertically downward on the outer counterweight 110.

[0061] The outer counterweight mounting portion 152 extends outward from the outer side 144 of the first plate 134. The dovetail flange 192 of the outer counterweight mounting portion 152 engages with the corresponding dovetail flange 274 of the outer counterweight receiving portion 272 to prevent the outer counterweight 110 from sliding axially away from the outer side 144. To prevent the outer counterweight 110 from being removed from the outer counterweight mounting portion 152, a locking mechanism 256 (such as...) is used. Figure 9 As shown) moves toward the locking position, causing the locking pin 286 (as shown) to move toward the locking position. Figure 9 (As shown) Move laterally into the lateral grooves 194, 276 formed in the external counterweight mounting part 152 and the external counterweight receiving part 272. Then, using the first side 258 of the external counterweight 110, another external counterweight can be removably attached to the handle assembly 104 as needed or desired.

[0062] In one example form disclosed herein, the adjustable weight dumbbell includes a handle assembly, a first inner weight, and a second inner weight. The handle assembly further includes: a handle having a first end and an opposing second end; a first plate mounted to the first end of the handle; and a second plate mounted to the second end of the handle. The first plate may have a first inner side adjacent to the handle; a first outer side; and a first inner weight mounting structure positioned on the first inner side. The second plate may have a second inner side adjacent to the handle and facing the first inner side; a second outer side; and a second inner weight mounting structure positioned on the second inner side. The first inner weight may be configured to be removably coupled to the first inner weight mounting structure. The second inner weight is configured to be removably coupled to the second inner weight mounting structure.

[0063] In another example, the adjustable weight dumbbell may further include: a first external weight mounting structure positioned on a first outer side of a first plate; a second external weight mounting structure positioned on a second outer side of a second plate; one or more first external weights, each configured to be removably attached to the first external weight mounting structure; and one or more second external weights, each configured to be removably attached to the second external weight mounting structure.

[0064] In another example of an adjustable weight dumbbell, each of the first external weights can be configured to be removably attached to another adjacent first external weight.

[0065] In another example of an adjustable weight dumbbell, each of the second outer weights can be configured to be removably attached to another adjacent second outer weight.

[0066] In another example of an adjustable weight dumbbell, the first weight of either the first inner weight or the second inner weight may be different from the second weight of either the first outer weight or the second outer weight.

[0067] In another example of an adjustable weight dumbbell, the first weight can be less than the second weight.

[0068] In another example of an adjustable weight dumbbell, the first and second inner weight mounting structures may each include a bracket that is respectively mounted to and extends from the first or second plate. The bracket may define a dovetail flange around at least a portion of its perimeter. The first and second inner weights may each have a body that defines a notch corresponding in shape to the bracket. The edge of the notch defining the body may define a corresponding dovetail flange associated with the dovetail flange of the bracket for engagement with the bracket.

[0069] In another example of an adjustable weight dumbbell, the first inner weight mounting structure and the second inner weight mounting structure may each include a first support. The first support may have a top end with a first width and a bottom end with a second width longer than the first width. The first outer weight mounting structure and the second outer weight mounting structure may each include a second support. The second support may have a top end with a third length and a bottom end with a fourth length shorter than the third length. The first tapering direction of the first inner weight mounting structure and the second inner weight mounting structure from the top end of the first support to the bottom end may be opposite to the second tapering direction of the first outer weight mounting structure and the second outer weight mounting structure from the top end of the second support to the bottom end.

[0070] In another example of an adjustable weight dumbbell, the first and second inner weight mounting structures may each include a locking structure configured to selectively engage and disengage with the first and second inner weight mounting structures, respectively.

[0071] In another example of an adjustable weight dumbbell, a first region on the first outer side of the first plate adjacent to the first external counterweight mounting structure may include a first surface texture having a first coefficient of friction. A second region on the first outer side of the first plate, spaced apart from the first external counterweight mounting structure, may include a second surface texture having a second coefficient of friction. The first coefficient of friction may be lower than the second coefficient of friction.

[0072] In another example of an adjustable weight dumbbell, the first inner weight and the second inner weight may each have a body defining a notch that is shaped and sized to at least partially receive a handle when respectively attached to the first inner weight mounting structure and the second inner weight mounting structure.

[0073] In another example of an adjustable weight dumbbell, the center of mass of each of the first and second inner weights can be set within a notch.

[0074] In another example of an adjustable weight dumbbell, when the first inner weight and the second inner weight are respectively attached to the first inner weight mounting structure and the second inner weight mounting structure, the center of mass of each of the first inner weight and the second inner weight can be aligned with the longitudinal axis of the handle.

[0075] In another example of an adjustable weight dumbbell, the first inner weight and the second inner weight may each have a body that defines a ramp at the top of the first inner weight and the top of the second inner weight, respectively.

[0076] In another example form disclosed herein, the adjustable weight dumbbell may include a handle assembly, a first inner weight, a second inner weight, and a plurality of inner weights. The handle assembly may further include a handle having a first end and an opposing second end, a first plate attached to the first end of the handle, and a second plate attached to the second end of the handle. The first plate may have a first inner side and a first outer side; a first inner weight support disposed on the first inner side; and a first outer weight support disposed on the first outer side. The second plate may have a second inner side facing the first inner side of the first plate and a second outer side; a second inner weight support disposed on the second inner side; and a second outer weight support disposed on the second outer side. The first inner weight may be configured to be removably coupled to the first inner weight support. The second inner weight may be configured to be removably coupled to the second inner weight support. The first and second inner weights may, when coupled to the handle assembly, at least partially surround the handle. The plurality of outer weights may be configured to be removably coupled to the first and second outer weight supports and removably coupled to each other to adjust the weight of the adjustable weight dumbbell.

[0077] In another example of an adjustable weight dumbbell, the first inner side and the second inner side may be formed of a different material than the first outer side and the second outer side.

[0078] In another example of an adjustable weight dumbbell, a first inner weight and a second inner weight can be slidably engaged with a first inner weight support and a second inner weight support along a first direction, and a plurality of outer weights can be slidably engaged with a first outer weight support and a second outer weight support along a second direction.

[0079] In another example of an adjustable weight dumbbell, each of the first inner weight and the second inner weight may have a center of gravity located outside the body of the first inner weight and the second inner weight.

[0080] In another example of an adjustable weight dumbbell, the first inner weight can be a mirror image of the second inner weight.

[0081] In another example of an adjustable weight dumbbell, each of the first and second inner weights has a locking mechanism configured to engage and disengage from the first and second inner weight supports, respectively.

[0082] All directional references (e.g., proximal, distal, up, down, upward, downward, left, right, lateral, longitudinal, front, back, top, bottom, above, below, vertical, horizontal, radial, axial, clockwise, and counterclockwise) are for identification purposes only to aid the reader in understanding the structures disclosed herein and do not constitute limitation, particularly regarding the location, orientation, or use of such structures. Connections (e.g., attachment, joint, connection, and engagement) should be interpreted broadly and, unless otherwise stated, may include intermediate members between sets of elements and relative movement between elements. Therefore, connection references do not necessarily imply that two elements are directly connected and fixedly associated with each other. Exemplary figures are for illustrative purposes only, and the dimensions, positions, order, and relative sizes shown in the accompanying figures may vary.

[0083] It should be understood that this disclosure is not limited to the specific structures, processes, or materials disclosed herein, but extends to their equivalents that would be recognized by one of ordinary skill in the art. It should also be understood that the terminology used herein is for the purpose of describing particular examples only and is not intended to be limiting. It must be noted that, when used in this specification, the singular forms “a,” “an,” and “the” include plural references unless the context clearly specifies otherwise. Furthermore, those skilled in the art will understand the extent conveyed by terms such as “about,” “approximately,” or “substantially” under the measurement techniques employed herein. For such terms that may not be explicitly defined or understood by one of ordinary skill in the art, the term “about” should mean plus or minus ten percent.

[0084] As used herein (including in the claims), when the term “and / or” is used in a list of two or more items, it means that any one of the listed items may be employed by itself, or any combination of two or more of the listed items may be employed. For example, if a composition is described as containing components A, B, and / or C, the composition may contain a single A; a single B; a single C; a combination of A and B; a combination of A and C; a combination of B and C; or a combination of A, B, and C. Furthermore, as used herein (including in the claims), “or” as used in a list of items (e.g., a list of items ending with a phrase such as “at least one of” or “one or more of”) indicates a separate list, such that a list such as “at least one of A, B, or C” means A or B or C or AB or AC or BC or ABC, or A and B and C.

[0085] It should be understood that the systems and methods described herein are suited to achieve the stated purposes and advantages, as well as those inherent therein. When used in this description, the terms “example” and “exemplary” mean “serving as an example, instance, or illustration” and not “preferred” or “advantageous compared to other examples.” Those skilled in the art will recognize that the methods and systems in this specification can be implemented in various ways and should therefore not be limited to the foregoing examples. In this regard, any number of features of the different examples described herein can be combined into a single example, and alternative examples with fewer or more features than all those described herein are possible.

[0086] While various examples have been described for the purposes of this disclosure, various changes and modifications can be made, which are entirely within the scope of this disclosure. Many other changes will readily occur to those skilled in the art, all of which are contained within the spirit of this disclosure. Claims (as amended under Article 19 of the Treaty) 1. An adjustable weight dumbbell, comprising: Handle assembly, including: A handle having a first end and an opposite second end; A first plate, mounted to the first end of the handle, the first plate having: a first inner side adjacent to the handle; a first outer side; and a first inner counterweight mounting structure positioned on the first inner side; and A second plate, mounted to the second end of the handle, the second plate having: a second inner side adjacent to the handle and facing the first inner side; a second outer side; and a second inner counterweight mounting structure positioned on the second inner side; and A first internal counterweight, configured to be removably connected to a first internal counterweight mounting structure; and The second inner counterweight is configured to be removably connected to the second inner counterweight mounting structure. 2. The adjustable weight dumbbell according to claim 1 further includes: The first external counterweight mounting structure is positioned on the first outer side of the first plate; The second external counterweight mounting structure is positioned on the second outer side of the second plate; One or more first external counterweights, each first external counterweight configured to be removably connected to a first external counterweight mounting structure; and One or more second external counterweights, each second external counterweight configured to be removably connected to the second external counterweight mounting structure. 3. The adjustable weight dumbbell of claim 2, wherein each of the first external weights is configured to be removably attached to another adjacent first external weight. 4. The adjustable weight dumbbell of claim 2, wherein each of the second external weights is configured to be removably attached to another adjacent second external weight. 5. The adjustable weight dumbbell of claim 2, wherein the first weight of either the first inner weight or the second inner weight is different from the second weight of either the one or more first outer weights or the one or more second outer weights. 6. The adjustable weight dumbbell according to claim 5, wherein the first weight is less than the second weight. 7. The adjustable weight dumbbell according to claim 1, wherein, The first internal counterweight mounting structure and the second internal counterweight mounting structure each include a bracket, the bracket being respectively mounted to the first plate or the second plate and extending from the first plate or the second plate accordingly; The bracket defines a dovetail flange around at least a portion of the bracket's perimeter; The first inner counterweight and the second inner counterweight each have a main body, and the main body defines a notch whose shape corresponds to that of the bracket; The edge of the recess defined by the main body defines a corresponding dovetail flange associated with the dovetail flange of the bracket for engagement with the bracket. 8. The adjustable weight dumbbell according to claim 2, wherein, The first internal counterweight mounting structure and the second internal counterweight mounting structure each include a first bracket; The first bracket has a top end with a first width and a bottom end with a second width, the second width being longer than the first width; The first external counterweight mounting structure and the second external counterweight mounting structure each include a second bracket; The second bracket has a top end with a third width and a bottom end with a fourth width, the fourth width being shorter than the third width; and The first tapering direction of the first inner counterweight mounting structure and the second inner counterweight mounting structure from the top to the bottom of the first bracket is opposite to the second tapering direction of the first outer counterweight mounting structure and the second outer counterweight mounting structure from the top to the bottom of the second bracket. 9. The adjustable weight dumbbell according to claim 1, wherein the first inner weight mounting structure and the second inner weight mounting structure each include a locking structure configured to selectively engage and disengage with the first inner weight mounting structure and the second inner weight mounting structure, respectively. 10. The adjustable weight dumbbell according to claim 2, wherein, The first region on the first outer side of the first plate, adjacent to the first external counterweight mounting structure, includes a first surface texture having a first coefficient of friction. The second region on the first outer side of the first plate, spaced apart from the first external counterweight mounting structure, includes a second surface texture having a second coefficient of friction. The first coefficient of friction is lower than the second coefficient of friction. 11. The adjustable weight dumbbell of claim 1, wherein the first inner weight and the second inner weight each have a body defining a notch, the notch being shaped and sized to at least partially receive the handle when respectively coupled to the first inner weight mounting structure and the second inner weight mounting structure. 12. The adjustable weight dumbbell of claim 11, wherein the center of mass of each of the first inner weight and the second inner weight is disposed within the notch. 13. The adjustable weight dumbbell of claim 12, wherein when the first inner weight and the second inner weight are respectively connected to the first inner weight mounting structure and the second inner weight mounting structure, the center of mass of each of the first inner weight and the second inner weight is aligned with the longitudinal axis of the handle. 14. The adjustable weight dumbbell according to claim 1, wherein the first inner weight and the second inner weight each have a main body, the main body defining an inclined surface at the top of the first inner weight and the top of the second inner weight, respectively. 15. An adjustable weight dumbbell, comprising: Handle assembly, including: A handle having a first end and an opposite second end; A first plate, mounted to the first end of the handle, the first plate having: a first inner side and a first outer side; a first inner counterweight bracket disposed on the first inner side; and a first outer counterweight bracket disposed on the first outer side; and A second plate is mounted to the second end of the handle. The second plate has: a second inner side and a second outer side, the second inner side facing the first inner side of the first plate; a second inner counterweight bracket disposed on the second inner side; and a second outer counterweight bracket disposed on the second outer side. The first inner counterweight is configured to be removably connected to the first inner counterweight bracket; A second inner weight is configured to be removably attached to a second inner weight bracket, wherein the first and second inner weights, when attached to the handle assembly, at least partially surround the handle; and Multiple external weights are configured to be removably connected to the first external weight bracket and the second external weight bracket and to be removably connected to each other, so as to adjust the weight of the adjustable weight dumbbell. 16. The adjustable weight dumbbell of claim 15, wherein the first inner side and the second inner side are formed of a material different from the first outer side and the second outer side. 17. The adjustable weight dumbbell of claim 15, wherein the first inner weight and the second inner weight are slidably engaged with the first inner weight support and the second inner weight support along a first direction, and the plurality of outer weights are slidably engaged with the first outer weight support and the second outer weight support along a second direction. 18. The adjustable weight dumbbell of claim 15, wherein each of the first inner weight and the second inner weight has a center of gravity disposed outside the body of the first inner weight and the second inner weight. 19. The adjustable weight dumbbell according to claim 15, wherein the first inner weight is a mirror image of the second inner weight. 20. The adjustable weight dumbbell of claim 15, wherein each of the first inner weight and the second inner weight has a locking mechanism configured to engage and disengage from the first inner weight support and the second inner weight support, respectively.

Claims

1. An adjustable weight dumbbell, comprising: Handle assembly, including: A handle having a first end and an opposite second end; A first plate, mounted to the first end of the handle, the first plate having: a first inner side adjacent to the handle; a first outer side; and a first inner counterweight mounting structure positioned on the first inner side; and A second plate, mounted to the second end of the handle, the second plate having: a second inner side adjacent to the handle and facing the first inner side; a second outer side; and a second inner counterweight mounting structure positioned on the second inner side; and A first internal counterweight, configured to be removably connected to a first internal counterweight mounting structure; and The second inner counterweight is configured to be removably connected to the second inner counterweight mounting structure.

2. The adjustable weight dumbbell according to claim 1 further includes: The first external counterweight mounting structure is positioned on the first outer side of the first plate; The second external counterweight mounting structure is positioned on the second outer side of the second plate; One or more first external counterweights, each first external counterweight configured to be removably connected to a first external counterweight mounting structure; and One or more second external counterweights, each second external counterweight configured to be removably connected to the second external counterweight mounting structure.

3. The adjustable weight dumbbell according to claim 2, wherein, Each of the first external weights is configured to be removably attached to another adjacent first external weight.

4. The adjustable weight dumbbell according to claim 2, wherein, Each of the second outer weights is configured to be removably attached to another adjacent second outer weight.

5. The adjustable weight dumbbell according to claim 2, wherein, The first weight of either the first inner weight or the second inner weight is different from the second weight of either the one or more first outer weights or the one or more second outer weights.

6. The adjustable weight dumbbell according to claim 1, wherein, The first weight is less than the second weight.

7. The adjustable weight dumbbell according to claim 1, wherein, The first internal counterweight mounting structure and the second internal counterweight mounting structure each include a bracket, the bracket being respectively mounted to the first plate or the second plate and extending from the first plate or the second plate accordingly; The bracket defines a dovetail flange around at least a portion of the bracket's perimeter; The first inner counterweight and the second inner counterweight each have a main body, and the main body defines a notch whose shape corresponds to that of the bracket; The edge of the recess defined by the main body defines a corresponding dovetail flange associated with the dovetail flange of the bracket for engagement with the bracket.

8. The adjustable weight dumbbell according to claim 2, wherein, The first internal counterweight mounting structure and the second internal counterweight mounting structure each include a first bracket; The first bracket has a top end with a first width and a bottom end with a second width, the second width being longer than the first width; The first external counterweight mounting structure and the second external counterweight mounting structure each include a second bracket; The second bracket has a top end of a third length and a bottom end of a fourth length, the fourth length being shorter than the third length; and The first tapering direction of the first inner counterweight mounting structure and the second inner counterweight mounting structure from the top to the bottom of the first bracket is opposite to the second tapering direction of the first outer counterweight mounting structure and the second outer counterweight mounting structure from the top to the bottom of the second bracket.

9. The adjustable weight dumbbell according to claim 1, wherein, The first inner counterweight mounting structure and the second inner counterweight mounting structure each include a locking structure, the locking structure being configured to selectively engage and disengage with the first inner counterweight mounting structure and the second inner counterweight mounting structure, respectively.

10. The adjustable weight dumbbell according to claim 2, wherein, The first region on the first outer side of the first plate, adjacent to the first external counterweight mounting structure, includes a first surface texture having a first coefficient of friction. The second region on the first outer side of the first plate, spaced apart from the first external counterweight mounting structure, includes a second surface texture having a second coefficient of friction. The first coefficient of friction is lower than the second coefficient of friction.

11. The adjustable weight dumbbell according to claim 1, wherein, The first inner counterweight and the second inner counterweight each have a body defining a notch, the shape and size of which are designed to at least partially receive the handle when respectively connected to the first inner counterweight mounting structure and the second inner counterweight mounting structure.

12. The adjustable weight dumbbell according to claim 11, wherein, The center of mass of each of the first inner weight and the second inner weight is located within the notch.

13. The adjustable weight dumbbell according to claim 12, wherein, When the first inner counterweight and the second inner counterweight are respectively connected to the first inner counterweight mounting structure and the second inner counterweight mounting structure, the center of mass of each of the first inner counterweight and the second inner counterweight is aligned with the longitudinal axis of the handle.

14. The adjustable weight dumbbell according to claim 1, wherein, The first inner counterweight and the second inner counterweight each have a main body, and the main body defines an inclined surface at the top of the first inner counterweight and the top of the second inner counterweight, respectively.

15. An adjustable weight dumbbell, comprising: Handle assembly, including: A handle having a first end and an opposite second end; A first plate, mounted to the first end of the handle, the first plate having: a first inner side and a first outer side; a first inner counterweight bracket disposed on the first inner side; and a first outer counterweight bracket disposed on the first outer side; and A second plate is mounted to the second end of the handle. The second plate has: a second inner side and a second outer side, the second inner side facing the first inner side of the first plate; a second inner counterweight bracket disposed on the second inner side; and a second outer counterweight bracket disposed on the second outer side. The first inner counterweight is configured to be removably connected to the first inner counterweight bracket; A second inner weight is configured to be removably attached to a second inner weight bracket, wherein the first and second inner weights, when attached to the handle assembly, at least partially surround the handle; and Multiple external weights are configured to be removably connected to the first external weight bracket and the second external weight bracket and to be removably connected to each other, so as to adjust the weight of the adjustable weight dumbbell.

16. The adjustable weight dumbbell according to claim 15, wherein, The first inner side and the second inner side are formed of a different material than the first outer side and the second outer side.

17. The adjustable weight dumbbell according to claim 15, wherein, The first inner counterweight and the second inner counterweight are slidably engaged with the first inner counterweight bracket and the second inner counterweight bracket along a first direction, and the plurality of outer counterweights are slidably engaged with the first outer counterweight bracket and the second outer counterweight bracket along a second direction.

18. The adjustable weight dumbbell according to claim 15, wherein, Each of the first inner weight and the second inner weight has a center of gravity located outside the body of the first inner weight and the second inner weight.

19. The adjustable weight dumbbell according to claim 15, wherein, The first inner weight is a mirror image of the second inner weight.

20. The adjustable weight dumbbell according to claim 15, wherein, Each of the first inner counterweight and the second inner counterweight has a locking mechanism configured to engage and disengage from the first inner counterweight support and the second inner counterweight support, respectively.

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