# US 12,594,453 B2 · Weight-adjustable dumbbell > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,594,453 B2 - Document ID: US12594453B2 - Status: Granted - Kind: B2 - Application number: 18/633,169 - Filed: 2024-04-11 - Published: 2025-01-09 - Granted: 2026-04-07 - Earliest claimed: 2023-07-08 - Assignees: Duoming Zhong - Applicants: Duoming Zhong - Inventors: Chun Jiang - Web page: https://patentgrep.com/patent/US12594453B2 ## CPC - A63B 21/075: with variable weights {, e.g. weight systems with weight selecting means for bar-bells or dumb-bells} - A63B 21/0726: {Dumb bells, i.e. with a central bar to be held by a single hand, and with weights at the ends} - A63B 21/0728: {with means for fixing weights on bars, i.e. fixing olympic discs or bumper plates on bar-bells or dumb-bells} - A63B: APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT (apparatus for passive exercising, massage A61H) ## Abstract A weight-adjustable dumbbell includes a handle and counterweight block groups. The counterweight block groups include main counterweight blocks and auxiliary counterweight blocks. The main counterweight blocks are fixedly connected to two ends of the handle. One side of each auxiliary counterweight block is provided with a boss. Two ends of the boss are provided with fan-shaped convex blocks arranged correspondingly. One side of each auxiliary counterweight block away from the boss and one side of each main counterweight block away from the handle are both provided with grooves that are matched with the boss. Two sides of the grooves are provided with fan-shaped slots that are matched with the fan-shaped convex blocks. Mounting clamping slots that are matched with the fan-shaped convex blocks are arranged between inner sides of the grooves and the fan-shaped slots on the two sides. ## Claims ### Claim 1 A weight-adjustable dumbbell, comprising: a handle; and counterweight block groups, wherein the counterweight block groups comprise main counterweight blocks and auxiliary counterweight blocks; the main counterweight blocks are connected to two ends of the handle; one side of each auxiliary counterweight block is provided with a first connecting part; the main counterweight blocks are provided with first connecting fitting parts; and the first connecting parts are detachably connected to the first connecting fitting parts; wherein each of the main counterweight blocks and the auxiliary counterweight blocks comprises a counterweight block shell, a fixed cover plate, and a counterweight iron plate; the counterweight block shell and the fixed cover plate are fitted together to form a counterweight block cavity, the counterweight iron plate is enclosed in the counterweight block cavity; wherein each first connecting part is a first buckle part; each first connecting fitting part is a first buckle fitting part; and the first buckle part is detachably connected to the first buckle fitting part; wherein the first buckle part is a first spinning buckle; the first buckle fitting part is a first spinning slot; the first spinning buckle is provided with a first stop convex block; the first spinning slot is provided with a first stop edge; the first stop edge is provided with a first notch; the first notch is communicated to the first spinning slot; when the first stop convex block rotates with the first spinning buckle to the first notch, the first stop convex block is able to be inserted into the first spinning slot via the first notch along with the first spinning buckle; and when the first stop convex block is inserted into the first spinning slot via the first notch along with the first spinning buckle, the first spinning buckle is rotated to enable the first stop convex block to rotate to be staggered from the first notch, causing the first stop edge to stop the first stop convex block of the first spinning buckle in the first spinning slot, so that the main counterweight block and the auxiliary counterweight block are combined to form a whole. ### Claim 2 (depends on 1) The weight-adjustable dumbbell according to claim 1, further comprising a first locking device, wherein when the first spinning buckle is rotated to enable the first stop convex block to rotate to be staggered from the first notch, causing the first stop edge to stop the first stop convex block of the first spinning buckle in the first spinning slot, the first locking device locks the main counterweight block to the auxiliary counterweight block. ### Claim 3 (depends on 2) The weight-adjustable dumbbell according to claim 2, wherein the first locking device comprises a first elastic locking buckle arranged on the main counterweight block and a first locking slot arranged on the auxiliary counterweight block; and when the first spinning buckle is rotated to enable the first stop convex block to rotate to be staggered from the first notch, causing the first stop edge to stop the first stop convex block of the first spinning buckle in the first spinning slot, the first elastic locking buckle is pressed and locked in the first locking slot, causing the first locking device to lock the main counterweight block to the auxiliary counterweight block. ### Claim 4 (depends on 3) The weight-adjustable dumbbell according to claim 3, wherein the other side of the auxiliary counterweight block is provided with a second connecting fitting part; the weight-adjustable dumbbell further comprises a second auxiliary counterweight block; one side of the second auxiliary counterweight block is provided with a second connecting part; and the second connecting fitting part is detachably connected to the second connecting part. ### Claim 5 (depends on 4) The weight-adjustable dumbbell according to claim 4, wherein the second connecting part is a second buckle part; the second connecting fitting part is a second buckle fitting part; and the second buckle part is detachably connected to the second buckle fitting part. ### Claim 6 (depends on 5) The weight-adjustable dumbbell according to claim 5, wherein the second buckle part is a second spinning buckle; the second buckle fitting part is a second spinning slot; the second spinning buckle is provided with a second stop convex block; the second spinning slot is provided with a second stop edge; the second stop edge is provided with a second notch; the second notch is communicated to the second spinning slot; when the second stop convex block rotates with the second spinning buckle to the second notch, the second stop convex block is able to be inserted into the second spinning slot via the second notch along with the second spinning buckle; and when the second stop convex block is inserted into the second spinning slot via the second notch along with the second spinning buckle, the second spinning buckle is rotated to enable the second stop convex block to rotate to be staggered from the second notch, causing the second stop edge to stop the second stop convex block of the second spinning buckle in the second spinning slot, so that the second auxiliary counterweight block and the auxiliary counterweight block are combined to form a whole. ### Claim 7 (depends on 6) The weight-adjustable dumbbell according to claim 6, further comprising a second locking device, wherein when the second spinning buckle is rotated to enable the second stop convex block to rotate to be staggered from the second notch, causing the second stop edge to stop the second stop convex block of the second spinning buckle in the second spinning slot, the second locking device locks the second auxiliary counterweight block to the auxiliary counterweight block. ### Claim 8 (depends on 7) The weight-adjustable dumbbell according to claim 7, wherein the second locking device comprises a second elastic locking buckle arranged on the auxiliary counterweight block and a second locking slot arranged on the second auxiliary counterweight block; and when the second spinning buckle is rotated to enable the second stop convex block to rotate to be staggered from the second notch, causing the second stop edge to stop the second stop convex block of the second spinning buckle in the second spinning slot, the second elastic locking buckle is pressed and locked in the second locking slot, causing the second locking device to lock the second auxiliary counterweight block to the auxiliary counterweight block. ### Claim 9 (depends on 8) The weight-adjustable dumbbell according to claim 8, wherein the other side of the second auxiliary counterweight block is provided with a third connecting fitting part; the weight-adjustable dumbbell further comprises a third auxiliary counterweight block; one side of the third auxiliary counterweight block is provided with a third connecting part; and the third connecting part is detachably connected to the third connecting fitting part. ### Claim 10 (depends on 9) The weight-adjustable dumbbell according to claim 9, wherein the third connecting part is a third buckle part; the third connecting fitting part is a third buckle fitting part; and the third buckle part is detachably connected to the third buckle fitting part. ### Claim 11 (depends on 10) The weight-adjustable dumbbell according to claim 10, wherein the third buckle part is a third spinning buckle; the third buckle fitting part is a third spinning slot; the third spinning buckle is provided with a third stop convex block; the third spinning slot is provided with a third stop edge; the third stop edge is provided with a third notch; the third notch is communicated to the third spinning slot; when the third stop convex block rotates with the third spinning buckle to the third notch, the third stop convex block is able to be inserted into the third spinning slot via the second notch along with the third spinning buckle; and when the third stop convex block is inserted into the third spinning slot via the third notch along with the third spinning buckle, the third spinning buckle is rotated to enable the third stop convex block to rotate to be staggered from the third notch, causing the third stop edge to stop the third stop convex block of the third spinning buckle in the third spinning slot, so that the third auxiliary counterweight block and the second auxiliary counterweight block are combined to form a whole. ### Claim 12 (depends on 11) The weight-adjustable dumbbell according to claim 11, further comprising a third locking device, wherein when the third spinning buckle is rotated to enable the third stop convex block to rotate to be staggered from the third notch, causing the third stop edge to stop the third stop convex block of the third spinning buckle in the third spinning slot, the third locking device locks the third auxiliary counterweight block to the second auxiliary counterweight block. ### Claim 13 (depends on 12) The weight-adjustable dumbbell according to claim 12, wherein the third locking device comprises a third elastic locking buckle arranged on the second auxiliary counterweight block and a third locking slot arranged on the third auxiliary counterweight block; and when the third spinning buckle is rotated to enable the third stop convex block to rotate to be staggered from the third notch, causing the third stop edge to stop the third stop convex block of the third spinning buckle in the third spinning slot, the third elastic locking buckle is pressed and locked in the third locking slot, causing the third locking device to lock the third auxiliary counterweight block to the second auxiliary counterweight block. ### Claim 14 (depends on 13) The weight-adjustable dumbbell according to claim 13, wherein the second auxiliary counterweight block and the third auxiliary counterweight block each also comprises a counterweight block shell, a fixed cover plate, and a counterweight iron plate; the counterweight block shell and the fixed cover plate are fitted together to form a counterweight block cavity, the counterweight iron plate is enclosed in the counterweight block cavity. ### Claim 15 (depends on 14) The weight-adjustable dumbbell according to claim 14, wherein an inner side wall of the counterweight block shell is provided with a fixed clamping block, and an outer wall of the fixed cover plate is provided with a fixed clamping slot that is matched with the fixed clamping block. ### Claim 16 (depends on 15) The weight-adjustable dumbbell according to claim 15, wherein an insertion slot is arranged on one side of the fixed cover plate of each of the main counterweight block, the auxiliary counterweight block, and the second auxiliary counterweight block; the first elastic locking buckle, the second elastic locking buckle, and the third elastic locking buckle each comprise a positioning ball and a positioning spring; the positioning ball is slidably inserted into the insertion slot; the positioning spring is arranged in the insertion slot; and the positioning spring is connected to the positioning ball to push and lock the positioning ball to the first locking slot, the second locking slot, or the third locking slot; the fixed cover plate of the third auxiliary counterweight block is provided with no insertion slot. ### Claim 17 A weight-adjustable dumbbell, comprising a handle and counterweight block groups, wherein the counterweight block groups comprise main counterweight blocks and auxiliary counterweight blocks; the main counterweight blocks are fixedly connected to two ends of the handle; one side of each auxiliary counterweight block is provided with a boss; two ends of the boss are provided with fan-shaped convex blocks arranged correspondingly; one side of each auxiliary counterweight block away from the boss and one side of each main counterweight block away from the handle are both provided with grooves that are matched with the boss; two sides of the grooves are provided with fan-shaped slots that are matched with the fan-shaped convex blocks; and mounting clamping slots that are matched with the fan-shaped convex blocks are arranged between inner sides of the grooves and the fan-shaped slots on the two sides; wherein each of the main counterweight blocks and the auxiliary counterweight blocks comprises a counterweight block shell, a fixed cover plate, and a counterweight iron plate; the counterweight block shell and the fixed cover plate are fitted together to form a counterweight block cavity, the counterweight iron plate is enclosed in the counterweight block cavity. ### Claim 18 (depends on 17) The weight-adjustable dumbbell according to claim 17, wherein an inner side wall of the counterweight block shell is provided with a fixed clamping block, and an outer wall of the fixed cover plate is provided with a fixed clamping slot that is matched with the fixed clamping block; an insertion slot is arranged on one side of the fixed cover plate of each of the main counterweight blocks and the auxiliary counterweight blocks except the outermost auxiliary counterweight block; a positioning ball is slidably inserted into the insertion slot; a positioning spring that is matched with the positioning ball is arranged in the insertion slot; and one side of the counterweight block shell away from the fixed cover plate is provided with a positioning slot that is matched with the positioning ball.