dumbbells

Abstract

Conventional adjustable weight dumbbells require users to manually attach and remove plates one by one, and it is also difficult to adjust the length of the grip bar when adjusting the weight. [Solution] The grip bar includes a rotating drum and an extendable bar drilled into the rotating drum. This allows the drive wheel of the weight adjustment mechanism to work in conjunction with the extendable grip bar, allowing the user to automatically and selectively attach different numbers of weight plates by rotating the grip bar. This eliminates the need to manually attach and remove plates one by one, greatly simplifying operations before and during use. In addition, the engagement structure between the drive wheel and two-way groove rails allows the extendable bar to extend a fixed length each time the grip bar is rotated, enabling quantitative and precise control of the extension length while adapting to the thickness of the weight plates being attached. This significantly improves user convenience and the training experience.

Description

[Technical Field]

[0001] The present invention belongs to the technical field of fitness equipment and relates to dumbbells. [Background technology]

[0002] Dumbbells are aids for fitness training and are mainly divided into two types: commercial and home use. Commercial dumbbells have the advantage of space-saving and can be directly installed in multiple units of different specifications. However, for home use dumbbells, which are required for use in small household spaces, most conventional commercially available products are detachable. Before use, multiple independent dumbbell plates must be attached to the handle in order and fastened with connectors such as bolts. This involves many steps, making the installation preparation work before use and the weight change operation during use extremely cumbersome for users, which can easily affect users' motivation to train and create a poor user experience. Furthermore, these detachable dumbbells require the handle to be left longer to accommodate different weights, and a handle that is too long further affects the user's user experience.

[0003] Reference 1 (CN219646634U) discloses technology related to telescoping mechanisms, dumbbells, and dumbbell kits. However, the adjustable weight dumbbells in Reference 1 require the user to manually remove and attach plates one by one, which is cumbersome and time-consuming, and can lead to interruptions during training and reduced safety. Additionally, adjusting the length of the grip bar to adjust the weight is difficult, resulting in problems such as a lack of quantitative and reproducible operation. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Chinese Utility Model Patent CN219646634U Summary of the Invention [Problem to be solved by the invention]

[0005] The present invention provides a dumbbell to overcome the deficiencies of the prior art. [Means for solving the problem]

[0006] To achieve the above object, the present invention adopts the following technical solutions.

[0007] a dumbbell comprising a gripping bar, a weight adjustment mechanism, and a plurality of sets of weight plates respectively provided at both axial ends of the gripping bar; the gripping bar comprises a rotating drum and an extendable bar drilled into the rotating drum; the weight adjustment mechanism comprises a toothed disk and a rotating disk provided coaxially with the rotating drum; the rotating disk is fixedly connected to the rotating drum, and a drive wheel is provided circumferentially of the rotating disk; a plurality of grooves are provided on an end face of the toothed disk so as to be spirally distributed; a plurality of first-direction subrails and second-direction subrails are provided which are connected in sequence at equal intervals along the circumferential direction of the grooves; the first-direction subrail is provided circumferentially of the toothed disk, and the second-direction subrail is inclined at a set angle relative to the first-direction subrail in the radial direction of the toothed disk; the extendable bar is provided with a plurality of tooth grooves distributed in an array along the axial direction; and the drive wheel simultaneously engages with the grooves and the tooth grooves.

[0008] Furthermore, a ball plunger is fixedly mounted on the rotating disk, the ball plunger including a sleeve and a bead head, a spring is provided within the sleeve to abut the bead head against the opening of the sleeve, and a plurality of stopper grooves are provided in an annular array along the circumferential direction on the end surface of the toothed disk, and the bead head and the stopper grooves tend to engage with each other while the rotating disk rotates.

[0009] Furthermore, a plurality of the drive wheels are provided and are distributed in an annular array centered on the axis of the rotary drum.

[0010] The rotational disc further includes a count assembly including a count ring, a planetary gear group, a ring gear, and a count gear, wherein the count gear is coaxially mounted on the rotating disc, the count ring is coaxially fitted on the outer periphery of the rotating disc, the planetary gear group is mounted circumferentially around the count ring, and the ring gear is fixedly mounted, the inner and outer sides of the planetary gear group mesh with the count gear and the ring gear, respectively, and a weight marker is mounted on the outer periphery of the count ring.

[0011] The rotating disk further includes a weight half plate, a hanging engagement portion provided upward in the center of the weight half plate, and a plurality of flanges arranged in a ring-shaped array around the outer periphery of the rotating disk, and the flanges are located directly below the hanging engagement portion at a set rotational position of the rotating disk.

[0012] Further, the locking disc is provided on the outer periphery of the rotary disc, The rotating disc is provided with link teeth on its outer periphery, the locking disc is provided with rotation stop teeth on its inner periphery, and the locking disc is provided with a thrust spring that engages the rotation stop teeth with the link teeth.

[0013] Further, the dumbbell further includes a base for placing the dumbbell, The base is provided with a push-up block for vertically abutting against the locking disc.

[0014] Further comprising a locking block; The weight plate has a disk-shaped structure with a set thickness, a through hole in the center of the weight plate for the telescopic rod to pass through, and a notch on the outer periphery of the weight plate for inserting the locking block, and the locking block is connected to two adjacent weight plates.

[0015] Furthermore, the weight plate has a notch at the top and bottom, an insertion groove for inserting the locking block into the inner wall of the notch, a plug is drilled into the insertion groove, and the locking block has a semicircular opening on its outer periphery for engaging with the outer periphery of the plug. The locking block has a locking groove and a locking plate, and the locking groove and the locking plate are engaged with and connected to the adjacent locking plate and the adjacent locking groove, respectively.

[0016] Furthermore, the weight adjustment mechanism further includes an end plate, a case, a counting assembly, a weight half plate, and a locking disc; the end plate is fixedly connected to the case and forms a cavity for accommodating the rotating disk, the outer end surface of the end plate is connected to the weight plate, the toothed disk is fixedly connected to the inner end surface of the end plate, the rotating drum is drilled into the case and the end plate, the outer periphery of the drive wheel is provided with spherical teeth, the rotational plane of the drive wheel overlaps with the axis of the rotating drum, and a through groove is opened in the outer wall of the rotating drum for the drive wheel to pass through; the count assembly includes a count ring, a planetary gear group, a ring gear, and a count gear, the count gear is provided coaxially on the rotary disk, the count ring is coaxially fitted on the outer periphery of the rotary disk, the planetary gear group is provided in the circumferential direction of the count ring, the ring gear is provided on the inner periphery of the case, the inner and outer sides of the planetary gear group mesh with the count gear and the ring gear, respectively, a weight marker is provided on the outer periphery of the count ring, and a window is opened in the outer wall of the case to allow observation of the outer periphery of the count ring, The weight half plate is provided on the underside of the case, and a hanging engagement part is provided in the middle part thereof facing upward, and an opening is provided in the bottom part of the case so that the hanging engagement part can pass through upward, The locking disc is provided on the outer periphery of the rotary disc, and a push-up spring is provided on the locking disc, and both ends of the push-up spring are connected to the locking disc and the end plate, respectively. [Effects of the Invention]

[0017] As described above, the beneficial effects of the present invention are as follows:

[0018] The dumbbell of the present invention, which combines a handle, weight plates, and a weight adjustment mechanism, allows the user to install different numbers of weight plates by directly rotating the handle through the linkage between the drive wheel of the weight adjustment mechanism and the extendable handle, eliminating the need to install them one by one, greatly simplifying the operations required for users to change weight plates before and during use. At the same time, the drive wheel and the two-way groove rail are fitted together, so that as the user continues to rotate the handle, the extendable handle extends by a certain length each time, which is appropriate for the thickness of the weight plates, allowing the user to accurately and quantitatively control the extension length, greatly improving the user experience. [Brief explanation of the drawings]

[0019] [Figure 1] 1 is a structural schematic diagram of the dumbbell and base of the present invention; FIG. [Figure 2] FIG. 2 is a schematic cross-sectional view of the structure of FIG. [Figure 3] 3 is a schematic cross-sectional view of another embodiment of FIG. 2. FIG. [Figure 4] 3 is a schematic diagram of a partial structure inside the weight adjustment mechanism of the present invention. FIG. [Figure 5] FIG. 5 is a schematic exploded view of the structure of FIG. 4. [Figure 6] FIG. 6 is a schematic exploded view of another embodiment of FIG. 5. [Figure 7]5 is a schematic exploded view of the structure of FIG. 4 from another viewpoint. [Figure 8] FIG. 8 is a schematic exploded view of another embodiment of FIG. 7. [Figure 9] 1 is a structural schematic diagram of a rotating disk and a locking disk in the present invention. FIG. [Figure 10] FIG. 2 is a schematic diagram of the meshing structure between the drive wheel, toothed disc, and expansion rod in the present invention. [Figure 11] FIG. 11 is a structural schematic diagram of another embodiment of FIG. [Figure 12] FIG. 11 is a structural schematic diagram of the toothed disc in FIG. 10. [Figure 13] FIG. 12 is a structural schematic diagram of the toothed disc in FIG. 11. [Figure 14] 1 is a structural schematic diagram of a rotating disk and a driving wheel according to the present invention; [Figure 15] FIG. 15 is a structural schematic diagram of another embodiment of FIG. 14. [Figure 16] FIG. 2 is a schematic view of the structure of a base according to the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0020] Hereinafter, embodiments of the present invention will be described using specific examples. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention may be implemented or applied in different specific embodiments, and each detail of the specification may be modified or changed in various ways based on different perspectives and applications without departing from the spirit of the present invention. In addition, the following examples and features in the examples may be combined with each other if there is no conflict.

[0021] It should be noted that the drawings provided in the following examples are merely for the purpose of roughly explaining the basic concept of the present invention, and therefore the drawings show only assemblies related to the present invention, not the number, shape, or size of the assemblies in actual implementation, and the form, number, and proportion of each assembly in actual implementation may be changed arbitrarily, and the layout form of the assembly may also be more complex.

[0022] In an embodiment of the present invention, all directional instructions (e.g., up, down, left, right, front, back, horizontal, vertical, etc.) are merely used to describe the relative positional relationships and movement situations between parts in a specific posture, and when the specific posture changes, the directional instructions also change accordingly.

[0023] Due to mounting errors and other factors, the parallel relationship referred to in the embodiments of the present invention may actually be an approximate parallel relationship, and the perpendicular relationship may actually be an approximate perpendicular relationship.

[0024] As shown in FIG. 1, this embodiment provides a dumbbell including a grip bar, weight plates 3 located on both sides of the grip bar, and a weight adjustment mechanism that securely connects the grip bar to any set number of weight plates 3.

[0025] Specifically, referring to Figures 2, 3, 4, 5 and 6, the grip bar includes a rotating drum 11 and an extendable rod 12. The rotating drum 11 has a hollow, straight tubular structure, and the outer periphery of the rotating drum 11 is knurled to prevent slipping. The extendable rod 12 is drilled into the rotating drum 11 along the axial direction of the rotating drum 11 and is loosely fitted into the rotating drum 11 to enable rotational movement and axial movement relative to the rotating drum 11, and is installed symmetrically on both sides of the axial direction within the rotating drum 11.

[0026] The weight plates 3 have a disk-like structure with a set thickness, and their outer shapes include, but are not limited to, circular, rectangular, polygonal, etc. Multiple sets of weight plates 3 are stacked and arranged in sequence along the axial direction of the rotating drum 11, with multiple sets of weight plates 3 provided at each end of the axial direction of the rotating drum 11, and a through-hole 31 is drilled through the center of the weight plates 3, and when the weight plates 3 are installed, the through-hole 31 is positioned on the axis of the rotating drum 11, so that the telescopic rod 12 can pass through the through-hole 31 when moving in the axial direction.

[0027] Two sets of weight adjustment mechanisms are provided, one at each end of the rotating drum 11 in the axial direction to connect two weight plates 3 on either side of the rotating drum 11 to both ends of the rotating drum 11. The weight adjustment mechanism includes an end plate 22 and a case 21, which are fixedly connected to each other and form a cavity inside. The rotating drum 11 is drilled in the case 21 and end plate 22 in order along its axial direction, thereby simultaneously passing through the cavity and being rotatable relative to both the case 21 and the end plate 22, and the outer end surface of the end plate 22 abuts and connects to the weight plate 3 closest to it on the corresponding side.

[0028] 7, 8, 10, 11, 14 and 15, the weight adjustment mechanism further includes a rotating disc 23, a drive wheel 24 and a toothed disc 25, which are provided in the cavity. The toothed disc 25 is fixedly provided on the inner end surface of the end plate 22, is coaxial with the inner end surface, and has a hollow center to allow the rotating drum 11 or the expansion rod 12 to pass through. The rotating disc 23 is coaxially fitted onto the outer periphery of the rotating drum 11, and forms a fixed connection with the rotating drum 11 by a spline or the like to prevent rotation, and when the rotating drum 11 rotates, the rotating disc 23 rotates synchronously. A plurality of drive wheels 24 are arranged radially around the outer periphery of the rotating drum 11, and the axes of the drive wheels 24 are perpendicular to the axis of the rotating drum 11. More specifically, the rotational plane of the drive wheels 24 overlaps with the axis of the rotating drum 11. The rotating disk 23 is provided with locking grooves for the wheel axles of the drive wheels 24 to engage with. When the rotating disk 23 rotates, it synchronously rotates the entire drive wheels 24 circumferentially around the axis of the rotating drum 11.

[0029] In some preferred embodiments, three or two drive wheels 24 are provided, distributed in an annular array around the axis of the rotating drum 11 to improve the stability of the drive transmission of the drive wheels 24.

[0030] 10, 11, 12 and 13, the outer periphery of the drive wheel 24 is provided with a spherical tooth structure, and a plurality of grooves are provided on the end face of the toothed disc 25 along the circumferential direction in a spirally arranged sequence, and one or more spherical teeth and the plurality of grooves on the drive wheel 24 form a spherical engagement, and the grooves form a rail for the spherical toothed disc 25 to move along the circumferential direction during the circumferential rotation of the drive wheel 24. When the rail is provided along the circumferential direction of the toothed disc 25, it has a first direction and a second direction. In this embodiment, the annular array of rails along the circumferential direction of the toothed disc 25 is divided into multiple parts including a plurality of first direction subrails 251 and a plurality of second direction subrails 252, the first direction subrails 251 and the second direction subrails 252 are arranged to be connected in sequence at intervals, the circumferential direction of the first direction subrails 251 and the circumferential direction of the toothed disc 25 are the same, and the second direction subrails 252 are inclined outwardly along the radial direction of the toothed disc 25 relative to the first direction subrail 251 by a set angle, and preferably there are three first direction subrails 251 and three second direction subrails 252.

[0031] The spherical teeth and the rail form a spherical engagement, and while the drive wheel 24 rotates in the circumferential direction, the spherical teeth move circumferentially along the rail. When the drive wheel 24 moves from one end to the other end of any one of the first direction rails, the spherical teeth 24 do not rotate, and when the drive wheel 24 moves from one end to the other end of any one of the second direction rails, the spherical teeth 24 rotate by a set angle.

[0032] There is no particular corresponding limiting relationship between the number of drive wheels 24 and the number of grooves, and it is sufficient that at the same time, multiple drive wheels 24 each mesh with the same position on multiple first direction sub-rails 251 or each mesh with the same position on multiple second direction sub-rails 252.

[0033] A through groove 111 is formed in the outer wall of the rotating drum 11, and the through groove 111 is connected to the inside of the rotating drum 11. The outer periphery of the telescopic rod 12 is provided with multiple sets of tooth rows, each including multiple tooth grooves 121 arranged in an array along the axial direction of the telescopic rod 12, and the multiple sets of tooth rows are specifically distributed in an annular array along the circumferential direction of the telescopic rod 12, and are used to mesh with multiple driving wheels 24, respectively. A portion of the driving wheel 24 passes through the through groove 111 so that the spherical teeth and the tooth grooves 121 form spherical engagement, and the driving wheel 24 drives the telescopic rod 12 to move in the axial direction when rotating.

[0034] To set the dumbbell weights, first, multiple sets of weight plates 3 are installed on each side of the grip bar, preferably with the same number of weight plates 3 on each side. The user grips the rotating drum 11 and directly drives it to rotate, causing the rotating disc 23 and driving wheel 24 to rotate in a circumferential direction. The driving wheel 24, driven by the toothed disc 25, rotates, moving and extending the telescopic rod 12, which rotates the rotating drum 11 by a set angle and thereby extends the telescopic rod 12 by a set length. The telescopic rod 12 penetrates the multiple sets of weight plates 3 along its axial direction, thereby forming vertical contact support for the penetrated weight plates 3, allowing the dumbbell to be pulled up and used.

[0035] To intuitively display the set weight to the user, the weight adjustment mechanism further includes a counting assembly. Referring to FIGS. 1, 4, 7, and 8, the counting assembly includes a counting ring 27, a planetary gear set 271, and a counting gear 231. The counting gear 231 and the rotating disk 23 are coaxially and fixedly connected to the rotating disk 23, and the planetary gear set 271 is radially mounted on the outer periphery of the rotating drum 11. In this embodiment, the planetary gear set 271 preferably includes a plurality of planetary gears, which are arranged in an annular array around the rotating drum 11. A ring gear is provided on the inner periphery of the case 21. The planetary gears mesh with the ring gear at their outer ends and with the counting gear 231 at their inner ends. Therefore, when the rotating drum 11 rotates, causing the rotating disk 23 and the counting gear 231 to rotate, the planetary gears rotate in the circumferential direction.

[0036] The count ring 27 is fitted coaxially onto the outer periphery of the rotating drum 11 and is rotatable relative to the rotating drum 11. One axial end of the central axis of the planetary gear is drilled into the count ring 27, so that the planetary gear rotates the count ring 27 synchronously during its circumferential rotation. The outer surface of the count ring 27 is provided with a plurality of weight markers arranged in sequence along the circumferential direction. Specifically, the weight markers are kilogram numerical symbols, each corresponding to a different weight information. A window is opened at the top of the case 21, allowing the user to observe the kilogram numerical symbol at the current position through the window.

[0037] Furthermore, a plurality of hemispherical stopper grooves are provided on the end surface of the toothed disk 25 so as to be arranged in an annular array along the circumferential direction, and a plurality of ball plungers 234 are provided on the end surface of the rotating disk 23 facing the toothed disk 25 so as to be arranged in an annular array along the circumferential direction. The ball plunger 234 includes a sleeve and a bead head, one end of the sleeve is fixedly connected to the rotating disk 23 and the other end of the sleeve is provided as an open structure. The bead head is engaged with the opening of the sleeve and is movable into the sleeve, and a spring is provided inside the sleeve to maintain the bead head in the opening, and the side of the bead head of the ball plunger 234 facing the toothed disk 25 abuts against the end surface of the toothed disk 25. When the bead head portion is pushed into the sleeve, the circumference formed by the distribution of the multiple ball plungers and the circumference formed by the distribution of the multiple stopper grooves have the same inner diameter, so while the rotating disk 23 is rotating, the ball plungers 234 rotate in the circumferential direction along the end face of the toothed disk 25. During this circumferential rotation, one of the bead heads faces one of the stopper grooves and is thrown into the stopper groove. As the rotating disk 23 continues to rotate, the bead head escapes from the stopper groove and re-engages with the next stopper groove in the movement direction.

[0038] In this embodiment, preferably, the spacing between adjacent tooth grooves 121 in the tooth row is equal to the thickness of one weight plate 3, and the telescopic rod 12 can carry one more weight plate 3 along its extended length each time it moves in the axial direction by the spacing between a pair of tooth grooves 121. At the same time, the drive wheel 24 can move along the toothed disc 25 by the distance between one adjacent first direction sub-rail 251 and one adjacent second direction sub-rail 252, and the rotating disc 23 can rotate relative to the toothed disc 25 by the angle between two adjacent stopper grooves, allowing the ball plunger 234 to move from one stopper groove to the next and engage with it.

[0039] With the installation of the counting assembly, when the user operates the grip rod to set the weight plate 3, the linked counting ring 27 rotates synchronously by a corresponding angle while the rotating drum 11 is rotating, thereby displaying the current kilogram numerical code in real time on the window, so that the user can obtain information about the weight of the weight plate 3 currently mounted on the grip rod by observing the window. In addition, during operation, the engagement action of the ball plunger 234 with the stopper groove also generates tactile feedback corresponding to the grip rod, which can be perceived by the user.

[0040] In order to ensure tight axial stacking of the multiple sets of weight plates 3 and prevent the weight plates 3 from falling off during use of the dumbbell, this embodiment further provides a locking block. Referring to Figures 1, 5 and 6, the locking block includes one first locking block 331 for connecting the end plate 22 and the weight plate 3, and multiple second locking blocks 332 for connecting adjacent weight plates 3.

[0041] Specifically, a boss-shaped notch 32 is provided around the circumference of the weight plate 3. In this embodiment, notches 32 are provided at the top and bottom of the weight plate 3, an insertion groove is recessed in the inner wall of the notch 32, and a plug is drilled along the axial direction of the weight plate 3 so as to pass through the insertion groove. The second locking block 332 has a boss-shaped structure and is engaged with the notch 32 of the weight plate 3 to make the weight plate 3 completely circular. The outer wall of the second locking block 332 is provided with an insertion seat, which has a semicircular opening that fits over the outer periphery of the plug. The insertion seat is inserted into the insertion groove and restricted by the engagement plug, thereby achieving a tight fit between the second locking block 332 and the weight plate 3. The second locking block 332 is provided with a locking groove and a locking plate, in sequence. When multiple sets of weight plates 3 are installed, the locking groove of the current second locking block 332 is used to engage with the locking plate of the second locking block 332 of the adjacent previous weight plate 3. The locking plate of the current second locking block 332 is engaged with the locking groove of the second locking block 332 of the adjacent subsequent weight plate 3, thereby achieving a tight connection between the multiple sets of weight plates 3.

[0042] A boss-shaped notch 32 is also provided around the periphery of the end plate 22, and one side of the first locking block 331 is inserted into the notch 32 and tightly fitted to the end plate 22, while the other side is provided with a locking plate for insertion into the locking groove of the second locking block 332 of the nearest adjacent weight plate 3, thereby realizing a tight-fit connection between the weight plate 3 and the end plate 22.

[0043] In order to stably place the dumbbells and allow the user to easily adjust the weight, this embodiment further includes a base 4, and as shown in Figures 1 and 16, the grip bar and weight plate 3 are removably placed on the base 4.

[0044] In some embodiments, the weight adjustment mechanism further includes a weight half-plate 28. Referring to Figures 4, 7, and 8, the weight half-plate 28 has a crescent-shaped structure connected to the underside of the case 21 with its opening facing upward. The base 4 is provided with a groove 41 that engages with the weight half-plate 28. Both ends of the weight half-plate 28 abut against the case 21 to prevent and limit rotation. The weight of the weight half-plate 28 may be set to half the weight of the weight plate 3.

[0045] A hanging latch 281 is provided facing upward in the center of weight half plate 28, an opening is provided in the bottom of case 21 through which hanging latch 281 extends upward into the cavity, and a plurality of flanges 233 are arranged in an array in the circumferential direction on the outer periphery of rotating disk 23, and while rotating disk 23 is rotating, flanges 233 can move to directly below hanging latch 281. At this time, when the dumbbell is lifted, the engagement between flanges 233 and hanging latch 281 allows the dumbbell half plates to be lifted all at once.

[0046] In some preferred embodiments, referring to FIG. 14, three flanges 233 may be provided, and when adjusting the weight, if a single weight plate 3 is one unit, the weight on one side of the grip bar may optionally be accumulated in weights of 1 unit, 1.5 units, 2 units, and so on down to 0.5 units.

[0047] In another preferred embodiment, referring to FIG. 15, four more flanges 233 may be provided.

[0048] The weight adjustment mechanism further includes a locking disc 26 for locking the rotating disc 23 and preventing the rotating disc 23 from rotating when the dumbbell is lifted. Specifically, referring to FIG. 9, the locking disc 26 is disposed within a cavity, and a push-up spring 261 is disposed between the locking disc 26 and the end plate 22. Both ends of the push-up spring 261 are connected to the locking disc 26 and the end plate 22, respectively. The push-up spring 261 is disposed vertically, providing a vertical elastic force to the locking disc 26.

[0049] The locking disc 26 is provided in an annular shape on the outer periphery of the rotating disc 23, and link teeth 232 are provided on the outer peripheral wall of the rotating disc 23. The locking disc 26 is provided with anti-rotation teeth 262 facing the inner wall of the rotating disc 23, and the anti-rotation teeth 262 are located above the rotating disc 23. When not subjected to any external force, the locking disc 26 moves downward under the elastic force of the thrust spring 261, and the anti-rotation teeth 262 downwardly engage with the link teeth 232, and at this time, a rotation-stopping effect is created for the rotating disc 23.

[0050] A thrust rod extends downward from the lower end of the locking disc 26, and an opening is provided in the bottom of the case 21 so that the thrust rod can extend downward. A thrust block 42 is further provided in the base 4 at a corresponding vertical position, and when a dumbbell is placed on the base 4, the thrust rod and thrust block 42 abut directly opposite each other, and the thrust block 42 pushes the thrust rod upward, moving the locking disc 26 upward. At this time, the rotation stop tooth 262 disengages from the link tooth 232, and when the dumbbell is placed on the base 4, the weight can be adjusted as desired.

[0051] Obviously, the described embodiments are only some of the embodiments of the present invention, not all of the embodiments, and all other embodiments that a person skilled in the art can obtain based on the embodiments of the present invention without performing creative work should fall within the scope of protection of the present invention. [Explanation of symbols]

[0052] 11. Rotating drum 111. Through groove 12, telescopic rod 121, tooth groove 21. Case 22, end plate 23. Rotating disc 231 - Counting gear 232, link teeth 233 , flange 234 - Ball plunger 24. Drive wheels 25, toothed disc 251, 1st direction sub-rail 252, second direction sub-rail 253, stopper groove 26. Locking disc 261, thrust spring 262, rotation stop tooth 27. Counting Ring 271, planetary gear set 28. Weight half plate 281, hanging latch 3. Weight plate 31. Through hole 32. Notch 331, First Locking Block 332, second locking block 4. Base 41. Groove 42. Thrust block.

Claims

1. A dumbbell, The device includes a grip bar, a weight adjustment mechanism, and a plurality of weight plates (3) provided at both ends of the grip bar in the axial direction, The gripping rod includes a rotating drum (11) and an extensible rod (12) drilled in the rotating drum (11). The weight adjusting mechanism includes a toothed disk (25) and a rotating disk (23) that are provided coaxially with the rotating drum (11). The rotating disk (23) is fixedly connected to the rotating drum (11). A drive wheel (24) is provided around the rotating disk (23). A plurality of grooves are spirally distributed on the end surface of the toothed disk (25). The grooves are connected in sequence at equal intervals along the circumferential direction. a first direction sub-rail (251) and a second direction sub-rail (252), the first direction sub-rail (251) being provided along the circumferential direction of the toothed disc (25), the second direction sub-rail (252) being inclined at a set angle along the radial direction of the toothed disc (25) relative to the first direction sub-rail (251), the telescopic rod (12) being provided with a plurality of tooth grooves (121) distributed in an array along the axial direction, and the drive wheel (24) simultaneously engaging with the grooves and the tooth grooves (121).

2. 2. The dumbbell of claim 1, wherein a ball plunger (234) is fixed to the rotating disk (23), the ball plunger (234) including a sleeve and a bead head, a spring is provided in the sleeve for abutting the bead head against the opening of the sleeve, and a plurality of stopper grooves are provided in an annular array on the end surface of the toothed disk (25) along the circumferential direction, and the bead head and the stopper grooves tend to engage with each other during rotation of the rotating disk (23).

3. The dumbbell according to claim 1, characterized in that a plurality of the drive wheels (24) are provided and are distributed in an annular array around the axis of the rotating drum (11).

4. 2. The dumbbell of claim 1, further comprising a count assembly including a count ring (27), a planetary gear set (271), a ring gear, and a count gear (231), wherein the count gear (231) is coaxially mounted on the rotating disk (23), the count ring (27) is coaxially fitted on the outer periphery of the rotating disk (23), the planetary gear set (271) is mounted circumferentially around the count ring (27), the ring gear is fixed, the inner and outer sides of the planetary gear set (271) mesh with the count gear (231) and the ring gear, respectively, and a weight marker is provided on the outer periphery of the count ring (27).

5. 2. The dumbbell of claim 1, further comprising a weight half-plate (28), wherein a hanging hook (281) is provided in the center of the weight half-plate (28) facing upward, and a plurality of flanges (233) are provided in a ring-shaped array around the outer periphery of the rotating disk (23), and the flanges (233) are located directly below the hanging hook (281) when the rotating disk (23) is in a set rotation position.

6. The device further includes a locking disc (26) provided on the outer periphery of the rotating disc (23), 2. The dumbbell of claim 1, wherein the rotating disc (23) has link teeth (232) on its outer periphery, the locking disc (26) has rotation stop teeth (262) on its inner periphery, and the locking disc (26) has a thrust spring (261) that engages the rotation stop teeth (262) with the link teeth (232).

7. It further includes a base (4) for placing the dumbbells, 7. The dumbbell according to claim 6, wherein the base (4) is provided with a push-up block (42) for vertically abutting the locking disc (26).

8. further comprising a locking block; 2. The dumbbell of claim 1, wherein the weight plate (3) has a disk-shaped structure with a set thickness, the center of the weight plate (3) is provided with a through-hole (31) through which the telescopic rod (12) passes, and the outer periphery of the weight plate (3) is provided with a notch (32) through which the locking block is inserted, and the locking block is connected to two adjacent weight plates (3).

9. 9. The dumbbell of claim 8, wherein the weight plate has a top and a bottom notch, the inner wall of the notch has an insertion groove for inserting the locking block, a plug is drilled into the insertion groove, the outer periphery of the locking block has a semicircular opening for engaging with the outer periphery of the plug, the locking block has a locking groove and a locking plate, and the locking groove and the locking plate are respectively engaged with the adjacent locking plate and the adjacent locking groove.

10. The weight adjustment mechanism further includes an end plate (22), a case (21), a counting assembly, a weight half plate (28), and a locking disc (26); The end plate (22) is fixedly connected to the case (21) and forms a cavity for accommodating the rotating disk (23). The outer end surface of the end plate (22) is connected to the weight plate (3). The toothed disk (25) is fixedly connected to the inner end surface of the end plate (22). The rotating drum (11) is drilled into the case (21) and the end plate (22). The outer periphery of the driving wheel (24) is provided with spherical teeth. The rotational plane of the driving wheel (24) overlaps with the axis of the rotating drum (11). A through groove (111) is opened in the outer wall of the rotating drum (11) for the driving wheel (24) to pass through. The count assembly includes a count ring (27), a planetary gear set (271), a ring gear, and a count gear (231), the count gear (231) is coaxially mounted on the rotating disk (23), the count ring (27) is coaxially fitted on the outer periphery of the rotating disk (23), the planetary gear set (271) is mounted in the circumferential direction of the count ring (27), the ring gear is mounted on the inner periphery of the case (21), the inner and outer sides of the planetary gear set (271) are engaged with the count gear (231) and the ring gear, respectively, a weight marker is mounted on the outer periphery of the count ring (27), and a window is opened in the outer wall of the case (21) for observing the outer periphery of the count ring (27). The weight half plate (28) is provided on the underside of the case (21), and a hanging engagement part (281) is provided in the middle part thereof facing upward. An opening is provided in the bottom part of the case (21) so that the hanging engagement part (281) can pass through upward.

2. The dumbbell according to claim 1, wherein the locking disc (26) is provided on the outer periphery of the rotating disc (23), and a thrust spring (261) is provided on the locking disc (26), and both ends of the thrust spring (261) are connected to the locking disc (26) and the end plate (22), respectively.

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