CN218944251U - Dumbbell convenient to adjust counter weight - Google Patents

Abstract

The utility model relates to a dumbbell convenient for adjusting a counterweight, which comprises a dumbbell body and two groups of counterweight sheets, wherein the dumbbell body comprises a grab handle and two dumbbell heads, two telescopic rods are movably arranged in the grab handle in a penetrating manner, spiral grooves are formed in the outer circle surfaces of the two telescopic rods, a plurality of balls are respectively arranged on the peripheral walls of the left end and the right end of the grab handle, positioning blocks are respectively arranged in the left end and the right end of the grab handle, positioning grooves are formed in the positioning blocks, one part of balls at each end of the grab handle fall into the positioning grooves, the other part of balls are positioned outside the positioning grooves and are matched with the spiral grooves corresponding to the outer circle surfaces of the telescopic rods, and when the grab handle is rotated, the balls at each end of the grab handle are mutually switched between the positioning grooves and the spiral grooves on the outer circle surfaces of the telescopic rods, so that the two telescopic rods are driven to extend along the axial direction of the grab handle to be connected with the counterweight sheets or retract to be separated from the counterweight sheets. The utility model has the advantages of simple structure, easy installation and manufacture, low cost, easy and labor-saving counterweight adjustment operation, high reliability and the like.

Description

Dumbbell convenient to adjust counter weight

Technical Field

The utility model relates to a dumbbell convenient for adjusting a counterweight, and belongs to the technical field of body-building equipment.

Background

Dumbbell is taken as common fitness equipment and is favored by various fitness enthusiasts. The existing adjustable dumbbell, such as the most common nut locking type, needs users to detach or install dumbbell pieces one by one and then lock with a spanner, and is complicated to use.

In order to facilitate adjustment of dumbbell plates, chinese patent No. 113144514a discloses a fast adjustment dumbbell, including a dumbbell body, fixed dumbbell plates fixed at both ends of the dumbbell body and movable dumbbell plates that can be accumulatively mounted on the fixed dumbbell plates, the dumbbell body includes holding rods, planetary gear system and telescopic links, planetary gear system is provided with a set of respectively at both ends of holding rods, planetary gear system includes gear shaft, planet wheel, planet carrier and ring gear, wherein the gear shaft is as the coaxial setting of sun gear and holding rods, the planet wheel meshes in the gear shaft, the ring gear meshes in the planet wheel, the planet carrier is fixed to be set up, the ring gear is connected with the holding rods in a linkage, thereby the ring gear can rotate with the holding rods in step, the gear shaft has the shaft hole, the telescopic links are worn to stretch in this shaft hole, the telescopic links pass through spiral pair spiral transmission in the gear shaft, thereby the number of the movable dumbbell plates at both ends of the main body can be hung along the gear shaft when the gear shaft rotates. The dumbbell of this construction has the following drawbacks:

1) The adjusting structure is complex, so that the installation and the manufacture are inconvenient, the cost is high, and the large-scale production and the popularization are not facilitated;

2) The adjusting operation is not easy and labor-saving enough, particularly, as the transmission fit between the gear shaft and the telescopic rod is realized through the screw fit of the spiral groove on the inner wall of the gear shaft and the external screw thread on the outer wall of the telescopic rod, the transmission contact area between the gear shaft and the telescopic rod is relatively large, larger resistance is brought to the rotation operation of the holding rod, and the transmission resistance of the planetary gear system is overcome when the holding rod is rotated, so that under the double resistance, a user needs to apply larger force to rotate the holding rod, thereby affecting the convenience and labor saving of the adjusting operation.

Disclosure of Invention

The utility model aims to overcome the defects of the prior art and provide the dumbbell which is convenient for adjusting the counterweight, simple in structure, easy to install and manufacture, low in cost, easy and labor-saving in adjusting operation and high in reliability.

The aim of the utility model is realized by the following technical scheme:

the dumbbell comprises a dumbbell body and two groups of weight plates, wherein the dumbbell body comprises a grab handle and two dumbbell heads arranged at the left end and the right end of the grab handle; two telescopic rods which are approximately semicircular in shaft shape are movably arranged in the grab handle in a penetrating mode, the two telescopic rods are attached in opposite directions and are staggered at certain positions, a plurality of spiral grooves which are distributed at intervals along the axial direction are formed in the outer circle surfaces of the two telescopic rods, and the spiral directions of the spiral grooves on the outer circle surfaces of the two telescopic rods are opposite; the left end and the right end of the grab handle are respectively provided with a plurality of balls distributed at intervals along the circumferential direction, the interiors of the left end and the right end of the grab handle are respectively provided with a positioning block, the positioning blocks are provided with positioning grooves, one end of each positioning block is exposed out of the grab handle and fixed on the corresponding dumbbell head, one part of balls at each end of the grab handle fall into the positioning grooves, and the other part of balls are positioned outside the positioning grooves and are matched with the spiral grooves on the outer circle surfaces of the corresponding telescopic rods; the grab handle can rotate relative to the two dumbbell heads, and along with the rotation of the grab handle, balls at each end of the grab handle are mutually switched between the positioning groove and each spiral groove on the outer circle surface of the telescopic rod, so that the two telescopic rods are driven to axially extend or retract along the grab handle; the two sets of weight plates are used for being connected to the two telescopic rods when the two telescopic rods extend or being separated from the two telescopic rods when the two telescopic rods retract.

Further, the locating piece is including being located in the grab handle and laminating in opposite directions with corresponding telescopic rod end, the constant head tank is for running through in the arc wall of this semicircular block portion excircle surface along circumference, the locating piece still including expose in the fixed part of grab handle, be equipped with on the dumbbell head and supply this fixed part embedding and fixed slot.

Further, limiting grooves extending along the respective length directions are respectively arranged on opposite joint surfaces of the two telescopic rods, and limiting protruding blocks in sliding fit with the corresponding limiting grooves are respectively arranged on the surfaces of the semicircular block parts of the two positioning blocks, which are opposite to the ends of the corresponding telescopic rods.

Further, the two dumbbell heads comprise limiting discs sleeved outside the corresponding end parts of the grab handles in a gap mode, dumbbell sheets are fixedly connected to the outer sides of the limiting discs, first center holes for the corresponding telescopic rods to penetrate through are formed in the centers of the dumbbell sheets, a gear disc is fixedly sleeved at the left end and the right end of the grab handles respectively, and the gear disc is located on the inner sides of the limiting discs and rotatably connected with the inner sides of the limiting discs.

Further, a plurality of gear grooves distributed at intervals along the circumferential direction are formed in the gear disc, a limiting block capable of moving radially and a spring which is located at the inner side of the limiting block and used for enabling the limiting block to keep the radial outward movement trend are arranged on the limiting disc, and when no external force acts, the limiting block is clamped into one of the gear grooves under the action of the spring, so that the gear disc is in a locking state.

Further, the dumbbell comprises a storage seat, wherein the storage seat is provided with two bearing positions arranged at left and right intervals and two storage areas respectively positioned at the outer sides of the two bearing positions, the two bearing positions are used for respectively bearing the two limiting plates of the dumbbell body, and the two storage areas are used for respectively storing the two sets of weight pieces.

Further, the stopper is located the lower extreme of limiting plate, all be equipped with on two bearing positions and support the piece, work as dumbbell body is placed through two limiting plate on two bearing positions, the stopper by support the piece and deviate from the gear groove, and, support the piece and be located outside the horizontal projection of gear groove.

Further, the gear disc is further provided with limiting holes which are distributed at intervals along the circumferential direction and have the same number as the gear grooves, the limiting disc is provided with a limiting marble, and the limiting marble can be clamped into any one of the limiting holes at the corresponding positions along with the rotation of the gear disc.

Further, a gear identification block is arranged between two adjacent gear grooves, a gear display window is arranged on the limiting disc, and when the gear disc rotates to a required gear, the gear identification block corresponding to the gear is opposite to the gear display window and is displayed outwards.

Further, the upper end of the outer side surface of the dumbbell piece is provided with a first clamping block with a large upper part and a small lower part and a dovetail-shaped cross section, and the lower end of the outer side surface of the dumbbell piece is provided with a first clamping groove with a small upper part and a large lower part and a dovetail-shaped cross section; the two groups of weight plates all comprise a plurality of weight plates, the center of each weight plate is provided with a second center hole for the corresponding telescopic rod to pass through, the upper end of one side surface of each weight plate facing the dumbbell body is provided with a second clamping groove with a big top and a small bottom and a dovetail cross section, the lower end of one side surface of each weight plate facing the dumbbell body is provided with a second clamping block with a big top and a big bottom and a dovetail cross section, meanwhile, except for the weight plate of the last stage, the upper end of one side surface of each weight plate facing away from the dumbbell body is provided with a third clamping block with a big top and a small bottom and a dovetail cross section, and the lower end of one side surface of each weight plate facing away from the dumbbell body is provided with a third clamping groove with a big top and a big bottom and a dovetail cross section; in the two groups of weight plates, the first-stage weight plate can be clamped with the first clamping block and the first clamping groove corresponding to the outer side surface of the dumbbell piece through the second clamping groove and the second clamping block, and the next-stage weight plate can be clamped with the third clamping block and the third clamping groove of the previous-stage weight plate through the second clamping groove and the second clamping block.

Compared with the prior art, the utility model has the following beneficial effects:

firstly, the utility model greatly simplifies the balance weight adjusting structure of the dumbbell, is easy to install and manufacture, greatly reduces the cost, is beneficial to mass production and popularization of products, and is economical. And secondly, the utility model realizes adjustment by the transmission fit of a plurality of balls at the two ends of the grab handle and the spiral grooves on the outer circumferential surfaces of the two telescopic rods, thereby reducing the transmission contact area and the friction resistance, and further ensuring that the rotation adjustment operation of the grab handle is easier, more labor-saving, more flexible and reliable.

Drawings

Fig. 1 is a schematic diagram of the assembled dumbbell of this utility model.

Fig. 2 is an exploded view of the dumbbell of this utility model.

Fig. 3 is an exploded view of the dumbbell body of this utility model.

Fig. 4 is an exploded view of the transmission structure between the handle and the two telescopic rods according to the present utility model.

Fig. 5 is an exploded view of the transmission structure between the handle and the two telescopic rods.

FIG. 6 is an exploded view of the handle and gear plate and grip sleeve of the present utility model.

Fig. 7 is an exploded view of the structure of a single dumbbell head of this utility model.

Fig. 8 is a schematic perspective view of the front structure of a single weight stack of the present utility model.

Fig. 9 is a schematic rear view of a single weight stack of the present utility model.

Detailed Description

The utility model is described in further detail below with reference to examples given in the accompanying drawings.

As shown in fig. 1 to 9, the dumbbell with weight adjustment function according to the present embodiment includes a dumbbell body 1 and two sets of weight plates 2, wherein the dumbbell body 1 includes a handle 11 and two dumbbell heads 12 disposed at left and right ends of the handle 11.

Two telescopic rods 13 with approximately semicircular shaft shapes are movably arranged in the grab handle 11 in a penetrating mode, the two telescopic rods 13 are attached in opposite directions and are staggered in certain positions, and the fact that the plane parts 130 of the two telescopic rods 13 are attached face to face is understood to mean that the two telescopic rods are attached together in a face-to-face mode is similar to the fact that the two telescopic rods are attached in the opposite directions. The outer circle surfaces of the two telescopic rods 13 are provided with a plurality of spiral grooves 131 which are distributed at intervals along the axial direction, and the spiral directions of the spiral grooves 131 on the outer circle surfaces of the two telescopic rods 13 are opposite.

The peripheral walls of the left end and the right end of the grab handle 11 are respectively provided with a plurality of balls 14 which are distributed at intervals along the circumferential direction, the interiors of the left end and the right end of the grab handle 11 are respectively provided with a positioning block 15, the positioning block 15 is provided with a positioning groove 150, one end of the positioning block 15 is exposed out of the grab handle 11 and fixed on the corresponding dumbbell head 12, one part of balls 14 at each end of the grab handle 11 fall into the positioning groove 150, and the other part of balls are positioned outside the positioning groove 150 and are matched with the spiral groove 131 corresponding to the outer circle surface of the telescopic rod 13.

The grab handle 11 can rotate relative to the two dumbbell heads 12, and along with the rotation of the grab handle 11, the balls 14 at each end of the grab handle 11 are mutually switched between the positioning groove 150 and each spiral groove 131 on the outer circle surface of the telescopic rod 13, so that the two telescopic rods 13 are driven to axially extend or retract along the grab handle 11; the two sets of weight plates 2 are used for being connected to the two telescopic rods 13 when the two telescopic rods 13 extend out, or being separated from the two telescopic rods 13 when the two telescopic rods 13 retract, so that the purpose of adding or reducing weights on two sides of the dumbbell body is achieved.

In this embodiment, the positioning block 15 includes a semicircular block portion 151 located in the grab handle 11 and attached to the end portion of the corresponding telescopic rod 13 in opposite directions, the positioning groove 150 is an arc-shaped groove penetrating through the outer circumferential surface of the semicircular block portion 151 in the circumferential direction, the positioning block 15 further includes a fixing portion 152 exposed to the grab handle 11, and the dumbbell head 12 is provided with a fixing groove 120 in which the fixing portion 152 is embedded and fixed.

Further, the opposite abutting surfaces (i.e. the plane parts 130) of the two telescopic rods 13 are respectively provided with a limiting groove 132 extending along the respective length directions, and the surfaces of the semicircular block parts 151 of the two positioning blocks 15, which are oppositely abutted with the ends of the corresponding telescopic rods 13, are respectively provided with limiting protrusions 153 in sliding fit with the corresponding limiting grooves 132, so that the two telescopic rods 13 can only move along the axial direction of the grab handle and cannot rotate circumferentially.

In this embodiment, the two dumbbell heads 12 each include a limiting disc 121 that is sleeved outside the corresponding end of the grab handle 11 in a gap, the outer side of the limiting disc 121 is fixedly connected with a dumbbell piece 122 through a screw, a first central hole 1221 through which the corresponding telescopic rod 13 passes is arranged in the center of the dumbbell piece 122, a gear disc 111 is fixedly sleeved at the left end and the right end of the grab handle 11, and the gear disc 111 is located inside the limiting disc 121 and rotatably connected with the inner side of the limiting disc 121. And, for aesthetic and anti-slip, a grip cover 17 is fixedly sleeved on the outer part of the grab handle 11.

Preferably, the fixing portion 152 and the fixing groove 120 are designed to be in a semicircular structure which is matched with each other, and in order to facilitate the installation of the fixing portion 152, the fixing groove 120 is concavely formed on the side of the dumbbell piece 122 facing the limiting disc 121, so that when the dumbbell piece 122 and the limiting disc 121 are fixed together by screws after the dumbbell piece is inserted into the fixing groove 120 during the installation, the circumference of the fixing portion 152 is limited and fixed by two end walls of the circumference of the fixing groove 120 after the installation, and the axial direction of the fixing portion 152 is limited and fixed by the bottom wall of the fixing groove 120 and the side surface of the limiting disc 121 facing the dumbbell piece 122.

Further, a plurality of round holes 112 are respectively formed in the peripheral walls of the left and right ends of the grab handle 11 at intervals along the circumferential direction, the balls 14 at the two ends of the grab handle 11 are movably embedded in the corresponding round holes 112, the centers of the two limiting plates 121 are respectively provided with a central sleeve hole 1210, the two limiting plates 121 are respectively sleeved at the two ends of the grab handle 11 through the central sleeve holes 1210 in a clearance manner, and the balls 14 at the two ends of the grab handle 11 are sleeved in the central sleeve holes 1210, so that the outer sides of the balls 14 are stopped by the wall of the corresponding central sleeve holes 1210 and cannot fall out.

In this embodiment, a plurality of gear slots 161 are disposed on the gear disc 111 and distributed at intervals along the circumferential direction, a radially movable limiting block 162 and a spring 163 disposed inside the limiting block 162 for maintaining the radially outward movement trend of the limiting block 162 are disposed on the limiting disc 121, and when no external force acts, the limiting block 162 is clamped into one of the gear slots 161 under the action of the spring 163 to make the gear disc 111 in a locking state, so that the grab handle 11 cannot perform rotation adjustment operation at this time.

As described above, the dumbbell further comprises a receiving seat 3, the receiving seat 3 has two supporting positions 32 disposed at left and right intervals and two receiving areas 33 respectively located at outer sides of the two supporting positions 32, wherein the two supporting positions 32 are used for respectively supporting the two limiting plates 121 of the dumbbell body 1, and the two receiving areas 33 are used for respectively receiving the two sets of weight plates 2.

Further, the stopper 162 is disposed at the lower end of the limiting disc 121, the two supporting positions 32 are respectively provided with a propping member 31, when the dumbbell body 1 is placed on the two supporting positions 32 through the two limiting discs 121, the stopper 162 is propped against the propping member 31 to separate from the gear groove 161, so that the gear disc 111 is in an unlocking state, at this time, the grab handle 11 can be rotated and adjusted, and the gear disc 111 can be extended out to be respectively connected with a weight piece or retracted to be respectively separated from the weight piece along with each rotation of the grab handle 11. In addition, the propping piece 31 is located outside the horizontal projection of the gear groove 161, so that when the limiting block 162 is propped out of the gear groove 161 by the propping piece 31, the propping piece 31 cannot enter the gear groove 161 to interfere with the gear disc 111.

Furthermore, the gear disc 111 is further provided with limiting holes 1111 which are circumferentially spaced and have the same number as the gear grooves 161, the limiting disc 121 is provided with a limiting marble 1211, and the limiting marble 1211 can be clamped into any one of the limiting holes 1111 corresponding to the gear positions along with the rotation of the gear disc 111, in other words, when the gear disc 111 rotates to a desired gear position, the limiting marble 1211 is just clamped into the limiting hole 1111 corresponding to the gear position, thereby assisting in limiting.

Still further, a gear identification block 1112 is disposed between two adjacent gear slots 161, a gear display window 1212 is disposed on the limiting disc 121, and when the gear disc 111 rotates to a desired gear, the gear identification block 1112 corresponding to the gear is opposite to the gear display window 1212 and displayed outwards, so that a user can conveniently know the number of weight plates on two sides of the dumbbell body 1 by observing the gear identification blocks 1112.

As described above, the upper end of the outer surface of the dumbbell piece 122 is provided with a first clamping block 1222 having a dovetail shape in cross section, and the lower end of the outer surface of the dumbbell piece 122 is provided with a first clamping groove 1223 having a dovetail shape in cross section. The two groups of weight plates 2 comprise a plurality of weight plates; the center of each weight plate 2 is provided with a second center hole 21 for the corresponding telescopic rod 13 to be sleeved; the upper end of one side surface of each weight plate 2 facing the dumbbell body 1 is provided with a second clamping groove 22 with a big upper part and a small lower part and a dovetail-shaped cross section, and the lower end of one side surface of each weight plate 2 facing the dumbbell body 1 is provided with a second clamping block 23 with a big upper part and a big lower part and a dovetail-shaped cross section; meanwhile, except for the last-stage weight piece, the upper end of one side surface of each weight piece 2, which is back to the dumbbell body 1, is provided with a third clamping block 24 with a large upper part and a small lower part and a dovetail-shaped cross section, and the lower end of one side surface of each weight piece 2, which is back to the dumbbell body 1, is provided with a third clamping groove 25 with a small upper part and a large lower part and a dovetail-shaped cross section. In each group of weight plates 2, the first-stage weight plate 2 can be respectively clamped with the first clamping block 1222 and the first clamping block 1223 corresponding to the outer side surface of the dumbbell plate 122 through the second clamping groove 22 and the second clamping block 23, and the next-stage weight plate 2 can be respectively clamped with the third clamping block 24 and the third clamping groove 25 of the previous-stage weight plate 2 through the second clamping groove 22 and the second clamping block 23. In the structure, the dovetail design of each clamping block and each clamping groove ensures that the weight piece cannot axially fall off when being clamped on the dumbbell piece or the upper-stage weight piece.

In addition, in each group of weight plates 2, the lower end of the surface of the side of the last-stage weight plate 2, which is opposite to the dumbbell body 1, is provided with a fourth clamping groove 26 with a small upper part and a large lower part, the cross section of the fourth clamping groove is in a dovetail shape, and two storage areas 33 on two sides of the storage seat 3 are respectively provided with a limiting block 331 which is clamped with the fourth clamping groove 26 of the last-stage weight plate 2, so that the weight plates are stably placed on the storage seat.

The foregoing description is only illustrative of the preferred embodiments of the present utility model and is not intended to limit the scope of the utility model, i.e., the utility model is not limited to the specific embodiments described herein, but is to be accorded the full scope of the claims.

Claims (10)

1. The dumbbell comprises a dumbbell body and two groups of weight plates, wherein the dumbbell body comprises a grab handle and two dumbbell heads arranged at the left end and the right end of the grab handle; the method is characterized in that:

two telescopic rods which are approximately semicircular in shaft shape are movably arranged in the grab handle in a penetrating mode, the two telescopic rods are attached in opposite directions and are staggered at certain positions, a plurality of spiral grooves which are distributed at intervals along the axial direction are formed in the outer circle surfaces of the two telescopic rods, and the spiral directions of the spiral grooves on the outer circle surfaces of the two telescopic rods are opposite;

the left end and the right end of the grab handle are respectively provided with a plurality of balls distributed at intervals along the circumferential direction, the interiors of the left end and the right end of the grab handle are respectively provided with a positioning block, the positioning blocks are provided with positioning grooves, one end of each positioning block is exposed out of the grab handle and fixed on the corresponding dumbbell head, one part of balls at each end of the grab handle fall into the positioning grooves, and the other part of balls are positioned outside the positioning grooves and are matched with the spiral grooves on the outer circle surfaces of the corresponding telescopic rods;

the grab handle can rotate relative to the two dumbbell heads, and along with the rotation of the grab handle, balls at each end of the grab handle are mutually switched between the positioning groove and each spiral groove on the outer circle surface of the telescopic rod, so that the two telescopic rods are driven to axially extend or retract along the grab handle;

the two sets of weight plates are used for being connected to the two telescopic rods when the two telescopic rods extend or being separated from the two telescopic rods when the two telescopic rods retract.

2. A dumbbell for facilitating weight adjustment according to claim 1, wherein: the positioning block comprises a semicircular block body which is positioned in the grab handle and is attached to the end part of the corresponding telescopic rod in the opposite direction, the positioning groove is an arc-shaped groove penetrating through the outer circle surface of the semicircular block body in the circumferential direction, the positioning block further comprises a fixing part which is exposed out of the grab handle, and the dumbbell head is provided with a fixing groove for embedding and fixing the fixing part.

3. A dumbbell for facilitating adjustment of weights according to claim 2, wherein: the opposite joint surfaces of the two telescopic rods are respectively provided with a limiting groove extending along the respective length direction, and the surfaces of the semicircular block parts of the two positioning blocks, which are oppositely jointed with the corresponding telescopic rod ends, are respectively provided with limiting convex blocks which are in sliding fit with the corresponding limiting grooves.

4. A dumbbell for facilitating weight adjustment according to claim 1, wherein: the two dumbbell heads comprise limiting discs sleeved outside the corresponding end parts of the grab handles in a gap mode, dumbbell sheets are fixedly connected to the outer sides of the limiting discs, first center holes for corresponding telescopic rods to penetrate through are formed in the centers of the dumbbell sheets, a gear disc is fixedly sleeved at the left end and the right end of each grab handle respectively, and the gear disc is located on the inner sides of the limiting discs and rotatably connected with the inner sides of the limiting discs.

5. The dumbbell facilitating adjustment of weights of claim 4, wherein: the gear disc is provided with a plurality of gear grooves distributed at intervals along the circumferential direction, the limiting disc is provided with a limiting block capable of moving radially and a spring which is positioned at the inner side of the limiting block and used for enabling the limiting block to keep the radial outward movement trend, and when no external force acts, the limiting block is clamped into one of the gear grooves under the action of the spring, so that the gear disc is in a locking state.

6. The dumbbell facilitating adjustment of weights of claim 5, wherein: still include a receiver, the receiver has about two bearing positions that the interval set up and is located two storage areas in two bearing positions outsides respectively, wherein, two bearing positions are used for the bearing respectively two spacing plates of dumbbell body, two storage areas are used for accomodating two sets of counter weight pieces respectively.

7. The dumbbell facilitating adjustment of weights of claim 6, wherein: the limiting block is arranged at the lower end of the limiting disc, the two supporting positions are respectively provided with a propping piece, when the dumbbell body is placed on the two supporting positions through the two limiting discs, the limiting block is propped by the propping pieces to be separated from the gear groove, and the propping pieces are positioned outside the horizontal projection of the gear groove.

8. The dumbbell facilitating adjustment of weights of claim 5, wherein: the gear disc is also provided with limiting holes which are distributed at intervals along the circumferential direction and have the same number as the gear grooves, the limiting disc is provided with a limiting marble, and the limiting marble can be clamped into any one of the limiting holes at the corresponding position along with the rotation of the gear disc.

9. The dumbbell facilitating weight adjustment of claim 8, wherein: a gear identification block is arranged between two adjacent gear grooves, a gear display window is arranged on the limiting disc, and when the gear disc rotates to a required gear, the gear identification block corresponding to the gear is opposite to the gear display window and is displayed outwards.

10. The dumbbell facilitating adjustment of weights of claim 4, wherein: the upper end of the outer side surface of the dumbbell piece is provided with a first clamping block with a large upper part and a small lower part and a dovetail-shaped cross section, and the lower end of the outer side surface of the dumbbell piece is provided with a first clamping groove with a small upper part and a large lower part and a dovetail-shaped cross section; the two groups of weight plates all comprise a plurality of weight plates, the center of each weight plate is provided with a second center hole for the corresponding telescopic rod to pass through, the upper end of one side surface of each weight plate facing the dumbbell body is provided with a second clamping groove with a big top and a small bottom and a dovetail cross section, the lower end of one side surface of each weight plate facing the dumbbell body is provided with a second clamping block with a big top and a big bottom and a dovetail cross section, meanwhile, except for the weight plate of the last stage, the upper end of one side surface of each weight plate facing away from the dumbbell body is provided with a third clamping block with a big top and a small bottom and a dovetail cross section, and the lower end of one side surface of each weight plate facing away from the dumbbell body is provided with a third clamping groove with a big top and a big bottom and a dovetail cross section; in the two groups of weight plates, the first-stage weight plate can be clamped with the first clamping block and the first clamping groove corresponding to the outer side surface of the dumbbell piece through the second clamping groove and the second clamping block, and the next-stage weight plate can be clamped with the third clamping block and the third clamping groove of the previous-stage weight plate through the second clamping groove and the second clamping block.

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