CN215505327U

CN215505327U - Dumbbell

Info

Publication number: CN215505327U
Application number: CN202120212092.5U
Authority: CN
Inventors: 赵利强
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-01-26
Filing date: 2021-01-26
Publication date: 2022-01-14
Anticipated expiration: 2031-01-26
Also published as: WO2022161509A1

Abstract

The utility model discloses a dumbbell, which comprises a handle and two groups of counterweight mechanisms, wherein the handle comprises a middle pipe, two telescopic rods in sliding fit with the middle pipe and a linear driving mechanism arranged on the middle pipe, and the linear driving mechanism is used for controlling the two telescopic rods to approach to or depart from each other; the two groups of weight balancing mechanisms are symmetrically distributed at two ends of the middle tube, each weight balancing mechanism comprises a plurality of dumbbell pieces coaxial with the telescopic rod, a buckle assembly is arranged between every two adjacent dumbbell pieces and used for preventing the two adjacent dumbbell pieces from axially moving relatively, and when the telescopic rod is controlled by the linear driving mechanism to extend into the assembling holes of one or more dumbbell pieces, the corresponding number of dumbbell pieces are assembled at two ends of the middle tube through the telescopic rod; has the advantages of adjustable weight and convenient use.

Description

Dumbbell

Technical Field

The utility model belongs to the technical field of fitness equipment, and particularly relates to a dumbbell.

Background

A dumbbell, named Dumbbell in English, is an auxiliary device for body-building exercises and mainly comprises a holding rod and a dumbbell sheet. The traditional dumbbells are divided into two types, one type is that a holding rod and a dumbbell sheet are integrally formed, the weight of the traditional dumbbell is not adjustable, and a plurality of sets of dumbbells with different weights are correspondingly purchased along with the gradual increase of the demand of a user on strength, so that the cost is high and the occupied space is large; the other type is that the holding rod and the dumbbell pieces are detachably connected through bolts, corresponding quantity of dumbbell pieces are configured at two ends of the holding rod according to actual requirements, the bolts need to be detached when the weight is adjusted each time, then the quantity of the dumbbell pieces is adjusted, and finally the dumbbell pieces are locked through the bolts, so that operation is troublesome.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a dumbbell with adjustable weight, which is convenient to use.

The technical scheme adopted by the utility model for solving the technical problems is as follows: a dumbbell comprises a handle and two groups of counterweight mechanisms, wherein the handle comprises a middle pipe, two telescopic rods in sliding fit with the middle pipe and a linear driving mechanism arranged on the middle pipe, and the linear driving mechanism is used for controlling the two telescopic rods to be close to or far away from each other; the two groups of weight balancing mechanisms are symmetrically distributed at two ends of the middle tube, each weight balancing mechanism comprises a plurality of dumbbell pieces coaxial with the telescopic rod, a buckle assembly is arranged between every two adjacent dumbbell pieces and used for preventing the two adjacent dumbbell pieces from moving axially relative to each other, and when the telescopic rod is controlled by the linear driving mechanism to extend into one or more assembling holes of the dumbbell pieces, the corresponding number of dumbbell pieces are assembled at two ends of the middle tube through the telescopic rod.

Preferably, the outer side walls of the two telescopic rods are respectively provided with tooth parts extending along the axial direction, the side wall of the middle tube is provided with two openings corresponding to the two tooth parts one by one, the linear driving mechanism comprises a sleeve sleeved outside the middle tube, two ends of the sleeve are respectively provided with a rotating seat, a connecting seat and a locking part, the rotating seat is provided with a first central hole and an inner gear ring, the connecting seat is provided with a second central hole, a shaft hole, a transmission shaft rotationally matched with the shaft hole, a first gear and a second gear, the dumbbell piece closest to the middle tube of each group of counterweight mechanisms is defined as an inner dumbbell piece, the end part of the middle tube sequentially penetrates through the first central hole and the second central hole and then extends into an assembly hole of the inner dumbbell piece, and the rotating seat is sleeved on the middle tube and rotationally matched with the middle tube, the middle tube is fixedly connected with the inner dumbbell piece through the connecting seat, the first gear is fixedly arranged on the transmission shaft and is in meshed connection with the inner gear ring, the second gear is fixedly arranged on the transmission shaft and extends into the opening to be in meshed connection with the tooth part, the locking piece is arranged between the connecting seat and the rotating seat and is used for limiting the rotating seat to rotate, when the locking piece is unlocked, the sleeve is rotated to enable the two rotating seats to synchronously rotate, the rotating seat drives the inner gear ring, the first gear, the transmission shaft and the second gear to rotate, and the second gear pushes the telescopic rod to move along the axis through the tooth part.

Preferably, two cross rods extending along the radial direction and four through holes for the cross rods to penetrate through are arranged in the middle pipe, the cross rods divide the interior of the middle pipe into two linear channels, the two telescopic rods correspond to the two linear channels one to one, a jack communicated with the through holes is arranged on the inner side wall of the second center hole, and the end portion of each cross rod penetrates through the through hole and then is inserted into the jack.

Preferably, a shifting block in a regular polygon shape, a first ring and a counterweight plate which are coaxial with the inner dumbbell plate are arranged between the connecting seat and the inner dumbbell plate, the shifting block is fixedly arranged on the transmission shaft and is positioned on the inner side of the first ring, one end of the first ring is fixedly connected with the inner dumbbell plate, a first perforation, a push rod and a first compression spring are arranged on the side surface of the first ring, the push rod is in sliding fit with the first perforation, the push rod is elastically connected with the first ring through the first compression spring, one end of the push rod is abutted against the shifting block, the upper end surface of the counterweight plate is recessed downwards to form a first groove matched with the lower half part of the first ring, a second perforation communicated with the first perforation is arranged on the inner side wall of the first groove, and in the process that the shifting block rotates along with the transmission shaft, when the vertex angle of the shifting block is contacted with one end of the push rod, the push rod moves along the radial outer direction, the other end of the push rod is inserted into the second through hole, the first compression spring is compressed, the counterweight plate is assembled to the end part of the middle pipe through the push rod, when the vertex angle of the shifting block is separated from one end of the push rod, the first compression spring returns, the push rod moves along the radial inner direction, the other end of the push rod extends out of the second through hole, and the counterweight plate is separated from the end part of the middle pipe.

Preferably, a first sleeve coaxial with the intermediate pipe is arranged on one side, close to the connecting seat, of the rotating seat, the inner gear ring is fixedly arranged on the inner side wall of the first sleeve, a plurality of positioning notches distributed along the circumferential direction are formed in the top end of the first sleeve, a second sleeve sleeved on the outer side of the first sleeve is arranged on one side, close to the rotating seat, of the connecting seat, a lock hole is formed in the side wall of the second sleeve, the locking piece comprises an installation seat fixedly arranged in the second sleeve and a locking block matched with the lock hole, a sliding groove extending in the radial direction of the second sleeve, a sliding block in sliding fit with the sliding groove and a second compression spring are arranged on the installation seat, the second compression spring is located between the groove bottom of the sliding groove and one end of the sliding block, and the locking block is fixedly arranged at the other end of the sliding block, when the second compression spring ejects the other end of the sliding block out of the sliding groove, the sliding block is in clamping fit with one positioning notch, and the locking block is inserted into the locking hole.

Preferably, a coaxial second circular ring is fixedly arranged in the first sleeve, one end, close to the connecting seat, of the second circular ring is provided with a plurality of positioning grooves, the number of the positioning grooves is equal to that of the positioning notches, all the positioning grooves are distributed in the circumferential direction and correspond to all the positioning notches one to one, a first guide column extending into the second sleeve is arranged on the connecting seat, a first counter bore, a third compression spring and a ball are arranged on the first guide column, one end of the third compression spring is in contact with the inner bottom surface of the first counter bore, and the other end of the third compression spring is connected with the ball and presses the ball into one positioning groove.

Preferably, the counterweight mechanism further comprises a support for placing the two groups of counterweight mechanisms, the lock hole is located on one side right below the second sleeve, two pushing convex blocks are arranged on the support and located right below the lock hole, when the counterweight mechanism is placed on the support, the pushing convex blocks are inserted into the second sleeve through the lock hole, the lock block is separated from the lock hole in the process, and the sliding block is separated from the positioning notch.

Preferably, the support comprises a base, two baffles and two connecting rods, one end of each connecting rod is fixedly connected with one baffle, the other end of each connecting rod penetrates through the base and is fixedly connected with the other baffle, the base, the baffles and the two connecting rods form a placing groove matched with the counterweight mechanism, the pushing lugs are fixedly arranged on the base, and the lower end of the connecting seat abuts against the base and enables the pushing lugs to be inserted into the locking holes.

Preferably, the upper end of the dumbbell sheet is provided with an upper mounting groove, the lower end of the dumbbell sheet is provided with a lower mounting groove, the buckle assembly comprises an upper connecting plate detachably connected with the upper mounting groove and a lower connecting plate detachably connected with the lower mounting groove, one side of the upper connecting plate, which is far away from the intermediate tube, is provided with a first limiting block, one side of the upper connecting plate, which is close to the intermediate tube, is provided with a first limiting groove in up-and-down sliding fit with the first limiting block, and the upper end of the first limiting groove penetrates through the upper end face of the upper connecting plate; one side of the lower connecting plate, which is close to the middle pipe, is provided with a second limiting block, one side of the lower connecting plate, which is far away from the middle pipe, is provided with a second limiting groove which is in vertical sliding fit with the second limiting block, and the lower end of the second limiting groove penetrates through the lower end face of the lower connecting plate.

Preferably, a first connecting block is arranged at the bottom of the upper mounting groove, a first pin hole is formed in the first connecting block, a second groove matched with the first connecting block in a clamping mode is formed in the lower end of the upper connecting plate, a second pin hole communicated with the second groove is formed in the side wall of the upper connecting plate, and a pin penetrates through the second pin hole and the first pin hole to fix the upper connecting plate to the dumbbell piece; the dumbbell piece is characterized in that a second connecting block is arranged at the bottom of the lower mounting groove, a third pin hole is formed in the second connecting block, a third groove matched with the second connecting block in a clamping mode is formed in the lower end of the lower connecting plate, a fourth pin hole communicated with the third groove is formed in the side wall of the lower connecting plate, and a pin penetrates through the fourth pin hole and the third pin hole to fix the lower connecting plate to the dumbbell piece.

Compared with the prior art, the utility model has the advantages that

1. The linear driving mechanism is used for controlling the two telescopic rods to be close to or far away from each other so as to synchronously adjust the lengths of the two telescopic rods extending out of the middle tube, so that the lengths of the telescopic rods extending into the dumbbell piece assembling holes are changed, the number of dumbbell pieces assembled at two ends of the middle tube is adjusted, two adjacent dumbbell pieces are prevented from axially moving relative to each other through the buckle assembly, when a user upwards takes up the dumbbell through a handle, the dumbbell pieces inserted with the telescopic rods are limited at two ends of the middle tube, the dumbbell pieces not inserted with the telescopic rods are separated from the dumbbell pieces inserted with the telescopic rods, the purpose of adjusting the weight of the whole dumbbell is achieved, and the adjusting process has no fussy dismounting action and is convenient to use;

2. the inner gear ring, the first gear, the transmission shaft, the second gear and the tooth part on the telescopic rod on the rotating seat form a linkage structure, and the rotation can be converted into linear motion, namely, the rotating seat is rotated to enable the telescopic rod to move along the axis so as to adjust the extending length of the telescopic rod, so that the operation is simple and the stability is good;

3. the shifting block, the first ring and the balance weight piece are arranged between the connecting seat and the inner dumbbell piece, and the balance weight piece can be assembled on the end part of the middle pipe or separated from the end part of the middle pipe in the process that the shifting block rotates along with the transmission shaft, so that the weights at two ends of the middle pipe are finely adjusted, the adjustable range of the weights is expanded, and the applicability is better;

4. the two adjacent dumbbell pieces are connected and matched through the first limiting block, the first limiting groove, the second limiting block and the second limiting groove, the dumbbell pieces can only move upwards to be separated from the adjacent dumbbell pieces, the structure is matched with the telescopic rod for use, and the number of the dumbbell pieces at the two ends of the middle pipe can be simply and conveniently adjusted.

Drawings

FIG. 1 is a first schematic structural diagram of the present invention;

FIG. 2 is a schematic view of a partial cross-sectional structure of the present invention;

FIG. 3 is a schematic structural view of the telescopic rod of the present invention;

FIG. 4 is a first partial schematic view of the present invention;

FIG. 5 is a schematic illustration of a partial explosion configuration of the present invention;

FIG. 6 is a second partial schematic view of the present invention;

FIG. 7 is a first schematic structural view of the connecting socket of the present invention;

FIG. 8 is a second schematic structural view of the connecting socket of the present invention;

FIG. 9 is a schematic cross-sectional view of the location between the connecting seat and the inner dumbbell piece of the present invention;

FIG. 10 is an enlarged schematic view at A of FIG. 9;

FIG. 11 is a first schematic structural view of the locking element of the present invention;

FIG. 12 is a second structural view of the locking member of the present invention;

FIG. 13 is a second schematic structural view of the present invention;

FIG. 14 is a schematic view of the structure of the stand of the present invention;

FIG. 15 is a first schematic diagram of an exploded configuration of a dumbbell sheet in accordance with the present invention;

fig. 16 is a second schematic diagram of the explosion structure of the dumbbell sheet in the utility model.

In the figure: 1. a grip; 11. an intermediate pipe; 111. an opening; 112. a cross bar; 113. a through hole; 12. a telescopic rod; 121. a tooth portion; 13. a linear drive mechanism; 131. a sleeve; 1311. a card slot; 132. a rotating seat; 1321. a first central aperture; 1322. an inner gear ring; 1323. a third sleeve; 1324. a lug; 1325. a first sleeve; 1326. positioning the notch; 1327. a second circular ring; 1328. positioning a groove; 133. a connecting seat; 1331. a second central aperture; 1332. a shaft hole; 1333. a drive shaft; 1334. a first gear; 1335. a second gear; 1336. a jack; 1337. a second sleeve; 1338. a lock hole; 13391. a first guide post; 13392. a first counterbore; 13393. a third compression spring; 13394. a ball bearing; 134. a locking member; 1341. a mounting seat; 1342. a locking block; 1343. a chute; 1344. a slider; 1345. a second compression spring; 1346. a second guide post; 1347. a second counterbore; 2. a counterweight mechanism; 21. a dumbbell sheet; 211. mounting a mounting groove; 212. a lower mounting groove; 213. a first connection block; 2131. a first pin hole; 214. a second connecting block; 2141. a third pin hole; 22. a buckle assembly; 221. an upper connecting plate; 2211. a first stopper; 2212. a first limit groove; 2213. a second groove; 2214. a second pin hole; 222. a lower connecting plate; 2221. a second limiting block; 2222. a second limit groove; 2223. a third groove; 2224. a fourth pin hole; 31. shifting blocks; 32. a first circular ring; 321. a first perforation; 322. a push rod; 323. a first compression spring; 33. a weight plate; 331. a first groove; 332. a second perforation; 4. a support; 41. a base; 411. pushing the bump; 42. a baffle plate; 421. a third limiting block; 43. a connecting rod.

Detailed Description

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

The first embodiment is as follows: as shown in the figures, the dumbbell comprises a handle 1 and two groups of weight balancing mechanisms 2, wherein the handle 1 comprises a middle pipe 11, two telescopic rods 12 in sliding fit with the middle pipe 11 and a linear driving mechanism 13 arranged on the middle pipe 11, and the linear driving mechanism 13 is used for controlling the two telescopic rods 12 to approach to or depart from each other; two sets of counter weight mechanisms 2 symmetric distribution are at the both ends of well tube 11, counter weight mechanism 2 includes a plurality of dumbbell piece 21 coaxial with telescopic link 12, be provided with buckle subassembly 22 between two adjacent dumbbell piece 21, buckle subassembly 22 is used for preventing to take place axial relative movement between two adjacent dumbbell piece 21, when stretching into the mounting hole of one or more dumbbell piece 21 through sharp actuating mechanism 13 control telescopic link 12, the both ends of well tube 11 are assembled through telescopic link 12 to the dumbbell piece 21 of corresponding quantity.

Example two: the rest of the embodiment is the same as the first embodiment, and the difference is that the outer side walls of the two telescopic rods 12 are respectively provided with a tooth portion 121 extending along the axial direction, the side wall of the middle tube 11 is provided with two openings 111 corresponding to the two tooth portions 121 one by one, the linear driving mechanism 13 comprises a sleeve 131 sleeved outside the middle tube 11, two ends of the sleeve 131 are respectively provided with a rotating seat 132, a connecting seat 133 and a locking piece 134, the rotating seat 132 is provided with a first central hole 1321 and an inner gear ring 1322, the connecting seat 133 is provided with a second central hole 1331, a shaft hole 1332, a transmission shaft 1333 rotationally matched with the shaft hole 1332, a first gear 1334 and a second gear 1335, the dumbbell sheet 21 closest to the middle tube 11 of each group of weight balancing mechanisms is defined as an inner dumbbell sheet, the end portion of the middle tube 11 sequentially passes through the first central hole 1321 and the second central hole 1331 and then extends into the assembly hole of the inner dumbbell sheet, the rotating seat 132 is sleeved on the middle tube 11 and rotationally matched with the middle tube 11, the middle tube 11 is fixedly connected with the inner dumbbell piece through the connecting seat 133, the first gear 1334 is fixedly arranged on the transmission shaft 1333 and is engaged with the ring gear 1322, the second gear 1335 is fixedly arranged on the transmission shaft 1333, the second gear 1335 extends into the opening 111 and is engaged with the tooth part 121, the locking part 134 is arranged between the connecting seat 133 and the rotating seat 132 and is used for limiting the rotation of the rotating seat 132, when the locking part 134 is unlocked, the rotating sleeve 131 enables the two rotating seats 132 to synchronously rotate, the rotating seat 132 drives the ring gear 1322, the first gear 1334, the transmission shaft 1333 and the second gear 1335 to rotate, the second gear 1335 pushes the telescopic rod 12 to move along the axis through the tooth part 121, wherein one side of the rotating seat 132, which is far away from the connecting seat 133, is provided with a third sleeve 1323 which is sleeved on the outer side wall of the middle tube 11, the outer side wall of the third sleeve 1323 is provided with a lug 1324, and two ends of the sleeve 131 are respectively provided with a clamping groove 1311, and the two ends of the sleeve 131 are respectively sleeved on the outer side wall of the third sleeve 1323, and the lugs 1324 are in clamping fit with the clamping grooves 1311.

In this embodiment, two cross bars 112 extending along the radial direction and four through holes 113 for the cross bars 112 to penetrate through are arranged in the middle tube 11, the cross bars 112 divide the interior of the middle tube 11 into two linear channels, the two telescopic bars 12 correspond to the two linear channels one by one, an insertion hole 1336 communicated with the through holes 113 is arranged on the inner side wall of the second central hole 1331, the end portion of the cross bar 112 penetrates through the through hole 113 and then is inserted into the insertion hole 1336, and the cross bar 112 plays a role in limiting and guiding.

In this embodiment, a dial block 31 in a regular polygon shape, a first ring 32 and a weight plate 33 coaxial with the inner dumbbell piece are arranged between the connecting seat 133 and the inner dumbbell piece, the dial block 31 is fixedly arranged on the transmission shaft 1333 and located inside the first ring 32, one end of the first ring 32 is fixedly connected with the inner dumbbell piece, a first through hole 321, a push rod 322 and a first compression spring 323 are arranged on the side surface of the first ring 32, the push rod 322 is in sliding fit with the first through hole 321, the push rod 322 is elastically connected with the first ring 32 through the first compression spring 323, one end of the push rod 322 abuts against the dial block 31, the upper end surface of the weight plate 33 is recessed downwards to form a first groove 331 matched with the first ring 32, a second through hole 332 communicated with the first through hole 321 is arranged on the inner side wall of the first groove 331, when the dial block 31 rotates along with the transmission shaft 1333, when the lower half portion of the dial block 31 is in contact with one end of the push rod 322, the push rod 322 moves in a radial outward direction, the other end of the push rod 322 is inserted into the second through hole 332, the first compression spring 323 is compressed, the weight plate 33 is assembled to the end of the middle tube 11 through the push rod 322, when the top corner of the dial 31 is separated from the one end of the push rod 322, the first compression spring 323 is restored, the push rod 322 moves in a radial inward direction, the other end of the push rod 322 protrudes from the second through hole 332, and the weight plate 33 is separated from the end of the middle tube 11.

Example two: the rest of the embodiment is the same as the first embodiment, except that a first sleeve 1325 coaxial with the middle tube 11 is disposed on one side of the rotating seat 132 close to the connecting seat 133, the annular gear 1322 is fixedly disposed on an inner sidewall of the first sleeve 1325, a plurality of positioning notches 1326 distributed along the circumferential direction are disposed at a top end of the first sleeve 1325, a second sleeve 1337 sleeved outside the first sleeve 1325 is disposed on one side of the connecting seat 133 close to the rotating seat 132, a locking hole 1338 is disposed on a sidewall of the second sleeve 1337, the locking member 134 includes a mounting seat 1341 fixedly disposed in the second sleeve 1337 and a locking block 1342 adapted to the locking hole 1338, a sliding groove 1343 extending along the radial direction of the second sleeve 1337, a sliding block 1344 slidably engaged with the sliding groove 1343 and a second compression spring 1345 are disposed on the mounting seat 1341, the second compression spring 1345 is disposed between a groove bottom of the sliding groove 1343 and one end of the sliding block 1344, the locking block 1342 is fixedly disposed on the other end of the sliding block 1344, when the second compression spring 1345 pushes the other end of the slider 1344 out of the chute 1343, the slider 1344 is in clamping fit with one positioning notch 1326, and the lock piece 1342 is inserted into the lock hole 1338, wherein the positioning notches 1326 are distributed at equal intervals along the circumferential direction, a second guide post 1346 is arranged at the bottom of the chute 1343, a second counter bore 1347 with an opening 111 facing the second guide post 1346 is arranged on the slider 1344, the second compression spring 1345 is sleeved on the second guide post 1346, and one end of the second compression spring 1345 extends into the second counter bore 1347.

In this embodiment, a second coaxial ring 1327 is fixedly disposed in the first sleeve 1325, a plurality of positioning slots 1328 equal in number to the positioning notches 1326 are disposed at one end of the second ring 1327 close to the connecting seat 133, all the positioning slots 1328 are distributed in the circumferential direction and correspond to all the positioning notches 1326 one by one, a first guiding column 13391 extending into the second sleeve 1337 is disposed on the connecting seat 133, a first counter bore 13392, a third compression spring 13393 and a ball 13394 are disposed on the first guiding column 13391, one end of the third compression spring 13393 contacts with the inner bottom surface of the first counter bore 13392, the other end of the third compression spring 13393 is connected with the ball 13394 and presses the ball 13394 into one positioning slot 1328, wherein the plurality of positioning slots 1328 are distributed at equal intervals in the circumferential direction, and by disposing the second ring 1327 and the ball 13394, the ball 13394 jumps among the plurality of positioning slots 1328 during the rotation of the rotating seat 132, the user can conveniently confirm whether the rotation is in place, and the use is more convenient.

Example three: the rest of the dumbbell is the same as the embodiment, but the dumbbell further comprises a support 4 for placing two groups of weight mechanisms 2, a lock hole 1338 is located on one side right below a second sleeve 1337, two pushing convex blocks 411 are arranged on the support 4, the pushing convex blocks 411 are located right below the lock hole 1338, when the weight mechanisms 2 are placed on the support 4, the pushing convex blocks 411 are inserted into the second sleeve 1337 through the lock hole 1338, in the process, the lock block 1342 is separated from the lock hole 1338, and the sliding block 1344 is separated from the positioning notch 1326.

In this embodiment, the support 4 includes a base 41, two baffles 42 and two connecting rods 43, one end of the connecting rod 43 is fixedly connected to one baffle 42, the other end of the connecting rod 43 passes through the base 41 and is fixedly connected to the other baffle 42, the base 41, the baffles 42 and the two connecting rods 43 form a placing slot adapted to the counterweight mechanism 2, the pushing protrusion 411 is fixedly disposed on the base 41, and the lower end of the connecting seat 133 abuts against the base 41 and the pushing protrusion 411 is inserted into the locking hole 1338.

In this embodiment, a third limiting block 421 is disposed on one side of the baffle 42 close to the base 41, a third limiting groove (not shown in the figure) in clamping fit with the third limiting block 421 is disposed on the lower end surface of the dumbbell sheet 21 closest to the baffle 42, and when part of the dumbbell sheet 21 is assembled to both ends of the middle tube 11 and separated from the placing groove, the baffle 42 limits the position of the dumbbell sheet 21 closest to the baffle 42 through the third limiting block 421 and the third limiting groove, so as to prevent the dumbbell sheet 21 from tilting or tipping.

Example four: the rest of the structure is the same as that of the first embodiment, and the structure is different in that an upper mounting groove 211 is formed in the upper end of the dumbbell sheet 21, a lower mounting groove 212 is formed in the lower end of the dumbbell sheet 21, the buckle assembly 22 comprises an upper connecting plate 221 detachably connected with the upper mounting groove 211 and a lower connecting plate 222 detachably connected with the lower mounting groove 212, a first limiting block 2211 is arranged on one side, away from the middle tube 11, of the upper connecting plate 221, a first limiting groove 2212 in up-and-down sliding fit with the first limiting block 2211 is arranged on one side, close to the middle tube 11, of the upper connecting plate 221, and the upper end of the first limiting groove 2212 penetrates through the upper end face of the upper connecting plate 221; a second stop block 2221 is arranged on one side of the lower connecting plate 222 close to the middle tube 11, a second stop groove 2222 in up-and-down sliding fit with the second stop block 2221 is arranged on one side of the lower connecting plate 222 far from the middle tube 11, and the lower end of the second stop groove 2222 penetrates through the lower end face of the lower connecting plate 222.

In this embodiment, a first connecting block 213 is disposed at the bottom of the upper mounting groove 211, a first pin hole 2131 is disposed on the first connecting block 213, a second groove 2213 snap-fitted with the first connecting block 213 is disposed at the lower end of the upper connecting plate 221, a second pin hole 2214 communicated with the second groove 2213 is disposed on the side wall of the upper connecting plate 221, and the upper connecting plate 221 is fixed to the dumbbell sheet 21 after the pin passes through the second pin hole 2214 and the first pin hole 2131; the bottom of the lower mounting groove 212 is provided with a second connecting block 214, the second connecting block 214 is provided with a third pin hole 2141, the lower end of the lower connecting plate 222 is provided with a third groove 2223 in clamping fit with the second connecting block 214, the side wall of the lower connecting plate 222 is provided with a fourth pin hole 2224 communicated with the third groove 2223, and the lower connecting plate 222 is fixed to the dumbbell sheet 21 after the pin passes through the fourth pin hole 2224 and the third pin hole 2141.

Taking the dumbbells in the attached drawings as an example, each group of weight balancing mechanisms 2 respectively comprises nine dumbbell pieces 21, the weight of each dumbbell piece 21 is set to be 1kg, the weight of each weight balancing piece 33 is set to be 0.5kg, the shifting block 31 is in a regular pentagonal star shape and is provided with five vertex angles and included angles, each vertex angle is a round angle, and the arc length between two adjacent vertex angles of the shifting block 31 is defined as one unit. Initially, the push rod 322 extends in a radially inward direction and abuts against the included angle of the shifting block 31, at this time, the other end of the push rod 322 does not extend into the second through hole 332, the weight plate 33 is separated from the middle tube 11, at this time, when the shifting block 31 rotates one unit, the ball 13394 jumps two positioning grooves 1328, the corresponding telescopic rod 12 completely extends into the assembling hole of one dumbbell plate 21 or completely extends out of the assembling hole of one dumbbell plate 21, the total weight of the dumbbell plates 21 assembled at two ends of the middle tube 11 is 2kg, 4kg, 6kg, 8kg, 10kg, 12kg, 14kg, 16kg or 18kg, and 2kg can be increased or reduced by one unit per rotation; when the dial 31 rotates by half a unit, the ball 13394 jumps one positioning slot 1328, the push rod 322 is pushed by the top angle of the dial 31 to move in the radial outward direction, the other end of the push rod 322 is inserted into the second through hole 332 at the moment, the first compression spring 323 is compressed, and the weight plate 33 is assembled at the end part of the middle tube 11 through the push rod 322, namely 1kg can be added on the basis of the current weight, so that the total weight of the dumbbell plates 21 assembled at the two ends of the middle tube 11 can be 2kg, 3kg, 4kg, 5kg, 6kg, 7kg, 8kg, 9kg, 10kg, 11kg, 12kg, 13kg, 14kg, 15kg, 16kg, 17kg, 18kg or 19kg, and the application range is expanded; when the shifting block 31 rotates by half a unit, the ball 13394 jumps one positioning slot 1328, the push rod 322 moves in the radial inward direction and abuts against the corner of the shifting block 31, the first compression spring 323 returns, the other end of the push rod 322 does not extend into the second through hole 332, and the weight plate 33 is separated from the middle tube 11.

The utility model is described above with reference to the accompanying drawings, it is obvious that the implementation of the utility model is not limited in the above manner, and it is within the scope of the utility model to adopt various modifications of the inventive method concept and solution, or to apply the inventive concept and solution directly to other applications without modification.

Claims

1. The utility model provides a dumbbell, includes handle (1) and two sets of counter weight mechanisms (2), its characterized in that: the handle (1) comprises a middle pipe (11), two telescopic rods (12) in sliding fit with the middle pipe (11) and a linear driving mechanism (13) arranged on the middle pipe (11), wherein the linear driving mechanism (13) is used for controlling the two telescopic rods (12) to approach to or depart from each other; the two groups of weight mechanisms (2) are symmetrically distributed at two ends of the middle pipe (11), each weight mechanism (2) comprises a plurality of dumbbell pieces (21) coaxial with the telescopic rod (12), a buckle assembly (22) is arranged between every two adjacent dumbbell pieces (21), each buckle assembly (22) is used for preventing the two adjacent dumbbell pieces (21) from moving axially relative to each other, and when the telescopic rods (12) are controlled by the linear driving mechanisms (13) to extend into one or more assembling holes of the dumbbell pieces (21), the corresponding quantity of dumbbell pieces (21) are assembled at two ends of the middle pipe (11) through the telescopic rods (12).

2. A dumbbell according to claim 1, characterized in that: the outer side walls of the two telescopic rods (12) are respectively provided with tooth parts (121) extending along the axial direction, the side wall of the middle tube (11) is provided with two openings (111) corresponding to the two tooth parts (121) one by one, the linear driving mechanism (13) comprises a sleeve (131) sleeved on the outer side of the middle tube (11), two ends of the sleeve (131) are respectively provided with a rotating seat (132), a connecting seat (133) and a locking piece (134), the rotating seat (132) is provided with a first central hole (1321) and an inner gear ring (1322), the connecting seat (133) is provided with a second central hole (1331), a shaft hole (1332), a transmission shaft (1333) rotationally matched with the shaft hole (1332), a first gear (1334) and a second gear (1335), and the dumbbell piece (21) of each group of counterweight mechanisms (2) closest to the middle tube (11) is defined as an inner dumbbell piece, the end part of the middle tube (11) sequentially passes through the first center hole (1321) and the second center hole (1331) and then extends into the assembly hole of the inner dumbbell piece, the rotating seat (132) is sleeved on the middle tube (11) and is in rotating fit with the middle tube (11), the middle tube (11) is fixedly connected with the inner dumbbell piece through the connecting seat (133), the first gear (1334) is fixedly arranged on the transmission shaft (1333) and is in meshing connection with the inner gear ring (1322), the second gear (1335) is fixedly arranged on the transmission shaft (1333), the second gear (1335) extends into the opening (111) and is in meshing connection with the tooth part (121), and the locking piece (134) is arranged between the connecting seat (133) and the rotating seat (132) and used for limiting the rotation of the rotating seat (132), when the locking piece (134) is unlocked, the sleeve (131) is rotated to enable the two rotating seats (132) to rotate synchronously, the rotating seats (132) drive the internal gear ring (1322), the first gear (1334), the transmission shaft (1333) and the second gear (1335) to rotate, and the second gear (1335) pushes the telescopic rod (12) to move along the axis through the tooth part (121).

3. A dumbbell according to claim 2, characterized in that: two cross rods (112) extending along the radial direction and four through holes (113) for the cross rods (112) to penetrate through are arranged in the middle pipe (11), the cross rods (112) divide the interior of the middle pipe (11) into two linear channels, the two telescopic rods (12) correspond to the two linear channels one by one, inserting holes (1336) communicated with the through holes (113) are formed in the inner side wall of the second central hole (1331), and the end portions of the cross rods (112) penetrate through the through holes (113) and then are inserted into the inserting holes (1336).

4. A dumbbell according to claim 2, characterized in that: a dial block (31) which is in a regular polygon shape, a first ring (32) which is coaxial with the inner dumbbell piece and a counterweight piece (33) are arranged between the connecting seat (133) and the inner dumbbell piece, the dial block (31) is fixedly arranged on the transmission shaft (1333) and is positioned on the inner side of the first ring (32), one end of the first ring (32) is fixedly connected with the inner dumbbell piece, a first perforation (321), a push rod (322) and a first compression spring (323) are arranged on the side surface of the first ring (32), the push rod (322) is in sliding fit with the first perforation (321), the push rod (322) is elastically connected with the first ring (32) through the first compression spring (323), one end of the push rod (322) is abutted against the dial block (31), the upper end of the counterweight piece (33) is downwards sunken to form a first groove (331) which is matched with the lower half part of the first ring (32), a second perforation (332) communicated with the first perforation (321) is arranged on the inner side wall of the first groove (331), when the vertex angle of the shifting block (31) is contacted with one end of the push rod (322) in the process that the shifting block (31) rotates along with the transmission shaft (1333), the push rod (322) moves in a radial outward direction, the other end of the push rod (322) is inserted into the second penetration hole (332), the first compression spring (323) is compressed, the weight plate (33) is fitted to the end of the intermediate pipe (11) through the push rod (322), when the top corner of the shifting block (31) is separated from one end of the push rod (322), the first compression spring (323) is restored, the push rod (322) moves in a radially inner direction, the other end of the push rod (322) protrudes from the second through hole (332), and the weight plate (33) is separated from the end of the intermediate tube (11).

5. A dumbbell according to claim 2, characterized in that: a first sleeve barrel (1325) coaxial with the middle pipe (11) is arranged on one side, close to the connecting seat (133), of the rotating seat (132), the annular gear (1322) is fixedly arranged on the inner side wall of the first sleeve barrel (1325), a plurality of positioning notches (1326) distributed in the circumferential direction are formed in the top end of the first sleeve barrel (1325), a second sleeve barrel (1337) sleeved on the outer side of the first sleeve barrel (1325) is arranged on one side, close to the rotating seat (132), of the connecting seat (133), a locking hole (1338) is formed in the side wall of the second sleeve barrel (1337), the locking piece (134) comprises a mounting seat (1341) fixedly arranged in the second sleeve barrel (1337) and a locking block (1342) matched with the locking hole (1338), and a sliding groove (1343) extending in the radial direction of the second sleeve barrel (1337) is formed in the mounting seat (1341), The sliding block (1344) is in sliding fit with the sliding groove (1343), and the second compression spring (1345) is located between the groove bottom of the sliding groove (1343) and one end of the sliding block (1344), the lock block (1342) is fixedly arranged at the other end of the sliding block (1344), when the second compression spring (1345) pushes the other end of the sliding block (1344) out of the sliding groove (1343), the sliding block (1344) is in clamping fit with one positioning notch (1326), and the lock block (1342) is inserted into the lock hole (1338).

6. A dumbbell according to claim 5, characterized in that: a coaxial second circular ring (1327) is fixedly arranged in the first sleeve (1325), a plurality of positioning grooves (1328) with the number equal to that of the positioning notches (1326) are arranged at one end, close to the connecting seat (133), of the second circular ring (1327), all the positioning grooves (1328) are distributed along the circumferential direction and correspond to all the positioning notches (1326) one by one, a first guide post (13391) extending into the second sleeve (1337) is arranged on the connecting seat (133), the first guide post (13391) is provided with a first counter bore (13392), a third compression spring (13393) and a ball bearing (13394), one end of the third compression spring (13393) is in contact with the inner bottom surface of the first counterbore (13392), the other end of the third compression spring (13393) is connected to the ball (13394) and presses the ball (13394) into one of the detents (1328).

7. A dumbbell according to claim 5, characterized in that: the counterweight mechanism is characterized by further comprising a support (4) for placing two groups of counterweight mechanisms (2), the lock hole (1338) is located on one side right below the second sleeve (1337), two pushing lugs (411) are arranged on the support (4), the pushing lugs (411) are located right below the lock hole (1338), when the counterweight mechanisms (2) are placed on the support (4), the pushing lugs (411) are inserted into the second sleeve (1337) through the lock hole (1338), the lock block (1342) is separated from the lock hole (1338) in the process, and the sliding block (1344) is separated from the positioning notch (1326).

8. A dumbbell according to claim 7, characterized in that: support (4) include base (41), two baffle (42) and two connecting rod (43), the one end and one of connecting rod (43) baffle (42) fixed connection, the other end of connecting rod (43) passes behind base (41) with another baffle (42) fixed connection, base (41) baffle (42) and two connecting rod (43) form with the standing groove of counter weight mechanism (2) looks adaptation, push up the fixed setting of lug (411) on base (41), the lower extreme butt of connecting seat (133) is in on base (41) and make push up lug (411) insert in lockhole (1338).

9. A dumbbell according to claim 1, characterized in that: an upper mounting groove (211) is formed in the upper end of the dumbbell sheet (21), a lower mounting groove (212) is formed in the lower end of the dumbbell sheet (21), the buckle assembly (22) comprises an upper connecting plate (221) detachably connected with the upper mounting groove (211) and a lower connecting plate (222) detachably connected with the lower mounting groove (212), a first limiting block (2211) is arranged on one side, away from the middle tube (11), of the upper connecting plate (221), a first limiting groove (2212) in up-and-down sliding fit with the first limiting block (2211) is formed in one side, close to the middle tube (11), of the upper connecting plate (221), and the upper end of the first limiting groove (2212) penetrates through the upper end face of the upper connecting plate (221); a second limiting block (2221) is arranged on one side, close to the middle pipe (11), of the lower connecting plate (222), a second limiting groove (2222) in up-and-down sliding fit with the second limiting block (2221) is arranged on one side, far away from the middle pipe (11), of the lower connecting plate (222), and the lower end of the second limiting groove (2222) penetrates through the lower end face of the lower connecting plate (222).

10. A dumbbell according to claim 9, characterized in that: a first connecting block (213) is arranged at the bottom of the upper mounting groove (211), a first pin hole (2131) is formed in the first connecting block (213), a second groove (2213) in clamping fit with the first connecting block (213) is formed in the lower end of the upper connecting plate (221), a second pin hole (2214) communicated with the second groove (2213) is formed in the side wall of the upper connecting plate (221), and a pin penetrates through the second pin hole (2214) and the first pin hole (2131) to fix the upper connecting plate (221) to the dumbbell sheet (21);

the tank bottom of lower mounting groove (212) is provided with second connecting block (214), be provided with third pinhole (2141) on second connecting block (214), the lower extreme of lower connecting plate (222) be provided with second connecting block (214) joint complex third recess (2223), be provided with down on the lateral wall of connecting plate (222) with fourth pinhole (2224) of third recess (2223) intercommunication, the pin passes fourth pinhole (2224) will behind third pinhole (2141) lower connecting plate (222) is fixed to on dumbbell piece (21).