CN212282678U

CN212282678U - Dumbbell and handle and base thereof

Info

Publication number: CN212282678U
Application number: CN202020827619.0U
Authority: CN
Inventors: 郭礼强
Original assignee: Individual
Current assignee: Haoshi Fitness Equipment Shanghai Co ltd
Priority date: 2020-05-18
Filing date: 2020-05-18
Publication date: 2021-01-05
Anticipated expiration: 2030-05-18

Abstract

The application relates to the sport equipment field especially relates to a dumbbell and handle and base thereof, and wherein, dumbbell handle includes: a handle body; the gear rotating assembly comprises a planetary gear mechanism and a gear shaft, the planetary gear mechanism is sleeved at one end of the gear shaft, and the other end of the gear shaft is nested in the first cavity of the handle body; a second cavity is formed in the gear shaft, at least two first threads which are symmetrically arranged are arranged on the inner wall of the second cavity of the gear shaft, and the number of turns of each first thread is at least two; the telescopic shaft is nested in the second cavity of the gear shaft, second threads matched with the first threads are correspondingly arranged on the side wall of the telescopic shaft, the planetary gear mechanism is rotated to drive the gear shaft to rotate, and then the telescopic shaft is driven to axially move in the second cavity of the gear shaft. The utility model discloses a dumbbell handle adjustment accuracy is high, can be quick accurate realization telescopic shaft stretch out, and then realize the quick increase and decrease of dumbbell piece.

Description

Dumbbell and handle and base thereof

Technical Field

The utility model relates to a sport equipment field especially relates to a dumbbell and handle and base thereof.

Background

Dumbbells are a simple device used for strengthening muscle strength training. The existing dumbbells are roughly divided into two types, one is a dumbbell with a fixed weight, and the other is a dumbbell with an adjustable weight. Generally, dumbbells with adjustable weights are assembled into dumbbells with different weights by adjusting the number of dumbbell sheets, and a dumbbell handle fixedly connected with the dumbbell sheets is also arranged to be adjustable and telescopic in order to adjust and install the number of dumbbell sheets. At present, in the prior art, the expansion adjustment mode of the dumbbell handle adopts a gear and rack structure, and the handle is rotated to drive the gear and rack to adjust the expansion of two ends of the handle; the other type is that the flexible of handle both ends is realized through working of plastics helicitic texture in the twist grip, and the flexible mode of handle both ends are realized through working of plastics helicitic texture in the twist grip, adjust the flexible at handle both ends because of the twist grip round, the event can only make the super large pitch of single circle, this kind of pitch too big clearance is also big, lead to its regulation precision not high, and be connected with rotating between dumbbell piece and the handle, this connected mode has certain clearance, make joint strength not enough, in the use, the dumbbell piece that appears the dumbbell both ends very easily produces the condition of rocking and droing, there is certain potential safety hazard.

Disclosure of Invention

To the not high technical problem of dumbbell handle length adjustment precision among the prior art, the utility model provides a dumbbell and handle and base thereof can improve the adjustment precision of dumbbell handle.

The utility model adopts the following technical scheme:

a dumbbell handle, comprising:

the handle comprises a handle body, wherein the handle body is provided with a first cavity, and two ends of the handle body are provided with symmetrical first flanges;

the gear rotating assembly comprises a planetary gear mechanism and a gear shaft, the planetary gear mechanism is sleeved at one end of the gear shaft, the other end of the gear shaft is nested in the first cavity of the handle body, and the planetary gear mechanism is rotationally connected with the first flange at one end of the handle body; a second cavity is formed in the gear shaft, at least two first threads which are symmetrically arranged are arranged on the inner wall of the second cavity of the gear shaft, and the number of turns of each first thread is at least two;

the telescopic shaft is nested in the second cavity of the gear shaft, second threads matched with the first threads are correspondingly arranged on the side wall of the telescopic shaft, the planetary gear mechanism is rotated to drive the gear shaft to rotate, and then the telescopic shaft is driven to axially move in the second cavity of the gear shaft.

The utility model discloses in first being applied to the dumbbell handle with planetary gear mechanism (including bull gear, sun gear and three planetary gear), utilize the multiple relation of bull gear number of teeth and sun gear number of teeth, through setting up the concrete structure of planetary gear mechanism, gear shaft, handle body, telescopic shaft and the cooperation relation between each structure for the regulation precision of dumbbell handle is higher. Specifically, the planetary gear mechanism is fixedly arranged at one end of the gear shaft, the other end of the gear shaft is nested in a first cavity of the handle body, and the telescopic shaft is nested in a second cavity of the gear shaft; the inner wall of the second cavity of the gear shaft is provided with at least two first threads which are symmetrically arranged, the number of turns of each first thread is at least two, the side wall of the telescopic shaft is correspondingly provided with second threads matched with the first threads, and the planetary gear mechanism is rotated to drive the gear shaft to rotate so as to drive the telescopic shaft to axially move in the second cavity of the gear shaft. The dumbbell handle of above-mentioned structure, because every screw thread on the gear shaft inner wall sets up to at least two circles for the thread pitch reduces, if the number of teeth of bull gear is the twice of sun gear number of teeth, then under the condition of rotating planetary gear mechanism, bull gear turns round, the gear shaft then corresponding rotation two circles, and then promotes the relative activity between telescopic shaft and the handle body, makes the telescopic shaft can rotate two circles on adjusting the stroke, thereby has improved the regulation precision of dumbbell handle.

Optionally, a first groove along the length direction of the telescopic shaft is formed in the side wall of the telescopic shaft.

Optionally, the planetary gear mechanism further comprises a second flange, the planetary gear mechanism comprises a large gear ring, a sun gear and three planetary gears, and the large gear ring and the sun gear are both meshed with the planetary gears; the second flange is in clearance fit with the large gear ring, and the first flange, the planetary gear mechanism and the second flange are fixed into a whole through a screw.

Optionally, the positioning device further comprises a position clamping pin device, a clamping groove is formed in the edge of the second flange, and the position clamping pin device is arranged in the clamping groove of the second flange in a sliding mode, so that the position clamping pin device is used for clamping the large gear ring and the telescopic shaft.

Optionally, the position clamping pin device comprises an elastic piece and a clamping block, a third cavity is formed in the end portion of one end of the clamping block, a protrusion is arranged on the side surface of the clamping block close to the third cavity, the elastic piece is assembled on the third cavity, and the elastic piece and the protrusion are matched together for meshing and locking the large gear ring.

Optionally, one end of the protrusion is serrated, so that the protrusion can be meshed with the large gear ring conveniently.

And simultaneously, the utility model also provides a dumbbell, including the aforesaid dumbbell handle, dumbbell handle's both ends all are equipped with a plurality of dumbbell pieces.

Optionally, the dumbbell piece comprises a dumbbell piece body, the dumbbell piece body is provided with a first through hole, a connecting bump extends integrally from the edge of the dumbbell piece body, and the edge of the dumbbell piece body is provided with a first clamping groove; the adjacent dumbbell pieces are clamped in the first clamping groove of the other dumbbell piece through the connecting lug of one dumbbell piece and are attached together.

Optionally, the dumbbell piece close to the dumbbell handle is a dumbbell head piece, the dumbbell head piece is provided with a second through hole, a plurality of third through holes for the screw rod to penetrate through are uniformly distributed in the circumferential direction of the second through hole, and the dumbbell head piece penetrates through the third through holes through the screw rod and is fixed with the first flange.

Furthermore, the utility model also provides a dumbbell base, dumbbell base is equipped with the ejector pin device, the ejector pin device with the aforesaid dumbbell handle cooperate, the regulation of the dumbbell handle length of being convenient for.

Optionally, the ejector rod device comprises a second bump, and the diameter of the second bump becomes smaller as the distance of the second bump approaches the clamping pin device.

The utility model has the advantages that:

the utility model discloses in first being applied to the dumbbell handle with planetary gear mechanism, utilize the number of teeth of bull gear and the number of teeth multiple relation of sun gear, through setting up planetary gear mechanism, the gear shaft, the handle body, the concrete structure of telescopic shaft and the cooperation relation between each structure for telescopic shaft in the dumbbell handle is adjusted through littleer pitch, thereby it is higher to make the regulation precision, and the dumbbell handle of this structure compares in current dumbbell handle, its structural strength is higher, and more nimble smooth and easy when adjusting.

Description of the drawings:

FIG. 1 is an exploded view of the handle of the dumbbell of the present invention;

FIG. 2 is a schematic structural view of the handle body of the dumbbell of the present invention;

FIG. 3 is a schematic structural view of the gear rotating assembly in the dumbbell handle of the present invention;

FIG. 4 is a cross-sectional view of the gear rotating assembly of the dumbbell handle of the present invention;

FIG. 5 is a schematic structural view of the telescopic shaft in the handle of the dumbbell of the present invention;

FIG. 6 is a schematic structural view of a second flange of the handle of the dumbbell of the present invention;

fig. 7 is a schematic structural view of a clamping block in the clamping pin device of the present invention;

FIG. 8 is a schematic structural view of a dumbbell of the present invention;

FIG. 9 is an exploded view of the dumbbell of the present invention;

FIG. 10 is a schematic structural view of the first dumbbell piece of the present invention;

FIG. 11 is a schematic view of one of the dumbbell pieces of the present invention;

FIG. 12 is a schematic structural view of the dumbbell of the present invention placed on the base of the dumbbell;

fig. 13 is a schematic structural view of a dumbbell base in the dumbbell of the present invention.

The figures are numbered:

1. a handle body; 2. a first cavity; 3. a first flange; 4. a planetary gear mechanism; 5. a gear shaft; 6. a second cavity; 7. a first thread; 8. a telescopic shaft; 9. a second thread; 10. a large gear ring; 11. a sun gear; 12. a planetary gear; 13. a first groove; 14. a second flange; 15. a detent pin device; 16. a clamping groove; 17. a second groove; 18. a first hollow column; 19. a second hollow column; 20. a clamping block; 21. a third cavity; 22. a protrusion; 23. a dumbbell sheet; 24. a dumbbell sheet body; 25. a first through hole; 26. a connection bump; 27. a first engaging groove; 28. a first dumbbell piece; 29. a second through hole; 30. a third through hole; 31. a fixing member; 32. a dumbbell base; 33. a push rod device; 34. a dumbbell holder; 35. a first connection bump; 36. and (5) decorating the large ring.

The specific implementation mode is as follows:

the present invention will be described in detail with reference to the accompanying drawings.

As shown in fig. 1 to 5, a handle for a dumbbell comprises:

the handle comprises a handle body 1, wherein the handle body 1 is provided with a first cavity 2, and two ends of the handle body 1 are provided with symmetrical first flanges 3;

the gear rotating assembly comprises a planetary gear mechanism 4 and a gear shaft 5, the planetary gear mechanism 4 is sleeved and fixed at one end of the gear shaft 5, the other end of the gear shaft 5 is nested in the first cavity 2 of the handle body 1, and the planetary gear mechanism 4 is rotatably connected with the first flange 3 at one end of the handle body 1; a second cavity 6 is formed inside the gear shaft 5, at least two first threads 7 which are symmetrically arranged are arranged on the inner wall of the second cavity 6 of the gear shaft 5, the number of turns of each first thread 7 is at least two, and the gear shaft 5 rotates through the rotation of the planetary gear mechanism 4;

the telescopic shaft 8 is nested in the second cavity 6 of the gear shaft 5, second threads 9 matched with the first threads 7 are correspondingly arranged on the side wall of the telescopic shaft 8, the planetary gear mechanism 4 is rotated to drive the gear shaft 5 to rotate, and then the telescopic shaft 8 is driven to axially move in the second cavity 6 of the gear shaft 5.

Referring to fig. 3-4, in the present embodiment, the planetary gear mechanism 4 of the present invention includes a large gear ring 10, a sun gear 11 and three planet gears 12, wherein the large gear ring 10 and the sun gear 11 are both meshed with the planet gears 12; in general, the number of teeth of the ring gear 10 in the planetary gear mechanism 4 is twice that of the sun gear 11, so that the ring gear 10 makes one rotation and the gear shaft 5 makes two corresponding rotations. In other embodiments, the number of teeth of the ring gear 10 and the number of teeth of the sun gear 11 may be other numbers, such as 3 times, 4 times, etc.

In this embodiment, the outer surface wall of the bull gear ring 10 is provided with a dial, and the dial is provided with a corresponding scale value, so that a user can conveniently rotate the corresponding scale for the bull gear ring according to actual requirements.

In the utility model, the planetary gear mechanism 4 is sleeved at one end of the gear shaft 5, the other end of the gear shaft 5 is nested in the first cavity 2 of the handle body 1, the planetary gear mechanism 4 is rotationally connected with the first flange 3 at one end of the handle body 1 through a screw rod penetrating into an inner hole of the planetary gear 12, because the gear shaft 5 is provided with the second cavity 6, the inner wall of the second cavity 6 of the gear shaft 5 is provided with at least two first threads 7 which are symmetrically arranged, the number of turns of each first thread 7 is at least two, the telescopic shaft 8 is nested in the second cavity 6 of the gear shaft 5, the side wall of the telescopic shaft 8 is correspondingly provided with a second thread 9 which is matched with the first thread 7, so that the telescopic shaft 8 is rotationally matched and connected with the gear shaft 5, when the planetary gear mechanism 4 rotates under the action of external force, the gear shaft 5 can correspondingly rotate, and further drives the telescopic shaft 8 to rotate relative to the, the axial movement is generated, so that the telescopic shaft 8 extends out of or retracts into the second cavity 6 of the gear shaft 5, the telescopic shaft 8 can be freely stretched, and the length of the dumbbell handle can be freely adjusted. Because the number of teeth of bull gear 10 and the number of teeth of sun gear 11 have specific multiple relation, generally, the number of teeth of bull gear 10 and the number of teeth of sun gear 11 are twice, and bull gear 10 rotates a circle, and the corresponding rotation of gear shaft 5 is two circles, and every first screw thread 7 on the corresponding gear shaft 5 inner wall and second external screw thread 9 on the telescopic shaft 8 lateral wall are two circles at least, compare in the dumbbell handle that has single circle screw thread among the prior art, the utility model provides a pitch is little, the clearance is little, and the regulation precision is high, makes telescopic shaft 8 can be fast and accurate business turn over from in the handle body 1; simultaneously, the dumbbell handle of this structure compares in current dumbbell handle, and structural strength is higher to more nimble smooth and easy when adjusting.

As shown in fig. 5, the side wall of the telescopic shaft 8 is provided with a first groove 13 along the length direction thereof. The second screw thread 10 on the side wall of the telescopic shaft 8 is two circles, two first screw threads 7 are arranged on the inner wall of the gear shaft 5, one first screw thread 7 is a positive screw thread, the other first screw thread 7 is a negative screw thread, and the corresponding telescopic shaft 8 is divided into a positive screw thread shaft and a negative screw thread shaft.

In other embodiments, the number of turns of the second thread 9 and the first thread 7 can be other values, for example, 3 turns, so that the telescopic shaft 8 can be made into 3 turns in the adjusting stroke, the thread pitch is smaller, and the adjusting precision of the dumbbell handle is further improved.

As shown in fig. 1, in the present embodiment, the planetary gear set further includes a second flange 14, the second flange 14 is in clearance fit with the large ring gear 10, and the first flange 3, the planetary gear mechanism 4, and the second flange 14 are fixed together by screws.

As shown in fig. 6-7, in the present embodiment, the locking device 15 is further included, the edge of the second flange 14 has a locking groove 16, and the locking device 15 is slidably disposed in the locking groove 16 of the second flange 14, so that the locking device 15 is used for locking the large gear ring 10 with the telescopic shaft 8.

As shown in fig. 6, in an embodiment, the surface of the second flange 14 has a second groove 17, a bottom of the second groove 17 is provided with a first hollow column 18 and six second hollow columns 19, the first hollow column 18 and the second hollow column 19 both penetrate through the bottom of the second groove 17, the six second hollow columns 19 are uniformly arranged around the first hollow column 18, and the engaging groove 16 is arranged between a pair of adjacent second hollow columns 19, wherein the six second hollow columns include three a second hollow columns and three B second hollow columns, a height of each a second hollow column is smaller than a height of each B second hollow column, and the a second hollow columns and the B second hollow columns are adjacently distributed. In use, the second flange 14 is in clearance fit with the large gear ring 10, the planetary gear mechanism 4 is fixed on the first flange 3 by three screws M6 passing through three hollow columns A of the second hollow columns 19 of the second flange 14 and through the internally toothed holes of the three planet gears 12, the large gear ring 10 of the planetary gear mechanism 4 is clamped between the first flange 3 and the second flange 14, the three are in clearance fit, and the planet gears can rotate freely.

As shown in fig. 7, in the present embodiment, the locking pin device 15 includes an elastic member (not shown) and a locking block 20, an end of one end of the locking block 20 is provided with a third cavity 21, a side surface of one end of the locking block 20 provided with the third cavity 21 is provided with a protrusion 22, the elastic member is assembled on the third cavity 21, and the elastic member and the protrusion 22 cooperate together to engage and lock the large gear ring 10. When external force acts on the position clamping pin device 15, the position clamping pin device 15 moves in the clamping groove 16, so that the position clamping pin device 15 is separated from the large gear ring 10, and the large gear ring 10 rotates to drive the telescopic shaft 10 to stretch; when the external force applied to the locking pin device 15 disappears, the locking pin device 15 returns to the original position under the elastic force of the elastic element, and the large gear ring 10 and the telescopic shaft 8 are locked again.

In the embodiment, the number of the third cavities 21 at the end of the clamping block 20 may be one or more, and the elastic member and the clamping block 20 are detachably connected or fixed as a whole; the elastic member may be a spring.

In the embodiment, one end of the protrusion 22 is serrated, so as to be engaged with the large gear ring 10 and lock the large gear ring 10 and the telescopic shaft 8; in practice, the raised structure may also have other shapes.

As shown in fig. 1, in the process of assembling the dumbbell handle of the present invention, the planetary gear mechanism 4 is first installed into the first cavity 2 of the handle body 1 through the gear shaft 5, the two are in clearance fit, then the second flange 14 with the clamp pin device 15 assembled is installed, and the second flange 14 is fixed on the first flange 3 at one end of the handle body 1 by three screws passing through the inner tooth holes of the planetary gear 12, and similarly, the other end of the handle body 1 is also symmetrically provided with the decorative large ring 36 and the second flange 14; finally, the telescopic shaft 8 is installed, and the telescopic shaft 8 penetrates through the second flange 14 to be in threaded fit with the gear shaft 5 to form the dumbbell handle with adjustable length. In this arrangement, the decorative large ring 36 is provided at one end of the dumbbell handle to be symmetrical with the large ring gear 10 at the other end. Meanwhile, the planetary gear mechanism 4 can be stably and firmly connected to the handle body 1 under the matching of the first flange 3 and the second flange 14.

Meanwhile, as shown in fig. 8-9, the utility model also provides a dumbbell, which comprises the dumbbell handle, wherein a plurality of dumbbell pieces 23 are arranged at both ends of the dumbbell handle.

When the dumbbell is used, a user can flexibly and freely assemble a plurality of dumbbell pieces 23 on the dumbbell handle according to requirements to form a dumbbell, and the number of the dumbbell pieces 23 can be quickly increased, decreased and adjusted.

As shown in fig. 10-11, in the present embodiment, the dumbbell sheet 23 includes a dumbbell sheet body 24, the dumbbell sheet body 24 has a first through hole 25, a connecting protrusion 26 integrally extends from an edge of the dumbbell sheet body 24, and the edge of the dumbbell sheet body 24 has a first engaging groove 27; the adjacent dumbbell sheets 23 are clamped in the first clamping groove 27 of the other dumbbell sheet through the connecting lug 26 of one dumbbell sheet and are jointed together.

The number of the connecting protrusions 26 and the first engaging grooves 27 may be one or more, and when the number of the connecting protrusions 26 and the number of the first engaging grooves 27 are multiple, the connecting protrusions 26 and the first engaging grooves 27 are respectively distributed at intervals on the edge of the dumbbell sheet body 24.

In this embodiment, the number of the connecting protrusion 26 and the first engaging groove 27 is one for the first dumbbell piece, two for the middle dumbbell piece, and one protrusion and two engaging grooves for the end dumbbell piece. The connecting convex blocks 26 and the first clamping grooves 27 are respectively distributed at 180 degrees at the edge of the dumbbell sheet body 24.

It should be noted that the first dumbbell piece is the first dumbbell piece mounted on the handle of the dumbbell, and the middle dumbbell piece is the middle dumbbell piece 23 far from the handle relative to the first dumbbell piece; the dumbbell tail sheet is the dumbbell sheet which is finally left in the dumbbell base.

As shown in fig. 11, the dumbbell sheet 23 close to the dumbbell handle is a first dumbbell sheet 28, the dumbbell sheet 23 far from the dumbbell handle relative to the first dumbbell sheet is a middle dumbbell sheet, the first dumbbell sheet 28 has a second through hole 29, a plurality of third through holes 30 for the screw to penetrate are uniformly distributed in the circumferential direction of the second through hole 29, and the first dumbbell sheet 28 penetrates through the third through holes 30 through the screw to be fixed to the first flange 3. In the embodiment, the dumbbell head plate 28 passes through the third through hole 30 by 3 screws, then penetrates into the second hollow column 19 of the second flange corresponding to the third through hole 30 of the dumbbell head plate 28, penetrates through the gap between the adjacent planetary gears 12, and then is fixed on the first flange 3 of the handle body 1. This setting has improved the joint strength between dumbbell piece 23 and the dumbbell handle, the effectual potential safety hazard that has solved dumbbell piece 23 and has come off from the dumbbell handle.

In this embodiment, the inner wall of the second through hole 29 of the first dumbbell piece 28 is provided with a fixing member 31 which is matched with the groove 13 of the telescopic shaft 8, so that the telescopic shaft 8 cannot rotate, when the planetary gear mechanism 4 is rotated, the handle body 1 and the telescopic shaft 8 move relatively, and the length of the dumbbell handle is adjusted, so that dumbbell pieces 23 with different numbers can be assembled conveniently.

Furthermore, the utility model also provides a dumbbell base, as shown in fig. 12, dumbbell base 32 is equipped with ejector pin device 33, and ejector pin device 33 cooperatees with foretell dumbbell handle, the regulation of the dumbbell handle length of being convenient for. As shown in fig. 13, the plunger device 33 includes a second protrusion, the diameter of the upper end of the second protrusion is smaller than or equal to the diameter of the engaging groove 16 of the second flange 14, and the diameter of the second protrusion gradually decreases as the distance from the engaging pin device 15 decreases. The second bump may have a trapezoidal cross section. This arrangement facilitates better jacking of the detent pin arrangement 15 by the ram arrangement 33. Specifically, when putting the assembled dumbbell on the dumbbell support, ejector pin device 33 can jack up screens round pin gear 15 for joint piece 20 separates with bull gear 10, rotates bull gear 10, and gear shaft 5 is corresponding rotates, and it is flexible to drive telescopic shaft 8, thereby realizes the quick increase and decrease of dumbbell piece 23.

As shown in fig. 13, in the embodiment, the dumbbell base 32 includes a dumbbell holder 34, a first connecting protrusion 35 is disposed on the inner side of the dumbbell holder 34, and the first connecting protrusion 35 is engaged with the first engaging groove 27 of the dumbbell sheet body 24; is used for fixing the dumbbell tail piece and can not move left and right.

The above only is the preferred embodiment of the present invention, not therefore the limit the patent protection scope of the present invention, all applications the equivalent structure transformation made by the contents of the specification and the drawings of the present invention is directly or indirectly applied to other related technical fields, and all the same principles are included in the protection scope of the present invention.

Claims

1. A dumbbell handle, comprising:

2. The dumbbell handle of claim 1, wherein the side wall of the telescopic shaft is provided with a first groove along its length.

3. The dumbbell handle of claim 1, further comprising a second flange, the planetary gear mechanism including a large ring gear, a sun gear, and three planet gears, the large ring gear and the sun gear each meshing with the planet gears; the second flange is in clearance fit with the large gear ring, and the first flange, the planetary gear mechanism and the second flange are fixed into a whole through a screw.

4. The dumbbell handle of claim 3, further comprising a detent pin device, wherein the rim of the second flange has a detent groove, and the detent pin device is slidably disposed in the detent groove of the second flange, such that the detent pin device is used to engage the large gear ring with the telescopic shaft.

5. The dumbbell handle of claim 4, wherein the catch pin means comprises an elastic member and a catch block, the end of one end of the catch block is provided with a third cavity, a protrusion is provided on the side surface of the catch block near the third cavity, the elastic member is assembled on the third cavity, and the elastic member and the protrusion cooperate together to engage and lock the large gear ring.

6. The dumbbell handle of claim 5, wherein one end of the protrusion is serrated to facilitate engagement with the bull gear rim.

7. A dumbbell comprising a dumbbell handle according to any one of claims 1 to 6, the handle being provided with a plurality of dumbbell pieces at each end.

8. The dumbbell of claim 7, wherein the dumbbell sheet comprises a dumbbell sheet body, the dumbbell sheet body is provided with a first through hole, a connecting lug integrally extends out of the edge of the dumbbell sheet body, and the edge of the dumbbell sheet body is provided with a first clamping groove; the adjacent dumbbell pieces are clamped in the first clamping groove of the other dumbbell piece through the connecting lug of one dumbbell piece and are attached together.

9. The dumbbell of claim 7, wherein the dumbbell piece close to the dumbbell handle is a dumbbell head piece, the dumbbell head piece is provided with a second through hole, a plurality of third through holes for a screw to penetrate through are uniformly distributed in the circumferential direction of the second through hole, and the dumbbell head piece is fixed with the first flange by the screw penetrating through the third through holes.

10. A dumbbell base for placing a dumbbell as claimed in any of claims 7 to 9, the dumbbell base being provided with a push rod device which cooperates with a dumbbell handle as claimed in any of claims 1 to 6 to adjust the length of the dumbbell handle.

11. The dumbbell of claim 10, wherein the ejector means includes a second projection having a diameter that gradually decreases with decreasing distance from the detent pin means.