Weight-adjustable dumbbell

Abstract

The weight-adjustable dumbbell comprises a dumbbell body, two groups of weight stacks and a base, the base is provided with two first output gears and a driving device used for controlling the two first output gears to rotate synchronously. Two telescopic rods, two second output gears and two input gears are arranged in the dumbbell body, racks are arranged on the two telescopic rods respectively, the two second output gears are meshed with the racks on the two telescopic rods respectively, and the two input gears are in transmission connection with the two second output gears through transmission assemblies respectively; when the dumbbell body is placed at the dumbbell body placing position, the two input gears are respectively meshed with the two first output gears; the driving device can drive the two telescopic rods to stretch out from the left side and the right side of the dumbbell body in the axial direction to be connected with the corresponding weight stacks in the two sets of weight stacks or retract from the left side and the right side of the dumbbell body in the axial direction to be separated from the corresponding weight stacks in the two sets of weight stacks, and therefore weight adjustment of the dumbbell is achieved. The device has the advantages of being high in safety, good in user experience, easy and labor-saving in weight adjusting operation and the like.

Description

Technical Field

[0001] The utility model relates to the technical field of fitness and / or sports goods, in particular to an adjustable-weight dumbbell. Background Art

[0002] At present, there is an adjustable-weight dumbbell on the market, which includes a dumbbell body, two groups of counterweight plates and a base. The base is provided with two counterweight plate storage positions distributed left and right and a dumbbell body placement position located between the two counterweight plate storage positions. The two groups of counterweight plates are respectively stored on the two counterweight plate storage positions, and the dumbbell body can be placed on the dumbbell body placement position. The dumbbell body includes a handle, two telescopic rods arranged in the handle and an intermediate transmission mechanism arranged between the handle and the two telescopic rods. When adjusting the weight of the dumbbell, by rotating the handle, the two telescopic rods are driven by the intermediate transmission mechanism to respectively extend axially from the left and right sides of the dumbbell body to be connected with the corresponding counterweight plates in the two groups of counterweight plates or retract axially from the left and right sides of the dumbbell body to be disengaged from the corresponding counterweight plates in the two groups, so as to complete the adjustment. At the same time, when in use, the dumbbell is lifted by holding the handle to perform various forms of exercises.

[0003] For this kind of dumbbell with such a structure, since the weight adjustment of the dumbbell and the lifting exercise of the dumbbell are both realized by means of the handle, there are certain safety hazards for users during the exercise process, and it is easy to cause the counterweight plates to fall off due to accidental retraction of the two extension rods caused by misoperation. Although in the prior art, there are also some dumbbells designed with corresponding limiting structures to lock the handle, since the handle is always connected to the two telescopic rods through the intermediate transmission mechanism, the risk of misoperation still exists.

[0004] Therefore, it is necessary for relevant practitioners to make improvements. Summary of the Utility Model

[0005] The purpose of the utility model is to overcome the above-mentioned deficiencies of the prior art and provide an adjustable-weight dumbbell with high safety, good user experience and easy and labor-saving operation.

[0006] The purpose of the utility model is realized through the following technical solutions:

[0007] An adjustable weight dumbbell comprises a dumbbell body, two sets of weight plates and a base, the base is provided with two weight plate storage positions distributed on the left and right for storing the two sets of weight plates respectively, and a dumbbell body placement position located between the two weight plate storage positions and for placing the dumbbell body, the base is also provided with two first output gears distributed on the left and right and a driving device for controlling the synchronous rotation of the two first output gears; two telescopic rods, two second output gears and two input gears are provided on the left and right sides of the dumbbell body, and the two telescopic rods are respectively provided with a plurality of gears along the length direction thereof. The two second output gears are respectively meshed with the racks on the two telescopic rods, and the two input gears are respectively connected to the two second output gears through the transmission assembly; when the dumbbell body is placed in the dumbbell body placement position, the two input gears are respectively meshed with the two first output gears. At this time, the driving device can drive the two telescopic rods to extend axially from the left and right sides of the dumbbell body and connect with the corresponding weight plates in the two groups of weight plates, or retract axially from the left and right sides of the dumbbell body and disengage from the corresponding weight plates in the two groups of weight plates.

[0008] Furthermore, two elastic locking mechanisms cooperating with two input gears are provided on the left and right sides of the dumbbell body. The two elastic locking mechanisms can lock the two input gears when the dumbbell body leaves the dumbbell body placement position, and can be pushed by the dumbbell body placement position to release the locking of the two input gears when the dumbbell body is placed in the dumbbell body placement position.

[0009] Furthermore, a plurality of locking grooves are circumferentially provided on the two input gears, and the two elastic locking mechanisms each include a locking block arranged on the outer side of the lower end of the corresponding input gear and a spring for causing the locking block to tend downward, the lower end of the locking block is exposed on the lower side of the dumbbell body, and a locking portion is provided on the upper end of the locking block, which can be inserted into any locking groove of the corresponding input gear to lock the input gear; when the dumbbell body is placed in the dumbbell body placement position, the lower end of the locking block is pushed against by the dumbbell body placement position to cause the locking portion to disengage upward from the aforementioned inserted locking groove, thereby releasing the lock on the input gear.

[0010] Furthermore, the two weight plate storage positions and the dumbbell body placement position are formed on the upper surface of the base, the two first output gears are installed in the base at positions on the left and right sides corresponding to the dumbbell body placement position, and the left and right sides of the dumbbell body placement position are provided with two openings for exposing the two first output gears, and when the dumbbell body is placed in the dumbbell body placement position, the two input gears are respectively meshed with the two first output gears in parallel.

[0011] Further, the driving device includes a knob exposed outside the base, a first rotating shaft connected to the knob and extending into the base, a first bevel gear mounted on the first rotating shaft, a second bevel gear meshing with the first bevel gear, a second rotating shaft axially penetrating the second bevel gear and fixedly connected to the second bevel gear, two driving pulleys respectively mounted on the left and right ends of the second rotating shaft, two driven pulleys coaxially arranged with the two first output gears respectively, and two synchronous belts respectively connecting the corresponding driving pulleys and driven pulleys.

[0012] Further, a U-shaped support is further provided in the base. The U-shaped support includes a bottom plate fixedly connected to the bottom wall of the base and two side plates vertically extending upward from the left and right sides of the bottom plate. The left and right ends of the second rotating shaft are respectively mounted on the front ends of the two side plates through first bearings, and the two first output gears and the two driven pulleys are respectively mounted on the inner sides of the rear ends of the two side plates through two first support shafts.

[0013] Further, the two first support shafts are respectively fixedly connected to the two side plates through a connecting bolt exposed on the opposite outer sides of the two side plates. Lower parts of the left and right sides of the dumbbell body are respectively provided with a downward-opening limiting clip. When the dumbbell body is placed at the dumbbell body placement position, the limiting clip is sleeved on the exposed part of the corresponding connecting bolt.

[0014] Further, the driving device further includes two synchronous belt tensioning mechanisms. Each of the two synchronous belt tensioning mechanisms includes a chute, a second support shaft, a nut, a tensioning pulley, and a limiting screw. The chute is opened in the corresponding side plate in the up and down direction. One end of the second support shaft penetrates through the chute and the protruding end is connected to the nut. The tensioning pulley is rotatably mounted on the other end of the second support shaft, and the tensioning pulley abuts against the outer side of the corresponding synchronous belt. The limiting screw is screwed into the bottom wall of the base and passes through the bottom plate to abut against the lower side of the second support shaft.

[0015] Further, the axes of the two telescopic rods are on the same straight line. The two input gears are respectively coaxially arranged with the two telescopic rods. The transmission component includes a large bevel gear coaxially arranged outside the corresponding input gear and fixedly connected to the input gear, a small bevel gear meshing with the large bevel gear, and a third rotating shaft coaxially connecting the small bevel gear and the corresponding second output gear. The two ends of the third rotating shaft are respectively mounted on the dumbbell body through second bearings.

[0016] Further, the dumbbell body includes a grip and two dumbbell heads arranged at both ends of the grip. A part of the two telescopic rods is located inside the grip, and the other part is located inside the corresponding dumbbell head. The two second output gears and the two input gears are both located inside the corresponding dumbbell head. The outer surfaces of the two telescopic rods are respectively provided with positioning grooves extending along the axial direction, and the inner walls on the left and right sides of the grip are respectively provided with positioning ribs that cooperate with the corresponding positioning grooves.

[0017] Compared with the prior art, the utility model has the following beneficial effects:

[0018] First of all, when adjusting the weight of the dumbbell in the utility model, since it is realized by driving the two telescopic rods to extend or retract through the driving device arranged on the base via the intermediate transmission link, that is, the driving source is arranged on the base rather than on the dumbbell body. Therefore, when holding the dumbbell body by hand for exercise, the occurrence of misoperation can be effectively avoided, thus ensuring the safety of use. Moreover, the structural design of the utility model that avoids the driving source from the dumbbell body also provides users with more sufficient sense of security in terms of psychology and visual impression, and the user experience is good.

[0019] Secondly, the intermediate transmission link of the utility model is designed with a gear transmission structure, so that users can adjust the weight of the dumbbell more easily and labor-savingly. Description of the Drawings

[0020] Figure 1 is a three-dimensional schematic diagram of an adjustable-weight dumbbell of the utility model.

[0021] Figure 2 is an exploded schematic diagram of an adjustable-weight dumbbell of the utility model.

[0022] Figure 3 is an exploded schematic diagram of the base in the utility model.

[0023] Figure 4 is a structural schematic diagram of the driving device in the utility model.

[0024] Figure 5 is a partial structural schematic diagram of the driving device in the utility model.

[0025] Figure 6 is a cross-sectional schematic diagram of the dumbbell body in the utility model.

[0026] Figure 7 is an exploded schematic diagram of the dumbbell body in the utility model.

[0027] Figure 8 is Figure 7 an enlarged schematic diagram of A in

[0028] Figure 9 is Figure 7A magnified schematic diagram of B.

[0029] Figure 10 It is a schematic diagram of the cooperation between the elastic locking mechanism and the input gear in the utility model.

[0030] Figure 11 It is a partial structural schematic diagram of the dumbbell body in the utility model, and shows the setting position of the positioning convex rib. DETAILED DESCRIPTION

[0031] The utility model is further described in detail below with reference to the embodiments given in the accompanying drawings.

[0032] like Figures 1 to 11 As shown, the utility model discloses an adjustable weight dumbbell, comprising a dumbbell body 1, two sets of weight plates 2 and a base 3. The base 3 is provided with two weight plate storage positions 31 distributed left and right for storing two sets of weight plates 2 respectively, and a dumbbell body placement position 32 located between the two weight plate storage positions 31 and for placing the dumbbell body 1. The base 3 is also provided with two first output gears 41 distributed left and right and a driving device 4 for controlling the two first output gears 41 to rotate synchronously.

[0033] Two telescopic rods 11, two second output gears 12 and two input gears 13 are provided on the left and right sides of the dumbbell body 1. Specifically, the dumbbell body 1 may include a handle 1a and two dumbbell heads 1b arranged at both ends of the handle 1a. A portion of the two telescopic rods 11 is located in the handle 1a, and another portion is located in the corresponding dumbbell head 1b. The two second output gears 12 and the two input gears 13 are both located in the corresponding dumbbell head 1b. The two telescopic rods 11 are respectively provided with racks 111 extending along the length direction thereof. The two second output gears 12 are respectively meshed with the racks 111 on the two telescopic rods 11. The two input gears 13 are respectively connected to the two second output gears 12 through the transmission assembly 14.

[0034] When the dumbbell body 1 is placed in the dumbbell body placement position 32, the two input gears 13 are respectively meshed with the two first output gears 41. At this time, the driving device 4 can drive the two telescopic rods 11 to extend axially from the left and right sides of the dumbbell body 1 and connect with the corresponding weight plates in the two sets of weight plates 2, or retract axially from the left and right sides of the dumbbell body 1 and disengage from the corresponding weight plates in the two sets of weight plates 2, thereby realizing the weight adjustment of the dumbbell.

[0035] Two elastic locking mechanisms 15 cooperating with the two input gears 13 are also provided on the left and right sides of the dumbbell body 1. The two elastic locking mechanisms 15 can lock the two input gears 13 when the dumbbell body 1 leaves the dumbbell body placement position 32, so that when the user lifts the dumbbell body 1 for exercise, the two input gears 13, the transmission assembly 14 and the two second output gears 12 will not rotate, thereby preventing the two telescopic rods 11 from axial displacement at this time, further ensuring the safety of use. In addition, the two elastic locking mechanisms 15 can also be pushed by the dumbbell body placement position 32 when the dumbbell body 1 is placed in the dumbbell body placement position 32 to release the locking of the two input gears 13, so that the driving device 4 can drive the two telescopic rods 11 to axial displacement at this time, thereby meeting the needs of dumbbell weight adjustment.

[0036] In a preferred example of the present invention, a plurality of locking grooves 131 are circumferentially provided on the two input gears 13, and the two elastic locking mechanisms 15 each include a locking block 151 provided on the outer side of the lower end of the corresponding input gear 13 and a spring 152 for causing the locking block 151 to tend downward, the lower end of the locking block 151 is exposed at the lower side of the dumbbell body 1, and a locking portion 1511 is provided at the upper end of the locking block 151, which can be inserted into any one of the locking grooves 131 of the corresponding input gear 13, thereby locking the input gear 13. When the dumbbell body 1 is placed in the dumbbell body placement position 32, the lower end of the locking block 151 is pushed against by the dumbbell body placement position 32, prompting the locking portion 1511 to disengage upward from the aforementioned inserted locking groove 131, thereby releasing the lock on the input gear 13.

[0037] In a preferred example of the utility model, two weight plate storage positions 31 and a dumbbell body placement position 32 are formed on the upper surface 301 of the base 3, and two first output gears 41 are installed in the base 3 at the left and right sides corresponding to the dumbbell body placement position 32, and two openings 321 for exposing the two first output gears 41 are provided on the left and right sides of the dumbbell body placement position 32. When the dumbbell body 1 is placed in the dumbbell body placement position 32, the two input gears 13 are respectively meshed with the two first output gears 41 in parallel.

[0038] In a preferred example of the present utility model, the driving device 4 includes a knob 42 exposed outside the base 3, a first rotating shaft 43 connected to the knob 42 and extending into the base 3, a first bevel gear 44 mounted on the first rotating shaft 43, a second bevel gear 45 meshing with the first bevel gear 44, a second rotating shaft 46 axially penetrating the second bevel gear 45 and fixedly connected to the second bevel gear 45, two driving pulleys 47 respectively mounted on the left and right ends of the second rotating shaft 46, two driven pulleys 48 respectively coaxially arranged with the two first output gears 41, and two synchronous belts 49 respectively connecting the corresponding driving pulleys 47 and driven pulleys 48. When it is necessary to adjust the dumbbell weight, only need to manually rotate the knob 42, and then successively drive the two telescopic rods 11 to axially extend or retract through the first rotating shaft 43, the first bevel gear 44, the second bevel gear 45, the second rotating shaft 46, the two driving pulleys 47, the two synchronous belts 49, the two driven pulleys 48, the two first output gears 41, the two input gears 13, the transmission assembly 14 and the two second output gears 12, so as to connect or disconnect from the corresponding counterweights in the two groups of counterweights 2.

[0039] In other alternative examples of the present utility model, the knob 42 in the driving device 4 can also be replaced with a motor to form an electric driving structure.

[0040] In a preferred example of the present utility model, a U-shaped support 33 is further provided in the base 3. The U-shaped support 33 includes a bottom plate 331 fixedly connected to the bottom wall 302 of the base 3 and two side plates 332 vertically extending upward from the left and right sides of the bottom plate 331. The left and right ends of the second rotating shaft 46 are respectively installed at the front ends of the two side plates 332 through the first bearings 461, and the two first output gears 41 and the two driven pulleys 48 are respectively installed at the inner sides of the rear ends of the two side plates 332 through the two first support shafts 401 in a one-to-one correspondence.

[0041] Moreover, the two first support shafts 401 are respectively fixedly connected to the two side plates 332 through a connecting bolt 402 exposed to the opposite outer sides of the two side plates 332. The lower parts of the left and right sides of the dumbbell body 1 are respectively provided with a downward-opening limiting clip 16. When the dumbbell body 1 is placed on the dumbbell body placement position 32, the limiting clip 16 is sleeved on the exposed part 4021 of the corresponding connecting bolt 402, which can improve the stability of the dumbbell body 1 when placed on the dumbbell body placement position 32 and ensure the reliability of the meshing transmission between the two first output gears 41 and the two input gears 13.

[0042] In a preferred example of the present utility model, the driving device 4 further includes two synchronous belt tensioning mechanisms 50. Each of the two synchronous belt tensioning mechanisms 50 includes a sliding groove 501, a second support shaft 502, a nut 503, a tensioning wheel 504, and a limit screw 505. The sliding groove 501 is formed in the corresponding side plate 332 in the vertical direction. One end of the second support shaft 502 penetrates through the sliding groove 501 and the protruding end is connected to the nut 503. The tensioning wheel 504 is rotatably installed at the other end of the second support shaft 502, and the tensioning wheel 504 abuts against the outer side of the corresponding synchronous belt 49. The limit screw 505 is screwed into the bottom wall 302 of the base 3 and passes through the bottom plate 331 to abut against the lower side of the second support shaft 502. By screwing the limit screw 505, the vertical position of the second support shaft 502 and the tensioning wheel 504 thereon can be adjusted, thereby realizing the adjustment of the tension of the corresponding synchronous belt 49.

[0043] In a preferred example of the present utility model, the axes of the two telescopic rods 11 are on the same straight line. The two input gears 13 are respectively coaxially arranged with the two telescopic rods 11. The transmission assembly 14 includes a large bevel gear 141 coaxially arranged outside the corresponding input gear 13 and fixedly connected to the input gear 13, a small bevel gear 142 meshing with the large bevel gear 141, and a third rotating shaft 143 coaxially connecting the small bevel gear 142 and the corresponding second output gear 12. The two ends of the third rotating shaft 143 are respectively installed on the dumbbell body 1 through second bearings 1431.

[0044] In a preferred example of the present utility model, the outer surfaces of the two telescopic rods 11 are respectively provided with positioning grooves 112 extending axially. The inner walls on the left and right sides of the handle 1a are respectively provided with positioning ribs 1a1 cooperating with the corresponding positioning grooves 112, so as to ensure that the two telescopic rods 11 can only axially displace but not circumferentially rotate.

[0045] The above are only the preferred embodiments of the present utility model, and the scope of implementation of the present utility model cannot be limited thereby. That is, all simple equivalent changes and modifications made according to the scope of the patent application of the present utility model and the content of the utility model description still fall within the scope covered by the patent of the present utility model.

Claims

1. An adjustable weight dumbbell, comprising a dumbbell body, two sets of weight plates and a base, the base being provided with two weight plate storage positions distributed on the left and right for storing the two sets of weight plates respectively, and a dumbbell body placement position located between the two weight plate storage positions and for placing the dumbbell body, characterized in that: The base is also provided with two first output gears distributed on the left and right and a driving device for controlling the two first output gears to rotate synchronously; Two telescopic rods, two second output gears and two input gears are provided on the left and right sides of the dumbbell body. The two telescopic rods are respectively provided with racks extending along the length direction thereof. The two second output gears are respectively meshed with the racks on the two telescopic rods. The two input gears are respectively connected to the two second output gears through a transmission assembly. When the dumbbell body is placed in the dumbbell body placement position, the two input gears are respectively meshed with the two first output gears. At this time, the driving device can drive the two telescopic rods to extend axially from the left and right sides of the dumbbell body and connect with the corresponding weight plates in the two sets of weight plates, or retract axially from the left and right sides of the dumbbell body and disengage from the corresponding weight plates in the two sets of weight plates.

2. The adjustable weight dumbbell according to claim 1, wherein: Two elastic locking mechanisms cooperating with two input gears are also provided on the left and right sides of the dumbbell body. The two elastic locking mechanisms can lock the two input gears when the dumbbell body leaves the dumbbell body placement position, and can be pushed by the dumbbell body placement position to release the locking of the two input gears when the dumbbell body is placed in the dumbbell body placement position.

3. The adjustable weight dumbbell according to claim 2, wherein: A plurality of locking grooves are circumferentially arranged on the two input gears, and the two elastic locking mechanisms each include a locking block arranged on the outer side of the lower end of the corresponding input gear and a spring for causing the locking block to tend downward, the lower end of the locking block is exposed at the lower side of the dumbbell body, and a locking portion is arranged on the upper end of the locking block, which can be inserted into any locking groove of the corresponding input gear to lock the input gear. When the dumbbell body is placed in the dumbbell body placement position, the lower end of the locking block is pushed against by the dumbbell body placement position to cause the locking portion to disengage upward from the aforementioned inserted locking groove, thereby releasing the lock on the input gear.

4. An adjustable-weight dumbbell according to claim 1 or 2 or 3, characterized in that: The two weight plate storage positions and the dumbbell body placement position are formed on the upper surface of the base, the two first output gears are installed in the base at the left and right sides corresponding to the dumbbell body placement position, and the left and right sides of the dumbbell body placement position are provided with two openings for exposing the two first output gears, and when the dumbbell body is placed in the dumbbell body placement position, the two input gears are respectively meshed with the two first output gears in parallel.

5. The adjustable weight dumbbell according to claim 4, wherein: The driving device includes a knob exposed outside the base, a first rotating shaft connected to the knob and extending into the base, a first bevel gear installed on the first rotating shaft, a second bevel gear meshing with the first bevel gear, a second rotating shaft axially penetrating the second bevel gear and fixedly connected to the second bevel gear, two driving pulleys respectively installed at the left and right ends of the second rotating shaft, two driven pulleys respectively arranged coaxially with the two first output gears, and two synchronous belts respectively connected to the corresponding driving pulleys and driven pulleys.

6. An adjustable weight dumbbell according to claim 5, wherein: The base further is provided with a U-shaped support, and the U-shaped support includes a bottom plate fixedly connected to the bottom wall of the base and two side plates vertically extending upward from the left and right sides of the bottom plate. The left and right ends of the second rotating shaft are respectively installed at the front ends of the two side plates through first bearings. The two first output gears and the two driven pulleys are respectively installed at the inner sides of the rear ends of the two side plates through two first support shafts.

7. An adjustable weight dumbbell according to claim 6, wherein: The two first support shafts are respectively fixedly connected to the two side plates through a connecting bolt exposed to the opposite outer sides of the two side plates. The lower parts of the left and right sides of the dumbbell body are respectively provided with a downward-opening limiting clip. When the dumbbell body is placed at the dumbbell body placement position, the limiting clip is sleeved on the exposed part of the corresponding connecting bolt.

8. An adjustable weight dumbbell according to claim 6, characterized in that: The driving device further includes two synchronous belt tensioning mechanisms, and each of the two synchronous belt tensioning mechanisms includes a chute, a second support shaft, a nut, a tensioning wheel and a limiting screw. The chute is opened in the corresponding side plate in the up and down direction. One end of the second support shaft penetrates through the chute and the penetrating end is connected to the nut. The tensioning wheel is rotatably installed at the other end of the second support shaft, and the tensioning wheel abuts against the outer side of the corresponding synchronous belt. The limiting screw is screwed into the bottom wall of the base and passes through the bottom plate to abut against the lower side of the second support shaft.

9. An adjustable-weight dumbbell according to claim 1 or 2 or 3, characterized in that: The axes of the two telescopic rods are on the same straight line. The two input gears are respectively coaxially arranged with the two telescopic rods. The transmission assembly includes a large bevel gear coaxially arranged outside the corresponding input gear and fixedly connected to the input gear, a small bevel gear meshing with the large bevel gear, and a third rotating shaft coaxially connecting the small bevel gear and the corresponding second output gear. The two ends of the third rotating shaft are respectively installed on the dumbbell body through second bearings.

10. An adjustable-weight dumbbell according to claim 1 or 2 or 3, characterized in that: The dumbbell body includes a handle and two dumbbell heads arranged at both ends of the handle. A part of the two telescopic rods is located in the handle and the other part is located in the corresponding dumbbell head. The two second output gears and the two input gears are all located in the corresponding dumbbell head. The outer surfaces of the two telescopic rods are respectively provided with positioning grooves extending axially. The inner walls on the left and right sides of the handle are respectively provided with positioning ribs cooperating with the corresponding positioning grooves.

Images