Dumbbells with multi-stage weight adjustment

Abstract

We offer dumbbells with multi-stage weight adjustment. [Solution] The dumbbell rod assembly comprises a base, a dumbbell rod assembly, and multiple weight plates. The dumbbell rod assembly includes a rotating shaft 2, a rotation adjustment mechanism, and two positioning mechanisms. The product is provided with link discs 32 at both ends of the handle, and multiple annular link mechanisms are provided coaxially on the link discs. The annular link mechanisms have multiple retractable grooves and multiple protruding surfaces arranged alternately, and multiple stepped link plates 42 are provided within the positioning seat. The user links the rotation of the link disc via the handle, slides the link plates back and forth via the annular link mechanism, links the movement of the link block via the link plates, and achieves engagement or disengagement with the weight plates. Each link plate is driven by a corresponding annular link mechanism, and the movement between the link plates does not interfere with each other. The number and length of the retractable grooves and protruding surfaces are all different, and the frequency of movement of the corresponding link plates is also different. During the rotation process of the link disc, any combination of weight plates can be achieved, thereby increasing the number of weight levels of the dumbbell.

Description

Technical Field

[0001] The present invention belongs to the field of fitness equipment, and particularly relates to a dumbbell with adjustable weight in multiple stages.

Background Art

[0002] Dumbbells are extremely widely applied as fitness equipment. In order to meet the different intensity needs during a trainer's training, dumbbell products with adjustable weight have emerged in the market. This type of dumbbell includes a plurality of weight plates and a grip pipe. A plurality of rotary disks are provided on the grip pipe, and locking blocks are provided on each rotary disk. The user interlocks the rotation of the rotary disks through the grip pipe and realizes weight adjustment by fitting the locking blocks at different positions with the weight plates. In the process of weight adjustment, since the rotary disks rotate simultaneously and there are limitations on the installation position and number of the locking blocks, the selection of the weight plates can only be carried out sequentially from the lightest to the heaviest, and it is impossible to arbitrarily combine and select different weights. As a result, the number of selectable weight stages of the dumbbell is limited.

Summary of the Invention

Problems to be Solved by the Invention

[0003] In order to solve the above problems, the present invention proposes a dumbbell with adjustable weight in multiple stages.

Means for Solving the Problems

[0004] The technical solution adopted by the present invention is as follows. It includes a base and a dumbbell rod assembly. A plurality of weight plates are arranged on the base. The dumbbell rod assembly includes a rotating shaft, a rotation adjustment mechanism, and two positioning mechanisms. The two positioning mechanisms are provided on both sides of the rotation adjustment mechanism. It is a dumbbell with adjustable weight in multiple stages. An insertion groove is provided in the weight plate, and a locking groove is provided on the side wall of the insertion groove. The positioning mechanism includes a positioning seat, the positioning seat is fixedly connected to the rotating shaft, a positioning cavity is provided within the positioning seat, the positioning seat is provided with a plurality of slide holes and a plurality of positioning holes communicating with the positioning cavity, a plurality of link plates of different lengths are slidably connected within the slide holes, the link plates are arranged in a stepped pattern, a plurality of link blocks are slidably connected within the positioning cavity, a locking shaft is provided on the link block, the locking shaft is located within the positioning hole, a return member is provided between the link block and the positioning cavity, a first guide surface is provided on the link block, a second guide surface is provided on the inner end of the link plate, the first guide surface abuts against the second guide surface, The rotation adjustment mechanism comprises a handle and two link discs, the handle being rotatably connected to the rotation shaft, the two link discs being fixed to both ends of the handle, a stepped positioning mechanism being provided between the link discs and the positioning seat, a plurality of annular link mechanisms being provided coaxially on the link discs, the annular link mechanisms comprising a plurality of alternately arranged retraction grooves and a plurality of protruding surfaces, the annular link mechanisms each abutting against the outer ends of the link plates at different heights, the handle linking the rotation of the link discs, so that the retraction grooves and protruding surfaces alternately abut against the link plates, the link plates linking to reciprocate sliding in the axial direction of the rotation shaft, the locking shaft protruding from the positioning hole via the link block when the link plates move horizontally inward, the locking shaft engaging with the locking groove, and the locking shaft retracting into the positioning hole via the return member when the link plates move horizontally outward, releasing the engagement between the locking shaft and the engagement groove.

[0005] Furthermore, a plurality of support plates are provided within the positioning cavity at vertical intervals, the link plate is mounted on the support plates, a plurality of guide sleeves are fixed within the positioning cavity, and the link block is slidably connected within the guide sleeves.

[0006] Furthermore, a contact piece is provided on the outer end of the link plate, the contact piece is triangular in shape, and the adjacent contraction groove and the protruding surface are connected via an inclined surface, and the contact piece and the annular link mechanism maintain a contact state.

[0007] Furthermore, the step positioning mechanism comprises a positioning ball and a plurality of positioning grooves, an annular guide boss is provided on the positioning seat, the positioning ball is positioned within the annular guide boss, a spring is provided below the positioning ball, the positioning grooves are arranged in an annular shape on the link disk, the handle is linked to the rotation of the link disk, and thereby the positioning grooves alternately contact the positioning ball.

[0008] Furthermore, a protective cover is provided at the inner end of the positioning seat, a rotating chamber is provided inside the protective cover, a through hole is provided at the top of the rotating chamber, the link disc is located inside the rotating chamber, a plurality of step marks are provided on the circumferential side surface of the link disc, each of the step marks corresponds to a positioning groove, and the through hole is used to observe the step marks.

[0009] Furthermore, the annular link mechanism is provided to be integrally molded with the link disk, a rotating hole is provided in the link disk, the rotating shaft passes through the rotating hole, and the annular link mechanism is provided coaxially with the rotating hole.

[0010] Furthermore, a plurality of positioning bosses are provided at intervals on the side surface of the positioning seat, and a relief groove is provided in the weight plate, with the positioning bosses located within the relief groove between two adjacent weight plates. [Effects of the Invention]

[0011] This invention has the following beneficial effects compared to conventional technology. This invention features a handle with link discs at both ends, and multiple annular link mechanisms coaxially mounted on the link discs. Each annular link mechanism has multiple alternately arranged contraction grooves and multiple protruding surfaces. Multiple stepped link plates are provided within a positioning seat. The user controls the rotation of the link discs via the handle, reciprocating the link plates via the annular link mechanisms, and controlling the movement of the link blocks via the link plates to engage or disengage the weight plates. Each link plate is driven by its corresponding annular link mechanism, and the link plates do not interfere with each other. The number and length of the contraction grooves and protruding surfaces in each annular link mechanism are all different, allowing for the simultaneous driving of the movement of multiple link plates during the rotation of the link discs, enabling the combination of multiple sets of weight plates and thereby increasing the number of weight levels for the dumbbell. [Brief explanation of the drawing]

[0012] To more clearly describe embodiments of the present invention or technical solutions in the prior art, the following briefly describes the drawings that may be used to describe embodiments or the prior art. It is clear that the drawings described below represent only a few embodiments of the present invention, and those skilled in the art can obtain further drawings based on these without any creative work. [Figure 1] This is a schematic diagram of the overall structure according to the present invention. [Figure 2] This is a schematic diagram of the overall cross-sectional structure according to the present invention. [Figure 3] This is a schematic diagram of the first exploded structure of the dumbbell rod assembly according to the present invention. [Figure 4] This is a schematic diagram of the second exploded structure of the dumbbell rod assembly according to the present invention. [Figure 5] This is a schematic diagram of the exploded structure of the positioning mechanism according to the present invention. [Figure 6]This is a schematic diagram of the structure of a link disk according to the present invention. [Figure 7] This is a schematic diagram of the weight plate according to the present invention.

[0013] The realization of the objective, functional features, and advantages of this invention will be further explained by combining embodiments and referring to the drawings. [Modes for carrying out the invention]

[0014] The technical solutions in embodiments of the present invention will be clearly and completely described below with reference to the drawings of the embodiments of the present invention. Of course, the embodiments described are not all embodiments, but only a selection of embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments that those skilled in the art can obtain without creative work are all within the scope of the present invention.

[0015] This invention proposes a dumbbell with multi-stage weight adjustment, referring to Figures 1 and 2, comprising a base 1 and a dumbbell rod assembly, wherein a plurality of weight plates 11 are arranged on the base 1, the dumbbell rod assembly comprises a rotating shaft 2, a rotation adjustment mechanism 3 and two positioning mechanisms 4, the two positioning mechanisms 4 are provided on both sides of the rotation adjustment mechanism 3, the weight plates 11 are provided with insertion grooves 111, and locking grooves 112 are provided on the side walls of the insertion grooves 111, preferably two locking grooves 112 are provided symmetrically. Referring to Figures 2 and 5, the positioning mechanism 4 includes a positioning seat 41, which is fixedly connected to the rotating shaft 2, a positioning cavity 411 is provided within the positioning seat 41, the positioning seat 41 is provided with a plurality of slide holes 412 and a plurality of positioning holes 413 that communicate with the positioning cavity 411, the slide holes 412 are located on the inner end face of the positioning seat 41, the positioning holes 413 are located on the front and rear end faces of the positioning seat 41, the number of positioning holes 413 corresponds to the number of engagement grooves, a plurality of link plates 42 of different lengths are slidably connected within the slide holes 412, the link plates 42 are arranged in a stepped pattern, and a plurality of link blocks 43 slide within the positioning cavity 411 The link block 43 is provided with a locking shaft 431, the locking shaft 431 is located in the positioning hole 413, a return member is provided between the link block 43 and the positioning cavity 411, the return member may be a spring, the link block 43 is provided with a first guide surface 432, the link plate 42 is provided with a second guide surface 421 at its inner end, the first guide surface 432 abuts against the second guide surface 421, and in order to ensure the connection effect with the weight plate 11, it is preferable that the link blocks 43 of the same height are provided in pairs symmetrically, and the second guide surface 421 is provided in a number corresponding to the number of first guide surfaces 432. Referring to Figures 3 and 6, the rotation adjustment mechanism 3 comprises a handle 31 and two link discs 32, the handle 31 being rotatably connected to the rotation shaft 2, the two link discs 32 being fixed to both ends of the handle 31, a stepped positioning mechanism 4 being provided between the link discs 32 and the positioning seat 41, a plurality of annular link mechanisms being provided coaxially on the link discs 32, the annular link mechanisms comprising a plurality of alternately arranged contraction grooves 33 and a plurality of protruding surfaces 34, the contraction grooves being arc-shaped, the annular link mechanisms each abutting against the outer ends of the link plate 42 at different heights, and the positions of the contraction grooves 33 and protruding surfaces 34 in each set of annular link mechanisms being different.

[0016] The operating principle of this product is as follows. By rotating the handle 31, the user interlocks the rotation of the link disk 32. As a result, the contraction groove 33 and the protruding surface 34 alternately abut against the link plate 42, causing the link plate 42 to reciprocally slide in the axial direction of the rotating shaft 2. When the link plate 42 abuts against the protruding surface 34, as the link plate 42 moves horizontally into the positioning seat 41, the second guide surface 421 moves the two first guide surfaces 432 outward, and through the link block 43, the locking shaft 431 protrudes from the positioning hole 413. Consequently, the locking shaft 431 engages with the locking groove 112, thereby realizing the connection between the positioning seat 41 and the weight plate 11. When the link plate 42 moves from the protruding surface 34 to the contraction groove 33, the reset member contracts the locking shaft 431 into the positioning hole 413, and the two first guide surfaces 432 move the second guide surface 421. Thus, when the link plate 42 is moved horizontally outside the positioning seat 41, the engagement between the locking shaft 431 and the engagement groove is released.

[0017] In this dumbbell, the number and length arrangements of the contraction grooves 33 and protruding surfaces 34 in each set of annular link mechanisms are different. By modifying the specific arrangements of the contraction grooves 33 and protruding surfaces 34, the movement frequency of the corresponding link plate can be changed. The movement of each link plate 42 is independently controlled by the corresponding annular link mechanism. During the rotation process of the link disk 32, the movement of the link plate 42 at any position can be simultaneously driven, realizing combinations of weight plates 11 with large weight differences, thereby increasing the number of weight levels of the dumbbell. As the weight of the weight plate increases gradually, the number of corresponding contraction grooves 33 and protruding surfaces 34 decreases gradually. The number of protruding surfaces determines the number of times the weight plate can be combined and used. Taking this embodiment as an example, if there are 5 weight plates 11 on the side, 21 weight level selections can be provided, which is significantly improved compared with conventional products.

[0018] Referring to FIGS. 2 and 5, a plurality of support plates 44 are provided at intervals in the vertical direction within the positioning cavity 411. Since the link plate 42 is installed on the support plates 44, the long link plate 42 is always held horizontally, ensuring the stability of the interlocking effect between the link plate 42 and the link block 43. A plurality of guide sleeves 45 are further fixed within the positioning cavity 411. The internal cavity of the guide sleeve 45 communicates with the positioning hole 413, and the link block 43 is slidably connected within the guide sleeve 45.

[0019] Referring to FIGS. 5 and 6, a contact piece 422 is provided at the outer end of the link plate 42. The contact piece 422 is triangular. The adjacent shrinkage groove 33 and the protruding surface 34 are connected via an inclined surface. During the rotation of the link disk 32, it is ensured that the link plate 42 smoothly fits into the annular link mechanism.

[0020] Referring to FIGS. 5 and 6, the step positioning mechanism 4 includes a positioning ball 46 and a plurality of positioning concave grooves 321. An annular guide boss 414 is provided on the positioning seat 41. The positioning ball 46 is disposed within the annular guide boss 414, and a spring is provided below the positioning ball 46. The positioning concave grooves 321 are annularly arranged on the link disk 32. When the handle 31 interlocks the rotation of the link disk 32, the positioning concave grooves 321 alternately contact the positioning ball 46. The main function of the step positioning mechanism 4 is that after the step adjustment is completed, the position between the link disk 32 and the positioning seat 41 is relatively fixed. At the same time, the sound caused by the collision between the positioning ball 46 and the positioning concave grooves 321 can also indicate whether the user has reached the corresponding step.

[0021] Referring to Figure 3, a protective cover 47 is provided at the inner end of the positioning seat 41, a rotating chamber is provided inside the protective cover 47, a through hole 471 is provided at the top of the rotating chamber, the link disc 32 is located inside the rotating chamber, a plurality of step marks are provided on the circumferential side surface of the link disc 32, each of the step marks corresponds to the positioning groove 321, and the user can observe the current weight step mark through the through hole 471.

[0022] Referring to Figure 6, in order to reduce the difficulty of processing, the annular link mechanism is provided to be integrally molded with the link disc 32, a rotating hole 322 is provided in the link disc 32, the rotating shaft 2 passes through the rotating hole 322, the annular link mechanism is provided coaxially with the rotating hole 322, the protruding surface 34 is connected to the inner surface of the link disc 32 to form a large flat surface, the back of the flat surface can be made into a hollow structure, and the cost of production materials can also be reduced.

[0023] Referring to Figure 3, a plurality of positioning bosses 415 are provided at intervals on the side surface of the positioning seat 41, and a relief groove 113 is provided in the weight plate 11. The positioning bosses 415 are located within the relief groove 113 between two adjacent weight plates 11, and the positioning bosses 415 prevent the weight plate 11 from shaking during use, ensuring a good user experience.

[0024] The above are merely preferred embodiments of the present invention, and the scope of protection of the present invention is not limited to the above embodiments. Any technical solution based on the concept of the present invention falls within the scope of protection of the present invention. [Explanation of Symbols]

[0025] 1. Base, 11. Weight plate, 111. Insertion groove, 112. Locking groove, 113. Relief groove, 2. Rotating shaft, 3. Rotation adjustment mechanism, 31. Handle, 32. Link disc, 321. Positioning recess, 322. Rotating hole, 33. Contraction groove, 34. Protruding surface, 4. Positioning mechanism, 41. Positioning seat, 411. Positioning cavity, 412. Slide hole, 413. Positioning hole, 414. Annular guide boss, 415. Positioning boss, 42. Link plate, 421. Second guide surface, 422. Contact piece, 43. Link block, 431. Locking shaft, 432. First guide surface, 44. Support plate, 45. Guide sleeve, 46. Positioning ball, 47. Protective cover, 471. Through hole.

Claims

1. A multi-stage weight-adjustable dumbbell comprising a base and a dumbbell rod assembly, wherein a plurality of weight plates are arranged on the base, and the dumbbell rod assembly comprises a rotating shaft, a rotation adjustment mechanism and two positioning mechanisms, the two positioning mechanisms being located on both sides of the rotation adjustment mechanism, An insertion groove is provided in the weight plate, and a locking groove is provided on the side wall of the insertion groove. The positioning mechanism comprises a positioning seat, the positioning seat is fixedly connected to the rotating shaft, a positioning cavity is provided within the positioning seat, the positioning seat is provided with a plurality of slide holes and a plurality of positioning holes communicating with the positioning cavity, a plurality of link plates of different lengths are slidably connected within the slide holes, the link plates are arranged in a stepped pattern, a plurality of link blocks are slidably connected within the positioning cavity, a locking shaft is provided on the link block, the locking shaft is located within the positioning hole, a return member is provided between the link block and the positioning cavity, a first guide surface is provided on the link block, a second guide surface is provided on the inner end of the link plate, the first guide surface abuts against the second guide surface, The multi-stage weight adjustable dumbbell is characterized in that the rotation adjustment mechanism comprises a handle and two link discs, the handle being rotatably connected to the rotation shaft, the two link discs being fixed to both ends of the handle, a step positioning mechanism being provided between the link discs and the positioning seat, a plurality of annular link mechanisms being provided coaxially on the link discs, the annular link mechanisms comprising a plurality of alternately arranged contraction grooves and a plurality of protruding surfaces, the annular link mechanisms each abutting against the outer ends of the link plates at different heights, the handle coordinating the rotation of the link discs, as a result the contraction grooves and protruding surfaces alternately abutting against the link plates, the link plates coordinating to reciprocate sliding in the axial direction of the rotation shaft, when the link plates move horizontally inward, the locking shaft protrudes from the positioning hole via the link block, the locking shaft and the locking groove engage, and when the link plates move horizontally outward, the locking shaft is contracted into the positioning hole via the return member, the engagement between the locking shaft and the engagement groove is released.

2. A multi-stage weight adjustable dumbbell according to claim 1, characterized in that a plurality of support plates are provided in the positioning cavity at vertical intervals, the link plate is mounted on the support plates, a plurality of guide sleeves are further fixed in the positioning cavity, and the link block is slidably connected within the guide sleeves.

3. A multi-stage weight adjustable dumbbell according to claim 1, characterized in that a contact piece is provided on the outer end of the link plate, the contact piece is triangular in shape, the adjacent contraction groove and the protruding surface are connected via an inclined surface, and the contact piece and the annular link mechanism maintain a contact state.

4. The multi-stage weight adjustable dumbbell according to claim 1, characterized in that the stage positioning mechanism comprises a positioning ball and a plurality of positioning grooves, an annular guide boss is provided on the positioning seat, the positioning ball is positioned within the annular guide boss, a spring is provided below the positioning ball, the positioning grooves are arranged in an annular shape on the link disc, and the handle is linked to the rotation of the link disc, thereby the positioning grooves alternately contact the positioning ball.

5. A multi-stage weight adjustable dumbbell according to claim 4, characterized in that a protective cover is provided at the inner end of the positioning seat, a rotating chamber is provided inside the protective cover, a through hole is provided at the top of the rotating chamber, the link disc is located inside the rotating chamber, a plurality of step marks are provided on the circumferential side surface of the link disc, each of the step marks corresponds to a positioning groove, and the through hole is used to observe the step marks.

6. The multi-stage weight adjustable dumbbell according to claim 1, characterized in that the annular link mechanism is provided integrally with the link disk, a rotating hole is provided in the link disk, the rotating shaft passes through the rotating hole, and the annular link mechanism is provided coaxially with the rotating hole.

7. A multi-stage weight adjustable dumbbell according to claim 1, characterized in that a plurality of positioning bosses are provided at intervals on the side surface of the positioning seat, a relief groove is provided in the weight plate, and the positioning bosses are located within the relief groove between two adjacent weight plates.

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