Cam mechanism and dumbbell

Abstract

The first embodiment of the utility model discloses a cam mechanism, which is used in a dumbbell and comprises a driving wheel, a fixed disc and a pair of elastic clamping pins, the pair of elastic clamping pins is movably arranged in the fixed disc; the driving wheel is matched with the pair of elastic clamping pins, and the driving wheel rotates to drive the pair of elastic clamping pins to move linearly. The first embodiment of the utility model has the advantages of simple structure, small friction force and long service life. The dumbbell comprises the cam mechanism, the handle and the additional piece in the previous embodiment, the number of adjusting gears is large, adjusting is convenient, the additional piece and the cam mechanism are additionally arranged, and the adjustable gears of the dumbbell are further improved.

Description

Technical Field

[0001] The utility model relates to the technical field of dumbbells, in particular to a cam mechanism and a dumbbell. Background Art

[0002] Dumbbells are an auxiliary equipment for weightlifting and fitness exercises. They are smaller than barbells. The weights of light dumbbells are 6, 8, 12, 16 pounds, etc., and the weights of heavy dumbbells are 10, 15, 30 kilograms, etc. Therefore, they are favored by fitness enthusiasts. Because there is no sound during exercise, they are named dumbbells.

[0003] There are two main types of dumbbells in the prior art: one is a dumbbell with fixed weight, and the other is a dumbbell with adjustable weight; when the former dumbbell with fixed weight is used, a set of dumbbells of different weight specifications must be prepared to meet the needs of the trainee; the latter is deeply loved by sports trainees because the weight can be adjusted.

[0004] Generally, a dumbbell with adjustable weight is provided with multiple weight levels. During use, dumbbell plates can be added or subtracted by adjusting the extension and retraction of the dumbbell handle as needed, so that the dumbbell has different weights, which is convenient for use in different stages of exercise. However, the number of adjustable levels of the dumbbell is usually the number of dumbbell plates that can be installed on one side of the dumbbell, and the weight represented by each level is the sum of the weight of two dumbbell plates and the weight of the handle. The dumbbell with adjustable weight in this setting has the problem of a small number of adjustable levels. During use, it is easy to have the weight adjusted in each level to be too large, which exceeds the weight that the exerciser can bear each time, especially the weak female group, and thus cannot well meet the needs of the exerciser.

[0005] The patent document with the publication number CN215781228U discloses a dumbbell handle, dumbbell and dumbbell base, which relates to the technical field of fitness equipment, wherein a dumbbell handle comprises: a handle body, a gear rotating assembly, a planetary gear mechanism sleeved on one end of a gear shaft, and the other end of the gear shaft is nested in a first cavity; the inner walls of both ends of the second cavity of the gear shaft each have at least one first protrusion; a telescopic shaft, a threaded groove corresponding to the first protrusion is provided on the side wall of the telescopic shaft, a cam mechanism, a driving wheel and a driven wheel slidingly cooperate, an elastic member is provided on the side of the driven wheel away from the driving wheel, the driving wheel is sleeved on the end of the gear shaft, the driving wheel rotates under the drive of the gear shaft, and drives the driven wheel to do reciprocating linear motion along the axis direction of the gear shaft. The dumbbell handle of the utility model can realize the engagement and separation between the driven wheel and the additional sheet of the dumbbell, increase the number of gear adjustment, and effectively avoid the problem of affecting the exercise effect due to the excessive weight of each gear adjustment. However, the contact area between the driving wheel and the driven wheel in its cam mechanism is large, resulting in greater friction, which greatly reduces the service life. Summary of the invention

[0006] According to a first embodiment of the utility model, a cam mechanism is provided for use in a dumbbell, comprising:

[0007] A driving wheel, a fixed disc and a pair of elastic bayonet pins;

[0008] The pair of elastic bayonet pins are movably arranged in the fixed disc;

[0009] The driving wheel cooperates with the pair of elastic bayonet pins, and the rotation of the driving wheel can drive the pair of elastic bayonet pins to move linearly.

[0010] Furthermore, the driving wheel is evenly provided with at least two protrusions along the circumference.

[0011] Furthermore, a pair of first slide grooves are arranged on the fixed disc, and the pair of elastic bayonet pins correspond to the pair of first slide grooves one by one and are movably arranged in the corresponding first slide grooves. The pair of elastic bayonet pins can slide in the corresponding first slide grooves and protrude from the corresponding first slide grooves.

[0012] The cam mechanism according to the embodiment of the utility model has a simple structure, small friction and long service life.

[0013] According to the second embodiment of the utility model, a dumbbell is provided, comprising the cam mechanism and the handle of the first embodiment, wherein the handle comprises a first hollow shaft and a second hollow shaft, wherein the first hollow shaft is sleeved on the second hollow shaft and drives the second hollow shaft to rotate through a planetary gear mechanism, wherein the driving wheel is sleeved on the second hollow shaft and rotates with the second hollow shaft, wherein the fixed disc is connected to the planetary gear mechanism and does not rotate with the second hollow shaft, and further comprises:

[0014] A telescopic shaft, wherein a thread groove and a pair of second sliding grooves are arranged on the outer circumference of the telescopic shaft;

[0015] The second hollow shaft is sleeved on the telescopic shaft, and at least one first threaded protrusion is arranged in the second hollow shaft, the first threaded protrusion cooperates with the thread groove, and the second hollow shaft drives the telescopic shaft to reciprocate along the axial direction through the first threaded protrusion;

[0016] The additional sheet can be sleeved on the second hollow shaft, a pair of first openings are arranged on the additional sheet, the additional sheet and the cam mechanism are arranged adjacent to each other, and the pair of first openings and the pair of elastic bayonet pins correspond one to one.

[0017] Furthermore, the thread groove includes a plurality of flat thread grooves and a plurality of oblique thread grooves, and the plurality of flat thread grooves and the plurality of oblique thread grooves are alternately arranged and connected.

[0018] Furthermore, the circumferential angles corresponding to each of the flat thread grooves and each of the oblique thread grooves are the same, and the sum of the circumferential angles corresponding to all of the flat thread grooves and all of the oblique thread grooves is 360°.

[0019] The dumbbell according to the embodiment of the utility model has multiple adjustment gears and is easy to adjust. In addition, an additional sheet and a cam mechanism are added to further improve the adjustable gears of the dumbbell.

[0020] It is to be understood that both the foregoing general description and the following detailed description are exemplary, and are intended to provide further explanation of the technology as claimed. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a schematic diagram of a stereoscopic view of a dumbbell according to a second embodiment of the utility model;

[0022] Figure 2 for Figure 1 A top view of

[0023] Figure 3 for Figure 2 AA section view;

[0024] Figure 4 is a schematic diagram of a first internal structure according to a second embodiment of the utility model;

[0025] Figure 5 is a schematic diagram of a second internal structure according to a second embodiment of the utility model;

[0026] Figure 6 It is a schematic diagram of the matching relationship of the cam mechanism according to the first embodiment of the utility model;

[0027] Figure 7 It is a schematic diagram of the cooperation between the cam mechanism and the additional sheet according to the first embodiment of the utility model.

[0028] Figure 8 It is a schematic diagram of a telescopic shaft with a flat thread groove and an oblique thread groove according to a second embodiment of the utility model;

[0029] Fig. 9 It is a schematic diagram of a telescopic shaft without a flat thread groove according to the second embodiment of the utility model. DETAILED DESCRIPTION

[0030] The preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings to further illustrate the present invention.

[0031] First, combine Figures 5 to 7 The cam mechanism according to the embodiment of the utility model is described and is used in a dumbbell, and its application scenarios are very wide.

[0032] like Figures 5 to 7 As shown, the cam mechanism of the embodiment of the utility model is used in a dumbbell and comprises:

[0033] A driving wheel 11, a fixed disc 12 and a pair of elastic latches 13;

[0034] The pair of elastic latches 13 are movably disposed in the fixed disc 12;

[0035] The driving wheel 11 cooperates with the pair of elastic latches 13 , and the rotation of the driving wheel 11 can drive the pair of elastic latches 13 to move linearly.

[0036] Further, if Figures 5 to 7 As shown, in this embodiment, the driving wheel 11 is evenly provided with at least two protrusions 111 along the circumference.

[0037] Further, if Figure 6 As shown, in this embodiment, a pair of first slide grooves 121 are provided on the fixed disk 12, and the pair of elastic pins 13 correspond to the pair of first slide grooves 121 one by one and are movably arranged in the corresponding first slide grooves 121. The pair of elastic pins 13 can slide in the corresponding first slide grooves 121 and protrude from the corresponding first slide grooves 121.

[0038] The cam mechanism according to the embodiment of the utility model has a simple structure, small friction and long service life.

[0039] Secondly, if Figures 1 to 9 As shown, according to the second embodiment of the utility model, a dumbbell is provided, comprising the cam mechanism 1 and the handle 2 described in the first embodiment, the handle 2 comprising a first hollow shaft 21 and a second hollow shaft 22, the first hollow shaft 21 is sleeved on the second hollow shaft 22, and drives the second hollow shaft 22 to rotate through the planetary gear mechanism 3 (belonging to the prior art), the driving wheel 11 is sleeved on the second hollow shaft 22, and rotates with the second hollow shaft 22, the fixed disc 12 is connected to the planetary gear mechanism 3, and does not rotate with the second hollow shaft 22 (belonging to the prior art), and further comprises:

[0040] A telescopic shaft 4, wherein a thread groove 41 and a pair of second sliding grooves 42 are arranged on the outer circumference of the telescopic shaft 4;

[0041] The second hollow shaft 22 is sleeved on the telescopic shaft 4. At least one first threaded protrusion 221 is disposed in the second hollow shaft 22. The first threaded protrusion 221 cooperates with the thread groove 41. The second hollow shaft 22 drives the telescopic shaft 4 to reciprocate along the axial direction through the first threaded protrusion 221.

[0042] The additional sheet 5 can be sleeved on the second hollow shaft 22 . A pair of first openings 51 are provided on the additional sheet 5 . The additional sheet 5 and the cam mechanism 1 are arranged adjacent to each other. The pair of first openings 51 and the pair of elastic latches 13 correspond to each other one by one.

[0043] Further, if Figures 3-5 As shown in Figures 8 and 9, in this embodiment, the thread groove 41 includes a plurality of flat thread grooves 411 and a plurality of oblique thread grooves 412, and the plurality of flat thread grooves 411 and the plurality of oblique thread grooves 412 are arranged alternately and communicated with each other, so as to facilitate user operation. In use, the second hollow shaft 22 rotates, and when the first thread protrusion 221 passes through the oblique thread groove 412, the telescopic shaft 4 moves outward or inward by a certain length, and when the first thread protrusion 221 passes through the flat thread groove 411, the telescopic shaft 4 only rotates and does not extend or shorten.

[0044] Further, if Figure 8 As shown, in this embodiment, the circumferential angles corresponding to each of the flat thread grooves 411 and each of the oblique thread grooves 412 are the same, and the same rotation angle is set to facilitate user operation, and the sum of the circumferential angles corresponding to all of the flat thread grooves 411 and all of the oblique thread grooves 412 is 360°.

[0045] Working principle: Rotating the first hollow shaft 21 drives the second hollow shaft 22 to rotate, and the second hollow shaft 22 drives the driving wheel 11 to rotate. When the convex point 111 contacts the elastic latch 13, the elastic latch 13 is ejected, and the ejected part enters the first opening 51 of the additional sheet 5. At this time, when the user picks up the handle 2, the additional sheet 5 can be brought up; the driving wheel 11 continues to rotate, the convex point 111 is separated from the elastic latch 13, and the elastic latch 13 is reset due to the elastic force of the spring. At this time, when the user picks up the handle 2, the additional sheet 5 will remain on the dumbbell seat. When the second hollow shaft 22 rotates, it can simultaneously drive the telescopic shaft 4 to extend or shorten, so as to adjust the number of dumbbell sheets 6 brought up.

[0046] Above, refer to Figures 1 to 9 The invention discloses a dumbbell according to an embodiment of the utility model, which has multiple adjustment gears and is convenient to adjust. In addition, an additional sheet and a cam mechanism are added to further improve the adjustable gears of the dumbbell.

[0047] It should be noted that, in this specification, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprises..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0048] Although the content of the utility model has been described in detail through the above preferred embodiments, it should be appreciated that the above description should not be considered as a limitation of the utility model. After reading the above content, various modifications and substitutions of the utility model will be obvious to those skilled in the art. Therefore, the protection scope of the utility model should be limited by the attached claims.

Claims

1. A cam mechanism for a dumbbell, characterized in that: Include: A driving wheel, a fixed disc and a pair of elastic bayonet pins; The pair of elastic bayonet pins are movably arranged in the fixed disc; The driving wheel cooperates with the pair of elastic bayonet pins, and the rotation of the driving wheel can drive the pair of elastic bayonet pins to move linearly.

2. The cam mechanism according to claim 1, characterized in that: The driving wheel is evenly provided with at least two convex points along the circumference.

3. The cam mechanism according to claim 1, characterized in that: A pair of first slide grooves are arranged on the fixed disc, and the pair of elastic bayonet pins correspond to the pair of first slide grooves one by one and are movably arranged in the corresponding first slide grooves. The pair of elastic bayonet pins can slide in the corresponding first slide grooves and protrude from the corresponding first slide grooves.

4. A dumbbell, comprising the cam mechanism and handle according to any one of claims 1 to 3, wherein the handle comprises a first hollow shaft and a second hollow shaft, the first hollow shaft is sleeved on the second hollow shaft, and the second hollow shaft is driven to rotate through a planetary gear mechanism, the driving wheel is sleeved on the second hollow shaft and rotates with the second hollow shaft, the fixed disc is connected to the planetary gear mechanism and does not rotate with the second hollow shaft, and is characterized in that it also comprises: A telescopic shaft, wherein a thread groove and a pair of second sliding grooves are arranged on the outer circumference of the telescopic shaft; The second hollow shaft is sleeved on the telescopic shaft, and at least one first threaded protrusion is arranged in the second hollow shaft, the first threaded protrusion cooperates with the thread groove, and the second hollow shaft drives the telescopic shaft to reciprocate along the axial direction through the first threaded protrusion; An additional sheet, which can be sleeved on the second hollow shaft, is provided with a pair of first openings, the additional sheet and the cam mechanism are arranged adjacent to each other, and the pair of first openings correspond to the pair of elastic bayonet pins one by one.

5. The dumbbell according to claim 4, characterized in that: The thread grooves include a plurality of flat thread grooves and a plurality of oblique thread grooves, and the plurality of flat thread grooves and the plurality of oblique thread grooves are alternately arranged and communicated with each other.

6. The dumbbell according to claim 5, characterized in that: The circumferential angles corresponding to each of the flat thread grooves and each of the oblique thread grooves are the same, and the sum of the circumferential angles corresponding to all of the flat thread grooves and all of the oblique thread grooves is 360°.

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