Telescopic shaft and dumbbell

Abstract

The utility model discloses a telescopic shaft which is used in a dumbbell, the telescopic shaft is provided with thread grooves along the circumference, the thread grooves comprise a plurality of flat thread grooves and a plurality of inclined thread grooves, and the plurality of flat thread grooves and the plurality of inclined thread grooves are alternately arranged and are communicated with each other; a pair of first sliding grooves are formed in the opposite sides of the telescopic shaft in the axial direction. The utility model further discloses a dumbbell which comprises the telescopic shaft of the embodiment. The utility model has the advantages of multiple adjustment gears, convenience in adjustment, easiness in sensing the adjustment angle by a user and accuracy in adjustment.

Description

Technical Field

[0001] The utility model relates to the technical field of dumbbells, in particular to a telescopic shaft 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 publication number CN216497246U discloses a dumbbell with adjustable gear, including a dumbbell body; the dumbbell body includes a gripping sleeve, and ends arranged on both sides of the gripping sleeve; the gripping sleeve can rotate circumferentially relative to at least a part of the end; two telescopic shafts are axially movably penetrated in the gripping sleeve, and the telescopic shafts and the gripping sleeve are connected by a thread-like connection, and the ends of the telescopic shafts are in a chamber inside the end; when the gripping sleeve rotates circumferentially, the two telescopic shafts can be driven to move axially relative to or away from each other; the ends of the telescopic shafts can extend out of the ends to plug in dumbbell plates, and / or the telescopic shafts can act on the elastic pin assembly inside the chamber to make the ends of the elastic pin assembly extend out of the ends to plug in dumbbell plates. The gripping sleeve in this scheme is the gripping part when lifting the dumbbell; and when the dumbbell weight needs to be adjusted, it only needs to rotate the gripping sleeve to adjust it, which can be operated with one hand and does not need to change the operating position, which is very convenient.

[0006] The patent document with publication number CN216319739U discloses an adjustable dumbbell, including a dumbbell body and dumbbell plates that can be cumulatively attached to the two ends of the dumbbell body, the dumbbell body including a grip and mounting parts arranged at the two ends of the grip for connecting the dumbbell plates, and also including a first telescopic rod and a second telescopic rod for hanging the dumbbell plates, the first telescopic rod and the second telescopic rod extending through the grip, and a spiral transmission member is fixedly connected to the two ends of the grip respectively, the first telescopic rod and the second telescopic rod are respectively connected to the spiral transmission members at the two ends of the grip through spiral pairs with opposite rotation directions. The utility model arranges an independent spiral transmission member, and the spiral transmission member is fixedly connected to the two ends of the grip to form a spiral pair connection with the first telescopic rod and the second telescopic rod, thereby eliminating the need to form a thread in the inner cavity of the grip, reducing the process difficulty and improving the production efficiency.

[0007] However, the threaded grooves on the surface of the telescopic shaft (or the first / second telescopic rod) in the above two patents make it impossible for the user to perceive the adjustment angle when adjusting the number of dumbbell plates, which easily leads to over-adjustment or under-adjustment. Summary of the invention

[0008] According to the first embodiment of the utility model, a telescopic shaft is provided for use in a dumbbell. The telescopic shaft is provided with a thread groove along the circumference. The thread groove includes a plurality of flat thread grooves and a plurality of oblique thread grooves. The plurality of flat thread grooves and the plurality of oblique thread grooves are alternately arranged and connected. A pair of first sliding grooves are provided on opposite sides of the telescopic shaft along the axial direction.

[0009] Furthermore, the circumferential angles corresponding to each flat thread groove and each oblique thread groove are the same, and the sum of the circumferential angles corresponding to all flat thread grooves and all oblique thread grooves is 360°.

[0010] The telescopic shaft according to the embodiment of the utility model has multiple adjustment gears, and the user can easily feel the adjustment angle, and the adjustment is precise.

[0011] According to the second embodiment of the utility model, a dumbbell is further provided, comprising the telescopic shaft and the handle of the first embodiment, the handle comprising a first hollow shaft and a second hollow shaft, the first hollow shaft is sleeved on the second hollow shaft, and can drive the second hollow shaft to rotate through a planetary gear mechanism (belonging to the prior art), the second hollow shaft is sleeved on the telescopic shaft, 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; it also comprises:

[0012] A first cam mechanism, the first cam mechanism comprises a first driving wheel and a first driven wheel, the first driving wheel and the first driven wheel are slidably matched, a first elastic member is arranged on a side of the first driven wheel away from the first driving wheel, the first driving wheel is sleeved on the second hollow shaft sleeve and can rotate with the second hollow shaft sleeve, and the rotation of the first driving wheel can drive the first driven wheel to reciprocate linearly;

[0013] The additional sheet can be sleeved on the second hollow shaft, a pair of first openings are arranged on the additional sheet, and the additional sheet and the first cam mechanism are arranged adjacent to each other.

[0014] Furthermore, a plurality of first protrusions are arranged on the outer side of the first driving wheel along the circumference, and a plurality of corresponding second protrusions are arranged on a side of the first driven wheel adjacent to the first driving wheel.

[0015] Furthermore, a first support member is disposed on each side of the first driven wheel, and the first support member corresponds to the first opening.

[0016] Furthermore, it also includes: a limit plate, which is sleeved on the first hollow shaft but does not move with the first hollow shaft. A pair of second openings are set on the limit plate, and the pair of second openings correspond to the pair of first support members one by one respectively. The pair of first support members are set in the corresponding second openings, and the second openings are used to make the corresponding first support members reciprocate linearly.

[0017] According to the third embodiment of the utility model, a dumbbell is further provided, comprising the telescopic shaft and the handle of the first embodiment, the handle comprising a first hollow shaft and a second hollow shaft, the first hollow shaft is sleeved on the second hollow shaft and can drive the second hollow shaft to rotate, the second hollow shaft is sleeved on the telescopic shaft, 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; it also comprises:

[0018] The second cam mechanism comprises a second driving wheel, a fixed disc and a pair of elastic bayonet pins, the second driving wheel and the pair of elastic bayonet pins cooperate with each other; the fixed disc is sleeved on the second hollow shaft and does not rotate with the second hollow shaft; the pair of elastic bayonet pins are slidably arranged in the fixed disc; the second driving wheel is sleeved on the second hollow shaft sleeve and can rotate with the second hollow shaft sleeve, and the rotation of the second driving wheel can drive the pair of elastic bayonet pins to move linearly;

[0019] 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 second cam mechanism are arranged adjacently, and the pair of first openings and the pair of elastic bayonet pins correspond one to one.

[0020] Furthermore, a pair of second slide grooves are arranged on the fixed disc, and a pair of elastic latches correspond to the pair of second slide grooves one by one and are movably arranged in the corresponding second slide grooves.

[0021] Furthermore, the second driving wheel is evenly provided with at least two protrusions along the circumference, so as to better drive the action of a pair of elastic latches.

[0022] 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.

[0023] 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

[0024] Figure 1 It is a perspective view according to the first embodiment of the utility model;

[0025] Figure 2 It is a partial schematic diagram of a stereogram according to a second embodiment of the utility model;

[0026] Figure 3 for Figure 2 Left view of

[0027] Figure 4 for Figure 3 AA section view;

[0028] Figure 5 for Figure 4 A magnified image of point A;

[0029] Figure 6 It is a schematic diagram of the internal structure according to the second embodiment of the utility model;

[0030] Figure 7 It is a schematic diagram of an exploded view of a first partial structure according to a second embodiment of the utility model;

[0031] Figure 8 is a schematic diagram of an exploded view of a second partial structure according to a second embodiment of the utility model;

[0032] Fig. 9 is a schematic diagram of a stereogram according to a third embodiment of the utility model;

[0033] Fig.10 for Fig. 9 A top view of

[0034] Fig.11 for Fig.10 AA section view;

[0035] Fig.12 is a schematic diagram of the cooperation relationship of the second cam mechanism according to the third embodiment of the utility model;

[0036] Fig.13 It is a schematic diagram of the cooperation between the second cam mechanism and the additional sheet according to the third embodiment of the utility model. DETAILED DESCRIPTION

[0037] 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.

[0038] First, combine Figure 1 The telescopic shaft according to the first embodiment of the utility model is described and is used in dumbbells, and has a wide range of application scenarios.

[0039] like Figure 1 As shown, according to the first embodiment of the utility model, a telescopic shaft is provided, which is used in a dumbbell. The telescopic shaft 1 is provided with a thread groove 11 along the circumference, and the thread groove 11 includes a plurality of flat thread grooves 111 and a plurality of oblique thread grooves 112. The plurality of flat thread grooves 111 and the plurality of oblique thread grooves 112 are alternately arranged and connected to each other, so as to facilitate user operation. A pair of first sliding grooves are provided on opposite sides of the telescopic shaft 1 along the axial direction.

[0040] Further, if Figure 1 As shown, in this embodiment, the circumferential angles corresponding to each flat thread groove 111 and each oblique thread groove 112 are the same, and the same rotation angle is set to facilitate user operation, and the sum of the circumferential angles corresponding to all flat thread grooves 111 and all oblique thread grooves 112 is 360°.

[0041] Above, refer to Figure 1 The telescopic shaft according to the embodiment of the utility model is described, which has multiple adjustment gears, and the user can easily perceive and determine the adjustment angle, and the adjustment is precise.

[0042] Secondly, if Figures 1 to 8 As shown, according to the second embodiment of the utility model, a dumbbell is also provided, comprising the telescopic shaft 1 and the handle 2 of 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 can drive the second hollow shaft 22 to rotate, the second hollow shaft 22 is sleeved on the telescopic shaft 1, at least one first threaded protrusion 221 is arranged in the second hollow shaft 22, the first threaded protrusion 221 cooperates with the thread groove 11, the second hollow shaft 22 drives the telescopic shaft 1 to reciprocate along the axial direction through the first threaded protrusion 221, in use, the second hollow shaft 22 rotates, when the first threaded protrusion 221 passes through the oblique thread groove 112, the telescopic shaft 1 moves outward or inward by a certain length, when the first threaded protrusion 221 passes through the flat thread groove 111, the telescopic shaft 1 only rotates without extending or shortening; it also comprises:

[0043] The first cam mechanism 3 comprises a first driving wheel 31 and a first driven wheel 32. The first driving wheel 31 and the first driven wheel 32 are slidably matched. A first elastic member (not shown in the figure) is arranged on a side of the first driven wheel 32 away from the first driving wheel 31. The first driving wheel 31 is sleeved on the second hollow shaft 22 and can rotate with the second hollow shaft 22. The rotation of the first driving wheel 31 can drive the first driven wheel 32 to reciprocate linearly.

[0044] The additional sheet 4 can be sleeved on the second hollow shaft 22, and a pair of first openings 41 are provided on the additional sheet 4. The additional sheet 4 and the first cam mechanism 3 are arranged adjacent to each other. In the initial position, the first elastic member is located between the additional sheet 4 and the first driven wheel 32; the additional sheet 4 is provided outside a certain number of dumbbell sheets 6 to further improve the adjustable gear of the dumbbell.

[0045] Further, if Figure 7-8 As shown, in this embodiment, a plurality of first protrusions 311 are provided along the circumference of the outer side of the first driving wheel 31 , and a plurality of corresponding second protrusions 321 are provided on a side of the first driven wheel 32 adjacent to the first driving wheel 31 .

[0046] Further, if Figure 7-8 As shown, in this embodiment, a first support member 33 is provided on each side of the first driven wheel 32, and the first support member 33 corresponds to the first opening 41. When the first driving wheel 31 rotates to make the first protrusion 311 gradually contact the corresponding second protrusion 321, the driven wheel gradually moves outward in a straight line, so that the first support member 33 enters the corresponding first opening 41 on the additional sheet 4. At this time, when the user picks up the handle 2, the additional sheet 4 can be brought up; when the first protrusion 311 is located between the corresponding second protrusions 321, due to the elastic force of the first elastic member, the driven wheel moves inward in a straight line, and the first support member 33 is separated from the corresponding first opening 41. At this time, when the user picks up the handle 2, the additional sheet 4 will remain on the dumbbell seat. When the second hollow shaft 22 rotates, it can simultaneously drive the telescopic shaft 1 to extend or shorten, so as to adjust the number of dumbbell sheets 6 brought up.

[0047] Further, if Figure 7 As shown, in this embodiment, it also includes: a limit plate 34, the limit plate 34 is sleeved on the first hollow shaft 21, but does not move with the first hollow shaft 21, a pair of second openings 341 are provided on the limit plate 34, the pair of second openings 341 respectively correspond to the pair of first support members 33, the pair of first support members 33 are arranged in the corresponding second openings 341, and the second openings 341 are used to make the corresponding first support members 33 reciprocate linearly.

[0048] Secondly, if Figure 1 , 9As shown in Figure 13, according to the third embodiment of the utility model, a dumbbell is also provided, comprising the telescopic shaft 1 and the handle 2 of 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 can drive the second hollow shaft 22 to rotate, the second hollow shaft 22 is sleeved on the telescopic shaft 1, at least one first threaded protrusion 221 is arranged in the second hollow shaft 22, the first threaded protrusion 221 cooperates with the thread groove 11, and the second hollow shaft 22 drives the telescopic shaft 1 to reciprocate along the axial direction through the first threaded protrusion 221; in use, the second hollow shaft 22 rotates, and when the first threaded protrusion 221 passes through the oblique thread groove 112, the telescopic shaft moves outward or inward by a certain length, and when the first threaded protrusion 221 passes through the flat thread groove 111, the telescopic shaft only rotates and does not extend or shorten; it also comprises:

[0049] The second cam mechanism 5 comprises a second driving wheel 51, a fixed disc 52 and a pair of elastic bayonet pins 53. The second driving wheel 51 cooperates with the pair of elastic bayonet pins 53. The fixed disc 52 is sleeved on the second hollow shaft 22 and does not rotate with the second hollow shaft 22. The pair of elastic bayonet pins 53 are slidably arranged in the fixed disc 52. The second driving wheel 51 is sleeved on the second hollow shaft 22 and can rotate with the second hollow shaft 22. The rotation of the second driving wheel 51 can drive the pair of elastic bayonet pins 53 to move linearly.

[0050] The additional sheet 4 can be sleeved on the second hollow shaft 22 . A pair of first openings 41 are provided on the additional sheet 4 . The additional sheet 4 and the second cam mechanism 5 are arranged adjacent to each other. The pair of first openings 41 and the pair of elastic latches 53 correspond to each other one by one.

[0051] Further, if Figures 12-13 As shown, in this embodiment, a pair of second slide grooves 521 are provided on the fixed disc 52 , and a pair of elastic latches 53 correspond to the pair of second slide grooves 521 one by one and are movably disposed in the corresponding second slide grooves 521 .

[0052] Further, if Figures 12-13 As shown, in this embodiment, the second driving wheel 51 is evenly provided with at least two protrusions 511 along the circumference (the number of protrusions 511 is greater than or equal to the number of elastic latches); here, three protrusions 511 are set, and when the protrusions 511 contact the elastic latches 53, the elastic latches 53 are ejected, and the ejected part enters the first opening 41 of the additional sheet 4. At this time, when the user picks up the handle 2, the additional sheet 4 can be brought up; the second driving wheel 51 continues to rotate, and the protrusions 511 are disengaged from the elastic latches 53, and the elastic latches 53 are reset due to the spring force. At this time, when the user picks up the handle 2, the additional sheet 4 will remain on the dumbbell seat. When the second hollow shaft 22 rotates, it can simultaneously drive the telescopic shaft 1 to extend or shorten, so as to adjust the number of dumbbell sheets 6 brought up.

[0053] Above, refer to Figures 1 to 13 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.

[0054] 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 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.

[0055] 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 dumbbell, comprising a telescopic shaft and a handle, wherein the telescopic shaft is provided with a thread groove along the circumference, the thread groove comprises a plurality of flat thread grooves and a plurality of oblique thread grooves, the plurality of flat thread grooves and the plurality of oblique thread grooves are arranged alternately and are connected; the telescopic shaft is provided with a pair of first slide grooves along the axial opposite sides; the handle comprises a first hollow shaft and a second hollow shaft, the first hollow shaft is sleeved on the second hollow shaft and can drive the second hollow shaft to rotate, the second hollow shaft is sleeved on the telescopic shaft, at least one first threaded protrusion is provided 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; characterized in that Also includes: A first cam mechanism, wherein the first cam mechanism comprises a first driving wheel and a first driven wheel, wherein the first driving wheel and the first driven wheel are slidably matched, a first elastic member is arranged on a side of the first driven wheel away from the first driving wheel, the first driving wheel is sleeved on the second hollow shaft sleeve and can rotate with the second hollow shaft sleeve, and the rotation of the first driving wheel can drive the first driven wheel to reciprocate linearly; An additional sheet, which can be sleeved on the second hollow shaft, is provided with a pair of first openings, and is arranged adjacent to the first cam mechanism.

2. The dumbbell according to claim 1, characterized in that: A plurality of first protrusions are arranged along the circumference of the outer side of the first driving wheel, and a plurality of corresponding second protrusions are arranged on a side of the first driven wheel adjacent to the first driving wheel.

3. The dumbbell according to claim 1, characterized in that: A first support member is disposed on each side of the first driven wheel, and the first support member corresponds to the first opening.

4. A dumbbell, comprising a telescopic shaft and a handle, wherein the telescopic shaft is provided with a thread groove along the circumference, the thread groove comprises a plurality of flat thread grooves and a plurality of oblique thread grooves, the plurality of flat thread grooves and the plurality of oblique thread grooves are alternately arranged and communicated; the telescopic shaft is provided with a pair of first slide grooves along the axial opposite sides; the handle comprises a first hollow shaft and a second hollow shaft, the first hollow shaft is sleeved on the second hollow shaft and can drive the second hollow shaft to rotate, the second hollow shaft is sleeved on the telescopic shaft, at least one first threaded protrusion is provided 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; characterized in that Also includes: The second cam mechanism comprises a second driving wheel, a fixed disc and a pair of elastic bayonet pins, wherein the second driving wheel cooperates with the pair of elastic bayonet pins; the fixed disc is sleeved on the second hollow shaft and does not rotate with the second hollow shaft; the pair of elastic bayonet pins are slidably arranged in the fixed disc; the second driving wheel is sleeved on the second hollow shaft sleeve and can rotate with the second hollow shaft sleeve, and the rotation of the second driving wheel can drive the pair of elastic bayonet pins to move linearly; 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 second 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 second driving wheel is evenly provided with at least two protrusions along the circumference.

6. The dumbbell according to claim 4, characterized in that: A pair of second slide grooves are arranged on the fixed disc, and the pair of elastic latches correspond to the pair of second slide grooves one by one and are movably arranged in the corresponding second slide grooves.

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