Telescopic adjusting mechanism and weightlifting equipment comprising same

Abstract

The utility model provides a telescopic adjusting mechanism and weightlifting equipment comprising the telescopic adjusting mechanism, the telescopic adjusting mechanism comprises a rotating sleeve, a fixed sleeve and two telescopic shafts, the rotating sleeve is arranged on the periphery of the fixed sleeve, and the telescopic shafts are arranged in the fixed sleeve; the side wall of the rotating sleeve is provided with two spiral guide grooves which are oppositely arranged in a staggered mode. The side wall of the fixed sleeve is provided with two linear track grooves which are oppositely arranged in a staggered mode. Protruding parts are arranged at the ends, close to each other, of the telescopic shafts, and the two protruding parts are arranged in a staggered mode. The protruding part is provided with guide shafts, and the two guide shafts are inserted into the two rail grooves and the two guide grooves. The maximum extending length of the handle can be increased, when the weight lifting device is applied to the weight lifting device with the weight stacks capable of being adjusted, more weight stacks can be lifted, and the maximum weight lifting weight of the weight lifting device is improved.

Description

Technical Field

[0001] This utility model relates to the field of weightlifting equipment technology, and in particular to a telescopic adjustment mechanism and a weightlifting device including the telescopic adjustment mechanism. Background Technology

[0002] Existing weightlifting equipment, such as dumbbells and barbells, has a similar structure, with weight plates at both ends of the handle. Furthermore, the handle length of existing weightlifting equipment is generally fixed. To increase or decrease the lifting weight, the weight plates at both ends of the handle must be manually adjusted, which is inconvenient. Therefore, adjustable-length handles have emerged on the market. These handles allow for adjustment of the extension length at both ends, thereby raising different numbers of weight plates and adjusting the lifting weight. However, the maximum extension length of current adjustable-length handles is relatively small, limiting the maximum number of weight plates that can be raised, thus limiting the maximum lifting weight of the weightlifting equipment.

[0003] Therefore, there is a need to provide an improved technical solution that addresses the shortcomings of the existing technology. Utility Model Content

[0004] The purpose of this invention is to provide a telescopic adjustment mechanism that can increase the maximum extension length of the handle. When applied to weightlifting equipment with an adjustable number of counterweights, it can lift more counterweights and increase the maximum lifting weight of the weightlifting equipment.

[0005] Another objective of this invention is to provide a weightlifting device that includes the aforementioned telescopic adjustment mechanism, which can lift a greater number of counterweights and increase the maximum lifting weight of the weightlifting device.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A telescopic adjustment mechanism includes a rotating sleeve, a fixed sleeve, and two telescopic shafts. The rotating sleeve is rotatably disposed on the outer periphery of the fixed sleeve, and the telescopic shafts are disposed opposite to each other inside the fixed sleeve and can slide along the axial direction of the fixed sleeve.

[0008] The side wall of the rotating sleeve is provided with two opposing spiral guide grooves, and the two guide grooves are staggered in the axial direction of the rotating sleeve at their ends that are close to each other.

[0009] The side wall of the fixed sleeve is provided with two straight track grooves arranged opposite each other, and the two track grooves are staggered in the axial direction of the fixed sleeve at their ends that are close to each other.

[0010] The telescopic shafts are provided with protrusions extending outward along the axial direction of the telescopic shafts at their respective ends, and the protrusions of the two telescopic shafts are staggered in the axial direction of the fixed sleeve; the protrusions are provided with guide shafts extending outward along the radial direction of the telescopic shafts, and the two guide shafts are respectively inserted into the two track grooves and the two guide grooves in sequence.

[0011] According to one embodiment of the present invention, the telescopic shaft is provided with a first ball-head plunger arranged radially along the telescopic shaft, and the side wall of the fixed sleeve is provided with a plurality of first positioning holes corresponding to the first ball-head plunger, so that the ball head of the first ball-head plunger is normally located in the first positioning hole; the first positioning holes are evenly distributed along the axial direction of the fixed sleeve.

[0012] According to one embodiment of the present invention, a handle sleeve is fitted around the outer periphery of the rotating sleeve, and a rotating disk is fixedly provided at both ends of the handle sleeve. The rotating disk is fixedly connected to the end of the rotating sleeve. A positioning ring is provided inside the rotating disk, and a second positioning hole is provided on the outer side of the positioning ring, which is evenly distributed along the circumference of the positioning ring.

[0013] The two ends of the fixed sleeve are located outside the rotating sleeve, and each end of the fixed sleeve is fitted with a mounting plate. The mounting plate is provided with a second ball-head plunger corresponding to the second positioning hole. The second ball-head plunger is arranged in a direction parallel to the axial direction of the mounting plate, so that the ball head of the second ball-head plunger is normally located in the second positioning hole.

[0014] According to one embodiment of the present invention, an annular drive plate is provided on the inner edge of the rotating disk, and the outer edge of the drive plate is wavy, forming crests and troughs; adjustment grooves are provided on both sides of the interior of the mounting disk in a direction parallel to the axial direction of the mounting disk, and adjustment plates that can slide along the adjustment grooves are provided in the adjustment grooves; a spring is provided between one end of the adjustment plate and the inner end of the adjustment groove, so that the other end of the adjustment plate abuts against the outer edge of the drive plate; a hanging plate extending radially along the mounting disk is provided on the outer side of the adjustment plate, and the mounting disk is provided with... The mounting plate has a corresponding groove that extends in a direction parallel to the axial direction of the mounting plate. The mounting plate passes through the groove, and its end is located outside the groove. The bottom of the mounting plate has a semi-circular semi-adjustable plate. The inner sides of both ends of the semi-adjustable plate have hook grooves corresponding to the groove. When the end of the adjusting plate abuts against the crest or trough of the outer edge of the drive plate, the mounting plate slides into the hook groove. When the end of the adjusting plate abuts against the trough or crest of the outer edge of the drive plate, the mounting plate slides out of the hook groove.

[0015] According to one embodiment of the present invention, a semi-fixed piece is fixedly provided on the top of the mounting plate, and the semi-fixed piece is connected to the two ends of the semi-adjusting piece to form a ring.

[0016] According to one embodiment of the present invention, the top of the telescopic shaft is provided with a plurality of positioning grooves, which are evenly distributed along the axial direction of the telescopic shaft; the top of both ends of the fixed sleeve are provided with notches corresponding to the positioning grooves; the mounting plate is provided with a vertically sliding locking plate, the locking plate has a locking hole in the middle and is fitted onto the end of the fixed sleeve; the top of the locking hole of the locking plate normally passes through the notch and is located in the positioning groove; the bottom of the mounting plate is provided with a locking groove corresponding to the locking plate, and the bottom of the locking plate passes through the locking groove and is located outside the mounting plate.

[0017] This utility model also provides a weightlifting device, including the above-mentioned telescopic adjustment mechanism and a plurality of counterweight plates; the counterweight plates are provided with a through hole in the middle for the telescopic shaft to pass through.

[0018] According to one embodiment of the present invention, a dovetail-shaped slot is provided on one side of the counterweight plate, and a block corresponding to the shape of the slot is provided on the other side of the counterweight plate; an mounting plate is fixedly provided on the outside of the mounting plate, and an mounting groove or mounting block corresponding to the slot or block is provided on the outside of the mounting plate.

[0019] According to one embodiment of the present invention, the slot includes a first segment and a second segment connected sequentially from top to bottom, the first segment being V-shaped and the second segment being rectangular.

[0020] According to one embodiment of the present invention, the weightlifting equipment further includes a base; the inner walls on both sides of the base are provided with limiting grooves or limiting blocks corresponding to the locking blocks or slots of the counterweight plates;

[0021] And / or, the top surface of the base is provided with a cuboid-shaped unlocking block;

[0022] And / or, the base is provided with rotatable handles on the outer sides at both ends.

[0023] Compared with the prior art, the advantages and beneficial effects of the embodiments of this utility model are as follows:

[0024] The telescopic adjustment mechanism and weightlifting equipment provided in this embodiment of the invention, due to the staggered arrangement of the two guide shafts, can increase the maximum extension length of the telescopic shaft. That is, a handle of equal length increases the maximum extension length of the telescopic shaft. When used on dumbbells or barbells with adjustable weight plates, this increases the number of adjustable weight plates, thereby adjusting the adjustable weight of the dumbbells or barbells. Conversely, with the same maximum extension length of the telescopic shaft, the handle of this invention can be shortened. When used on dumbbells or barbells with adjustable weight plates, the weight of the dumbbells or barbells can be closer to the center of gravity, reducing the torque on the weight plates at both ends. This allows for better lateral balance when holding the dumbbells or lifting the barbell during exercise. Attached Figure Description

[0025] The accompanying drawings, which form part of this specification, are used to provide a further understanding of this utility model. The illustrative embodiments of this utility model and their descriptions are used to explain this utility model and do not constitute an undue limitation of this utility model. Wherein:

[0026] Figure 1 This is a schematic diagram of the telescopic adjustment mechanism provided in an embodiment of the present utility model;

[0027] Figure 2 An assembly diagram of the telescopic adjustment mechanism provided in an embodiment of this utility model;

[0028] Figure 3 A schematic diagram of the rotating sleeve of the telescopic adjustment mechanism provided in an embodiment of this utility model;

[0029] Figure 4 A schematic diagram of the structure of the fixing sleeve of the telescopic adjustment mechanism provided in an embodiment of this utility model;

[0030] Figure 5 A schematic diagram of the telescopic shaft of the telescopic adjustment mechanism provided in an embodiment of this utility model;

[0031] Figure 6 This is a schematic diagram of the structure of a telescopic adjustment mechanism provided in another embodiment of the present invention;

[0032] Figure 7 A schematic diagram of the handle sleeve of a telescopic adjustment mechanism provided in another embodiment of the present utility model;

[0033] Figure 8 A schematic diagram of the rotating disk of a telescopic adjustment mechanism provided in another embodiment of the present utility model;

[0034] Figure 9 A schematic diagram of the rotating disk of the telescopic adjustment mechanism provided in another embodiment of the present utility model at another angle;

[0035] Figure 10 A schematic diagram of the mounting plate of the telescopic adjustment mechanism provided in another embodiment of this utility model;

[0036] Figure 11 A schematic diagram of the mounting plate of the telescopic adjustment mechanism provided in another embodiment of the present utility model from another angle;

[0037] Figure 12 A schematic diagram of the structure of the telescopic adjustment mechanism provided in another embodiment of the present utility model;

[0038] Figure 13 A structural schematic diagram of the telescopic adjustment mechanism provided in yet another embodiment of the present invention from another angle;

[0039] Figure 14 A structural schematic diagram of another angle of the telescopic adjustment mechanism provided in another embodiment of the present utility model;

[0040] Figure 15 An assembly diagram of the telescopic adjustment mechanism provided in another embodiment of the present utility model;

[0041] Figure 16 A schematic diagram of the external appearance of a telescopic adjustment mechanism provided in another embodiment of the present utility model;

[0042] Figure 17 A schematic diagram of the structure of the telescopic adjustment mechanism provided in another embodiment of this utility model;

[0043] Figure 18 This is a schematic diagram of the structure of the weightlifting equipment provided in an embodiment of the present utility model;

[0044] Figure 19 A schematic diagram of the structure of the counterweight plate of the lifting equipment provided in this embodiment of the utility model;

[0045] Figure 20 A schematic diagram of the counterweight plate of the lifting equipment provided in an embodiment of this utility model from another angle;

[0046] Figure 21 A schematic diagram of the assembly of the counterweight plates of the lifting equipment provided in this embodiment of the utility model;

[0047] Figure 22 A cross-sectional view of the counterweight plate of the lifting equipment provided in an embodiment of this utility model;

[0048] Figure 23 A schematic diagram of the structure of the base of the weightlifting equipment provided in this embodiment of the utility model;

[0049] Figure 24 This is a schematic diagram of the base of the weightlifting equipment provided in an embodiment of the present utility model from another angle.

[0050] Figure 25 A schematic diagram showing the usage state of the base of the weightlifting equipment provided in this embodiment of the utility model.

[0051] Explanation of reference numerals in the attached figures:

[0052] 1. Rotating sleeve; 11. Guide groove; 12. Positioning groove; 13. Shaft retaining ring; 2. Fixed sleeve; 21. Track groove; 22. First positioning hole; 23. Limiting groove; 24. Limiting hole; 25. Shaft retaining ring; 26. Notch; 3. Telescopic shaft; 31. Protrusion; 32. Guide shaft; 321. Rotating component; 33. First ball-head plunger; 34. Positioning groove; 4. Handle sleeve; 41. Fixed groove; 5. Rotating disk; 51. Positioning ring; 511. Second positioning hole; 52. Rib; 53. Drive plate; 6. Mounting disk; 60. Locking plate; 601. Locking hole; 602. Locking groove; 603. Spring; 604. 61. Locking plate; 62. Second ball-head plunger; 63. Threaded positioning hole; 64. Blind hole; 65. Adjusting groove; 66. Adjusting plate; 67. Hanging plate; 68. Rolling bearing; 69. Spring; 70. Slide groove; 61. Semi-adjusting plate; 62. Hanging groove; 73. Semi-fixed plate; 74. Counterweight plate; 75. Through hole; 76. Slot; 77. First section; 78. Second section; 79. Limiting stop; 70. Locking block; 71. Guide slope; 72. Mounting plate; 73. Iron plate; 84. Plastic layer; 85. Base; 86. Limiting groove; 87. Unlocking block; 88. Handle; 89. Storage slot; 80. Support plate; 81. Suction cup. Detailed Implementation

[0053] The present invention will now be described in detail with reference to the accompanying drawings and embodiments. Various examples are provided by way of explanation of the present invention and not by way of limitation. In fact, those skilled in the art will recognize that modifications and variations can be made to the present invention without departing from the scope or spirit of the invention. For example, a feature shown or described as part of one embodiment may be used in another embodiment to produce yet another embodiment. Therefore, it is desirable that the present invention encompass such modifications and variations that fall within the scope of the appended claims and their equivalents.

[0054] In the description of this utility model, the terms "first," "second," and similar words do not indicate any order, quantity, or importance, but are only used to distinguish different components. Words such as "comprising" or "including" mean that the element or object preceding the word covers the element or object listed after the word and its equivalents, without excluding other elements or objects. Terms such as "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," and "bottom" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and do not require that this utility model be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on this utility model. The terms "connected," "linked," and "set up" used in this utility model should be interpreted broadly. For example, they can refer to a fixed connection or a detachable connection; a direct connection or an indirect connection through intermediate components; a wired connection, a radio connection, or a wireless communication signal connection. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances.

[0055] like Figures 1-5 As shown, this embodiment of the utility model provides a telescopic adjustment mechanism, including a rotating sleeve 1, a fixed sleeve 2, and two telescopic shafts 3. The rotating sleeve 1 is rotatably disposed on the outer periphery of the fixed sleeve 2, and the telescopic shafts 3 are disposed opposite each other inside the fixed sleeve 2 and can slide along the axial direction of the fixed sleeve 2. The side wall of the rotating sleeve 1 is provided with two opposing spiral guide grooves 11, and the ends of the two guide grooves 11 that are close to each other are staggered in the axial direction of the rotating sleeve 1. The side wall of the fixed sleeve 2 is provided with two opposing linear track grooves 21, and the ends of the two track grooves 21 that are close to each other are staggered in the axial direction of the fixed sleeve 2. The ends of the two telescopic shafts 3 that are close to each other are provided with protrusions 31 extending outward along the axial direction of the telescopic shafts 3, and the protrusions 31 of the two telescopic shafts 3 are staggered in the axial direction of the fixed sleeve 2. The protrusion 31 is provided with a guide shaft 32 extending radially outward along the telescopic shaft 3, and the two guide shafts 32 are staggered in the axial direction of the fixed sleeve 2. The two guide shafts 32 are respectively inserted into the two track grooves 21 and the two guide grooves 11 in sequence.

[0056] When the telescopic adjustment mechanism provided in this embodiment is used, rotating the rotating sleeve 1 will drive the guide shaft 32 to move along the axial direction of the fixed sleeve 2 in the track groove 21 of the fixed sleeve 2. This will cause the two telescopic shafts 3 to slide in opposite directions within the fixed sleeve 2 to extend or retract, thereby obtaining a handle with an adjustable length. Because the ends of the two telescopic shafts 3 are provided with axially extending protrusions 31, and the two protrusions 31 are staggered, and the guide shaft 32 is provided on the protrusions 31, the two guide shafts 32 are also staggered. This increases the maximum extension length of the telescopic shafts 3 (the extension length of the telescopic shafts 3 is the distance between the guide shafts 32 and the outer end of the track groove 21). That is, the handle of the same length increases the maximum extension length of the telescopic shafts 3. When used on dumbbells or barbells with adjustable weight plates, the number of adjustable weight plates can be increased (the number of weight plates is adjusted by the extension length of the telescopic shafts 3), thereby adjusting the adjustable weight of the dumbbells or barbells. Conversely, under the condition that the maximum extension length of the telescopic shafts 3 is the same, the handle of this utility model can be shortened. When used on dumbbells or barbells with adjustable weight plates, the weight of the dumbbells or barbells can be closer to the center of gravity, reducing the torque of the weight plates at both ends. When holding the dumbbells or lifting the barbell, the left and right balance can be better maintained. Furthermore, the first ends of the two guide grooves 11 on the rotating sleeve 1 of this utility model are staggered, and the third ends of the two track grooves 21 on the fixed sleeve 2 are staggered, which can cooperate with the staggered guide shafts 32 to increase the maximum extension length of the telescopic shaft 3.

[0057] like Figures 3-5 As shown, in a preferred embodiment of this utility model, the first ends of the two guide grooves 11 are located on opposite sides of the rotating sleeve 1, i.e., the angle difference between them is 180 degrees. Similarly, the two track grooves 21 are located on opposite sides of the fixed sleeve 2, and the angle difference between them is also 180 degrees; the two guide shafts 32 are located within the two track grooves 21, and therefore the angle difference between them is also 180 degrees.

[0058] like Figure 2 , Figure 5 As shown, in order to reduce friction, in one embodiment of the present invention, the end of the guide shaft 32 is provided with a rotating component 321, such as a rolling bearing, a copper sleeve, a roller, etc. The rotating component 321 rolls against the side wall of the guide groove 11 and the track groove 21, making the sliding of the telescopic shaft 3 smoother.

[0059] like Figure 2 , Figure 4As shown, in order to ensure the accurate sliding distance of the telescopic shaft 3 and allow the user to easily determine the extension distance of the telescopic shaft 3, in one embodiment of this utility model, the telescopic shaft 3 is provided with a first ball-head plunger 33 (or spring ball) arranged radially along the telescopic shaft 3. The side wall of the fixed sleeve 2 is provided with a plurality of first positioning holes 22 corresponding to the first ball-head plunger 33. The plurality of first positioning holes 22 are evenly distributed along the axial direction of the fixed sleeve 2, and the ball head of the first ball-head plunger 33 is normally located in the first positioning hole 22. Each first positioning hole 22 is equivalent to multiple stops, corresponding to the extension distance of the telescopic shaft 3. When the telescopic shaft 3 is in a certain position, rotating the rotating sleeve 1 drives the telescopic shaft 3 to slide within the fixed sleeve 2. This requires overcoming the spring force of the first ball plunger 33, causing the ball head of the first ball plunger 33 to be pushed back into its interior. After the telescopic shaft 3 slides a fixed distance (the distance between the two first positioning holes 22), the ball head of the first ball plunger 33 falls back into the next first positioning hole 22 and serves as a positioning element, remaining in that position while producing a metallic clicking sound. The user can determine how many fixed distances the telescopic shaft 3 has moved by rotating the rotating sleeve 1 and by the clicking sound. Furthermore, when the user does not operate the rotating sleeve 1, the telescopic shaft 3 can remain in a specific position due to the positioning between the ball head of the first ball plunger 33 and the first positioning hole 22, preventing the telescopic shaft 3 from moving. When applied to dumbbells or barbells with adjustable weight plates, each position can be accurately positioned, preventing axial swaying of the telescopic shaft 3 due to clearance and avoiding the problem of weight plates falling off or pulling up the next dumbbell plate. Preferably, to improve the movement accuracy and positioning precision of the telescopic shaft 3, there are two first ball-head plungers 33, symmetrically arranged, or the first ball-head plungers 33 are double ball-head plungers; correspondingly, the fixed sleeve 2 has first positioning holes 22 on both opposite sides.

[0060] like Figure 6As shown, to further improve the movement accuracy and positioning precision of the telescopic shaft 3, in one embodiment of this utility model, a handle sleeve 4 is fitted around the outer periphery of the rotating sleeve 1. A rotating disk 5 is fixedly mounted at both ends of the handle sleeve 4, and the rotating disk 5 is fixedly connected to the end of the rotating sleeve 1. A positioning ring 51 is provided inside the rotating disk 5, and second positioning holes 511 are evenly distributed circumferentially around the outer side of the positioning ring 51. Both ends of the fixed sleeve 2 are located outside the rotating sleeve 1, and a mounting disk 6 is fitted at both ends of the fixed sleeve 2. The mounting disk 6 is provided with a second ball-head plunger 61 corresponding to the second positioning hole 511. The second ball-head plunger 61 is arranged in a direction parallel to the axial direction of the mounting disk 6, so that the ball head of the second ball-head plunger 61 is normally located within the second positioning hole 511. In this embodiment, each second positioning hole 511 corresponds to the length extended by the telescopic shaft 3, forming different stops. When the handle sleeve 4 rotates, it functions similarly to the interaction between the first ball plunger 33 and the first positioning hole 22. Similarly, the second ball plunger 61 and the second positioning hole 511 ensure precise positioning during gear adjustment and produce a clicking sound when the gear is engaged. Applied to dumbbells or barbells with adjustable weight plates, this allows for accurate positioning of each gear, preventing axial swaying of the telescopic shaft due to clearances, thus preventing weight plates from falling off and lifting the next dumbbell plate. Preferably, there are multiple second ball plungers 61, evenly spaced around the circumference of the mounting plate 6. Furthermore, the first positioning hole 22 and the second positioning hole 511 correspond, ensuring that when the ball head of the first ball plunger 33 is in one of the first positioning holes 22, the ball head of the second ball plunger 61 is simultaneously in the corresponding second positioning hole 511, further enhancing gear positioning accuracy. The second ball plunger 61 is arranged axially rather than radially because: if it were radially arranged, the elasticity would be too low when it engages with the plastic rotating disk 5, resulting in a lack of tactile feedback (the feeling of preventing the handle sleeve 4 from rotating to other positions). Conversely, excessive elasticity would partially lift the plastic rotating disk 5, affecting its appearance. Furthermore, plastic parts develop grooves over time due to wear, reducing the tactile feedback. In this embodiment, the second ball plunger 61 is axially arranged, engaging with the iron positioning ring 51, providing tactile feedback even with low elasticity; the rotating disk 5's outer shell remains undeformed, preserving its appearance; and the iron-on-iron material combination prevents rapid wear.

[0061] like Figure 7As shown, in one embodiment of this utility model, the handle sleeve 4 has two elongated fixing slots 41 at both ends to securely position with the key in the through hole in the center of the rotating disk 5, achieving synchronous rotation and improving processing efficiency. Furthermore, for anti-slip purposes, the surface of the handle sleeve 4 where the user grips can be knurled to obtain a fishnet-shaped anti-slip texture, an elongated anti-slip texture, or various customized anti-slip patterns, etc., with the texture varying according to market demand. Additionally, the surface of the handle sleeve 4 can be chrome-plated with iron and covered with rubber or plastic, etc., allowing for anti-slip treatment of the handle sleeve 4 with various materials according to market needs.

[0062] like Figure 8 , Figure 9 As shown, in one embodiment of this utility model, the rotating disk 5 is shaped like a weight, with evenly distributed numbered positions on its inclined surface. Combined with the second positioning hole 511 and the second ball-head plunger 61, each rotation angle changes the position. Applied to dumbbells or barbells with adjustable counterweights, the number of positions can be changed according to the number of positions and the weight being adjusted. Specifically, a 22.5-degree rotation of the handle sleeve 4 corresponds to one position, with a total of 16 positions. The values ​​on the positions can be adjusted according to the total weight requirement. Rotating the rotating sleeve 1 via the handle sleeve 4 drives the telescopic shaft 3 to move linearly through the spiral guide groove 11. In this embodiment, each 22.5-degree rotation of the handle sleeve 4 causes a single telescopic shaft 3 to move linearly forward and backward by the thickness of one counterweight, thus adding or removing counterweights.

[0063] Furthermore, such as Figure 6 , Figures 8-9 As shown, the rotating disk 5 has a key at one end facing the handle sleeve 4 for positioning and connecting with the fixing slot 41 at the end of the handle sleeve 4, which serves to rotate and position the handle sleeve 4. The other end has a key for positioning and connecting with the positioning slot 12 at the end of the rotating sleeve 1, which serves to position and position the rotating sleeve 1 radially. The rotating sleeve 1 also has a shaft retaining ring 13 at its end for axial positioning of the rotating disk 5 and the positioning ring 51. Preferably, there are two positioning slots 12 at the end of the rotating sleeve 1, with an angle difference of 180 degrees (i.e., opposite to each other), allowing for interchangeability of the left and right molds. Furthermore, the rotating disk 5 has evenly distributed ribs 52 inside, which can support and fix the structure of the rotating disk 5, and also provide axial positioning for the positioning ring 51, as well as allow it to be inserted into the groove on the inner side of the positioning ring 51 to position its rotation direction, so that it can rotate synchronously with the rotating disk 5.

[0064] like Figure 4 , Figure 6 , Figures 10-11As shown, in one embodiment of this utility model, the mounting plate 6 is disc-shaped. The mounting plate 6 has a central hole with a key for positioning with the fixing sleeve 2. Correspondingly, the fixing sleeve 2 has limiting slots 23 at both ends, distributed 180 degrees opposite each other, allowing the mounting plate 6 to be used laterally, reducing production costs and improving installation efficiency. Additionally, the outer end of the mounting plate 6 has two symmetrical threaded positioning holes 62 arranged radially along the mounting plate 6 for installation and positioning with the fixing sleeve 2. Correspondingly, the fixing sleeve 2 also has corresponding limiting holes 24 at both ends for bolt-fixed connection. Furthermore, the end of the fixing sleeve 2 is provided with a shaft retaining ring 25 to limit the mounting plate 6 axially. Further, the mounting plate 6 has a circular blind hole 63 for installing the second ball-head plunger 61.

[0065] When the telescopic adjustment mechanism of this utility model is applied to dumbbells or barbells with adjustable weight plates, in order to make the weight adjustment of each level more precise, in one embodiment of this utility model, a half-adjustment plate (weighing half the weight of a single weight plate) is added. For example, if each weight plate weighs 2 kg, and existing dumbbells or barbells with adjustable weight plates increase or decrease the weight by 4 kg each time (adding or removing one weight plate at each end), then in this embodiment, the weight increase or decrease each time is the weight of one weight plate (i.e., adding or removing half the weight of one weight plate at each end). Specifically, as... Figures 12-15 As shown, the inner edge of the rotating disk 5 is provided with an annular drive plate 53, and the outer edge of the drive plate 53 is wavy, forming crests and troughs. The mounting disk 6 has adjustment grooves 64 on both sides inside, arranged in a direction parallel to the axial direction of the mounting disk 6. An adjustment plate 65, which can slide along the adjustment groove 64, is provided within the adjustment groove 64. A spring 66 is provided between one end of the adjustment plate 65 and the inner end of the adjustment groove 64, so that the other end of the adjustment plate 65 abuts against the outer edge of the drive plate 53. A hanging plate 651 extending radially along the mounting disk 6 is provided on the outer side of the adjustment plate 65. The mounting disk 6 has corresponding sliding grooves 67 on both sides, extending in a direction parallel to the axial direction of the mounting disk 6. The hanging plate 651 passes through the sliding groove 67, and its end is located outside the sliding groove 67. The bottom of the mounting plate 6 is provided with a semi-circular semi-adjustable plate 68. The inner sides of both ends of the semi-adjustable plate 68 are provided with a mounting groove 681 corresponding to the sliding groove 67. When the end of the adjusting plate 65 abuts against the crest or trough of the outer edge of the drive plate 53, the mounting plate 651 slides into the mounting groove 681. When the end of the adjusting plate 65 abuts against the trough or crest of the outer edge of the drive plate 53, the mounting plate 651 slides out of the mounting groove 681.

[0066] In this embodiment, when the rotating disk 5 rotates, the crests and troughs of the outer edge of the drive plate 53 cause the adjusting plate 65 to reciprocate axially, which in turn drives the hanging plate 651 to reciprocate axially, allowing it to slide into and out of the mounting groove 681 of the half-adjusting piece 68. When the hanging plate 651 slides into the mounting groove 681, the half-adjusting piece 68 is connected to the telescopic adjustment mechanism; when the hanging plate 651 slides out of the mounting groove 681, the half-adjusting piece 68 is not connected to the telescopic adjustment mechanism. At this time, for each rotation of the rotating disk 5, the telescopic shaft 3 extends or retracts by half the thickness of the counterweight piece, while the drive plate 53 completes one crest and trough transition, and the adjusting plate 65 reciprocates once along the axial direction of the mounting disk 6 (i.e., the transition of sliding into and out of the mounting groove 681). For example, the thickness of the counterweight plate is 13 mm, the rotating disk 5 rotates 22.5 degrees for each adjustment step, and the telescopic shaft 3 moves in and out 6.5 mm. Each counterweight plate weighs 2 kg, and the weight of the half-adjustment plate 68 is half that of the counterweight plate, i.e., 1 kg. Assuming the weight of the lifting equipment is 10 kg, the hanging plate 651 does not slide into the mounting slot 681 (i.e., it does not carry the half-adjustment piece 68). The end of the telescopic shaft 3 extends into the outermost counterweight piece by half its thickness. Rotating the handle sleeve 4 one stop forward causes the telescopic shaft 3 to extend outward by half the thickness of the counterweight piece. The number of counterweight pieces carried by the telescopic adjustment mechanism remains unchanged, but the weight of two half-adjustment pieces 68, i.e., 2 kg, will increase. Continuing to rotate one stop forward, the telescopic shaft will extend into the next counterweight piece by half its thickness, thus adding the weight of two counterweight pieces. However, at the same time, the hanging plate 651 slides out of the mounting slot 681, reducing the weight of two half-adjustment pieces 68. The same principle applies to rotating in the opposite direction, ensuring that the weight adjusted by each rotation is the weight of two half-adjustment pieces 68, achieving fine adjustment of the weight to meet the user's needs.

[0067] Specifically, the semi-adjustable piece 68 is semi-circular in shape and wraps around the outer periphery of the mounting plate 6. To achieve integration of the counterweight and the telescopic adjustment mechanism, a semi-fixed piece 69 is fixedly provided on the top of the mounting plate 6. When the telescopic adjustment mechanism carries the semi-adjustable piece 68, the semi-fixed piece 69 connects with both ends of the semi-adjustable piece 68 to form a ring. One side of the semi-adjustable piece 68 and the semi-fixed piece 69 is a bevel, smoothly transitioning with the bevel of the rotating disk 5. The manufacturing process of the semi-adjustable piece 68 and the semi-fixed piece 69 can be adjusted according to market requirements, such as casting, sheet metal processing, or injection molding. Preferably, the semi-adjustable piece 68 and the semi-fixed piece 69 are designed with beveled cuts at the semi-circular interface, which allows the semi-adjustable piece 68 to separate smoothly from the mounting plate 6. Furthermore, there is a raised ring at the outer end of the mounting plate 6, and the inner walls of the semi-adjustable piece 68 and the semi-fixed piece 69 are provided with annular grooves corresponding to the raised ring, which can provide axial positioning for the semi-adjustable piece 68 and the semi-fixed piece 69. In addition, the semi-fixed plate 69 can also serve the following functions: 1. Increase the counterweight to change the weight of the lifting equipment; 2. A pointer indicator can be set in the middle to cooperate with the gear numbers on the rotating disk 5 to serve as a gear indicator.

[0068] To reduce friction, the end of the adjusting plate 65 is provided with a rolling bearing 652 for abutting against the outer edge of the drive plate 53.

[0069] like Figure 5 , Figure 11 , Figure 17As shown, to prevent axial movement of the telescopic shaft 3 during use and ensure safe operation, in one embodiment of this invention, the top of the telescopic shaft 3 is provided with several positioning grooves 34, which are evenly distributed along the axial direction of the telescopic shaft 3. The top of both ends of the fixing sleeve 2 are provided with notches 26 corresponding to the positioning grooves 34. The mounting plate 6 is provided with a vertically sliding locking plate 60, which has a locking hole 601 in its center and is fitted onto the end of the fixing sleeve 2. The top of the locking hole 601 of the locking plate 60 normally passes through the notch 26 and is located within the positioning grooves 34. The bottom of the mounting plate 6 is provided with a locking groove 602 corresponding to the locking plate 60, and the bottom of the locking plate 60 passes through the locking groove 602 and is located outside the mounting plate 6. When the telescopic shaft 3 is adjusted to the predetermined length, the locking plate 60, under the action of gravity, allows the top of its locking hole 601 to fall into the positioning groove 34 of the telescopic shaft 3 and the notch 26 of the fixing sleeve 2, preventing the telescopic shaft 3 from moving axially. After the telescopic adjustment mechanism is used, it is placed on the ground or a special base with a protrusion corresponding to the locking plate 60. The locking plate 60 at the bottom of the mounting plate 6 is lifted, and the top of the locking hole 601 of the locking plate 60 separates from the positioning groove 34 and the notch 26, allowing the telescopic shaft 3 to readjust its length. Preferably, to ensure the locking effect, a spring 603 is provided between the top of the locking plate 60 and the top of the mounting plate 6, which normally presses the locking plate 60 down, preventing the locking plate 60 from unlocking from the telescopic shaft 3 when the telescopic adjustment mechanism is flipped, thus preventing the telescopic shaft 3 from moving axially. Furthermore, to improve the locking effect, the top of the locking hole 601 of the locking plate 60 protrudes downward to form a locking piece 604, which corresponds to the shape of the positioning groove 34. The locking plate 60 cooperates with the spring 603 mounted on the mounting plate 6. Under the elastic force of the spring 603, the locking piece 604 of the locking plate 60 is locked in the positioning groove 34 of the telescopic shaft 3, achieving a self-locking function and gear locking. For example, after the weightlifting equipment has adjusted the number of counterweights, the length of the telescopic shaft 3 can be automatically locked after it is lifted from the base, preventing the counterweights from falling off due to the rotation of the handle sleeve 4 during movement.

[0070] like Figure 18 As shown, this utility model also provides a lifting device, including the aforementioned telescopic adjustment mechanism and a plurality of counterweight plates 7. (As shown...) Figures 19-22 As shown, the counterweight plate 7 has a through hole 71 in the middle for the telescopic shaft 3 to pass through. The weightlifting device can be a dumbbell or a barbell. By adjusting the length of the telescopic shaft 3, the number of counterweight plates 7 hanging on the telescopic shaft 3 can be adjusted, thereby adjusting the weight of the weightlifting device.

[0071] like Figures 19-22As shown, in one embodiment of this utility model, one side of the counterweight 7 is provided with a dovetail-shaped groove 72, and the other side of the counterweight 7 is provided with a locking block 73 corresponding to the shape of the groove 72. A mounting plate 74 is fixedly provided on the outer side of the mounting plate 6. The outer side of the mounting plate 74 is provided with a mounting groove or mounting block corresponding to the locking block 73 or the groove 72, for connection with each counterweight 7. In this embodiment, the mounting plate 74 is fixedly connected to the telescopic adjustment mechanism. Each counterweight 7 and the mounting plate 74 are interconnected axially on the telescopic shaft 3. When the telescopic shaft 3 carries a certain number of counterweights 7, the telescopic shaft 3 limits each counterweight 7 radially. The mounting plate 74, the groove 72, and the locking block 73 of the counterweight 7 can limit each counterweight 7 axially, ensuring the connection stability between each counterweight 7 and the telescopic adjustment mechanism. In addition, the mounting plate 74 also has the following functions: 1. The maximum and minimum total weight of the lifting equipment can be changed by altering the weight of the mounting plate 74; 2. The mounting plate 74, combined with the semi-adjustable plate 68 and semi-fixed plate 69, forms a whole, improving aesthetics and coordination; 3. The telescopic adjustment mechanism and the counterweight plate 7 are connected by the mounting plate 74. If different weights of counterweight plates 7 need to be replaced, the same handle can be used, and only the mounting plate 74 needs to be replaced for connection and use. The mounting plate 74, semi-fixed plate 69, and semi-adjustable plate 68 adopt a method of wrapping around the handle mounting plate 6, making the appearance more integrated, improving the coordination and aesthetics of the appearance, and also allowing the weight to be moved towards the center of gravity. The small distance between the inner sides of the left and right counterweight plates 7 improves the left and right balance of the lifting equipment during use. The counterweight plate 7 of the weightlifting equipment provided in this embodiment of the utility model has the functions of preventing detachment and loosening. The cooperation between the slot 72 and the block 73 of the counterweight plate 7 and the cooperation between the telescopic shaft 3 and the through hole 71 of the counterweight plate 7 realizes the positioning of 6 degrees of freedom: the cooperation between the slot 72 and the block 73 of the counterweight plate 7 realizes the positioning of 4 degrees of freedom in the longitudinal and transverse directions; the cooperation between the telescopic shaft 3 and the through hole 71 of the counterweight plate 7 realizes the positioning of 2 degrees of freedom in the vertical direction.

[0072] like Figures 10-11 As shown, in one embodiment of this utility model, the side of the mounting plate 6 is provided with bolt holes for connecting with the mounting piece. Additionally, the bottom of the mounting piece 74 is provided with a slot corresponding to the locking groove 602, allowing the locking plate 60 to enter and exit. Furthermore, for ease of assembly, the locking plate 60 can be configured as a split type, with one part located within the mounting plate 6 and the other part within the mounting piece 74. Further, the inner side of the mounting piece 74 is provided with a slot to accommodate the sliding stroke of the hanging plate 651. The manufacturing process of the mounting piece 74 can be adjusted according to market requirements, such as casting, sheet metal processing, or injection molding.

[0073] To prevent the counterweights from jamming together due to poor engagement when they are connected via slots and blocks, such as... Figures 19-22As shown, in one embodiment of this utility model, the slot 72 includes a first segment 721 and a second segment 722 connected sequentially from top to bottom. The first segment 721 is V-shaped, and the second segment 722 is rectangular. The first segment 721 can guide the counterweight 7 into the slot 72 below it when the counterweight 7 does not properly engage with the block 73, thus ensuring a good connection and preventing the oblique block from getting stuck due to spatial misalignment with the oblique slot. Furthermore, there is a rounded transition surface between the first segment 721 and the second segment 722. Furthermore, the bottom of the second segment 722 is a non-through design, forming a limiting edge 723 at the bottom, which ensures accurate alignment of the through holes 71 after multiple counterweights 7 are engaged, avoiding inaccurate positioning of the through holes 71 and difficulty in adjusting the position. Furthermore, the bottom of the block 73 has a downwardly inclined guide slope 731 to facilitate insertion into the slot 72.

[0074] like Figures 19-22 As shown, in one embodiment of this utility model, the counterweight 7 is circular with a flat edge at the bottom to prevent it from rolling on the ground. Furthermore, the counterweight 7 is made of iron and coated with plastic to reduce damage to the ground or other objects from impacts. Specifically, the counterweight 7 consists of an inner iron plate 75 and an outer plastic layer 76. The inner iron plate 75 can be connected using a riveting process, consisting of four iron plates connected by multiple rivets. The outer plastic layer 76 is fully fused and injection molded twice, connecting the outer plastic layer 76 and the inner iron plate 75 through a second complete fusion around the perimeter and multiple holes, avoiding the problems of bulging, hollowing, and cracking of the plastic layer. Alternatively, the inner iron plate 75 can also be connected using a welding process, which allows for automated welding by a robotic arm, improving production efficiency. This process involves pre-drilling multiple holes on the iron plate 75 to connect the outer plastic layer 76 and the inner iron plate 75, similarly preventing the problems of bulging, hollowing, and cracking of the outer plastic layer. The iron plate 75 is cast as a single piece of gray iron, characterized by high production efficiency, the ability to achieve all shape and position requirements in one go, and the elimination of secondary processing. Two injection molding methods are available: one-time injection molding using a vertical injection molding machine and two-time injection molding using a horizontal injection molding machine. In the one-time injection molding process, the iron plate 75 is first placed on the positioning fulcrum of the injection mold using a vertical injection molding machine, and then the counterweight plate 7 is simultaneously injection molded from both the top and bottom. In the two-time injection molding process, when using a horizontal injection molding machine, the plastic is first injection molded to the lower half of the iron plate 75, and then the upper half is injection molded. This process ensures a full, gapless outer injection molding layer around the iron plate, making it sturdy and durable, and it remained undamaged in a 3-meter drop test. Furthermore, the surface coating process allows for changing the color of the counterweight plate by altering the color of the plastic material, catering to the aesthetic preferences of various consumer groups in the market.

[0075] like Figures 23-25As shown, in one embodiment of this utility model, the weightlifting equipment also includes a base 8. The base 8 can be used for the placement and positioning of the weightlifting equipment, assist in weight adjustment, and facilitate the carrying and transportation of the weightlifting equipment. The base 8 can be used with the weightlifting equipment in various environments such as the ground, dumbbell rack, desktop, and car.

[0076] like Figures 23-24 As shown, in order to facilitate the stable placement of the counterweight 7, the inner walls on both sides of the base 8 are provided with limiting grooves 81 or limiting blocks corresponding to the locking blocks 74 or locking slots 74 of the counterweight 7, so as to form an axial positioning with the counterweight 7.

[0077] like Figures 23-24 As shown, in order to lift the locking plate 60 to unlock the telescopic shaft 3, the top surface of the base 8 is provided with a cuboid-shaped unlocking block 82. The unlocking block 82 corresponds to the position of the locking plate 60. It adopts a solid bottom reinforcement design to ensure the strength of use, prevent damage, and improve product quality.

[0078] like Figures 23-25 As shown, to facilitate the handling of the lifting equipment, the base 8 has rotatable handles 83 on both outer sides. For mounting the handles 83, the base 8 has through-holes on its outer side, through which the pivot of the handle 8 passes. Additionally, the outer side of the base 8 has a storage groove 84 corresponding to the handle 8; when not in use, the handle 83 naturally retracts into the storage groove 84, resulting in a harmonious and unobtrusive appearance.

[0079] like Figures 23-25 As shown, in one embodiment of this utility model, the base 8 is provided with a support plate 85 for axially positioning the semi-adjusting piece 68. Furthermore, the bottom of the base 8 is provided with a suction cup 86, which uses the suction force of the suction cup 86 to fix the base 8 to the flat surface. For example, when the base 8 is placed on a flat surface such as a tile, floor, or table, it is less likely to be lifted or displaced when lifting equipment is picked up or put down.

[0080] The above description is merely a preferred embodiment of this utility model and is not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A telescopic adjustment mechanism, characterized in that, The utility model relates to a rotating sleeve, fixed sleeve and two telescopic shafts, the rotating sleeve is rotatably arranged in the periphery of the fixed sleeve, the telescopic shafts are oppositely arranged in the fixed sleeve and can slide along the axial direction of the fixed sleeve, The side wall of the rotating sleeve is provided with two helical guide grooves arranged oppositely, and the ends of the two guide grooves close to each other are staggered in the axial direction of the rotating sleeve; The side wall of the fixed sleeve is provided with two linear track grooves arranged oppositely, and the ends of the two track grooves close to each other are staggered in the axial direction of the fixed sleeve; The ends of the telescopic shafts close to each other are provided with protruding parts extending outward along the axial direction of the telescopic shafts, and the protruding parts of the two telescopic shafts are staggered in the axial direction of the fixed sleeve; the protruding parts are provided with guide shafts extending outward along the radial direction of the telescopic shafts, and the two guide shafts are sequentially inserted into the two track grooves and the two guide grooves, respectively.

2. The telescoping adjustment mechanism of claim 1, wherein, The telescopic shafts are provided with first ball head plungers arranged along the radial direction of the telescopic shafts, the side wall of the fixed sleeve is provided with a plurality of first positioning holes corresponding to the first ball head plungers, so that the ball heads of the first ball head plungers are normally located in the first positioning holes; the first positioning holes are uniformly distributed along the axial direction of the fixed sleeve.

3. The telescoping adjustment mechanism of claim 2, wherein, The rotating sleeve is provided with a handle sleeve, both ends of the handle sleeve are fixedly provided with rotating discs, the rotating discs are fixedly connected with the ends of the rotating sleeve; the rotating disc is provided with a positioning ring body, the outer side of the positioning ring body is provided with second positioning holes uniformly distributed along the circumferential direction of the positioning ring body; Both ends of the fixed sleeve are located outside the rotating sleeve, and both ends of the fixed sleeve are provided with mounting discs, the mounting discs are provided with second ball head plungers corresponding to the second positioning holes, the second ball head plungers are arranged along the axial direction parallel to the mounting discs, so that the ball heads of the second ball head plungers are normally located in the second positioning holes.

4. The telescoping adjustment mechanism of claim 3, wherein, The inner side of the edge of the rotating disc is provided with an annular driving plate, the outer edge of the driving plate is in a wave shape, forming wave crests and wave troughs; both sides of the inside of the mounting disc are provided with adjusting grooves arranged along the axial direction parallel to the mounting disc, the adjusting grooves are provided with adjusting plates capable of sliding along the adjusting grooves; a spring is arranged between one end of the adjusting plate and the inner end of the adjusting groove, so that the other end of the adjusting plate abuts against the outer edge of the driving plate; the outer side of the adjusting plate is provided with a hanging plate extending along the radial direction of the mounting disc, both sides of the mounting disc are provided with sliding grooves corresponding to the hanging plate, the sliding grooves extend along the axial direction parallel to the mounting disc; the hanging plate is arranged in the sliding groove, and the end of the hanging plate is located outside the sliding groove; the bottom of the mounting disc is provided with a semicircular half adjusting piece, both ends of the inner side of the half adjusting piece are provided with hanging grooves corresponding to the sliding grooves; when the end of the adjusting plate abuts against the wave crest or the wave trough of the outer edge of the driving plate, the hanging plate slides into the hanging groove; when the end of the adjusting plate abuts against the wave trough or the wave crest of the outer edge of the driving plate, the hanging plate slides out of the hanging groove.

5. The telescoping adjustment mechanism of claim 4, wherein, The top of the mounting disc is fixedly provided with a half fixing piece, the half fixing piece is connected with both ends of the half adjusting piece and forms an annular shape.

6. The telescoping adjustment mechanism of claim 3, wherein, The top of the telescopic shaft is provided with a plurality of positioning grooves which are uniformly distributed along the axial direction of the telescopic shaft; the top of the two ends of the fixed sleeve is provided with a notch corresponding to the positioning groove; the mounting disc is internally provided with a lock plate which can vertically slide, the middle part of the lock plate is provided with a lock hole and is sleeved on the end of the fixed sleeve; the top of the lock hole of the lock plate normally penetrates through the notch and is located in the positioning groove; the bottom of the mounting disc is provided with a lock groove corresponding to the lock plate, the bottom of the lock plate penetrates through the lock groove and is located outside the mounting disc.

7. A weight lifting device characterized by, The telescopic adjustment mechanism according to any one of claims 3 to 6 and a plurality of weight pieces; the middle part of the weight piece is provided with a through hole for the telescopic shaft to pass through.

8. The weight lifting apparatus of claim 7, wherein, One side of the weight piece is provided with a dovetail-shaped clamping groove, and the other side of the weight piece is provided with a clamping block corresponding in shape to the clamping groove; the outer side of the mounting disc is fixedly provided with a mounting piece, and the outer side of the mounting piece is provided with a mounting groove or a mounting block corresponding to the clamping block or the clamping groove.

9. The weight lifting apparatus of claim 8, wherein, The clamping groove comprises a first segment and a second segment connected in sequence from top to bottom, the first segment is V-shaped, and the second segment is rectangular.

10. The weight lifting apparatus of any one of claims 7 to 9, wherein, The base is further included; the inner walls of the two sides of the base are provided with a limiting groove or a limiting block corresponding to the clamping block or the clamping groove of the weight piece; And / or, the top surface of the base is provided with a cuboid-shaped unlocking block; And / or, the outer side of the two ends of the base is provided with a rotatable handle.

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