Telescopic adjusting mechanism and weightlifting equipment comprising same

Abstract

The invention provides a telescopic adjusting mechanism and weight lifting 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 adjustable weight stacks, more weight stacks can be lifted, and the maximum weight lifting weight of the weight lifting device is increased.

Description

Technical Field

[0001] The present invention relates to the technical field of weightlifting equipment, and in particular to a telescopic adjustment mechanism and a weightlifting equipment comprising the telescopic adjustment mechanism. Background Art

[0002] Existing weightlifting equipment, such as dumbbells and barbells, are similar in structure, with weight plates at both ends of the handles. In addition, the handle length of existing weightlifting equipment is generally fixed. If the weight needs to be increased or decreased, the weight plates at both ends of the handle need to be manually increased or decreased, which is inconvenient to operate. As a result, adjustable length handles have appeared on the market, which can adjust the extension length of the handles to both ends, thereby carrying different numbers of weight plates, so as to achieve the purpose of adjusting the weight. However, the maximum extension length of the current adjustable length handles is relatively small, which restricts the maximum number of weight plates that can be carried, that is, limits the maximum weight of the weightlifting equipment.

[0003] Therefore, it is necessary to provide an improved technical solution to address the above-mentioned deficiencies in the prior art. Summary of the invention

[0004] The object of the present invention is to provide a telescopic adjustment mechanism, which can increase the maximum extension length of the handle. When applied to a weightlifting device with adjustable weight plates, it can carry more weight plates and increase the maximum lifting weight of the weightlifting device.

[0005] Another object of the present invention is to provide a weightlifting device, which includes the above-mentioned telescopic adjustment mechanism, which can carry a larger number of weight plates and increase the maximum lifting weight of the weightlifting device.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] A telescopic adjustment mechanism comprises a rotating sleeve, a fixed sleeve and two telescopic shafts, wherein the rotating sleeve is rotatably arranged on the outer periphery of the fixed sleeve, and the telescopic shaft is relatively arranged in 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 spiral guide grooves arranged opposite to each other, and the ends of the two guide grooves close to each other are staggered in the axial direction of the rotating sleeve;

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

[0010] One end of the telescopic shafts that is close to each other is provided with a protrusion extending outward along the axial direction of the telescopic shaft, and the protrusions of the two telescopic shafts are staggered in the axial direction of the fixed sleeve; the protrusion is provided with a guide shaft extending outward along the radial direction of the telescopic shaft, 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 sleeved on the outer circumference of the rotating sleeve, and rotating disks are fixedly provided at both ends of the handle sleeve, and the rotating disks are fixedly connected to the ends of the rotating sleeve; a positioning ring body is provided inside the rotating disk, and second positioning holes are evenly distributed along the circumference of the positioning ring body on the outer side of the positioning ring body;

[0013] Both ends of the fixed sleeve are located outside the rotating sleeve, and both ends of the fixed sleeve are sleeved with mounting plates, the mounting plates are provided with a second ball head plunger corresponding to the second positioning hole, and 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 driving plate is provided on the inner side of the edge of the rotating disk, and the outer edge of the driving plate is wavy to form wave 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 an adjustment plate that can slide along the adjustment groove is provided in the adjustment groove; 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 is against the outer edge of the driving 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 on both sides. A slide groove corresponding to the hanging plate extends in a direction parallel to the axial direction of the mounting plate; the hanging plate is inserted into the slide groove, and the end of the hanging plate is located outside the slide groove; a semicircular semi-adjustment sheet is provided at the bottom of the mounting plate, and hanging grooves corresponding to the slide groove are provided on the inner sides of both ends of the semi-adjustment sheet, and when the end of the adjustment plate abuts against the crest or trough of the outer edge of the driving plate, the hanging plate slides into the hanging groove, and when the end of the adjustment plate abuts against the trough or crest of the outer edge of the driving plate, the hanging plate slides out of the hanging groove.

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

[0016] According to one embodiment of the present invention, a plurality of positioning grooves are provided at the top of the telescopic shaft, and the positioning grooves are evenly distributed along the axial direction of the telescopic shaft; notches corresponding to the positioning grooves are provided at the tops of both ends of the fixed sleeve; a locking plate capable of vertical sliding is provided in the mounting disk, a locking hole is provided in the middle of the locking plate and is sleeved on 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; a locking groove corresponding to the locking plate is provided at the bottom of the mounting disk, and the bottom of the locking plate passes through the locking groove and is located outside the mounting disk.

[0017] The present invention also provides a weightlifting device, comprising the above-mentioned telescopic adjustment mechanism and a plurality of weight plates; a through hole is provided in the middle of the weight plate 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; a mounting plate is fixedly provided on the outer side of the mounting plate, and a mounting slot or a mounting block corresponding to the block or slot is provided on the outer side of the mounting plate.

[0019] According to one embodiment of the present invention, the card slot includes a first section and a second section connected in sequence from top to bottom, the first section is V-shaped, and the second section is rectangular.

[0020] According to one embodiment of the present invention, the weightlifting equipment further comprises a base; inner walls on both sides of the base are provided with limit grooves or limit blocks corresponding to the blocks or slots of the weight plate;

[0021] And / or, a rectangular unlocking block is provided on the top surface of the base;

[0022] And / or, rotatable handles are provided on the outer sides of both ends of the base.

[0023] Compared with the prior art, the advantages and beneficial effects of the embodiments of the present invention are:

[0024] When the telescopic adjustment mechanism and weightlifting equipment provided by the embodiment of the present invention are used, the maximum extension length of the telescopic shaft can be increased due to the staggered arrangement of the two guide shafts, that is, the handle of the same length increases the maximum extension length of the telescopic shaft, and is used on dumbbells or barbells with adjustable weight plates, and the number of weight plates of the dumbbells or barbells can be increased, thereby adjusting the adjustable weight of the dumbbells or barbells. In other words, under the condition that the maximum extension length of the telescopic shaft is the same, the handle of the present invention can be shortened in length, and is used on dumbbells or barbells with adjustable weight plates, so that the weight of the dumbbells or barbells can be closer to the center of gravity in the middle, reducing the torque of the weight plates at both ends, and holding the dumbbells or lifting the barbells in the hands during exercise can better maintain the balance between the left and right. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. Among them:

[0026] Figure 1 A schematic diagram of the structure of a telescopic adjustment mechanism provided in an embodiment of the present invention;

[0027] Figure 2 A schematic diagram of the assembly of the telescopic adjustment mechanism provided by an embodiment of the present invention;

[0028] Figure 3 A schematic structural diagram of a rotating sleeve of a telescopic adjustment mechanism provided in an embodiment of the present invention;

[0029] Figure 4 A schematic structural diagram of a fixed sleeve of a telescopic adjustment mechanism provided in an embodiment of the present invention;

[0030] Figure 5 A schematic structural diagram of a telescopic shaft of a telescopic adjustment mechanism provided in an embodiment of the present invention;

[0031] Figure 6 A schematic structural diagram of a telescopic adjustment mechanism provided by another embodiment of the present invention;

[0032] Figure 7 A schematic structural diagram of a handle sleeve of a telescopic adjustment mechanism provided by another embodiment of the present invention;

[0033] Figure 8 A schematic structural diagram of a rotating disk of a telescopic adjustment mechanism provided by another embodiment of the present invention;

[0034] Fig. 9 A schematic structural diagram of a rotating disk of a telescopic adjustment mechanism provided by another embodiment of the present invention at another angle;

[0035] Fig.10 A schematic structural diagram of a mounting plate of a telescopic adjustment mechanism provided in another embodiment of the present invention;

[0036] Fig.11 A schematic structural diagram of another angle of a mounting plate of a telescopic adjustment mechanism provided by another embodiment of the present invention;

[0037] Fig.12 A schematic structural diagram of a telescopic adjustment mechanism provided in yet another embodiment of the present invention;

[0038] Fig.13 A schematic structural diagram of a telescopic adjustment mechanism provided by yet another embodiment of the present invention from another angle;

[0039] Fig.14 A schematic structural diagram of a telescopic adjustment mechanism provided by another embodiment of the present invention at another angle;

[0040] Fig.15 A schematic diagram of the assembly of a telescopic adjustment mechanism provided in yet another embodiment of the present invention;

[0041] Fig.16 A schematic diagram of the appearance of a telescopic adjustment mechanism provided in yet another embodiment of the present invention;

[0042] Fig.17 A schematic structural diagram of a telescopic adjustment mechanism provided by yet another embodiment of the present invention;

[0043] Fig.18 A schematic diagram of the structure of a weightlifting device provided by an embodiment of the present invention;

[0044] Fig.19 A schematic diagram of the structure of a weight plate for a weightlifting device provided by an embodiment of the present invention;

[0045] Fig. 20 A schematic structural diagram of a weight plate of a weightlifting device provided by an embodiment of the present invention from another angle;

[0046] Fig.21 A schematic diagram of assembling a weight plate of a weightlifting device provided by an embodiment of the present invention;

[0047] Fig. 22 A cross-sectional view of a weight plate of a weightlifting device provided by an embodiment of the present invention;

[0048] Fig.23 A schematic structural diagram of a base of a weightlifting device provided by an embodiment of the present invention;

[0049] Fig.24 A schematic diagram of the structure of the base of the weightlifting equipment provided by an embodiment of the present invention from another angle;

[0050] Fig.25 A schematic diagram of the use status of the base of the weightlifting equipment provided by an embodiment of the present invention.

[0051] Description of reference numerals:

[0052] 1. Rotating sleeve; 11. Guide groove; 12. Positioning notch; 13. Shaft retaining ring; 2. Fixed sleeve; 21. Track groove; 22. First positioning hole; 23. Limiting notch; 24. Limiting hole; 25. Shaft retaining ring; 26. Notch; 3. Telescopic shaft; 31. Protrusion; 32. Guide shaft; 321. Rotating member; 33. First ball plunger; 34. Positioning groove; 4. Handle sleeve; 41. Fixed notch; 5. Rotating disk; 51. Positioning ring; 511. Second positioning hole; 52. Rib; 53. Drive plate; 6. Mounting disk; 60. Lock plate; 601. Lock hole; 602. Lock groove; 603. Spring; 604. Locking plate; 61. Second ball plunger; 62. Threaded positioning hole; 63. Blind hole; 64. Adjusting slot; 65. Adjusting plate; 651. Hanging plate; 652. Rolling bearing; 66. Spring; 67. Slide slot; 68. Semi-adjusting plate; 681. Hanging slot; 69. Semi-fixed plate; 7. Counterweight plate; 71. Through hole; 72. Slot; 721. First section; 722. Second section; 723. Limiting rib; 73. Block; 731. Guide ramp; 74. Mounting plate; 75. Iron plate; 76. Plastic layer; 8. Base; 81. Limiting slot; 82. Unlocking block; 83. Handle; 84. Storage slot; 85. Support plate; 86. Suction cup. DETAILED DESCRIPTION

[0053] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments. Each example is provided by way of explanation of the present invention and does not limit the present invention. In fact, it will be clear to those skilled in the art that modifications and variations may be made in the present invention without departing from the scope or spirit of the present invention. For example, a feature shown or described as a part of one embodiment may be used in another embodiment to produce yet another embodiment. Therefore, it is desired that the present invention encompasses such modifications and variations within the scope of the appended claims and their equivalents.

[0054] In the description of the present invention, "first", "second" and similar words do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprising" and similar words mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, but do not exclude other elements or objects. The directions or positional relationships indicated by the terms "longitudinal", "transverse", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom" and the like are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and do not require that the present invention must be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention. The terms "connected", "connected" and "set" used in the present invention should be understood in a broad sense. For example, they can be fixedly connected or detachably connected; they can be directly connected or indirectly connected through an intermediate component; they can be wired electrical connections, radio connections, or wireless communication signal connections. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0055] like Figure 1-Figure 5 As shown, an embodiment of the present invention provides a telescopic adjustment mechanism, including a rotating sleeve 1, a fixed sleeve 2 and two telescopic shafts 3, wherein the rotating sleeve 1 is rotatably arranged on the outer periphery of the fixed sleeve 2, and the telescopic shaft 3 is relatively arranged in 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 spiral guide grooves 11 arranged opposite to each other, and the ends of the two guide grooves 11 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 linear track grooves 21 arranged opposite to each other, and the ends of the two track grooves 21 close to each other are staggered in the axial direction of the fixed sleeve 2. The ends of the two telescopic shafts 3 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 outwardly along the radial direction of the telescopic shaft 3, and the two guide shafts 32 are staggered in the axial direction of the fixed sleeve 2, and 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 by the embodiment of the present invention is in use, the rotating sleeve 1 is rotated, and the spiral guide groove 11 on the rotating sleeve 1 can drive the guide shaft 32 to move axially along the fixed sleeve 2 in the track groove 21 of the fixed sleeve 2, thereby driving the two telescopic shafts 3 to slide in opposite directions in the fixed sleeve 2 to perform telescoping, thereby obtaining a handle with adjustable length. Since the ends of the two telescopic shafts 3 are provided with axially extending protrusions 31, the two protrusions 31 are staggered, and the guide shafts 32 are provided on the protrusions 31, therefore, the two guide shafts 32 are also staggered, so that the maximum extension length of the telescopic shaft 3 can be increased (the extension length of the telescopic shaft 3 is the distance between the guide shaft 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 shaft 3, and is used for dumbbells or barbells with adjustable weight plates, and the number of adjustable weight plates of the dumbbells or barbells can be increased (the number of weight plates is adjusted by the extension length of the telescopic shaft 3), thereby adjusting the adjustable weight of the dumbbells or barbells. In other words, under the condition that the maximum extension length of the telescopic shaft 3 is the same, the handle of the present invention can be shortened in length, and is used for dumbbells or barbells with adjustable weight plates, so that the weight of the dumbbells or barbells can be closer to the center of gravity in the middle, and the torque of the weight plates at both ends is reduced, and the left and right balance can be better maintained when holding the dumbbells or lifting the barbells in the hands during exercise. Furthermore, the first ends of the two guide grooves 11 on the rotating sleeve 1 of the present invention 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 Figure 3-Figure 5 As shown, in a preferred embodiment of the present invention, the first ends of the two guide grooves 11 are respectively located on two opposite sides of the rotating sleeve 1, that is, the angle difference between the two is 180 degrees. Further, similarly, the two track grooves 21 are respectively located on two opposite sides of the fixed sleeve 2, and the angle difference between the two is also 180 degrees; the two guide shafts 32 are respectively located in the two track grooves 21, so the angle difference between the two is also 180 degrees.

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

[0059] like Figure 2 , Figure 4As shown, in order to make the sliding distance of the telescopic shaft 3 accurate and allow the user to easily know the extension distance of the telescopic shaft 3, in one embodiment of the present invention, the telescopic shaft 3 is provided with a first ball plunger 33 (or spring bead) arranged along the radial direction of the telescopic shaft 3, and the side wall of the fixed sleeve 2 is provided with a plurality of first positioning holes 22 corresponding to the first ball plunger 33, and 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 plunger 33 is normally located in the first positioning hole 22. Each first positioning hole 22 is equivalent to a plurality of gears, corresponding to the extension distance of the telescopic shaft 3. When the telescopic shaft 3 is in a certain gear position, the rotating sleeve 1 is rotated to drive the telescopic shaft 3 to slide in the fixed sleeve 2, and the spring force of the first ball plunger 33 must be overcome so that the ball head of the first ball plunger 33 is pushed back into the first ball plunger 33; 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 into the next first positioning hole 22 again and plays a positioning role, staying in the gear position, and producing a metal collision sound. The user can know how many fixed distances the telescopic shaft 3 has moved by the resistance of rotating the rotating sleeve 1 and the sound of metal collision, and when the user does not operate the rotating sleeve 1, the telescopic shaft 3 can also stay in a specific gear position due to the positioning between the ball head of the first ball plunger 33 and the first positioning hole 22, thereby preventing the telescopic shaft 3 from moving. Applied to dumbbells or barbells with adjustable weight plates, each gear can be accurately positioned to avoid the axial swing of the telescopic shaft 3 caused by the matching gap, and to prevent the weight plate from falling and the problem of the next dumbbell plate being brought up. Preferably, in order to improve the movement accuracy and positioning accuracy of the telescopic shaft 3, the first ball plunger 33 is two and symmetrically arranged, or the first ball plunger 33 is a double ball plunger; accordingly, the first positioning hole 22 is provided on both opposite sides of the fixed sleeve 2.

[0060] like Figure 6As shown, in order to further improve the moving precision and positioning accuracy of the telescopic shaft 3, in one embodiment of the present invention, the outer circumference of the rotating sleeve 1 is sleeved with a handle sleeve 4, and the two ends of the handle sleeve 4 are fixedly provided with a rotating disk 5, and the rotating disk 5 is fixedly connected to the end of the rotating sleeve 1. A positioning ring body 51 is provided inside the rotating disk 5, and the outer side of the positioning ring body 51 is provided with second positioning holes 511 evenly distributed along the circumference of the positioning ring body 51. The two ends of the fixed sleeve 2 are located outside the rotating sleeve 1, and the two ends of the fixed sleeve 2 are sleeved with a mounting disk 6, and the mounting disk 6 is provided with a second ball plunger 61 corresponding to the second positioning hole 511. The second ball 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 plunger 61 is normally located in the second positioning hole 511. In this embodiment, each second positioning hole 511 corresponds to the length of the extension of the telescopic shaft 3 to form different gears. When the handle sleeve 4 rotates, similar to the working principle between the first ball plunger 33 and the first positioning hole 22, the second ball plunger 61 and the second positioning hole 511 can also make the gear position accurately adjusted, and produce a clicking sound when the gear position is in place. When applied to dumbbells or barbells with adjustable weight plates, each gear position can be accurately positioned to avoid the swing of the telescopic shaft in the axial direction caused by the matching clearance, and to prevent the weight plate from falling and the problem of bringing up the next dumbbell plate. Preferably, the number of the second ball plunger 61 is multiple, and they are evenly spaced around the circumference of the mounting plate 6. In addition, the first positioning hole 22 corresponds to the second positioning hole 511, so that when the ball head of the first ball plunger 33 is located in one of the first positioning holes 22, the ball head of the second ball plunger 61 is also located in a corresponding second positioning hole 511 at the same time, so that the gear position positioning is more accurate. The reason why the second ball plunger 61 is arranged axially rather than radially is that if the second ball plunger 61 is arranged radially, when it cooperates with the rotating disk 5 made of plastic, the elastic force is small and there is no sense of gear (the feeling of preventing the handle sleeve 4 from rotating to other gears), and the elastic force is large, which will partially lift up the plastic rotating disk 5, affecting the appearance. In addition, after a period of wear, the plastic parts will produce grooves, which will reduce the sense of gear. In the embodiment of the present invention, the second ball plunger 61 is arranged axially and cooperates with the iron positioning ring body 51. The low elastic force has a sense of gear; the outer shell of the rotating disk 5 does not deform and will not affect the appearance, and in terms of materials, the cooperation between iron and iron will not cause rapid wear.

[0061] like Figure 7As shown, in one embodiment of the present invention, two long strip-shaped fixing notches 41 are respectively opened at both ends of the handle sleeve 4 to securely position the key in the through hole in the middle of the rotating disk 5, realize synchronous rotation, and improve processing efficiency. In addition, in order to prevent slipping, the surface of the handle sleeve 4 for the user to hold can be knurled to obtain a fishnet-shaped anti-slip texture, a long strip-shaped anti-slip texture, and various customized anti-slip patterns, etc. The texture can be changed according to market demand; in addition, the surface of the handle sleeve 4 can also be chrome-plated with iron, and the surface can be covered with rubber or plastic and other materials. According to market demand, the handle sleeve 4 can be treated with various materials for anti-slip treatment.

[0062] like Figure 8 , Fig. 9 As shown, in one embodiment of the present invention, the rotating disk 5 is in the shape of a weight, and the gear numbers are evenly distributed on the inclined surface. With the second positioning hole 511 and the second ball plunger 61, one gear can be changed for each rotation angle. Applicable to dumbbells or barbells with adjustable weight plates, the gear numbers can be changed according to the number of gears and the change of the adjustment weight. Specifically, the handle sleeve 4 rotates 22.5 degrees to form a gear, and a total of 16 gears are set. The values ​​on the gears can be changed accordingly according to the total weight requirements. The rotating sleeve 1 is rotated by the handle sleeve 4, and then the telescopic shaft 3 is driven to move linearly through the spiral guide groove 11. In this embodiment, for every 22.5 degrees of rotation of the handle sleeve 4, a single telescopic shaft 3 moves linearly in and out of the thickness of a weight plate to increase or decrease the weight plate.

[0063] Furthermore, if Figure 6 , Figure 8-Figure 9 As shown, in the through hole in the middle of the rotating disk 5, a key for positioning and connecting with the fixed notch 41 at the end of the handle sleeve 4 is provided at one end facing the handle sleeve 4, which plays a role in rotation and positioning of the handle sleeve 4, and a key for positioning and connecting with the positioning notch 12 at the end of the rotating sleeve 1 is provided at the other end, which plays a role in rotation positioning and radial positioning of the rotating sleeve 1. The end of the rotating sleeve 1 is also provided with a shaft retaining ring 13 for axial positioning of the rotating disk 5 and the positioning ring body 51. Preferably, there are two positioning notches 12 at the end of the rotating sleeve 1, and the angle difference is 180 degrees (i.e., they are arranged relative to each other), so that the left and right molds can be interchangeable. Furthermore, the rotating disk 5 is provided with uniformly distributed ribs 52 inside, which can support and fix the structure of the rotating disk 5. In addition, the positioning ring body 51 can be axially positioned, and plugged into the groove inside the positioning ring body 51 to position its rotation direction so that it can rotate synchronously with the rotating disk 5.

[0064] like Figure 4 , Figure 6 , Figure 10-11As shown, in one embodiment of the present invention, the mounting disk 6 is in the shape of a disk. The mounting disk 6 has a center hole in the center, and a key for positioning with the fixed sleeve 2 is provided in the hole. Correspondingly, the two ends of the fixed sleeve 2 have limit slots 23, which are distributed opposite to each other at 180 degrees, so that the mounting disk 6 can be universal on the left and right, reducing production costs and improving installation efficiency. In addition, the outer end of the mounting disk 6 is provided with two symmetrical threaded positioning holes 62 arranged along the radial direction of the mounting disk 6, which are used for installation and positioning with the fixed sleeve 2. Correspondingly, the two ends of the fixed sleeve 2 are also provided with corresponding limit holes 24, so as to be fixedly connected by bolts. In addition, the end of the fixed sleeve 2 is also provided with a shaft retaining ring 25 to limit the mounting disk 6 in the axial direction. Further, a circular blind hole 63 is provided in the mounting disk 6 for installing the second ball plunger 61.

[0065] When the telescopic adjustment mechanism of the present invention is applied to a dumbbell or barbell with adjustable weight plates, in order to make the weight of the dumbbell adjusted in each gear more precise, in one embodiment of the present invention, a half-adjustment plate (the weight is half of a single weight plate) structure is added. For example, the weight of each weight plate is 2 kg, and the existing dumbbell or barbell with adjustable weight plates can increase or decrease the weight by 4 kg each time (add or decrease one weight plate at each end), while in this embodiment, the weight can be increased or decreased by the weight of one weight plate each time (that is, increase or decrease the weight of half a weight plate at each end). Specifically, if Figure 12-Figure 15 As shown, an annular driving plate 53 is provided on the inner side of the edge of the rotating disk 5, and the outer edge of the driving plate 53 is wavy, forming crests and troughs. Adjustment grooves 64 are provided on both sides of the interior of the mounting disk 6 along a direction parallel to the axial direction of the mounting disk 6, and an adjustment plate 65 that can slide along the adjustment groove 64 is provided in 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 is against the outer edge of the driving plate 53. A hanging plate 651 extending radially along the mounting disk 6 is provided on the outer side of the adjustment plate 65, and a slide groove 67 corresponding to the hanging plate 651 is provided on both sides of the mounting disk 6, and the slide groove 67 extends in a direction parallel to the axial direction of the mounting disk 6. The hanging plate 651 is inserted into the slide groove 67, and the end of the hanging plate 651 is located outside the slide groove 67. A semicircular semi-adjusting piece 68 is provided at the bottom of the mounting plate 6, and a hanging groove 681 corresponding to the sliding groove 67 is provided on the inner side of both ends of the semi-adjusting piece 68. When the end of the adjusting plate 65 abuts against the crest or trough of the outer edge of the driving plate 53, the hanging plate 651 slides into the hanging groove 681. When the end of the adjusting plate 65 abuts against the trough or crest of the outer edge of the driving plate 53, the hanging plate 651 slides out of the hanging groove 681.

[0066] In this embodiment, when the rotating disk 5 rotates, the adjusting plate 65 can make an axial reciprocating motion through the crests and troughs of the outer edge of the driving plate 53, driving the hanging plate 651 to make an axial reciprocating motion, and then can slide into and out of the hanging groove 681 of the semi-adjusting plate 68. When the hanging plate 651 slides into the hanging groove 681, the semi-adjusting plate 68 is connected to the telescopic adjustment mechanism, and when the hanging plate 651 slides out of the hanging groove 681, the semi-adjusting plate 68 is not connected to the telescopic adjustment mechanism. At this time, it is set that the telescopic shaft 3 is telescoped by half the thickness of the counterweight plate every time the rotating disk 5 rotates one gear, and at the same time, the driving plate 53 completes a conversion between crests and troughs, and the adjusting plate 65 is reciprocated along the axial direction of the mounting plate 6 once (i.e., the conversion of sliding into and out of the hanging groove 681). For example, the thickness of the weight plate is 13 mm, and the rotating disk 5 rotates 22.5 degrees per rotation adjustment of 1 gear, and the telescopic shaft 3 moves in and out 6.5 mm. The weight of each weight plate is 2 kg, and the weight of the half adjustment plate 68 is half of the weight plate, that is, 1 kg. Assuming that the weight of the weightlifting equipment is 10 kg at this time, the hanging plate 651 does not slide into the hanging groove 681 (i.e., it does not carry the half-adjustment plate 68), and the end of the telescopic shaft 3 extends into the half thickness of the outermost counterweight plate. The handle sleeve 4 is rotated forward by one gear, so that the telescopic shaft 3 extends outward by half the thickness of the counterweight plate. The number of counterweight plates carried by the telescopic adjustment mechanism remains unchanged, but the weight of two half-adjustment plates 68 will be increased, i.e., 2 kg. Continue to rotate forward by one gear, and the telescopic shaft will extend into the half thickness of the next counterweight plate, which will increase the weight of two counterweight plates. However, at the same time, the hanging plate 651 slides out of the hanging groove 681, which will reduce the weight of the two half-adjustment plates 68. The same is true for reverse rotation, so that the weight adjusted each time the gear is rotated is the weight of the two half-adjustment plates 68, so that the weight adjustment is refined to meet the needs of users.

[0067] Specifically, the shape of the semi-adjusting piece 68 is semicircular and wrapped around the outer periphery of the mounting plate 6. In order to realize the integration of the counterweight plate 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-adjusting piece 68, the semi-fixed piece 69 is connected to the two ends of the semi-adjusting piece 68 and forms a ring. One side of the semi-adjusting piece 68 and the semi-fixed piece 69 is an inclined surface, which smoothly transitions with the inclined surface of the rotating disk 5. The manufacturing process of the semi-adjusting piece 68 and the semi-fixed piece 69 can be adjusted according to market requirements, such as: casting process, sheet metal processing process, injection molding process. Preferably, the semi-adjusting piece 68 and the semi-fixed piece 69 are designed as an oblique cut at the semicircular interface position, so that the semi-adjusting piece 68 can be separated from the mounting plate 6 smoothly. Further, there is a circle of convex rings at the outer end of the mounting plate 6, and the inner walls of the semi-adjusting piece 68 and the semi-fixed piece 69 are provided with an annular groove corresponding to the convex ring, which can play an axial positioning role for the semi-adjusting piece 68 and the semi-fixed piece 69. In addition, the semi-fixed plate 69 can also play the following roles: 1. Adding counterweight to change the weight of the weightlifting equipment; 2. A pointer mark can be set in the middle to cooperate with the gear number on the rotating disk 5 to play the role of gear indication.

[0068] In order to reduce friction, a rolling bearing 652 is provided at the end of the adjustment plate 65 for abutting against the outer edge of the driving plate 53 .

[0069] like Figure 5 , Fig.11 , Fig.17As shown, in order to prevent the telescopic shaft 3 from moving in the axial direction when the telescopic adjustment mechanism is in use and ensure safety in use, in one embodiment of the present invention, a plurality of positioning grooves 34 are provided on the top of the telescopic shaft 3, and the positioning grooves 34 are evenly distributed along the axial direction of the telescopic shaft 3. Notches 26 corresponding to the positioning grooves 34 are provided on the tops of both ends of the fixed sleeve 2. A locking plate 60 capable of vertical sliding is provided inside the mounting plate 6, and a locking hole 601 is provided in the middle of the locking plate 60 and is sleeved on the end of the fixed sleeve 2. The top of the locking hole 601 of the locking plate 60 normally passes through the notch 26 and is located in the positioning groove 34. A locking groove 602 corresponding to the locking plate 60 is provided at the bottom of the mounting plate 6, 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 a predetermined length, the top of the locking hole 601 of the locking plate 60 can fall into the positioning groove 34 of the telescopic shaft 3 and the notch 26 of the fixed sleeve 2 under the action of gravity, thereby preventing the telescopic shaft 3 from moving in the axial direction; when the telescopic adjustment mechanism is used, it is placed on the ground or on 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 up, and the top of the locking hole 601 of the locking plate 60 is separated from the positioning groove 34 and the notch 26, so that the length of the telescopic shaft 3 can be readjusted. Preferably, in order 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, and the locking plate 60 is normally pressed down to prevent the locking plate 60 from being unlocked from the telescopic shaft 3 after the telescopic adjustment mechanism is flipped, resulting in the axial movement of the telescopic shaft 3. Furthermore, in order to improve the locking effect, the top of the lock hole 601 of the lock plate 60 is convex downward to form a locking piece 604, and the locking piece 604 corresponds to the shape of the positioning groove 34. The lock plate 60 cooperates with the spring 603 installed on the mounting plate 6. Under the elastic force of the spring 603, the locking piece 604 of the lock plate 60 is buckled in the positioning groove 34 of the telescopic shaft 3 to achieve a self-locking function and gear locking. For example, when the weightlifting equipment has adjusted the number of weight plates, the length of the telescopic shaft 3 can be automatically locked after being lifted from the base to prevent the weight plates from falling due to the rotation of the handle sleeve 4 during movement.

[0070] like Fig.18 As shown, the present invention also provides a weightlifting device, including the above-mentioned telescopic adjustment mechanism and a plurality of weight plates 7. Figure 19-22 As shown, a through hole 71 is provided in the middle of the weight plate 7 for the telescopic shaft 3 to pass through. The weightlifting equipment can be a dumbbell or a barbell. By adjusting the length of the telescopic shaft 3, the number of weight plates 7 hung on the telescopic shaft 3 can be adjusted, thereby adjusting the weight of the weightlifting equipment.

[0071] like Figure 19-22As shown, in one embodiment of the present invention, a dovetail-shaped slot 72 is provided on one side of the counterweight plate 7, and a block 73 corresponding to the shape of the slot 72 is provided on the other side of the counterweight plate 7. A mounting plate 74 is fixedly provided on the outer side of the mounting plate 6, and a mounting groove or a mounting block corresponding to the block 73 or the slot 72 is provided on the outer side of the mounting plate 74 to connect with each counterweight plate 7. In this embodiment, the mounting plate 74 is fixedly connected to the telescopic adjustment mechanism, and each counterweight plate 7 and the mounting plate 74 are connected to each other in the axial direction of the telescopic shaft 3. When the telescopic shaft 3 carries a certain number of counterweight plates 7, the telescopic shaft 3 limits the radial position of each counterweight plate 7. The mounting plate 74 and the slot 72 and the block 73 of the counterweight plate 7 can limit the position of each counterweight plate 7 in the axial direction, thereby ensuring the connection stability of each counterweight plate 7 and the telescopic adjustment mechanism. In addition, the mounting plate 74 also has the following functions: 1. The maximum and minimum total weights of the weightlifting equipment can be changed by changing the weight of the mounting plate 74; 2. The mounting plate 74 is combined with the semi-adjusting plate 68 and the semi-fixed plate 69 as a whole, which can improve the aesthetics and coordination; 3. The telescopic adjustment mechanism and the counterweight plate 7 are connected by the mounting plate 74. If the counterweight plates 7 of different weights 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, the semi-fixed plate 69, and the semi-adjusting plate 68 adopt the method of wrapping the handle mounting plate 6 to make the appearance more integrated, improve the coordination and aesthetics of the appearance, and also move the weight to the middle center of gravity. The inner distance between the left and right counterweight plates 7 is small, which improves the left and right balance when the weightlifting equipment is used. The weight plate 7 of the weightlifting equipment provided in the embodiment of the present invention has the function of preventing falling off and loosening. The cooperation between the slot 72 and the block 73 of the weight plate 7 and the cooperation between the telescopic shaft 3 and the through hole 71 of the weight plate 7 realize six degrees of freedom positioning: the cooperation between the slot 72 and the block 73 of the weight plate 7 realizes four degrees of freedom positioning in the longitudinal and lateral directions; the cooperation between the telescopic shaft 3 and the through hole 71 of the weight plate 7 realizes two degrees of freedom positioning in the vertical direction.

[0072] like Figure 10-11 As shown, in one embodiment of the present invention, the side of the mounting plate 6 is provided with a bolt hole for connecting with the mounting plate. In addition, the bottom of the mounting plate 74 is provided with a slot corresponding to the lock slot 602 for the lock plate 60 to enter and exit. In addition, in order to facilitate assembly, the lock plate 60 can be set as a split type, with one part located in the mounting plate 6 and the other part located in the mounting plate 74. Further, the inner side of the mounting plate 74 is provided with a notch to avoid the sliding travel of the hanging plate 651. The manufacturing process of the mounting plate 74 can be adjusted according to market requirements, such as: casting process, sheet metal processing process, injection molding process.

[0073] In order to avoid the weight plates from getting stuck to each other when they are matched with each other through the slots and blocks, Figure 19-22As shown, in one embodiment of the present invention, the slot 72 includes a first section 721 and a second section 722 connected sequentially from top to bottom, the first section 721 is V-shaped, and the second section 722 is rectangular. Through the first section 721, when the slot 72 of the weight plate 7 is not well combined with the block 73, it can be corrected and then slid into the second section 722 below to achieve a good connection, avoiding the situation where the oblique block and the oblique slot are stuck and cannot move when there is a spatial misalignment. Further, there is an arc transition surface between the first section 721 and the second section 722. Further, the bottom of the second section 722 is a non-through design, and a limiting retaining edge 723 is formed at the bottom of the second section 722, which can ensure that the alignment of the through hole 71 after the multiple weight plates 7 are matched is accurate, avoiding inaccurate positioning of the through hole 71 and difficulty in adjusting the gear position. Further, a downwardly inclined guide slope 731 is provided at the bottom of the block 73 to facilitate insertion into the slot 72.

[0074] like Figure 19-22 As shown, in one embodiment of the present invention, the weight plate 7 is circular, and the bottom is designed with a flat edge to prevent the weight plate 7 from rolling on the ground. Further, the weight plate 7 is made of iron, and the outside is plastic-coated to reduce the damage to the ground or other objects caused by the weight plate 7 falling. Specifically, the weight plate 7 is composed of an internal iron plate 75 and an external plastic layer 76. The internal iron plate 75 can be connected by a rivet connection process, which is connected by 4 iron plates with multiple rivets. The external plastic layer 76 is fully fused and injection molded twice, and the external plastic layer 76 and the internal iron plate 75 are connected by secondary complete fusion of the circumference and multiple holes, avoiding the problem of bulging, hollowing and cracking of the plastic layer. In addition, the internal iron plate 75 can also be connected by a welding process, which is characterized by being able to realize automatic welding by a manipulator and improve production efficiency. In this process, multiple holes are reserved on the iron plate 75 to connect the external plastic layer 76 and the internal iron plate 75, which can also avoid the problem of bulging, hollowing and cracking of the external plastic layer. The casting process of the iron plate 75 is to cast the whole of gray iron, which is characterized by high production efficiency, all position requirements can be achieved at one time, and no secondary processing is required. There are two injection molding methods: 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, a vertical injection molding machine is used to first place the iron plate 75 on the positioning fulcrum of the injection mold, and then the weight plate 7 is simultaneously injection-molded and wrapped from top to bottom; when the secondary injection molding is performed using a horizontal injection molding machine, the plastic is firstly injection-molded together with the lower half of the iron plate 75, and then the upper half is injection-molded. The above process can make the outer injection molding layer wrap the iron sheet full, without gaps in the middle, strong and durable, and the 3-meter drop test is intact. In addition, the surface coating process can be used to change the color of the weight plate by changing the color of the plastic raw material, which is suitable for the appearance requirements of various consumer groups in the market.

[0075] like Figure 23-Figure 25As shown, in one embodiment of the present invention, the weightlifting device further comprises a base 8. The base 8 can be used for placing and positioning the weightlifting device, assisting in weight adjustment, and facilitating the carrying and carrying of the weightlifting device. The base 8 can be used in conjunction with the weightlifting device in a variety of environments such as the ground, dumbbell rack, desktop, and car.

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

[0077] like Figure 23-Figure 24 As shown, in order to lift up the lock plate 60 to unlock the telescopic shaft 3, a rectangular unlocking block 82 is provided on the top surface of the base 8. The unlocking block 82 corresponds to the position of the lock plate 60, and adopts a solid bottom reinforced design to ensure the strength of use, prevent damage, and improve product quality.

[0078] like Figure 23-Figure 25 As shown, in order to facilitate the carrying of the weightlifting equipment, rotatable handles 83 are provided on the outer sides of the two ends of the base 8. In order to install the handles 83, a through positioning hole is provided on the outer side of the base 8, and the rotating shaft of the handle 8 is passed through the positioning hole. In addition, a storage groove 84 corresponding to the handle 8 is provided on the outer side of the base 8. When the handle 83 is not in use, it is naturally stored in the storage groove 84, making the appearance coordinated and not abrupt.

[0079] like Figure 23-Figure 25 As shown, in one embodiment of the present invention, the base 8 is provided with a support plate 85 for axially positioning the semi-adjusting piece 68. Furthermore, a suction cup 86 is provided at the bottom of the base 8, and the base 8 is fixed by the suction force of the suction cup 86 on the plane. For example, when the base 8 is placed on a flat surface such as a tile, a floor, or a desktop, the base 8 is not easily lifted or displaced when the weight lifting equipment is picked up and put down.

[0080] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A telescopic adjustment mechanism, characterized in that: It comprises a rotating sleeve, a fixed sleeve and two telescopic shafts, wherein the rotating sleeve is rotatably arranged on the outer periphery of the fixed sleeve, and the telescopic shaft is relatively 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 spiral guide grooves arranged opposite to each other, 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 opposite to each other, and the ends of the two track grooves close to each other are staggered in the axial direction of the fixed sleeve; One end of the telescopic shafts that is close to each other is provided with a protrusion extending outward along the axial direction of the telescopic shaft, and the protrusions of the two telescopic shafts are staggered in the axial direction of the fixed sleeve; the protrusion is provided with a guide shaft extending outward along the radial direction of the telescopic shaft, and the two guide shafts are respectively inserted into the two track grooves and the two guide grooves in sequence.

2. The telescopic adjustment mechanism according to claim 1, characterized in that: The telescopic shaft is provided with a first ball plunger radially arranged 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 plunger, so that the ball head of the first ball plunger is normally located in the first positioning hole; the first positioning holes are evenly distributed along the axial direction of the fixed sleeve.

3. The telescopic adjustment mechanism according to claim 2, characterized in that: A handle sleeve is sleeved on the outer circumference of the rotating sleeve, and rotating disks are fixedly provided at both ends of the handle sleeve, and the rotating disks are fixedly connected to the ends of the rotating sleeve; a positioning ring body is provided inside the rotating disk, and second positioning holes are evenly distributed along the circumference of the positioning ring body on the outer side 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 sleeved with mounting plates, the mounting plates are provided with a second ball head plunger corresponding to the second positioning hole, and 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.

4. The telescopic adjustment mechanism according to claim 3, characterized in that: An annular driving plate is provided on the inner side of the edge of the rotating disk, and the outer edge of the driving plate is wavy, forming wave crests and wave troughs; adjustment grooves are provided on both sides of the interior of the mounting plate in a direction parallel to the axial direction of the mounting plate, and an adjustment plate that can slide along the adjustment groove is provided in the adjustment groove; 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 is against the outer edge of the driving plate; a hanging plate extending radially along the mounting plate is provided on the outer side of the adjustment plate, and two sides of the mounting plate are provided with a spring that is opposite to the hanging plate. The cam is provided with a corresponding slide groove, and the slide groove extends in a direction parallel to the axial direction of the mounting plate; the hanging plate is inserted into the slide groove, and the end of the hanging plate is located outside the slide groove; a semicircular semi-adjusting sheet is provided at the bottom of the mounting plate, and hanging grooves corresponding to the slide groove are provided on the inner sides of both ends of the semi-adjusting sheet, and when the end of the adjusting plate abuts against the crest or trough of the outer edge of the driving plate, the hanging plate slides into the hanging groove, and when the end of the adjusting plate abuts against the trough or crest of the outer edge of the driving plate, the hanging plate slides out of the hanging groove.

5. The telescopic adjustment mechanism according to claim 4, characterized in that: A semi-fixed sheet is fixedly provided on the top of the installation plate, and the semi-fixed sheet is connected to both ends of the semi-adjustable sheet to form a ring.

6. The telescopic adjustment mechanism according to claim 3, characterized in that: A plurality of positioning grooves are provided at the top of the telescopic shaft, and the positioning grooves are evenly distributed along the axial direction of the telescopic shaft; notches corresponding to the positioning grooves are provided at the tops of both ends of the fixed sleeve; a locking plate capable of vertical sliding is provided in the mounting disk, a locking hole is provided in the middle of the locking plate and is sleeved on 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; a locking groove corresponding to the locking plate is provided at the bottom of the mounting disk, and the bottom of the locking plate passes through the locking groove and is located outside the mounting disk.

7. A weightlifting device, characterized in that It comprises a telescopic adjustment mechanism according to any one of claims 3 to 6 and a plurality of weight plates; a through hole is provided in the middle of the weight plate for the telescopic shaft to pass through.

8. The weight lifting apparatus of claim 7, wherein: 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; a mounting plate is fixedly provided on the outer side of the mounting plate, and a mounting slot or a mounting block corresponding to the block or slot is provided on the outer side of the mounting plate.

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

10. A weightlifting apparatus according to any one of claims 7 to 9, characterised in that It also includes a base; the inner walls on both sides of the base are provided with limit grooves or limit blocks corresponding to the clamping blocks or clamping grooves of the weight plate; And / or, a rectangular unlocking block is provided on the top surface of the base; And / or, rotatable handles are provided on the outer sides of both ends of the base.

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