A dumbbell with adjustable length

Abstract

The present invention discloses an adjustable dumbbell, which relates to the field of dumbbells and includes a main rod body, two sets of the main rod bodies are fixedly connected together, and the other ends of the two sets of the main rod bodies are respectively fixedly connected to a set of locking mechanisms, and the outer wall of the locking mechanism is slidably sleeved with a counterweight block; the main rod body includes a sleeve, a sliding rod, a groove, a collar, a push ring, a protrusion, a rotating arm, a chuck, and an extension rod; the inner walls of the two sets of the sleeves are respectively slidably connected to a set of sliding rods extending outside the sleeves, and one end of the two sets of the sleeves is respectively fixedly connected to a set of locking mechanisms. The present invention allows the two sets of sliding rods to slide out of the sleeves, thereby lengthening the dumbbell and adjusting the length of the dumbbell. The locking structure pulls the push ring to rotate, so that when the dumbbell is used, the push ring pushes the chuck toward the sliding rod, so that the protrusions on the side wall of the chuck slide into the grooves on the outer wall of the sliding rod.

Description

Technical Field

[0001] The invention relates to the field of dumbbells, in particular to a dumbbell with adjustable length. Background Art

[0002] Dumbbells are an auxiliary equipment for weightlifting and fitness exercises. They are smaller than barbells. The weights of light dumbbells are 1, 2, 3, 5, 8, 12 pounds, 1 pound = 0.4536 kilograms, etc. The weights of heavy dumbbells are 10, 15, 30 kilograms, etc. Because there is no sound during exercise, they are named dumbbells. Dumbbells are a simple equipment used to enhance muscle strength training. Its main material is cast iron, and some are covered with a layer of rubber. Its purpose is to be used for muscle strength training and muscle compound movement training. Patients with low muscle strength due to motor paralysis, pain, long-term inactivity, etc. can hold dumbbells and use the weight of the dumbbells to perform active resistance exercises to train muscle strength.

[0003] However, the existing dumbbells are generally composed of a group of main rods, and matching metal plates are sleeved on both ends of the main rods, and then the matching plates are fixed to the main rods by nuts. The main rods of existing dumbbells are generally made of solid metal rods, so the length of existing dumbbells cannot be adjusted, which limits the use of dumbbells for some training. Summary of the Invention

[0004] Based on this, the purpose of the present invention is to provide a dumbbell with adjustable length to solve the technical problem raised in the above background that the existing dumbbells cannot be adjusted in length, resulting in limitations when using dumbbells for some training.

[0005] To achieve the above object, the present invention provides the following technical solution: a dumbbell with adjustable length, comprising a main rod body, two sets of the main rod bodies fixedly connected together, the other ends of the two sets of the main rod bodies respectively fixedly connected to a set of locking mechanisms, and the outer wall sliding sleeve of the locking mechanism is provided with a counterweight block;

[0006] The main rod body includes a sleeve, a sliding rod, a groove, a ring, a push ring, a protrusion, a rotating arm, a chuck and an extension rod. The inner walls of the two groups of sleeves are respectively slidably connected with a group of sliding rods extending to the outside of the sleeves, and one end of the two groups of sleeves is respectively fixedly connected with a group of locking mechanisms. The ends of the two groups of sliding rods located outside the sleeves are fixedly connected together, and the outer walls of the two groups of sliding rods are provided with multiple groups of grooves. The other ends of the two groups of sleeves are respectively fixedly connected with a group of rings, and the two groups of rings are respectively sleeved on the outer wall of one group of sliding rods.

[0007] As an optimal technical solution for an adjustable-length dumbbell of the present invention, the side wall of the collar is rotatably connected to a push ring, the inner wall of the push ring is fixedly connected to multiple groups of protrusions located inside the collar, the inner wall of the collar is rotatably connected to one end of multiple groups of rotating arms, the other ends of the multiple groups of rotating arms are respectively hinged with a group of chucks, and the side walls of the multiple groups of chucks are respectively fixedly connected to multiple groups of convex strips that match the grooves.

[0008] As an optimal technical solution for an adjustable-length dumbbell of the present invention, the rotating arm is provided with a set of torsion springs at the connection with the collar, the chuck is provided with another set of torsion springs at the connection with the rotating arm, and the side wall of the collar is fixedly connected with a set of extension rods.

[0009] As an optimal technical solution for an adjustable-length dumbbell of the present invention, the outer walls of the two groups of sleeves are respectively fixedly connected with a group of fixing mechanisms, and the fixing mechanisms include a connecting belt, a swivel, a strap, a limit block, a limit tooth, a pin, a push plate and a reset spring. The end of the extension rod is fixedly connected with one end of a group of connecting belts, the other end of the connecting belt is fixedly connected with a strap, and the side wall of the strap is fixedly connected with one end of another group of connecting belts. The outer wall of the sleeve is rotatably connected with a group of swivels, and the other group of connecting belts is fixedly connected to the side wall of the swivel.

[0010] As an optimal technical solution for an adjustable-length dumbbell of the present invention, one end of the strap is fixedly connected to a set of limit blocks, the other end of the strap extends to the inner wall of the limit block, and the side wall of the strap is fixedly connected to multiple sets of limit teeth.

[0011] As a preferred technical solution for an adjustable-length dumbbell of the present invention, a group of pins are slidably connected to the inner wall of the limit block, one end of the pins abuts against the side wall of the limit tooth, and the other end of the pins is fixedly connected to a group of push plates extending to the outside of the limit block, and the pins are fixedly connected to one end of a return spring at the connection with the push plates, and the other end of the return spring is fixedly connected to the other end of the limit block.

[0012] As an optimal technical solution for an adjustable length dumbbell of the present invention, the locking mechanism includes a fixed tube, a slide groove, a bidirectional threaded rod, a sliding block, a push rod, a sliding bar, a sponge and a limit plate. The fixed tube is fixedly connected to one end of the sleeve, and the outer wall of the sleeve is provided with multiple groups of slide grooves.

[0013] As an optimal technical solution for an adjustable-length dumbbell of the present invention, the inner wall of the fixed tube is rotatably connected to a bidirectional threaded rod, the outer wall of the bidirectional threaded rod is threadedly connected to two groups of sliding blocks, the side walls of the two groups of sliding blocks are respectively hinged to one end of a group of push rods, and the other ends of the two groups of push rods on the same side are hinged to a group of sliding bars.

[0014] As a preferred technical solution of the dumbbell with adjustable length of the present invention, the bottom end of the inner wall of the sliding bar is fixedly connected with a sponge, and the top end of the sponge is fixedly connected with multiple groups of limiting plates extending to the outside of the sliding bar.

[0015] In summary, the present invention mainly has the following beneficial effects:

[0016] 1. The present invention adjusts the dumbbell's length by pushing the two sets of sleeves away from each other, allowing the two sets of slide rods to slide out of the sleeves, thereby lengthening the dumbbell's overall length. The locking structure pulls the push ring to rotate, so that when the dumbbell is in use, the push ring pushes the chuck toward the slide rod, causing the ridges on the chuck's sidewalls to slide into the grooves on the slide rod's outer wall.

[0017] 2. By putting the strap on the wrist and tightening the strap through the limit block, the strap is only put on the user's wrist. One set of two connecting belts is connected to the extension rod, and the other set is connected to the swivel, so that the auxiliary strap is connected to the sleeve and the push ring. When the strap is tied to the hand, the push ring can be driven to rotate, so that the sliding rod and the sleeve cannot rotate;

[0018] 3. By rotating the bidirectional threaded rod, the limit plate is pushed out of the fixed tube, so that the sliding bar slides toward the outside of the fixed tube, and the limit plate blocked by the counterweight compresses the sponge, and the limit plate not blocked by the counterweight extends out of the fixed tube, so that the counterweight is blocked, avoiding the problem of accidental loss of the nut used to lock the existing dumbbell.

[0019] 4. The strap is tied around the user's wrist and locked and fixed by a limit block, so that no matter how thick the user's wrist is during use, the strap can fit the user's wrist. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the main structure of the present invention;

[0021] Figure 2 It is a schematic diagram of the top view of the structure of the present invention;

[0022] Figure 3 This is a schematic diagram of the main rod structure of the present invention;

[0023] Figure 4 This is an enlarged structural diagram of point A of the present invention;

[0024] Figure 5 Schematic diagram of the cross-sectional structure of the collar of the present invention;

[0025] Figure 6 Schematic diagram of the cross-sectional structure of the limit block of the present invention;

[0026] Figure 7This is an enlarged structural diagram of point B of the present invention;

[0027] Figure 8 It is a schematic structural diagram of the locking cylinder mechanism of the present invention;

[0028] Figure 9 Schematic diagram of the cross-sectional structure of the sliding bar of the present invention.

[0029] In the figure: 1. Main rod; 2. Fixing mechanism; 3. Locking mechanism; 4. Counterweight;

[0030] 101. Sleeve; 102. Sliding rod; 103. Groove; 104. Ring; 105. Push ring; 106. Bump; 107. Rotating arm; 108. Clamp; 109. Extension rod;

[0031] 201, connecting belt; 202, swivel; 203, binding belt; 204, limit block; 205, limit tooth; 206, latch; 207, push plate; 208, return spring;

[0032] 301. Fixed tube; 302. Slide groove; 303. Bidirectional threaded rod; 304. Sliding block; 305. Push rod; 306. Sliding bar; 307. Sponge; 308. Limiting piece. DETAILED DESCRIPTION

[0033] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be understood as limiting the present invention.

[0034] The following describes an embodiment of the present invention based on its overall structure.

[0035] A dumbbell with adjustable length, such as Figure 1-9 As shown, it includes a main rod body 1, two groups of main rod bodies 1 are fixedly connected together, and the other ends of the two groups of main rod bodies 1 are respectively fixedly connected to a group of locking mechanisms 3, and the outer wall sliding sleeve of the locking mechanism 3 is provided with a counterweight block 4;

[0036] The main rod body 1 includes a sleeve 101, a slide rod 102, a groove 103, a ring 104, a push ring 105, a protrusion 106, a rotating arm 107, a chuck 108 and an extension rod 109. The inner walls of the two sets of sleeves 101 are respectively slidably connected with a set of slide rods 102 extending to the outside of the sleeve 101. One end of the two sets of sleeves 101 is respectively fixedly connected with a set of locking mechanisms 3. The ends of the two sets of slide rods 102 located outside the sleeve 101 are fixedly connected together. The outer walls of the two sets of slide rods 102 are provided with multiple sets of grooves 103. The other ends of the two sets of sleeves 101 are respectively fixedly connected with a set of rings 104. The two sets of rings 104 are respectively sleeved on a set of The outer wall of the sliding rod 102 and the side wall of the ring 104 are rotatably connected to the pushing ring 105, and the inner wall of the pushing ring 105 is fixedly connected to multiple groups of protrusions 106 located inside the ring 104. The inner wall of the ring 104 is rotatably connected to one end of multiple groups of rotating arms 107, and the other ends of the multiple groups of rotating arms 107 are respectively hinged with a group of clamps 108, and the side walls of the multiple groups of clamps 108 are respectively fixedly connected to multiple groups of convex strips that match the grooves 103. The rotating arm 107 is provided with a group of torsion springs at the connection with the ring 104, and the clamp 108 is provided with another group of torsion springs at the connection with the rotating arm 107. The side wall of the ring 104 is fixedly connected to a group of extension rods 109.

[0037] By pushing the two sets of sleeves 101 closer to or away from each other, the slide rod 102 slides out of or into the sleeve 101, thereby adjusting the length of the dumbbell. When the dumbbell is used, the locking device is subjected to tension, and the locking structure is used to pull the extension rod 109, so that the extension rod 109 drives the rotating ring to rotate. During the rotation of the rotating ring, the protrusion 106 is driven to rotate, so that the protrusion 106 contacts the rotating arm 107, causing the rotating arm 107 to flip and twist the torsion spring. During the flipping process, the rotating arm 107 drives the clamp 108 to approach the slide rod 102, so that the clamp 108 drives the protrusion to extend into the groove 103. When the dumbbell is not in use, the locking structure is not subjected to force, so the extension rod 109 will not be pulled, so that the torsion drives the rotating arm 107 to reset, and the connection between the chuck 108 and the rotating arm 107 is hinged, and the curvature of the chuck 108 matches the outer wall of the slide rod 102, so that the chuck 108 can fit snugly on the outer wall of the slide rod 102, and after the rotating arm 107 is pushed to reset by the torsion spring, another set of torsion springs pushes the chuck 108 to reset, so that the angle between the chuck 108 and the rotating arm 107 returns to the initial state.

[0038] Please refer to Figure 1-9The outer walls of the two sets of sleeves 101 are respectively fixedly connected to a set of fixing mechanisms 2, which include a connecting belt 201, a rotating ring 202, a binding belt 203, a limit block 204, a limit tooth 205, a latch 206, a push plate 207 and a return spring 208. The end of the extension rod 109 is fixedly connected to one end of a set of connecting belts 201, the other end of the connecting belt 201 is fixedly connected to the binding belt 203, and the side wall of the binding belt 203 is fixedly connected to one end of another set of connecting belts 201. The outer wall of the sleeve 101 is rotatably connected to a set of rotating rings 202, and the other set of connecting belts 201 is fixedly connected to the side wall of the rotating ring 202. One end of the strap 203 is fixedly connected to a group of limit blocks 204, and the other end of the strap 203 extends to the inner wall of the limit block 204. The side wall of the strap 203 is fixedly connected to multiple groups of limit teeth 205. The inner wall of the limit block 204 is slidably connected to a group of latches 206. One end of the latch 206 abuts against the side wall of the limit teeth 205, and the other end of the latch 206 is fixedly connected to a group of push plates 207 extending to the outside of the limit block 204. The latch 206 is fixedly connected to one end of a return spring 208 at the connection between the latch and the push plate 207, and the other end of the return spring 208 is fixedly connected to the other end of the limit block 204.

[0039] When using the dumbbells, the strap 203 is put on the wrist, and then the user's hand is placed between the two sets of connecting straps 201 to hold the sleeve 101, so as to prevent the dumbbell from accidentally slipping during the use of the dumbbell, causing the user to be injured. The strap 203 is put on the user's wrist and then the end of the strap 203 is passed through the limit block 204, so that the strap 203 drives the limit tooth 205 to pass through the limit block 204. During this process, the limit tooth 205 contacts the pin 206, so that the pin 206 is pushed and compressed to compress the reset spring 208. When a set of limit teeth 205 passes the pin 206, the reset spring 208 pushes the pin 206 to return to its original position. , so that the limiting tooth 205 is blocked by the latch 206 and cannot slide, thereby making the strap 203 tightly wrapped around the user's wrist and not loose. When the strap 203 needs to be removed from the user's wrist, the push rod is pushed to drive the latch 206 to compress the return spring 208, so that the latch 206 cannot contact the limiting tooth 205. At this time, the strap 203 can be pulled out from the inside of the limiting block 204, so that the user's wrist and the strap 203 are separated. In the process of fixing the strap 203 on the user's wrist, the connecting belt 201 is pulled, so that the extension rod 109 is pulled by the connecting belt 201, thereby making it impossible for the main rod body 1 to adjust the length.

[0040] Please refer to Figure 1-9The locking mechanism 3 includes a fixed tube 301, a sliding groove 302, a bidirectional threaded rod 303, a sliding block 304, a push rod 305, a sliding bar 306, a sponge 307 and a limiting piece 308. The fixed tube 301 is fixedly connected to one end of the sleeve 101, and the outer wall of the sleeve 101 is provided with multiple groups of sliding grooves 302. The inner wall of the fixed tube 301 is rotatably connected to the bidirectional threaded rod 303. The outer wall of the bidirectional threaded rod 303 is threadedly connected with two groups of sliding blocks 304. The side walls of the two groups of sliding blocks 304 are respectively hinged to one end of a group of push rods 305. The other ends of the two groups of push rods 305 on the same side are hinged to a group of sliding bars 306. The bottom end of the inner wall of the sliding bar 306 is fixedly connected to a sponge 307. The top of the sponge 307 is fixedly connected to multiple groups of limiting pieces 308 extending to the outside of the sliding bar 306.

[0041] The user can arrange the counterweight blocks 4 of different weights on the outer wall of the fixed tube 301 according to his own needs, and then rotate the two-way threaded rod 303 so that the two-way threaded rod 303 pushes the two sets of sliders closer to each other, so that the two sets of sliders push the two sets of push rods 305 on the same side on the sliders closer to each other, thereby causing the push rod 305 to push the sliding block 304 to slide toward the outside of the fixed tube 301. During this process, some of the limiting plates 308 are blocked by the inner wall of the counterweight block 4, so that these blocked limiting plates 308 compress the sponge 307 and cannot slide out of the fixed tube 301, and the remaining limiting plates 308 not blocked by the counterweight block 4 extend out of the fixed tube 301, so that the counterweight block 4 is blocked by these limiting plates 308 extending out of the fixed tube 301 and cannot slide out of the fixed tube 301. The existing dumbbell uses a nut to fix the counterweight block 4, but the nut is easy to lose during actual use. The technical solution in this patent avoids this shortcoming.

[0042] When in use, by pushing the two sets of sleeves 101 away from each other, the two sets of slide rods 102 slide out of the sleeves 101, thereby lengthening the total length of the dumbbell, and adjusting the length of the dumbbell. The locking structure pulls the push ring 105 to rotate, so that when the dumbbell is in use, the push ring 105 pushes the clamp 108 closer to the slide rod 102, so that the convex strip on the side wall of the clamp 108 slides into the groove 103 on the outer wall of the slide rod 102.

[0043] Although an embodiment of the present invention has been shown and described, this specific embodiment is merely an explanation of the present invention and is not a limitation of the invention. The specific features, structures, materials or characteristics described may be combined in an appropriate manner in any one or more embodiments or examples. After reading this specification, those skilled in the art may make modifications, substitutions and variations to the embodiment without creative contribution as needed without departing from the principles and purpose of the present invention. However, as long as they are within the scope of the claims of the present invention, they are protected by patent law.

Claims

1. A dumbbell with adjustable length, comprising a main rod (1), characterized in that: The two groups of main rod bodies (1) are fixedly connected together, and the other ends of the two groups of main rod bodies (1) are respectively fixedly connected to a group of locking mechanisms (3), and the outer wall sliding sleeve of the locking mechanism (3) is provided with a counterweight block (4); The main rod body (1) comprises a sleeve (101), a slide rod (102), a groove (103), a ring (104), a push ring (105), a protrusion (106), a rotating arm (107), a chuck (108) and an extension rod (109); the inner walls of the two groups of sleeves (101) are respectively slidably connected with a group of slide rods (102) extending to the outside of the sleeve (101); one end of the two groups of sleeves (101) is respectively fixedly connected with a group of locking mechanisms (3); one end of the two groups of slide rods (102) located outside the sleeve (101) is fixedly connected together; the outer walls of the two groups of slide rods (102) are provided with multiple groups of grooves (103); the other ends of the two groups of sleeves (101) are respectively fixedly connected with a group of rings (104); the two groups of rings (104) are respectively sleeved on the outer wall of one group of slide rods (102); The side wall of the collar (104) is rotatably connected to a push ring (105), the inner wall of the push ring (105) is fixedly connected to multiple groups of protrusions (106) located inside the collar (104), the inner wall of the collar (104) is rotatably connected to one end of multiple groups of rotating arms (107), the other ends of the multiple groups of rotating arms (107) are respectively hinged to a group of chucks (108), and the side walls of the multiple groups of chucks (108) are respectively fixedly connected to multiple groups of convex strips that match the grooves (103); The rotating arm (107) is provided with a set of torsion springs at the connection with the collar (104), the clamp (108) is provided with another set of torsion springs at the connection with the rotating arm (107), and the extension rod (109) is movably connected to the side wall of the collar (104) through the push ring (105); The outer walls of the two groups of sleeves (101) are respectively fixedly connected to a group of fixing mechanisms (2), and the fixing mechanisms (2) include a connecting belt (201), a rotating ring (202), a binding belt (203), a limiting block (204), a limiting tooth (205), a latch (206), a push plate (207) and a reset spring (208). The end of the extension rod (109) is fixedly connected to one end of a group of connecting belts (201), the other end of the connecting belt (201) is fixedly connected to the binding belt (203), and the side wall of the binding belt (203) is fixedly connected to one end of the other group of connecting belts (201). The outer wall of the sleeve (101) is rotatably connected to a group of rotating rings (202), and the other group of connecting belts (201) is fixedly connected to the side wall of the rotating ring (202).

2. The length-adjustable dumbbell according to claim 1, characterized in that: One end of the binding strap (203) is fixedly connected to a set of limiting blocks (204), the other end of the binding strap (203) extends to the inner wall of the limiting block (204), and the side wall of the binding strap (203) is fixedly connected to multiple sets of limiting teeth (205).

3. The length-adjustable dumbbell according to claim 1, characterized in that: The inner wall of the limit block (204) is slidably connected to a group of latches (206), one end of the latches (206) abuts against the side wall of the limit tooth (205), and the other end of the latches (206) is fixedly connected to a group of push plates (207) extending to the outside of the limit block (204), and the latches (206) are fixedly connected to one end of a return spring (208) at the connection between the latches (206) and the push plates (207), and the other end of the return spring (208) is fixedly connected to the other end of the limit block (204).

4. The length-adjustable dumbbell according to claim 1, characterized in that: The locking mechanism (3) comprises a fixed tube (301), a sliding groove (302), a bidirectional threaded rod (303), a sliding block (304), a push rod (305), a sliding bar (306), a sponge (307) and a limiting piece (308); the fixed tube (301) is fixedly connected to one end of the sleeve (101); and the outer wall of the sleeve (101) is provided with a plurality of sliding grooves (302).

5. The length-adjustable dumbbell according to claim 4, characterized in that: The inner wall of the fixed tube (301) is rotatably connected to a bidirectional threaded rod (303), and the outer wall of the bidirectional threaded rod (303) is threadedly connected to two groups of sliding blocks (304). The side walls of the two groups of sliding blocks (304) are respectively hinged to one end of a group of push rods (305), and the other ends of the two groups of push rods (305) on the same side are hinged to a group of sliding bars (306).

6. The length-adjustable dumbbell according to claim 4, characterized in that: The bottom end of the inner wall of the sliding bar (306) is fixedly connected to a sponge (307), and the top end of the sponge (307) is fixedly connected to multiple groups of limiting pieces extending to the outside of the sliding bar (306).

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