An adjustable dumbbell

Abstract

This application discloses an adjustable dumbbell, including a dumbbell assembly and a safety base. The dumbbell assembly includes a dumbbell bar assembly and counterweight dumbbell plates. The dumbbell bar assembly includes a rotating shaft and a limiting sleeve, an adjusting disc, and a limiting cam fitted at its end. A first cavity is formed on the limiting sleeve, and an unlocking slot is formed on the periphery of the limiting sleeve. A sliding locking block is provided in the first cavity. The adjusting disc is built into the first cavity, and a disc limiting groove is formed on the periphery of the adjusting disc. When the limiting cam rotates to a preset angle, the limiting cam is relatively fixed to the corresponding counterweight dumbbell plate. Two sets of counterweight plate slots and two protrusions are provided on the safety base. When the sliding locking block slides to any disc limiting groove of the adjusting disc, the rotating shaft, the adjusting disc, and the limiting sleeve are relatively fixed. When the protrusion is inserted into the unlocking slot and abuts against the sliding locking block, so that the sliding locking block disengages from any disc limiting groove on the adjusting disc, the rotating shaft can drive the adjusting disc and the limiting cam to rotate relative to the limiting sleeve.

Description

Technical Field

[0001] This application relates to the field of sports equipment technology, and in particular to an adjustable dumbbell. Background Technology

[0002] Dumbbells are one of the most popular fitness equipment in daily life. Traditional dumbbells are usually divided into one-piece dumbbells and modular dumbbells. Modular dumbbells can be adjusted in weight, so they can be adapted to more people.

[0003] Modular dumbbells adjust their weight by changing the number of weight plates on the dumbbell bar, thus switching training intensity. Ordinary dumbbells, on the other hand, have weight plates secured with screws at both ends. This necessitates frequent weight plate changes during training, and if the user doesn't install the weight plates properly before starting training, they risk falling off and causing injury. Utility Model Content

[0004] The first objective of this application is to provide an adjustable dumbbell that allows for simpler, more convenient, and safer disassembly, replacement, and installation of the dumbbell's weight plates.

[0005] To achieve the above objectives, this application provides the following technical solution: This application discloses an adjustable dumbbell, which includes a dumbbell assembly and a safety base. The dumbbell assembly includes a dumbbell bar assembly and two sets of detachable weight plates. The dumbbell bar assembly includes a rotating shaft and two limiting sleeves symmetrically fitted on both ends of the rotating shaft, two adjusting discs, and two sets of limiting cams. The limiting sleeves are rotatably fitted onto the ends of the rotating shaft, and a first cavity is formed on the side of the limiting sleeve near the middle of the rotating shaft. An unlocking slot communicating with the first cavity is formed on the periphery of the limiting sleeve. A sliding locking block is provided in the first cavity corresponding to the unlocking slot. The sliding locking block can slide back and forth relative to the unlocking slot along the radial direction of the rotating shaft. The adjusting discs are built into the first cavity and can rotate synchronously with the rotating shaft. Multiple disc limiting grooves are formed on the periphery of the adjusting discs. The two sets of limiting cams correspond to the two sets of weight plates, and each set of limiting cams includes multiple limiting convexities. The wheel has a limit cam that can rotate synchronously with the shaft and is detachably connected to its corresponding weight plate. When each limit cam rotates to a preset angle, the limit cam and its corresponding weight plate are relatively fixed. The safety base has two sets of weight plate slots corresponding to the two sets of weight plates, and two protrusions corresponding to the two sliding lock blocks. When the two sliding lock blocks slide to either of the corresponding turntable limit slots on the adjustment turntable, the shaft, the adjustment turntable, and the limit sleeve are relatively fixed. When the two protrusions are inserted into their respective unlocking slots and abut against their respective sliding lock blocks, so that the two sliding lock blocks are disengaged from either of the turntable limit slots on the two adjustment turntables, the shaft can drive the two adjustment turntables and the two sets of limit cams to rotate relative to the two limit sleeves.

[0006] In one embodiment, the dumbbell bar assembly further includes a grip sleeve and two dials. The grip sleeve is fitted onto the middle section of the rotating shaft so that the rotating shaft can rotate synchronously with the grip sleeve. The two dials are respectively fitted onto both ends of the grip sleeve and can rotate synchronously with the grip sleeve. A first cavity is opened on the side of the limiting sleeve near the dials. The dials are rotatably connected to the openings of the corresponding first cavities and close the first cavities. A second cavity is opened on the side of the dials near the first cavity. A first bushing extending toward the first cavity is provided at the center of the second cavity. An adjustment dial is fitted onto the first bushing so that the adjustment dial can rotate with the dials.

[0007] In one embodiment, multiple limiting teeth are evenly arranged on the periphery of the adjusting turntable, and a turntable limiting groove is formed between any two adjacent limiting teeth; a sliding groove is provided in the first cavity corresponding to the unlocking slot, and a first spring and a sliding locking block are provided in the sliding groove. The sliding locking block abuts against the sliding groove through the first spring, so that the sliding locking block can reciprocate along the sliding groove with the first spring.

[0008] In one embodiment, the adjusting turntable has multiple positioning guide holes corresponding to multiple turntable limiting slots; the first cavity has at least two centrally symmetrical boss structures extending toward the adjusting turntable corresponding to the multiple positioning guide holes, each boss structure has a mounting slot, and a second spring and a guide ball are provided in the mounting slot. The guide ball abuts against the mounting slot and the adjusting turntable through the second spring; wherein, during the rotation of the adjusting turntable, when the guide ball abuts against the positioning guide hole through the second spring, the sliding lock block can be inserted into the turntable limiting slot through the first spring.

[0009] In one embodiment, each limiting sleeve includes a first limiting wall, a connecting bridge block, and a second limiting wall. The first limiting wall and the second limiting wall are sequentially sleeved on the end of the rotating shaft, and the first limiting wall and the second limiting wall are connected by the connecting bridge block. A first cavity is opened on the side of the first limiting wall near the gripping sleeve. Multiple limiting cams are evenly distributed between the first limiting wall and the second limiting wall.

[0010] In one embodiment, the protrusion includes an unlocking top block and a turntable guide groove; wherein, when the protrusion is inserted into the corresponding unlocking slot, the unlocking top block abuts against the sliding lock block, so that when the sliding lock block disengages from the turntable limiting groove, multiple limiting teeth are located in the turntable guide groove and can slide along the turntable guide groove.

[0011] In one embodiment, each weighted dumbbell plate has a rotating groove at its center, and a cam slot extending radially along the limiting cam is formed on one side of the rotating groove. A limiting chamfer connects the rotating groove and the cam slot, and the limiting cam can slide into the rotating groove through the cam slot. The width of the cam slot is smaller than the outer diameter of the maximum point of the limiting cam and larger than the outer diameter of the minimum point of the limiting cam. The inner diameter of the rotating groove is adapted to the outer diameter of the maximum point of the limiting cam.

[0012] This utility model discloses an adjustable dumbbell. When the adjustable dumbbell is not in use, several weight plates are inserted into the weight plate slots of the safety base. The dumbbell bar assembly is connected to the cam slots on the weight plates via several limiting cams. The protrusion on the safety base passes through the unlocking slot at the bottom of the first limiting wall of the limiting sleeve and abuts against the sliding lock in the second cavity of the first limiting wall. Under the action of the dumbbell bar assembly's own weight and the action of the protrusion abutting against the sliding lock, the sliding lock block rises along the slide groove in the second cavity and compresses the first spring, causing the sliding lock block to disengage from the turntable limiting groove on the adjusting turntable. At this time, the dumbbell assembly is in the unlocked state, that is, the rotating shaft can synchronously drive the adjusting turntable, the scale, and several limiting cams to rotate relative to the limiting sleeve, and several limiting teeth on the edge of the adjusting turntable insert into the turntable guide groove on the protrusion during rotation and slide within the turntable guide groove. When the user needs to use the adjustable dumbbell, they only need to rotate the shaft. During the rotation, the limiting cam on the shaft rotates within the corresponding rotating groove of the weight plate. When the protruding limiting structure on the limiting cam abuts against the limiting chamfer on the weight plate, the dumbbell assembly can drive the weight plate to disengage from the safety base in a vertically upward direction. At this time, the protrusion on the safety base disengages from the unlocking slot on the limiting sleeve, and the sliding lock block resets under the elastic force of the first spring and inserts into the limiting groove of the adjusting disc, thereby restricting the shaft from driving the adjusting disc to rotate, achieving self-locking and thus enabling the installation of the weight plate. When the protruding limiting structure on the limiting cam disengages from the limiting chamfer on the weight plate during rotation, the dumbbell assembly can drive the limiting cam to disengage from the weight plate in a vertically upward direction, thus enabling the removal of the weight plate. The adjustable dumbbell proposed by this utility model allows users to more easily, conveniently, and safely remove, replace, and install weight plates. Attached Figure Description

[0013] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. Wherein: Figure 1 This is a schematic diagram of the structure of an adjustable dumbbell provided in an embodiment of this application; Figure 2 This application provides a schematic diagram of the structure of an adjustable dumbbell assembly. Figure 3 for Figure 2 A partially enlarged structural diagram of section A in the middle; Figure 4 This application provides a schematic diagram of the structure of an adjustable dumbbell safety base. Figure 5 for Figure 4A partially enlarged structural diagram of section B in the middle section; Figure 6 This is a partial exploded structural diagram of an adjustable dumbbell assembly provided in an embodiment of this application; Figure 7 This is an exploded structural diagram of an adjustable dumbbell bar assembly at a first angle, provided in an embodiment of this application. Figure 8 for Figure 7 A partially enlarged structural diagram of section C in the middle; Figure 9 for Figure 7 A partially enlarged structural diagram of section D in the middle section; Figure 10 for Figure 7 A partially enlarged structural diagram of section E in the middle section; Figure 11 for Figure 7 A partially enlarged structural diagram of the F section of the structure; Figure 12 This is an exploded structural diagram of an adjustable dumbbell bar assembly at a second angle, provided as an embodiment of this application. Figure 13 for Figure 12 A partially enlarged structural diagram of the G section; Figure 14 for Figure 12 A partially enlarged structural diagram of the H-section in the middle section; Figure 15 for Figure 12 A partially enlarged structural diagram of the middle I section; Figure 16 This is a cross-sectional structural diagram of an adjustable dumbbell with counterweight plates in a locked state and an unlocked state, as provided in an embodiment of this application.

[0014] Explanation of reference numerals in the attached figures: 1. Dumbbell assembly; 1a. Dumbbell bar assembly; 101, Rotating shaft; 101a, First limiting groove; 101b, First snap ring groove; 102. Grip sleeve; 102a. First shaft hole; 102b. Second limiting groove; 102c. Second retaining ring groove; 103. Anti-slip sleeve; 104. Snap ring for the second shaft; 105, dial; 105a, second cavity; 105b, first bushing; 105c, second shaft hole; 105d, first limiting surface; 105e, third limiting groove; 105f, fixing pin; 105g, weight scale; 106. Adjusting turntable; 106a. Third shaft hole; 106b. Second limiting surface; 106c. Mounting pin hole; 106d. Limiting tooth; 106e. Turntable limiting groove; 106f. Positioning guide hole; 107. Limiting sleeve; 107a. First limiting wall; 107b. Connecting bridge block; 107c. Second limiting wall; 107d. Fourth shaft hole; 107e. First cavity; 107f. Unlocking slot; 107g. Slide groove; 107h. Sliding lock block; 107i. First spring; 107j. Lock block mounting piece; 107k. Boss structure; 107l. Mounting slot; 107m. Second spring; 107n. Guide ball; 107o. Pointer indicator; 107p. Fifth shaft hole; 107q. Third cavity; 108. First shaft retaining ring; 109. Bearing; 110. End cap; 111, limiting cam; 111a, sixth shaft hole; 111b, third limiting surface; 111c, cam insertion groove; 111d, second bushing; 111e, cam limiting flat groove; 111f, raised limiting structure; 112. Weighted dumbbell plate; 112a. Cam slot; 112b. Rotating groove; 112c. Limiting chamfer; 2. Safety base; 201. Counterweight slot; 202. Protrusion; 202a. Unlocking top block; 202b. Turntable guide groove. Detailed Implementation

[0015] The present application will now be described in detail with reference to the accompanying drawings and embodiments. Various examples are provided by way of explanation 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 application without departing from the scope or spirit thereof. 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 application encompass such modifications and variations that fall within the scope of the appended claims and their equivalents.

[0016] In the description of this application, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," and "bottom," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and do not require that this application be constructed and operated in a specific orientation, and therefore should not be construed as limiting this application. The terms "connected," "linked," and "set up" used in this application should be interpreted broadly. For example, they can refer to fixed connections or detachable connections; direct connections or indirect connections through intermediate components; wired connections, radio connections, or wireless communication signal connections. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances.

[0017] The accompanying drawings illustrate one or more examples of this application. The detailed description uses numerical and alphabetic designations to refer to features in the drawings. Similar or analogous designations in the drawings and description have been used to refer to similar or analogous parts of this application. As used herein, the terms “first,” “second,” and “third,” etc., are used interchangeably to distinguish one component from another and are not intended to indicate the location or importance of individual components.

[0018] like Figures 1 to 16 As shown in the embodiment of this application, an adjustable dumbbell is provided. The adjustable dumbbell includes a dumbbell assembly 1 and a safety base 2. The dumbbell assembly 1 includes a dumbbell bar assembly 1a and multiple weight plates 112 of different weight specifications. The dumbbell bar assembly 1a includes a pivot 101, a grip sleeve 102, two limiting sleeves 107, two adjusting dials 106, two sets of limiting cams 111, and two scales 105. The safety base 2 is provided with multiple weight plate slots 201. The safety base 2 can hold uninstalled weight plates 112 or directly hold the installed dumbbell assembly 1 through the multiple weight plate slots 201.

[0019] Specifically, the rotating shaft 101 is provided with a first limiting flat groove 101a and a first retaining ring groove 101b. The grip sleeve 102 is sleeved on the middle section of the rotating shaft 101 through the first shaft hole 102a. The grip sleeve 102 is made of a material that can produce elastic deformation, so that when the user grips the grip sleeve 102 tightly, the elastic deformation generated by the grip sleeve 102 can drive the rotating shaft 101 to rotate synchronously. The end of the grip sleeve 102 is provided with a second limiting flat groove 102b and a second retaining ring groove 102c. The dial 105 is provided with a second shaft hole 105c. The wall of the second shaft hole 105c is provided with a first limiting surface 105d. The dial 105 is sleeved on the end of the grip sleeve 102 through the second shaft hole 105c, and the first limiting surface 105d cooperates with the second limiting flat groove 102b so that the dial 105 can rotate synchronously with the grip sleeve 102.

[0020] Specifically, the limiting sleeve 107 includes a first limiting wall 107a, a second limiting wall 107c, and a connecting bridge block 107b connecting the first limiting wall 107a and the second limiting wall 107c. The first limiting wall 107a has a fourth shaft hole 107d, which is rotatably connected to the rotating shaft 101. A first circumferential retaining ring 108 engages with a first retaining ring groove 101b on the rotating shaft 101 to limit the axial movement of the limiting sleeve 107 on the rotating shaft 101. The second limiting wall 107c has a fifth shaft hole 107p, in which a bearing 109 is installed. The rotating shaft 101 is rotatably connected to the second limiting wall 107c via the bearing 109, which allows for more precise and smooth rotation of the rotating shaft 101. The second limiting wall 107c has a third cavity 107q on the side opposite to the first limiting wall 107a. An end cap 110 is fastened to the opening of the third cavity 107q, and the end cap 110 can protect the bearing 109.

[0021] Specifically, a first cavity 107e is formed on the side of the first limiting wall 107a near the dial 105, and a second cavity 105a is formed on the side of the dial 105 near the first limiting wall 107a. The dial 105 is rotatably connected to the opening of the first cavity 107e and closes the first cavity 107e. A first bushing 105b extending toward the first cavity 107e is provided around the second shaft hole 105c in the second cavity 105a, and a third limiting groove 105e is formed on the first bushing 105b. The adjusting turntable 106 has a third shaft hole 106a, and a second limiting surface 106b is provided on the wall of the third shaft hole 106a. The adjusting turntable 106 is built into the second cavity 105a and is sleeved on the first bushing 105b through the third shaft hole 106a. The second shaft retaining spring 104 and the second retaining spring groove 102c cooperate to restrict the axial movement of the adjusting turntable 106 on the rotating shaft 101. Under the cooperation of the second limiting surface 106b and the third limiting groove 105e, the adjusting turntable 106 can rotate synchronously with the scale 105.

[0022] In some embodiments, a plurality of fixing pins 105f are provided on the side of the dial 105 near the adjusting turntable 106, surrounding the second shaft hole 105c. Corresponding to the plurality of fixing pins 105f, the adjusting turntable 106 has a plurality of mounting pin holes 106c surrounding the third shaft hole 106a. The adjusting turntable 106 is connected to the fixing pins 105f on the dial 105 through the mounting pin holes 106c, which can further reduce the relative rotation between the dial 105 and the adjusting turntable 106, thereby improving the accuracy during adjustment.

[0023] Specifically, the adjusting turntable 106 has a plurality of limiting teeth 106d evenly distributed around its periphery, extending toward the first cavity 107e, and a turntable limiting groove 106e is formed between any two adjacent limiting teeth 106d. A sliding groove 107g is provided on the side of the first limiting wall 107a near the adjusting turntable 106. A first spring 107i and a sliding locking block 107h are provided in the sliding groove 107g. A locking block mounting piece 107j is installed on the side of the sliding groove 107g near the adjusting turntable 106 to prevent the sliding locking block 107h from disengaging from the sliding groove 107g. Under the action of the first spring 107i, the sliding locking block 107h can reciprocate within the sliding groove 107g and can be inserted into any turntable limiting groove 106e. When the sliding locking block 107h is inserted into the turntable limiting groove 106e, the adjusting turntable 106 cannot rotate relative to the limiting sleeve 107. An unlocking slot 107f is provided on the periphery of the first limiting wall 107a, corresponding to the sliding locking block 107h. A protrusion 202 is provided on the safety base 2 corresponding to the unlocking slot 107f. The protrusion 202 includes an unlocking top block 202a at the top and a turntable guide groove 202b below the unlocking top block 202a. When the dumbbell assembly 1 or dumbbell bar assembly 1a is placed on the safety base 2, the protrusion 202 is inserted into the corresponding unlocking slot 107f, and the unlocking top block 202a abuts against the sliding locking block 107h. Under the weight of the dumbbell assembly 1 or dumbbell bar assembly 1a and the action of the first spring 107i, the sliding locking block 107h slides vertically upward along the slide groove 107g and disengages from the turntable limiting groove 106e. When the sliding lock block 107h is completely disengaged from the turntable limit groove 106e, the dumbbell assembly 1 or dumbbell bar assembly 1a switches to the unlocked state, and the limiting teeth 106d on the periphery of the turntable 106 slide into the turntable guide groove 202b on the protrusion 202, and the limiting teeth 106d can slide in the turntable guide groove 202b.

[0024] In some embodiments, the adjusting turntable 106 is further provided with a plurality of positioning guide holes 106f surrounding the third shaft hole 106a. The first limiting wall 107a is provided with at least two centrally symmetrical boss structures 107k on the side near the adjusting turntable 106, corresponding to the plurality of positioning guide holes 106f. Each boss structure 107k is provided with a mounting slot 107l. A second spring 107m and a guide ball 107n are provided in the mounting slot 107l. The guide ball 107n abuts against the mounting slot 107l and the adjusting turntable 106 through the second spring 107m. During the rotation of the adjustment turntable 106, the guide ball 107n can make the rotation of the adjustment turntable 106 smoother. When the guide ball 107n abuts against the positioning guide hole 106f through the second spring 107m, it proves that the adjustment turntable 106 has rotated to the preset angle. At this time, when the unlocking top block 202a of the protrusion 202 on the safety base 2 disengages from the sliding lock block 107h, the sliding lock block 107h can be inserted into the turntable limit groove 106e by the elastic force of the first spring 107i, thereby switching the dumbbell assembly 1 or dumbbell bar assembly 1a to the locked state.

[0025] Specifically, each limiting cam 111 has a sixth shaft hole 111a, and a third limiting surface 111b is provided on the wall of the sixth shaft hole 111a. Multiple limiting cams 111 are evenly distributed between the first limiting wall 107a and the second limiting wall 107c, and are respectively connected to the rotating shaft 101 through the sixth shaft hole 111a. The third limiting surface 111b in the sixth shaft hole 111a cooperates with the first limiting groove 101a on the rotating shaft 101 so that the limiting cam 111 can rotate synchronously with the rotating shaft 101.

[0026] In some embodiments, a second bushing 111d is provided around the sixth shaft hole 111a on the side of each limiting cam 111 near the first limiting wall 107a. The end of the second bushing 111d is provided with a cam limiting groove 111e. Each limiting cam 111 has a cam insertion groove 111c adapted to the cam limiting groove 111e on the side opposite to the second bushing 111d and corresponding to the sixth shaft hole 111a. When multiple limiting cams 111 are sequentially sleeved onto the rotating shaft 101, each limiting cam 111 cooperates with the adjacent limiting cams 111 on both sides through the cam limiting groove 111e and the cam insertion groove 111c, thereby achieving a compact installation between multiple limiting cams 111, further improving the linkage of each limiting cam 111 during rotation, thereby improving adjustment accuracy and safety stability.

[0027] Specifically, each limiting cam 111 has multiple evenly distributed protruding limiting structures 111f on its periphery at a preset angle. These multiple protruding limiting structures 111f allow the limiting cam 111 to have a maximum and a minimum circumscribed circle size. Each counterweight dumbbell plate 112 has a rotating groove 112b in its center, and a radially extending cam slot 112a is formed on one side of the rotating groove 112b. A limiting chamfer 112c connects the cam slot 112a and the rotating groove 112b. The width of the cam slot 112a is smaller than the maximum circumscribed circle size of the limiting cam 111 but larger than its minimum circumscribed circle size, allowing the limiting cam 111 to slide along the cam slot 112a into the rotating groove 112b. The diameter of the rotating groove 112b is adapted to the maximum circumscribed circle size of the limiting cam 111, allowing the limiting cam 111 to rotate freely within the rotating groove 112b. When the limiting cam 111 rotates in the rotating groove 112b, if the protruding limiting structure 111f of the limiting cam 111 is restricted by the cam slot 112a and the limiting chamfer 112c, then the limiting cam 111 and the counterweight dumbbell plate 112 are locked, and the limiting cam 111 cannot slide from the rotating groove 112b to the cam slot 112a. When the limiting cam 111 rotates in the rotating groove 112b, if the protruding limiting structure 111f of the limiting cam 111 can slide from the rotating groove 112b to the cam slot 112a, then the limiting cam 111 and the counterweight dumbbell plate 112 are unlocked, and the limiting cam 111 can slide along the cam slot 112a until it disengages from the counterweight dumbbell plate 112.

[0028] Specifically, multiple weight plates 112 correspond to various weight specifications. Multiple weight markings 105g are evenly distributed around the second shaft hole 105c at a preset angle on the surface of the dial 105 opposite to the limiting sleeve 107. Each weight marking 105g corresponds to a weight combination of different weight specifications of the weight plates 112. A pointer indicator 107o is provided on the periphery of the first limiting wall 107a. During the rotation of the dial 105 and the adjusting turntable 106 with the rotating shaft 101, when the pointer indicator 107o points to a certain weight marking 105g, it indicates that the combination of multiple weight plates 112 corresponding to that weight marking 105g has been relatively fixed with the corresponding limiting cam 111. The weight markings 105g and the pointer indicator 107o allow the user to have a more specific and precise adjustment target when using the adjustable dumbbell to achieve the training purpose.

[0029] In some embodiments, the grip sleeve 102 is provided with an anti-slip sleeve 103 made of a flexible material such as rubber and with anti-slip patterns on its surface, so as to increase the friction when the user grips it.

[0030] As can be seen from the above description, the embodiments of this utility model achieve the following technical effects: When the adjustable dumbbell provided in the above embodiment of the present invention is in an unused state, several weight dumbbell plates 112 are inserted into the weight plate slots 201 of the safety base 2, and the dumbbell bar assembly 1a is inserted into the cam slots 112a on the weight dumbbell plates 112 through several limiting cams 111 on it; the protrusion 202 on the safety base 2 passes through the unlocking slot 107f at the bottom of the first limiting wall 107a of the limiting sleeve 107 and abuts against the sliding lock in the second cavity 105a of the first limiting wall 107a. Under the weight of the dumbbell assembly 1a and the action of the protrusion 202 abutting against the sliding lock, the sliding lock block 107h rises along the slide groove 107g in the second cavity 105a and compresses the first spring 107i, causing the sliding lock block 107h to disengage from the turntable limiting groove 106e on the adjusting turntable 106. At this time, the dumbbell assembly 1 is in the unlocked state, that is, the rotating shaft 101 can synchronously drive the adjusting turntable 106, the scale 105 and several limiting cams 111 to rotate relative to the limiting sleeve 107, and several limiting teeth 106d on the edge of the adjusting turntable 106 insert into the turntable guide groove 202b on the protrusion 202 during the rotation and slide in the turntable guide groove 202b. When the user needs to use the adjustable dumbbell, they only need to rotate the pivot 101. During the rotation of the pivot 101, the limiting cam 111 on the pivot 101 rotates within the rotation groove 112b of its corresponding weight dumbbell plate 112. When the protruding limiting structure 111f on the limiting cam 111 abuts against the limiting chamfer 112c on the weight dumbbell plate 112, the dumbbell bar assembly 1a can drive the weight dumbbell plate 112 to disengage from the safety base 2 in a vertically upward direction. At this time, the protrusion 202 on the safety base 2 disengages from the unlocking slot 107f on the limiting sleeve 107, and the dumbbell bar assembly 1a can drive the weight dumbbell plate 112 to disengage from the safety base 2. The movable locking block 107h resets under the elastic force of the first spring 107i and inserts into the turntable limiting groove 106e of the adjusting turntable 106, thereby restricting the rotation of the adjusting turntable 106 driven by the rotating shaft 101 to achieve self-locking and thus realize the installation of the counterweight dumbbell plate 112; when the protruding limiting structure 111f on the limiting cam 111 disengages from the limiting chamfer 112c of the counterweight dumbbell plate 112 during rotation, the dumbbell rod assembly 1a can drive the limiting cam 111 to disengage from the counterweight dumbbell plate 112 in a vertically upward direction, thereby realizing the disassembly of the counterweight dumbbell plate 112. The adjustable dumbbell proposed by this utility model allows users to more easily, conveniently and safely disassemble, replace and install the counterweight dumbbell plate 112.

[0031] The above descriptions are merely some embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. An adjustable dumbbell, characterized in that, include: Dumbbell assembly and safety base; The dumbbell assembly includes a dumbbell bar assembly and two sets of detachable weight plates; The dumbbell bar assembly includes: a rotating shaft and two limiting sleeves symmetrically fitted on both ends of the rotating shaft, two adjusting turntables and two sets of limiting cams; The limiting sleeve is rotatably sleeved on the end of the rotating shaft, and a first cavity is opened on the side of the limiting sleeve near the middle section of the rotating shaft. An unlocking slot communicating with the first cavity is opened on the periphery of the limiting sleeve. A sliding locking block is provided in the first cavity corresponding to the unlocking slot. The sliding locking block can slide back and forth relative to the unlocking slot along the radial direction of the rotating shaft. The adjusting turntable is built into the first cavity and can rotate synchronously with the rotating shaft. Multiple turntable limiting grooves are opened on the periphery of the adjusting turntable. The two sets of limiting cams correspond to the two sets of counterweight dumbbell plates. Each set of limiting cams includes multiple limiting cams. Each limiting cam can rotate synchronously with the rotating shaft, and its corresponding counterweight dumbbell plate can be detachably inserted and inserted. When each limiting cam rotates to a preset angle, the limiting cam and its corresponding counterweight dumbbell plate are relatively fixed. The safety base has two sets of counterweight plate slots corresponding to the two sets of counterweight dumbbell plates, and the safety base has two protrusions corresponding to the two sliding lock blocks. in: When the two sliding locking blocks slide to either of the turntable limiting slots on their respective adjusting turntables, the rotating shaft, the adjusting turntable, and the limiting sleeve are relatively fixed to each other; When the two protrusions are inserted into their respective unlocking slots and abut against their respective sliding lock blocks, so that the two sliding lock blocks disengage from either of the limiting slots on the two adjusting turntables, the rotating shaft can drive the two adjusting turntables and the two sets of limiting cams to rotate relative to the two limiting sleeves.

2. The adjustable dumbbell according to claim 1, characterized in that, The dumbbell bar assembly also includes a grip sleeve and two dials. The grip sleeve is fitted onto the middle section of the pivot so that the pivot can rotate synchronously with the grip sleeve. The two dials are respectively fitted onto both ends of the grip sleeve and can rotate synchronously with the grip sleeve. The first cavity is formed on the side of the limiting sleeve near the dial, and the dial is rotatably connected to the opening of the first cavity corresponding to it, thus closing the first cavity; A second cavity is provided on the side of the dial near the first cavity. A first bushing extending toward the first cavity is provided at the center of the second cavity. The adjusting dial is sleeved on the first bushing so that the adjusting dial can rotate with the dial.

3. An adjustable dumbbell according to claim 2, characterized in that, The adjustment turntable is evenly provided with multiple limiting teeth on its periphery, and the turntable limiting groove is formed between any two adjacent limiting teeth. The first cavity has a groove corresponding to the unlocking slot. The groove contains a first spring and a sliding lock block. The sliding lock block abuts against the groove via the first spring, so that the sliding lock block can reciprocate along the groove with the first spring.

4. An adjustable dumbbell according to claim 3, characterized in that, The adjusting turntable has multiple positioning guide holes corresponding to the multiple turntable limiting slots; The first cavity is provided with at least two centrally symmetrical boss structures that extend toward the adjustment turntable, corresponding to the plurality of positioning guide holes. Each boss structure is provided with a mounting slot. A second spring and a guide ball are provided in the mounting slot. The guide ball abuts against the mounting slot and the adjustment turntable through the second spring. During the rotation of the adjusting turntable, when the guide ball abuts against the positioning guide hole via the second spring, the sliding lock block can be inserted into the turntable limiting groove via the first spring.

5. An adjustable dumbbell according to claim 2, characterized in that, Each of the limiting sleeves includes a first limiting wall, a connecting bridge block, and a second limiting wall. The first limiting wall and the second limiting wall are sequentially sleeved on the end of the rotating shaft, and the first limiting wall and the second limiting wall are connected by the connecting bridge block. The first cavity is formed on the side of the first limiting wall near the grip sleeve; The plurality of limiting cams are evenly distributed between the first limiting wall and the second limiting wall.

6. An adjustable dumbbell according to claim 3, characterized in that, The protrusion includes an unlocking top block and a turntable guide groove; When the protrusion is inserted into the corresponding unlocking slot, the unlocking top block abuts against the sliding lock block, so that when the sliding lock block disengages from the turntable limiting groove, the plurality of limiting teeth are located in the turntable guide groove and can slide along the turntable guide groove.

7. An adjustable dumbbell according to claim 1, characterized in that, Each of the weighted dumbbell plates has a rotating groove at its center, and a cam slot extending radially along the limiting cam is formed on one side of the rotating groove. A limiting chamfer is connected between the rotating groove and the cam slot, and the limiting cam can slide into the rotating groove through the cam slot. The width of the cam slot is smaller than the outer diameter of the maximum point of the limiting cam and larger than the outer diameter of the minimum point of the limiting cam. The inner diameter of the rotating groove is adapted to the outer diameter of the maximum point of the limiting cam.

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