Weight-adjustable dumbbell structure

Abstract

Weight-adjustable dumbbell structure (11, 12, 13, 14, 15), characterized in that it comprises: a main body (30) with a handle (31), two weight-loading sections (32A, 32B) each attached to two ends of the handle (31), and two channels (33A, 33B) extending along a horizontal axis, each of the weight-loading sections (32A, 32B) having a connecting surface (322) and a through-hole (323) penetrating the connecting surface (322), the two channels (33A, 33B) each being connected to the through-holes (323) of the two weight-loading sections (32A, 32B); two weight units (40A, 40B), each of the weight units (40A, 40B) comprising several weight plates (41) which are detachably stacked and combined, each of the weight plates (41) comprising a first connecting surface (411), a second connecting surface (412) facing away from the first connecting surface (411), and a connecting hole (413) which penetrates the first connecting surface (411) and the second connecting surface (412); and an adjusting device (50, 50', 70) comprising a control unit (52, 71) and two crossbars (51A, 51B, 72A, 72B), wherein the two crossbars (51A, 51B, 72A, 72B) are each inserted into the two channels (33A, 33B) so that the two crossbars (51A, 51B, 72A, 72B) can be controlled by the control unit (52, 71) to slide along the horizontal axis; wherein the two weight-loading sections (32A, 32B) of the main body (30) comprise a first weight-loading section (32A) and a second weight-loading section (32B); the two weight units (40A, 40B) comprise a first weight unit (40A) and a second weight unit (40B); one of the weight plates (41) of the first weight unit (40A) is detachably connected to the connecting surface (322) of the first weight-loading section (32A), and the connecting holes (413) of the weight plates (41) of the first weight unit (40A) are interconnected and are connected to the through hole (323) of the first weight-loading section (32A); wherein one of the weight plates (41) of the second weight unit (40B) is detachably connected to the connecting surface (322) of the second weight load section (32B), and the connecting holes (413) of the weight plates (41) of the second weight unit (40B) are connected to each other and to the through hole (323) of the second weight load section (32B); wherein the two crossbars (51A, 51B, 72A, 72B) of the adjusting device (50, 50', 70) comprise a first crossbar (51A, 72A) and a second crossbar (51B, 72B); wherein the first crossbar (51A, 72A) can be controlled by the control unit (52, 71) to optionally pass through the through hole (323) of the first weight loading section (32A) to slide to the connecting hole (413) of at least one of the weight plates (41) of the first weight unit (40A); wherein the second crossbar (51B, 72B) can be controlled by the control unit (52, 71) so that it optionally extends through the through hole (323) of the second weight load section (32B) to slide to the connecting hole (413) of at least one of the weight plates (41) of the second weight unit (40B).

Description

BACKGROUND OF THE INVENTION 1. Field of the invention

[0001] The present invention relates to dumbbells for fitness activities such as strength training and in particular to a weight-adjustable dumbbell structure. 2. Description of the state of the art

[0002] Dumbbells are training devices widely used by the general public. Conventional dumbbells are monolithic and their weight cannot be adjusted. For training with varying resistance, a dumbbell set with several dumbbells of different weights is required. With some dumbbells, the user can adjust the total weight by adding or removing weight plates at either end of the handle.

[0003] In particular, with conventional dumbbells, where the user can adjust the weight by adding or removing weight plates, the combination of handle and weight plates is usually achieved by inserting two locking bars through the required number of weight plates and then securely screwing the locking bars to both ends of the handle. However, when adjusting the weight, the user has to unscrew the locking bars from the handle, remove or add weight plates, and then securely screw the locking bars back onto the handle. This type of adjustment is cumbersome and therefore needs improvement. SUMMARY OF THE INVENTION

[0004] The present invention was developed taking into account the aforementioned circumstances. The main object of the present invention is to provide a structure for a dumbbell with adjustable weight that allows for quick and easy weight adjustment by adding or removing weight plates.

[0005] To solve the aforementioned problem, the present invention provides a structure or assembly for an adjustable-weight dumbbell, comprising a main body, two weight units, and an adjustment device. The main body includes a handle, two weight-bearing parts, each attached to opposite ends of the handle, and two channels extending along a horizontal axis. Each weight-bearing part comprises a connecting surface and a through-hole penetrating the connecting surface. The two channels each communicate with the through-holes of the two weight-bearing parts. Each weight unit comprises several weight plates that are removable and stacked one above the other.Each of the weight plates comprises a first connecting surface, a second connecting surface opposite the first connecting surface, and a connecting hole that penetrates both the first and second connecting surfaces. The adjustment device comprises a control unit and two crossbars. The two crossbars are each inserted into the two channels such that they can be controlled by the control unit to slide along the horizontal axis. The two weight-loading sections of the main body comprise a first weight-loading section and a second weight-loading section. The two weight units comprise a first weight unit and a second weight unit.One of the weight plates of the first weight unit is detachably connected to the connecting surface of the first weight load section, and the connecting holes of the weight plates of the first weight unit are interconnected and align with the through-hole of the first weight load section. One of the weight plates of the second weight unit is detachably connected to the connecting surface of the second weight load section, and the connecting holes of the weight plates of the second weight unit are interconnected and align with the through-hole of the second weight load section. The two crossbars of the adjusting device comprise a first crossbar and a second crossbar.The first crossbar can be controlled by the control unit so that it optionally extends through the through-hole of the first weight holder to slide to the connecting hole of at least one of the weight plates of the first weight unit. The second crossbar can be controlled by the control unit so that it optionally extends through the through-hole of the second weight holder to slide to the connecting hole of at least one of the weight plates of the second weight unit.

[0006] From the foregoing description, it is clear that in the present invention, the two crossbars extending from the weight-bearing parts at both ends of the handle are used to connect the weight plates, and that the user can operate the control unit to adjust the number of weight plates connected by each crossbar. Therefore, the user only needs to operate the control unit with a simple action and then lift the handle to obtain the barbell with the required number of weight plates. This type of weight adjustment is very quick and easy.

[0007] The connecting surface of the weight-loading section of the main body is preferably connected to the first connecting surface of the weight plate in a downward sliding manner and separated from the first connecting surface in an upward sliding manner. With each pair of adjacent weight plates, the second connecting surface of one of the weight plates is moved downwards with the first connecting surface of the other weight plate and separated from the first connecting surface in an upward sliding manner.

[0008] If the weight plates are not connected by the crossbars, they can still be connected to each other via their first and second connection surfaces and to the connection surfaces of the weight-bearing parts of the main body. If some of the weight plates are connected by the crossbars and the user lifts the main body, the plates connected by the crossbars will be securely attached to the main body and thus lifted along with it, while they will quickly and smoothly separate from the plates not connected by the crossbars. When the user is finished using the barbell or wishes to change the number of weight plates, they can easily recombine all the weight plates of the same weight unit by simply aligning the barbell with the unused weight plates and setting it down.

[0009] Each of the weight plates preferably includes a connecting section that projects from the first connecting surface. Each of the weight-loading sections and each of the weight plates includes a connecting recess. The connecting recess of the weight-loading section is recessed relative to the connecting surface. The connecting recess of the weight plate is recessed relative to the second connecting surface. The combination recess is designed to embed the combination section in a downward sliding manner. Consequently, the combinations of the aforementioned combination sections with the recessed combination recesses make the combinations between the weight plates and the combinations between the weight plates and the weight-loading sections more precise and secure.

[0010] Preferably, each of the combination recesses comprises an upper section that is relatively shallower and a lower section that is relatively deeper. The lower section of the combination recess of the weight-loading section extends from a lower edge of the upper section of the combination recess of the weight-loading section to an underside of the weight-loading section. The lower section of the combination recess of the weight plate extends from a lower edge of the upper section of the combination recess of the weight plate to an underside of the weight plate.

[0011] This design of the connection recess facilitates smooth assembly of the two components when connecting one weight plate to another or when connecting one weight plate to a weight load section, even if they are slightly inclined towards each other.

[0012] In some embodiments of the present invention, each of the two weight-receiving parts of the main body and the weight plates comprises a top surface and a receiving groove extending downwards from the top surface. The receiving groove and the through-hole of each of the weight-receiving parts are interconnected. The receiving groove and the connecting hole of each of the weight plates are interconnected. The control unit of the adjusting device comprises two control units connected to one end of the first crossbar and one end of the second crossbar. The two control units are each located in the receiving grooves of the two weight-receiving parts of the main body and can be moved by the user to the receiving grooves of the two weight units.

[0013] This allows the user to move each of the control units to adjust the weight of the barbell's weight plates. Furthermore, the two control assemblies are housed in the slots of the two weight-loading sections of the main body or in the slots of the two weight units, meaning that both control assemblies are installed on the barbell, saving space and offering ease of use.

[0014] In one embodiment, each of the receiving grooves is provided on its inner wall with at least one first stop element. Each of the control units comprises a vertical rod, an elastic element, and a locking element. The vertical rod is attached to the crossbar. The locking element is slid onto the vertical rod. A confined space is located between the locking element and the vertical rod. The elastic element is clamped within this confined space. The locking element is provided on its outer surface with at least one second stop element. Each of the control assemblies is positioned in a positioning state within one of the receiving grooves and can be moved into a raised state by the user pulling up the locking element.When the control assembly is in the positioning state, the locking element is influenced by the elastic element such that the second stop is positioned against the first stop of the receiving groove in which the locking element is located. When the control assembly is in the upward position, the second stop of the locking element disengages from the first stop of the receiving groove in which the locking element is located, allowing the user to move the control unit and the crossbar attached to the vertical rod of the control unit along the horizontal axis. Consequently, by pulling the locking element of the control unit upward, the user can move the control unit and the associated crossbar to adjust the weight of the barbell plates.When the user moves the control unit to the desired position, they simply release the locking element to securely fix the control unit in place. This configuration is quick and easy to use and makes the entire barbell structurally stable.

[0015] Preferably, the vertical rod remains stationary when the control unit is moved from the positioned state to the raised state, and the confined space is reduced due to the upward movement of the locking element, thus compressing the elastic element. Such a configuration is simple, easy to manufacture and assemble, ensures that the control unit is stably positioned in the receiving groove, and allows the user to easily operate the locking element.

[0016] Preferably, the locking element comprises an actuating part and a body part extending downwards from the actuating part and having a narrower width than the actuating part. Each of the receiving grooves comprises a relatively wider portion and a relatively narrower portion, which correspond in shape and position to the actuating part and the body part of the locking element, respectively. Each of the receiving grooves comprises several of the first stop elements listed above. The first stop elements comprise a first recess located on the relatively wider portion and a first projection located on the relatively narrower portion. Each of the locking elements comprises several of the second stop elements listed above. The second stop elements comprise a second projection located on the actuating part and a second recess located on the body part.

[0017] When the control unit is in the positioned state, the second projection and the second recess of the locking element, located on the actuating part and the body part, are each positioned at the first recess and the first projection of the receiving groove in which the locking element is located. This configuration ensures that the control unit is stably positioned in the receiving groove and that the entire barbell has a rigid structure.

[0018] In a further embodiment, each of the receiving grooves is provided on its inner wall with at least one first stop element. Each of the control units comprises a vertical rod, an elastic element, and a locking element. The vertical rod is attached to the crossbar. The locking element is slid onto the vertical rod. A limiting space is located between the locking element and the vertical rod. The elastic element is clamped in the limiting space. The locking element is provided on its outer surface with at least one second stop element. Each of the control assemblies is arranged in a positioned state in one of the receiving grooves and can be brought into a pressed state by the user pressing down on the locking element.When the control assembly is in the positioned state, the locking element is influenced by the elastic element such that the second stop part is positioned against the first stop part of the receiving groove in which the locking element is located. When the control unit is in the pressed state, the second stop part of the locking element disengages from the first stop part of the receiving groove in which the locking element is located, allowing the user to move the control unit and the crossbar attached to the vertical rod of the control unit along the horizontal axis.

[0019] As long as the user presses down on the locking mechanism of the control unit, they can move the control unit to adjust the weight of the weight plates by moving the connected crossbar. Once the user has moved the control unit to the desired position, they simply release the locking mechanism to securely fix the control unit in place. This configuration is quick and easy to use and makes the entire barbell structurally stable.

[0020] Preferably, the vertical rod remains stationary when the control unit is moved from the positioned state to the compressed state, and the confined space is reduced due to the downward movement of the locking element, thus compressing the elastic element. Such a configuration is simple, easy to manufacture and assemble, ensures that the control unit is stably positioned in the receiving groove, and allows the user to easily operate the locking element.

[0021] Preferably, the locking element comprises an actuating part and a body part extending downwards from the actuating part and having a narrower width than the actuating part. Each of the receiving grooves comprises a relatively wider portion and a relatively narrower portion, which correspond in shape and position to the actuating part and the body part of the locking element, respectively. Each of the receiving grooves comprises several of the first stop elements listed above. The first stop elements comprise a first hook section located on the relatively wider portion and a first hook hole located on the relatively narrower portion. Each of the locking elements comprises several of the second stop elements listed above. The second stop elements comprise a second hook hole located on the actuating part and a second hook section located on the body part.

[0022] When the control unit is in the positioned state, the second hook hole and the second hook section of the locking element, located on the operating section and the body section respectively, are positioned on the first hook section and the first hook hole of the receiving groove in which the locking element is located. This configuration positions the control unit stably in the receiving groove and gives the entire barbell a rigid structure.

[0023] Preferably, the two channels of the main body are located within the handle. This arrangement is particularly suitable for the two embodiments described above. By arranging the two channels within the handle, the crossbars for connecting the weight plates are located approximately in the center of the weight plates and the center of the weight-loading sections. This makes the entire assembly more stable and simplifies the process of providing the receiving grooves to the weight plates and weight-loading sections, enabling the arrangement of the control assemblies to be easy to use and exhibit good positioning accuracy.

[0024] Alternatively, in a further embodiment of the present invention, the main body comprises two tubes which are attached between the two weight-bearing sections, wherein the two channels are provided inside each of the two tubes.

[0025] Preferably, each of the tubes has an elongated hole extending along the horizontal axis, as well as a plurality of positioning holes opposite the elongated hole. Each of the crossbars has an installation hole perpendicular to the horizontal axis. The control unit of the adjusting device comprises two control units. The two control units are each inserted through the elongated holes of the two tubes and into the installation holes of the two crossbars. Each of the control units is movable by the user and can optionally be positioned in one of the positioning holes.

[0026] This allows the user to move the control unit along the elongated hole to move the associated crossbar, and to position the control unit in the positioning hole to position the crossbar and thus adjust the weight of the barbell's weight plates. Furthermore, the two control assemblies are located on the two tubes of the main body, meaning that both control assemblies are installed directly on the barbell, which is space-saving and convenient to use. The two channels are not located inside the handle, but rather in the two tubes that extend outside the handle. Therefore, although the control units are located directly in the channels and crossbars, they do not obstruct the user's movement when holding the barbell.In this way, the weight loading sections and weight plates do not need to be provided with grooves to accommodate the control units, making the overall configuration simple, easy to manufacture and assemble.

[0027] Preferably, each of the control assemblies comprises a locking element and an elastic element. The locking element includes a body part that is inserted into the elongated hole and the mounting hole, as well as an actuating element and a positioning element, each located at one of the two ends of the body part. The actuating element is located outside the tube so that the user can actuate the locking element. The elastic element is attached to the body part and clamped between the positioning element and the crossbar. Each of the control units is arranged in a positioned state in one of the positioning holes and can be moved into a withdrawn state by the user pulling the locking element out of the tube.When the control unit is in the positioned position, the positioning part of the locking element is influenced by the elastic element to become embedded in the positioning hole where the locking element is located. When the control unit is in the withdrawn position, the positioning part of the locking element leaves the positioning hole, allowing the user to move the control unit and the crossbar connected to it along the horizontal axis.

[0028] The user can therefore pull the locking element of the control unit out of the tube to move the connected crossbar and thus adjust the weight of the weight plates. Once the user has moved the control unit to the desired position, they simply need to align the locking element with the positioning opening at the desired position and release the locking element to securely position the control unit. This configuration is quick and easy to use and makes the entire barbell very stable.

[0029] In other embodiments of the present invention, the dumbbell structure further comprises a base for the main body and the two weight units to be placed on the base. The control unit of the adjustment device is arranged in the base. The control unit comprises a control element, a rotary element rotatable by the control element, and a linearly movable element that can be displaced along the horizontal axis by a drive from the rotary element. When the main body and the two weight units are arranged on the base, the linearly movable element is connected to the crossbar such that the crossbar, together with the linearly movable element, can be displaced along the horizontal axis.

[0030] This design places the control unit of the adjustment mechanism in the base, rather than in the main body or the two weight units, thus preventing the control unit from being located on the barbell itself. This prevents the user from being hindered during training and accidentally touching the control unit. With the main body and the two weight units positioned on the base, the user can use the control unit to operate the linearly moving element and drive the associated crossbar to adjust the weight plates of the barbell.

[0031] Preferably, each of the two weight-loading sections of the main body and the weight plates comprise a bottom surface and a receiving groove extending upwards from the bottom surface. The receiving groove and the through-hole of each weight-loading section are interconnected. The receiving groove and the connecting hole of each weight plate are interconnected. Each of the crossbars comprises a crossbar body and a vertical connecting element connected to one end of the crossbar body. The vertical connecting element is located in one of the receiving grooves, and the vertical connecting element is provided at its lower end with a first positioning part. The control unit comprises two of the linearly movable elements listed above.Each of the linearly movable elements comprises a vertical positioning rod, and each of the vertical positioning rods is provided with a second positioning part at its upper end. When the main body and the two weight units are placed on the base, the two vertical positioning rods are each inserted into the receiving grooves in which the two vertical connecting elements are located, and the second positioning parts of the two vertical positioning rods are each positioned with the first positioning parts of the two vertical connecting elements to make the two crossbars, along with the two linearly movable elements along the horizontal axis, interchangeable.

[0032] This allows the user to adjust the number of weight plates on the barbell simply by placing the main body and the two weight units onto the base and activating the control unit to move the two linearly movable elements, which in turn move the two crossbars. Once the user has moved the two crossbars to the desired position, they only need to release the control unit to lock the crossbars in place. Afterward, the user simply lifts the main body from the base to obtain the barbell with the required number of weight plates. This method of weight adjustment is very quick and easy.

[0033] Preferably, the rotary element is a gear. Each of the linearly movable elements comprises a rack. The racks of the two linearly movable elements are engaged with the gear in such a way that the racks can be displaced in opposite directions by the drive of the gear.

[0034] Therefore, the control element can be, for example, an electrically controlled motor or a manually operated knob to rotate the gear. The gear can drive the two linearly moving elements to move them simultaneously in opposite directions, and thus drive the two crossbars to move them simultaneously into the desired position. That is, the two crossbars are controlled simultaneously to connect the required number of weight plates. This type of weight adjustment is not only faster and easier, but it also ensures that the weight plates attached to both ends of the handlebars are the same, making it more convenient to use.

[0035] Preferably, the barbell assembly comprises two of the main bodies listed above and four of the weight units listed above. The adjustment device comprises four of the crossbars listed above and four of the vertical positioning bars listed above. Each of the main bodies is provided with two of the crossbars. Each of the linearly movable elements comprises a connecting plate attached to the support. Each of the connecting plates is connected to two of the vertical positioning bars.When the two main bodies and the four weight units are placed on the base, the four vertical positioning rods are each inserted into the receiving grooves in which the vertical connecting elements of the four crossbars are located, and the second positioning parts of the four vertical positioning rods are each positioned with the first positioning parts of the four vertical connecting elements, so that when the rotary link is turned, it drives the four crossbars to move simultaneously along the horizontal axis.

[0036] As a result, the dumbbell structure comprises two dumbbells that the user can operate with either hand. As long as the user operates the control mechanism to turn the gear, the gear drives the two linearly moving elements to move simultaneously in opposite directions, thus driving the four crossbars into the desired position. In other words, the four crossbars are controlled simultaneously to connect the required number of weight plates, ensuring that the weight plates installed at both ends of the dumbbell handles are adjusted at the same time. This method of weight adjustment is not only faster and easier but also guarantees that the weight plates attached to both ends of the dumbbell handles are identical, simplifying use.

[0037] The further scope of application of the present invention will become apparent from the detailed description below. However, it is clear that while the detailed description and specific examples represent preferred embodiments of the invention, they serve only for illustration, since various changes and modifications within the scope of the invention will be apparent to the person skilled in the art from this detailed description. BRIEF DESCRIPTION OF THE DRAWINGS Fig. Figure 1 is a composite perspective view of a weight-adjustable dumbbell structure according to a first preferred embodiment of the present invention. Fig. Figure 2 is a composite perspective view of a main body and an adjustment device of the dumbbell structure. Fig. Figure 3 is a sectional view along line 3-3 in Fig. 2. Fig. Figure 4 is a top view of a weight-bearing section of the main body. Fig. Figure 5 is an exploded view of two weight plates of the barbell structure. Fig. 6 resembles Fig. 2, however, shows the state after a control unit and a crossbar of the adjusting device have been moved. Fig. Figure 7 is a sectional view along line 7-7 in Fig. 2, which shows that the control unit is in a positioned state. Fig. 8 resembles Fig. However, 7 shows that the control unit is in a raised state. The Fig. 9-11 resemble Fig. 1 and show the process of operating the adjusting device. Fig. Figure 12 is a composite perspective view of a weight-adjustable dumbbell structure according to a second preferred embodiment of the present invention. Fig. Figure 13 is a composite perspective view of a main body and an adjustment device of the dumbbell structure. Fig. Figure 14 is an exploded view of two weight plates of the barbell structure. Fig. Figure 15 is a sectional view along line 15-15 in Fig. 13, which shows that a control unit of the adjusting device is in a positioned state. Fig. 16 resembles Fig. 15, however, shows that the control unit is in a pressed state. Fig. Figure 17 is a composite perspective view of a weight-adjustable dumbbell structure according to a third preferred embodiment of the present invention. Fig. Figure 18 is a composite perspective view of a main body and an adjustment device of the dumbbell structure. Fig. Figure 19 is a sectional view along line 19-19 in Fig. 18. Fig. Figure 20 is an exploded view of two weight plates of the barbell structure. Fig. 21 resembles Fig. Figure 19, however, shows the state after two control units and two crossbars of the adjusting device have been moved. Fig. 22 is an enlarged view of part of Fig. 19, which shows that the control unit is in a positioned state. Fig. 23 resembles Fig. 22, however, shows that the control unit is in a pulled-out state. Fig. Figure 24 is a composite perspective view of a weight-adjustable dumbbell structure according to a fourth preferred embodiment of the present invention. Fig. 25 is a sectional view along the line 25-25 in Fig. 24. Fig. Figure 26 is a composite perspective view of a base and a control unit of the dumbbell structure. Fig. 27 resembles Fig. 26, however, shows the state after a top cover and a bottom cover of the base have been removed. Fig. 28 is a front view of Fig. 27. Fig. 29 resembles Fig. 27, however, shows the state in which parts were removed to expose a rotating shaft. Fig. 30 is a top view of Fig. 29. Fig. Figure 31 is a composite perspective view of a main body and two crossbars of the barbell structure. Fig. Figure 32 is a sectional view along line 32-32 in Fig. 31. Fig. 33 resembles Fig. Figure 31, however, shows the state after the two crossbars have been moved. Fig. Figure 34 is an exploded view of two weight plates of the barbell structure. Fig. Figure 35 is a composite perspective view of part of one of the crossbars and a linearly movable element of the barbell structure. Fig. Figure 36 is an exploded view of a weight-adjustable dumbbell structure of a fifth preferred embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0038] It should first be noted that identical or similar reference numerals used in the following embodiments and the accompanying drawings denote identical or similar elements or their structural features throughout the entire description for the purpose of a concise presentation of the present invention. It should be noted that, for the sake of simplicity, the components and structures shown in the figures are not drawn to actual scale and size, and the features mentioned in each embodiment may be applied in the other embodiments where practical application is possible.When it is mentioned that one element is placed on top of another, this also means that the first-mentioned element is placed directly on top of the last-mentioned element, or that the first-mentioned element is placed indirectly on top of the last-mentioned element via one or more other elements between the first-mentioned and the last-mentioned element. When it is stated that one element is placed directly on top of another element, this means that no other element is placed between the first-mentioned and the last-mentioned element.

[0039] With reference to the Fig. 1 to Fig. 11 comprises a weight-adjustable dumbbell structure 11 according to a first preferred embodiment of the present invention comprising a base 20, a main body 30, two weight units, including a first weight unit 40A and a second weight unit 40B, and an adjustment device 50.

[0040] In appearance, the main body 30 comprises a handlebar 31 and two weight-loading sections, each attached to two ends of the handlebar 31, including a first weight-loading section 32A and a second weight-loading section 32B. The handlebar 31 is provided with two channels 33A, 33B, as shown in Fig. 3 shown, which run along a horizontal axis, i.e., the Y-axis in Fig. 1. The first and second weight-loading sections 32A, 32B each comprise a fixed surface 321 attached to the handlebar 31, a connecting surface 322 opposite the fixed surface 321, and a through-hole 323 penetrating the fixed surface 321 and the connecting surface 322, as shown in Fig. Figure 4 is shown. In this embodiment, the through-holes 323 of the first and second weight-loading sections 32A, 32B are both connected to the two channels 33A, 33B, but the present invention is not limited to this. The through-hole 323 of the first weight-loading section 32A only needs to be connected to channel 33A, and the through-hole 323 of the second weight-loading section 32B only needs to be connected to channel 33B.

[0041] As in Fig. 2 and Fig. As shown in Figure 4, each of the first and second weight-loading sections 32A, 32B comprises a combination recess 324 that is set back from the connecting surface 322. The connecting recess 324 comprises an upper section 324a, which is set back to a relatively smaller extent, and a lower section 324b, which is set back to a relatively larger extent. The lower section 324b extends from the lower edge of the upper section 324a to a bottom surface 325 of the weight-loading section. Furthermore, the first and second weight-loading sections 32A, 32B each have a receiving groove 61. The receiving groove 61 of the weight-loading section is located on the upper section 324a of the combination recess 324, extends downwards from a top surface 327 of the weight-loading section, and communicates with the through-hole 323.The receiving groove 61 comprises a relatively wider part 611 located on the upper surface 327 and a relatively narrower part 612 extending downwards from the relatively wider part 611 to the through-hole 323, which has a smaller width than the relatively wider part 611. The receiving groove 61 is provided on two opposing inner walls 613 with two first stop elements each. In this embodiment, the two first stop elements comprise a first recess 614, which is located as shown in . Fig. 6 shown, located on the relatively wider part 611, and a first projection 615, located on the relatively narrower part 612.

[0042] As in Fig. As shown in Figure 1, the first and second weight units 40A and 40B each comprise four weight plates 41, which are removably arranged one above the other. The weight plates 41, with the exception of the weight plates 41 furthest from the main body 30, are all arranged as shown in Figure 1. Fig. Figure 5 shows each of which has a first connecting surface 411, a second connecting surface 412 opposite the first connecting surface 411, and a connecting hole 413 that penetrates the first connecting surface 411 and the second connecting surface 412, and which also has a receiving groove 61 as described above. The weight plates 41 furthest from the main body 30 resemble those in Fig. The 5 weight plates 41 shown, however, each have a cover plate 415 which covers the connecting hole 413 and the receiving groove 61 on the second connecting surface 412.

[0043] The second connecting surface 412 of each of the weight plates 41 is shaped similarly to the connecting surface 322 of the weight-loading section described above. Each of the second connecting surfaces 412 has a recessed connecting recess 416. The connecting recess 416 comprises an upper section 416a, which is relatively deeply recessed, and a lower section 416b, which is recessed to a relatively greater extent. The lower section 416b extends from the lower edge of the upper section 416a to a bottom surface 417 of the weight plate 41. In contrast, each of the weight plates 41 has a combination section 418 that projects from the first combination surface 411 and is shaped complementarily to the upper section 416a of the combination recess 416. The combination recess 416 is suitable for embedding the combination section 418 in it in a downward sliding manner. That is to say, the in Fig. The five weight plates 41 shown are combined such that the underside 417 of the right weight plate 41 slides downwards from the top 419 of the left weight plate 41. In other words, the second combination surface 412 of the right weight plate 41 is combined with the first combination surface 411 of the left weight plate 41 in a downward sliding manner. When the weight plates 41 are separated, the second combination surface 412 of the right weight plate 41 separates from the first combination surface 411 of the left weight plate 41 in an upward sliding manner. The first and second weight loading sections 32A, 32B of the main body 30 are combined with the weight plates 41 in the same way.That is, the combination surfaces 322 of the first and second weight loading sections - loading sections 32A, 32B are connected to the first connecting surfaces 411 of the weight plates 41 in a downward sliding manner and separated from the first connecting surfaces 411 in an upward sliding manner.

[0044] The weight plates 41 and the first and second weight loading sections 32A, 32B all have the receiving grooves 61 of the same shape, and the connecting holes 413 of the weight plates 41 have the same shape as the through holes 323 of the first and second weight loading sections 32A, 32B. The receiving groove 61 of each of the weight plates 41 is located on the upper section 416a of the combination recess 416, extends downwards from the top 419 of the weight plate 41 and is connected to the connecting hole 413.

[0045] In the Fig. In the state shown in Figure 1, the main body 30 and the first and second weight units 40A and 40B are connected to each other and arranged on the base 20. The weight plates 41 of the first weight unit 40A are connected to each other in a stacked manner, as described above, with the connecting unit 416 embedding the connecting part 418 therein. The connecting part 418 of the first connecting surface 411 of one of the weight plates 41 of the first weight unit 40A is embedded in the connecting unit 324 of the connecting surface 322 of the first weight-loading section 32A. At this point, the connecting holes 413 of the weight plates 41 of the first weight unit 40A are connected to each other and are connected to the through hole 323 of the first weight-loading section 32A.Furthermore, the receiving grooves 61 of the weight plates 41 of the first weight unit 40A are interconnected and are connected to the receiving groove 61 of the first weight load section 32A. Likewise, the weight plates 41 of the second weight unit 40B are combined in a stacked manner, as described above, such that the combination recess 416 embeds the combination section 418 therein. The combination section 418 of the first combination surface 411 of one of the weight plates 41 of the second weight unit 40B is in the combination recess 324 of the connecting surface 322 of the second weight unit. At this point, the connecting holes 413 of the weight plates 41 of the second weight unit 40B are interconnected and are connected to the through-hole 323 of the second weight load section 32B.Furthermore, the receiving grooves 61 of the weight plates 41 of the second weight unit 40B are connected to each other and are connected to the receiving groove 61 of the second weight load section 32B.

[0046] As in Fig. 2 and Fig. As shown in Figure 3, the adjusting device 50 comprises two crossbars, including a first crossbar 51A and a second crossbar 51B, each inserted into the two channels 33A, 33B of the handlebar 31, and a control unit 52 that can control the first and second crossbars 51A, 51B so that they slide along the horizontal axis (Y-axis). In this embodiment, the control unit 52 comprises two control units 53 for controlling the first and second crossbars 51A, 51B.

[0047] Each of the control units 53 comprises a vertical rod 531, an elastic element 532, as shown in Fig. Figure 7 shows a locking element 533. The lower ends of the vertical rods 531 of the two control units 53 are each located at one end of the first crossbar 51A and one end of the second crossbar 51B at the positions corresponding to the through-holes 323 of the first and second weight-loading sections 32A, 32B of the main body 30. The locking element 533 is fitted onto the vertical rod 531. A limiting space 534 is located between the inner surface of the locking element 533 and the vertical rod 531. The elastic element 532 is pushed onto the vertical rod 531 and held in the limiting space 534. The locking element 533 comprises an actuating part 535 and a body part 536, which extends downwards from the actuating part 535 and is narrower than the actuating part 535. The actuating part 535 and the body part 536 correspond in shape and position to the relatively wider part 611 respectively.the relatively narrower part 612 of each of the receiving grooves 61. Furthermore, the locking element 533 is provided on its outer surface with two side walls 537 pointing in opposite directions. Each of the two side walls 537 is provided with two second stop parts. In this embodiment, the two second stop parts comprise a second projection 538 located on the actuating part 535 and a second recess 539 located on the body part 536.

[0048] In the Fig. 1 and Fig. In the state shown in Figure 2, the two control assemblies 53 are each positioned in the receiving grooves 61 of the first and second weight loading sections 32A, 32B of the main body 30 in a positioning state S1, as shown in Figure 2. Fig. 7 shown. Each of the control units 53 can be moved into a raised state S2, as shown in Fig. 8 and Fig. As shown in Figure 9, the locking element 533 can be moved by the user pulling it upwards. When the control unit 53 is in positioning state S1, the locking element 533 is influenced by the elastic element 532 such that its second stop parts are positioned against the first stop parts of the receiving groove 61 in which the locking element 533 is located. That is, the second projection 538 and the second recess 539 of the locking element 533 are each positioned against the first recess 614 and the first projection 615 of the receiving groove 61 in which the locking element 533 is located. At this point, both the control unit 53 and the crossbar attached to the vertical rod 531 of the control unit 53 are immobile.When the user pulls the locking element 533 upwards, the vertical rod 531 remains stationary, and the boundary space 534 decreases due to the upward movement of the locking element 533, thus compressing the elastic element 532. When the locking element 533 is pulled upwards to a certain height to bring the control unit 53 into the raised state S2, the second projection 538 and the second recess 539 of the locking element 533 are each separated from the first recess 614 and the first projection 615 of the receiving groove 61 in which the locking element 533 is located, thus breaking the positioning relationship between them.

[0049] Therefore, if the user brings the control unit 53, which is connected to the first crossbar 51A, into the raised state S2, the control unit 53 can move along the Y-axis to the receiving recess 61 of any of the weight plates 41 of the first weight unit 40A, so that the first crossbar 51A, together with the control unit 53, is moved to slide through the through-hole 323 of the first weight to the connecting hole 413 of the weight plate 41 on which the control unit 53 is located. For example, if the user wants to use all the weight plates 41 of the first weight unit 40A, the user moves the control unit 53 into the recess 61 of any of the weight plates 41 of the first weight unit 40A. Fig. The position shown in Figure 10 allows the first crossbar 51A to be inserted into the connecting holes 413 of all weight plates 41 of the first weight unit 40A. After selecting the weight plates 41 to be installed, the user only needs to release the locking element 533. The locking element 533 is moved downwards by the elastic restoring force of the elastic element 532, so that the control unit 53 returns to the positioning state S1. At this point, the control unit 53 is located in the receiving recess 61 of the weight plate 41, as shown in Figure 10. Fig. Figure 11 shows that, depending on the number of weight plates 41 the user wishes to use, the user can move the two control units 53 to their respective corresponding positions. These control units then move the first and second crossbars 51A and 51B, respectively, so that the first and second crossbars 51A and 51B connect the required number of weight plates 41. Once the adjustment is complete, the user simply lifts the handle 31 to obtain the barbell with the required number of weight plates 41. This type of weight adjustment is quick and easy and ensures a stable structure for the entire barbell.

[0050] The configuration of the connecting surfaces 322 of the first and second 32A, 32B of the main body 30 and the first and second connecting surfaces 411, 412 of the weight plates 41 ensures that the weight plates 41 connected by the crossbars are stably attached to the main body 30 and thus lifted when a portion of the weight plates 41 is not connected by the crossbars and the user lifts the handle 31 upwards, along with the main body 30. Meanwhile, the weight plates 41 not connected by the crossbars remain on the base 20 and are quickly and smoothly separated from the lifted weight plates 41. When the user has finished using the barbell or wishes to change the number of weight plates 41, they can easily recombine all weight plates 41 of the same weight unit by simply positioning the barbell on the unused weight plates 41 and setting the barbell down.Furthermore, the user can place the weight plates 41 and the barbell down during the process of combining one weight plate 41 with another weight plate 41, or combining weight plates 41 with the first weight plate 41. Additionally, the configuration, in which each of the connection recesses 324, 416 is provided with the lower section 324b, 416b, which is relatively deeply recessed, facilitates smooth assembly of two components, even if they are slightly inclined relative to each other.

[0051] With reference to Fig. 12 to Fig. 16 is a weight-adjustable dumbbell structure 12 according to a second preferred embodiment of the present invention similar to that in the first preferred embodiment, but the main difference between them lies in the two control assemblies 53 of the adjustment device 50 and the receiving recesses 61 which are provided on the first and second weight-loading sections 32A, 32B of the main body 30 and the weight plates 41 of the first and second weight units 40A, 40B to receive the two control assemblies 53.

[0052] The receiving groove 61 in this embodiment is approximately similar to the receiving groove 61 in the first preferred embodiment, but the main difference lies in the configurations of the two first stop parts on each inner wall 613 of the receiving groove 61. In this embodiment, the two first stop parts comprise a first hook section 616 located on the relatively wider part 611 of the receiving groove 61, and a first hook hole 617 located on the relatively narrower part 612 of the receiving groove 61.

[0053] The control device 53 in this embodiment is similar to the control device 53 in the first preferred embodiment and also comprises a vertical rod 531, an elastic element 532, and a locking element 533. The lower ends of the vertical rods 531 of both control devices 53 are each attached to one end of the first crossbar 51A and one end of the second crossbar 51B. The locking element 533 is attached to the vertical rod 531. A confined space 534 is located between the upper end of the vertical rod 531 and the locking element 533. The elastic element 532 is confined within the confined space 534.Furthermore, the locking element 533 also includes an actuating part 535 and a body part 536, which correspond in shape and position to the relatively wider part 611 and the relatively narrower part 612 of the receiving groove 61, but in this embodiment the two second stop parts on each side wall of the locking element 533 include a second hook hole 540 located on the actuating part 535 and a second hook section 541 located on the body part 536.

[0054] As in Fig. 15 and Fig. As shown in Figure 16, each of the control units 53 is positioned in a positioning state S1 in the receiving recess 61 of the weight-loading section of the main body 30 or in the receiving recess 61 of the weight plate 41 and can be moved into a pressed state S3 by the user pressing down the locking element 533. When the control unit 53 is in the positioning state S1, the locking element 533 is influenced by the elastic element 532 such that its second stop parts are positioned on the first stop parts of the receiving groove 61 in which the locking element 533 is located. That is, the second hook hole 540 and the second hook section 541 of the locking element 533 are located on the first hook section 616 and the first hook hole 617 of the receiving groove 61 in which the locking element 533 is located, respectively.At this point, both the control unit 53 and the crossbar attached to the vertical rod 531 of the control unit 53 are stationary. When the user pushes the locking element 533 downwards, the vertical rod 531 remains stationary, and the boundary space 534 decreases due to the downward movement of the locking element 533, thus compressing the elastic element 532. When the locking element 533 is pushed downwards to a certain depth to place the control unit 53 into the compressed state S3, the second hook hole 540 and the second hook section 541 of the locking element 533 are each separated from the first hook section 616 and the first hook hole 617 of the receiving groove 61 in which the locking element 533 is located, thus breaking the positioning relationship between them.

[0055] This embodiment can achieve similar effects to the first preferred embodiment, with the difference being that the adjusting device 50 in this embodiment is designed such that the user moves the control unit 53 and the crossbar attached to the vertical rod 531 of the control unit 53 along the horizontal axis (Y-axis) to adjust the number of weight plates 41 to be used. After completing the adjustment, the user simply needs to release the locking element 533. The locking element 533 is moved upwards by the elastic restoring force of the elastic element 532, so that the control unit 53 is repositioned in the receiving recess 61. This type of weight adjustment is quick and easy and gives the entire barbell a stable structure.

[0056] With reference to Fig. 17 to Fig. 23 is a weight-adjustable dumbbell structure 13 according to a third preferred embodiment of the present invention, similar to those in the first and second preferred embodiments described above, except that the main difference between them lies in the structure of the adjustment device and where it is arranged. The dumbbell structure 13 in this embodiment comprises a base 20, a main body 30, a first and a second weight unit 40A, 40B, and an adjustment device 50'.

[0057] The main body 30 comprises a handle 31, a first and a second weight-loading section 32A, 32B, each attached to two ends of the handle 31, two tubes 34 attached between the first and second weight-loading sections 32A, 32B, and two channels 33A, 33B, each located within the two tubes 34. Each of the channels 33A, 33B extends along a horizontal axis (Y-axis). The first and second weight-loading sections 32A, 32B each comprise a connecting surface 322 and two through-holes 323 that penetrate the connecting surface 322 and each communicate with the two channels 33A, 33B. However, the first weight-loading section 32A only needs to have the through-hole 323 that is connected to the channel 33A, and the second weight-loading section 32B only needs to have the through-hole 323 that is connected to the channel 33B.The first and second weight loading sections 32A, 32B each comprise a combination recess 324 which is set back from the combination surface 322.

[0058] The first and second weight units 40A and 40B each comprise five weight plates 41, which are removably stacked on top of each other. Each of the weight plates 41 comprises a first connecting surface 411, a second connecting surface 412 opposite the first connecting surface 411, and a connecting hole 413 that penetrates the first connecting surface 411 and the second connecting surface 412. There is a connecting part 418 that projects from the first connecting surface 411, and there is a connecting recess 416 that... The connecting recesses 416 of the second connecting surfaces 412 of the weight plates 41 and the connecting recesses 324 of the connecting surfaces 322 of the first and second weight load planes 32A, 32B have the same shape, all of which are able to embed the connecting section 418 of the first connecting surface 411 of the weight plate 41 in a downward sliding manner.32A and 32B have the same shape, so that all can embed the connecting section 418 of the first connecting surface 411 of the weight plate 41 in a downward sliding manner. In the in . Fig. In the state shown in Figure 17, the weight plates 41 of the first weight unit 40A are stacked and connected such that the connection recess 416 embeds the connection section 418 and one of the weight plates 41 is combined with the combination surface 322 of the first weight loading section 32A. At this point, the connection holes 413 of the weight plates 41 of the first weight unit 40A are connected to each other and are connected to the through hole 323 of the first weight loading section 32A. Likewise, the weight plates 41 of the second weight unit 40B are stacked and combined such that the combination recess 416 embeds the combination section 418 therein and one of the weight plates 41 is combined with the combination surface 322 of the second weight.At this point, the connecting holes 413 of the weight plates 41 of the second weight unit 40B are connected to each other and are connected to the through hole 323 of the second weight loading section 32B.

[0059] As in Fig. As shown in Figure 19, the adjusting device 50' comprises a first crossbar 51A and a second crossbar 51B, each inserted into the two channels 33A, 33B, and a control unit 52 that can displace the first and second crossbars 51A, 51B along the horizontal axis (Y-axis). The control unit 52 comprises two control units 55, each arranged in the two tubes 34.

[0060] Furthermore, each of the tubes 34 has an elongated hole 341 extending along the Y-axis and six positioning holes 342 opposite the elongated hole 341. The number of positioning holes 342 corresponds to the number of weight plates 41 in a weight unit, i.e., five, plus one weight-loading section, so their total is six. The function of the six positioning holes 342 is to attach an end piece 511 of the crossbar to the weight-loading section, as shown in Fig. 19, or to be positioned on one of the weight plates 41 of the associated weight unit. The first and second crossbars 51A, 51B each have an installation hole 512, as shown in Fig. Figure 22 shows the mounting hole 512 extending along the X-axis. The mounting hole 512 has a section 513 with a relatively larger radius and a section 514 with a relatively smaller radius, which are connected to each other, and a stepped section 515 located at their junction. The two control assemblies 55 are each inserted through the elongated holes 341 of the two tubes 34 and into the mounting holes 512 of the first and second crossbars 51A and 51B. Each of the control devices 55 can be moved by the user and optionally positioned in one of the positioning holes 342.

[0061] As in Fig. 22 and Fig. As shown in Figure 23, each of the control units 55 primarily comprises a locking element 551 and an elastic element 555. The locking element 551 includes a body part 552, an actuating part 553, and a positioning part 554, each located at one of the two ends of the body part 552. The elastic element 555 is slid onto the body part 552, and the body part 552 is inserted into the elongated hole 341 and the mounting hole 512 such that the actuating part 553 is located outside the tube 34 and corresponding to the elongated hole 341. The elastic element 555 is held between the positioning part 554 and the stepped section 515 of the mounting hole 512. Each of the control units 55 is located in one of the positioning holes 342 in a positioned state S1 and can be moved into a withdrawn state S4 by the user by pulling out the locking element 551 from the tube 34.When the control unit 55 is in positioning state S1, the positioning part 554 of the locking element 551 is influenced by the elastic element 555 to be inserted into the positioning hole 342 in which the locking element 551 is located. At this point, both the control unit 55 and the crossbar through which the control unit 55 is inserted are immobile. When the user pulls the locking element 551 out of the tube 34 to move the control unit 55 into the extended state S4, the positioning part 554 of the locking element 551 leaves the positioning hole 342 and retracts into the mounting hole 512 of the crossbar, thus compressing the elastic element 555.At this point, the positioning relationship between the control unit 55 and the tube 34 is broken, allowing the user to move the control unit 55 and the crossbar through which the control unit 55 is inserted along the Y-axis.

[0062] When the user connects the control unit 55 to the first crossbar 51A in the extended state S4, the user can move the control unit 55 along the Y-axis to the position corresponding to one of the positioning bores 342 of the tube 34 in which the control unit 55 is located, so that the first crossbar 51A moves together with the control unit 55 and can slide through the through-bore 323 of the first weight load section 32A into the connecting bore 413 of at least one of the weight plates 41 of the first weight unit 40A. After selecting the weight plates 41 to be installed, the user can move the control unit 55 to slide into the connecting bore 413 of at least one of the weight plates 41 of the first weight unit 40A. After selecting the weight plates 41 to be installed, the user only needs to release the locking element 551.The locking element 551 is influenced by the elastic restoring force of the elastic element 555 to move into the tube 34, so that the control unit 55 returns to the positioning state S1. At this point, the positioning part 554 of the locking element 551 is embedded in the positioning hole 342 in which the locking element 551 is located. In other words, depending on the number of weight plates 41 the user wants to use, the user can move the two control units 55 into their respective corresponding positions in order to move the first and second crossbars 51A, 51B with the two control units 55 so that the first and second crossbars 51A, 51B connect the required number of weight plates 41. For example, if the user wants to use all the weight plates 41 of the first and second weight units 40A, 40B, they move the two control assemblies 55 into the positions shown in the diagram. Fig. The 21 positions shown are positioned so that the first and second crossbars 51A, 51B are inserted into the connecting holes 413 of all weight plates 41 of the first and second weight units 40A, 40B, respectively. After completing the adjustment, the user only needs to lift the handle 31 to obtain the barbell with the required number of weight plates 41. This type of weight adjustment is quick and easy and makes the entire barbell stable.

[0063] With reference to Fig. 24 to Fig. 35 A weight-adjustable dumbbell structure 14 according to a fourth preferred embodiment of the present invention differs primarily from the embodiments described above in that in this embodiment the control unit is arranged in the base and several weight units can be controlled simultaneously by a single control element.

[0064] The barbell structure 14 in this embodiment comprises a base 20', two main bodies 30, two first weight units 40A, two second weight units 40B, and an adjustment device 70. The first and second weight units 40A and 40B each comprise nine weight plates 41, which are removable and arranged one above the other. Fig. As can be seen from Figure 24, the dumbbell structure 14 in this embodiment comprises two dumbbells, each dumbbell being a combination of a main body 30 and weight plates 41 of the associated first and second weight units 40A, 40B. The two main bodies 30 and the associated first and second weight units 40A, 40B are arranged together on the same base 20'. The adjusting device 70 arranged in the base 20' can adjust the weights of the weight plates 41 on both sides of the two dumbbells simultaneously. However, this embodiment can be configured to comprise only one dumbbell. That is, there can be only one main body 30, only one first weight unit 40A, and only one second weight unit 40B.

[0065] The base 20' comprises an upper cover 21, a lower cover 22, and a mounting plate 23 located between the upper cover 21 and the lower cover 22. The mounting plate 23 includes four sliding rails 231A, 231B, each located next to the four corners of the mounting plate 23. The upper cover 21 includes four receiving sections 211 for receiving the first and second weight units 40A, 40B, and four elongated holes 212A, 212B, each extending through the four receiving sections 211. The four elongated holes 212A, 212B are each arranged corresponding to the four sliding slots 231A, 231B of the mounting plate 23. The sliding slots 231A, 231B and the elongated holes 212A, 212B all extend along a horizontal axis (Y-axis).When this embodiment is configured to include only one dumbbell, the dumbbell structure has only two receiving sections 211, only one elongated hole 212A, only one elongated hole 212B, only one sliding rail 231A and only one sliding rail 231B.

[0066] The adjusting device 70 comprises a control unit 71, which is arranged in the base 20', and four crossbars. As shown in Fig. As shown in Figure 25, the four crossbars comprise a first crossbar 72A and a second crossbar 72B arranged in one of the main bodies 30, and another first crossbar 72A and another second crossbar 72B arranged in the other main body 30. If this embodiment is configured to comprise only one barbell, the barbell structure has only two crossbars.

[0067] The control unit 71 primarily comprises a control element 711, a rotary element 712 that can be rotated by the control element 711, and two linearly movable elements 713 that can be driven by the rotary element 712 to move along the horizontal axis (Y-axis). In this embodiment, the control element 711 is a motor. The motor is controlled by a control unit 73. The user can control the operation of the motor via an operating interface (not shown) that is electrically connected to the control unit 73. In this embodiment, the rotary element 712 is a gear. When rotating, the control element 711 drives the gear via a rotary shaft 74. Each of the linearly movable elements 713 comprises a rack 714, a connecting plate 715 attached to the rack 714, and two vertical positioning rods 716 arranged on the connecting plate 715.Therefore, the two linearly movable elements 713 have a total of four vertical positioning rods 716, each designed to control the four crossbars listed above. When this embodiment is configured to include only one barbell, each of the linearly movable elements 713 has only one vertical positioning rod 716, so that there are only two vertical positioning rods 716 in total.

[0068] Furthermore, the racks 714 of the two linearly movable elements 713 engage with two opposite sides of the gear, i.e., the rotating element 712. Therefore, when the gear rotates, it drives the racks 714 of the two linearly movable elements 713 to move in opposite directions. Fig. The connecting plate 715 of the left linearly movable element 713 bridges the two slide rails 231A, and the two vertical positioning rods 716 arranged thereon are each inserted through the two slide rails 231A to control the first cross rods 72A in the two main bodies 30. Fig. The connecting plate 715 of the right linearly movable element 713 bridges the two sliding slots 231B, and the two vertical positioning rods 716 arranged thereon are each inserted through the two sliding slots 231B to control the first cross rods 72B in the two main bodies 30. As shown in the Fig. 31 to Fig. As shown in Figure 34, the main bodies 30 and the weight plates 41 of the first and second weight units 40A, 40B in this embodiment are similar to those in the first and second preferred embodiment, but the main difference between them lies in the configurations of the receiving grooves of the weight loading sections and the weight plates.

[0069] The main body 30 comprises a handle 31, a first and a second weight-loading section 32A, 32B, each attached to two ends of the handle 31, and two channels 33A, 33B located within the handle 31. Each of the channels 33A, 33B extends along the horizontal axis (Y-axis). The first crossbar 72A and the second crossbar 72B are each arranged within the two channels 33A, 33B. The first and second crossbars 72A, 72B each comprise a crossbar body 721 and a vertical connecting piece 722, which is connected to one end of the crossbar body 721.

[0070] The first and second weight-loading sections 32A, 32B each comprise a connecting surface 322 and a through-hole 323 that penetrates the connecting surface 322 and connects to the two channels 33A, 33B. However, the through-hole 323 of the first weight-loading section 32A only needs to connect to channel 33A, and the through-hole 323 of the second weight-loading section 32B only needs to connect to channel 33B. The first and second weight-loading sections 32A, 32B each comprise a connecting recess 324 that is recessed from the connecting surfaces 322. Furthermore, the first and second weight-loading sections 32A, 32B each include a receiving recess 62 which extends upwards from the underside 325 of the weight-loading section and is connected to the through-hole 323.

[0071] Each of the weight plates 41 comprises a first connecting surface 411, a second connecting surface 412 opposite the first connecting surface 411, and a connecting hole 413 extending through both the first connecting surface 411 and the second connecting surface 412. A connecting section 418 is provided, projecting from the first connecting surface 411, and a connecting recess 416 is recessed from the second connecting surface 412. Furthermore, each of the weight plates 41 has a receiving groove 62 extending upward from the underside 417 of the weight plate and aligning with the connecting hole 413. The receiving grooves 62 of the weight plates 41 have the same shape as the receiving grooves 62 of the first and second weights.

[0072] The combination recesses 416 of the second combination surfaces 412 of the weight plates 41 and the combination recesses 324 of the combination surfaces 322 of the first and second weight loading sections 32A, 32B have the same shape, all of which are able to allow the combination section 418 of the first combination surface 411 of the weight plate 41 to slide downwards. In the Fig. 24 The weight plates 41 of the first weight unit 40A are stacked and combined such that the combination recess 416 embeds the combination section 418 therein, and one of the weight plates 41 is combined with the combination surface 322 of the first weight loading section 32A. At this point, the connecting holes 413 of the weight plates 41 of the first weight unit 40A communicate with each other and with the through hole 323 of the first weight loading section 32A, and the receiving grooves 62 of the weight plates 41 of the first weight unit 40A are connected to each other and to the receiving groove 62 of the first weight loading section 32A. Likewise, the weight plates 41 of the second weight unit 40B are stacked such that the connecting recess 416 embeds the connecting part 418 in it, and one of the weight plates 41 is connected to the connecting surface 322 of the second weight loading part 32B.At this point, the connecting holes 413 of the weight plates 41 of the second weight unit 40B are connected to each other and are connected to the through hole 323 of the second weight loading section 32B, and the receiving grooves 62 of the weight plates 41 of the first weight unit 40B are connected to each other and are connected to the receiving groove 62 of the second weight loading section 32B.

[0073] As in Fig. As shown in Figure 35, the vertical connecting element 722 of each of the crossbars is provided at its lower end with a first positioning part 723, and each of the vertical positioning bars 716 of the control unit 71 is provided at its upper end with a second positioning part 717. The first positioning part 723 and the second positioning part 717 can be connected or disconnected from each other by moving them relative to each other along a vertical axis (Z-axis). When connected, as shown in Figure 35, the vertical connecting element 722 of each of the crossbars is provided with a first positioning part 723, and each of the vertical positioning bars 716 of the control unit 71 is provided at its upper end with a second positioning part 717. The first positioning part 723 and the second positioning part 717 can be connected or disconnected from each other by moving them relative to each other along a vertical axis (Z-axis). Fig. As shown in Figure 35, the first positioning part 723 and the second positioning part 717 are positioned relative to each other on the Y-axis, which means that they cannot be separated from each other by moving them relative to each other along the Y-axis.

[0074] If the first and second crossbars 72A, 72B in each of the main bodies 30 are both not extended, as in Fig. As shown in Figure 31, the vertical connecting elements 722 of the crossbars are located in the receiving grooves 62 of the first and second weight-loading sections 32A, 32B, and the control unit 71 is located accordingly in the Fig. 29 and Fig. 30 shown in the state. When, at this point, the main bodies 30 and the first and second weight units 40A, 40B are all placed on the base 20', the vertical positioning rods 716 are each inserted into the receiving grooves 62 in which the vertical connecting elements 722 of the first and second crossbars 72A, 72B are located, and the second positioning parts 717 of the vertical positioning rods 716 are each positioned with the first positioning parts 723 of the vertical connecting pieces 722. At this point, as soon as the user controls the motor (i.e., the control element 711) to rotate the gear (i.e., the rotary element 712), the gear drives all vertical positioning rods 716 to move together along the Y-axis. The two left vertical positioning rods 716 in Fig. The 30 move in the direction of the negative Y-axis and each drives the first crossbars 72A in the two main bodies 30 to move in the direction of the negative Y-axis. Meanwhile, the two right vertical positioning rods 716 move in Fig. 30 in the direction of the positive Y-axis and each drive the second crossbars 72B in the two main bodies 30 to move in the direction of the positive Y-axis. As a result, the first and second crossbars 72A, 72B are simultaneously controlled by the control unit 71 so that they each protrude through the through holes 323 of the first and second weight loading sections 32A, 32B, in order to slide to the connecting holes 413 of the weight plates 41 of the first and second weight units 40A, 40B.

[0075] In other words, the user can operate the control unit 71 according to the number of weight plates 41 they wish to use, moving the first and second crossbars 72A, 72B into the corresponding positions to connect the required number of weight plates 41. Once the adjustment is complete, the user simply lifts the handle 31 to obtain the barbell with the required number of weight plates 41. This type of weight adjustment is quick and easy and allows for the simultaneous adjustment of the weight plates 41 on both sides of the same barbell, and even the simultaneous adjustment of two barbells. Furthermore, this type of weight adjustment ensures that the number of weight plates 41 is the same on both sides of each barbell, simplifying its use.

[0076] With reference to Fig. 36 is a weight-adjustable dumbbell structure 15 according to a fifth preferred embodiment of the present invention, similar to that in the fourth preferred embodiment, but the main difference between them is that the control element 711 in this embodiment is a knob with which the user can manually turn the control element 711 to adjust the rotary element 712 as in Fig. 29 shown to turn and thus adjust the weights of the weight plates 41 on both sides of the handles 31 of the dumbbells.

[0077] The description of the invention indicates that it can be varied in many ways. Such variations are not to be considered as deviations from the scope of the invention, and all modifications that are obvious to a person skilled in the art are to be included in the scope of the following claims.

[0078] An adjustable weight barbell structure comprises a main body, two weight units, and an adjustment mechanism. The main body includes a handle, two weight-loading sections, and two channels. Each weight-loading section has a through-hole that connects to the channel. The two weight units are each detachably connected to the two weight-loading sections and each comprises multiple weight plates that are detachably stacked on top of each other, each with a connecting hole. The adjustment mechanism comprises a control unit and two crossbars, each slidably inserted into the two channels. The control unit can guide the crossbars to slide selectively through the through-holes of the two weight-loading sections and into the connecting holes of at least one of the weight plates of the two weight units.The present invention thus enables quick and easy weight adjustment by adding or removing weight plates.

Claims

[1] Weight-adjustable dumbbell structure (11, 12, 13, 14, 15), characterized by is that it includes: a main body (30) with a handle (31), two weight-loading sections (32A, 32B) each attached to two ends of the handle (31), and two channels (33A, 33B) extending along a horizontal axis, each of the weight-loading sections (32A, 32B) having a connecting surface (322) and a through-hole (323) penetrating the connecting surface (322), the two channels (33A, 33B) each being connected to the through-holes (323) of the two weight-loading sections (32A, 32B); two weight units (40A, 40B), each of the weight units (40A, 40B) comprising several weight plates (41) which are detachably stacked and combined, each of the weight plates (41) comprising a first connecting surface (411), a second connecting surface (412) facing away from the first connecting surface (411), and a connecting hole (413) which penetrates the first connecting surface (411) and the second connecting surface (412); and an adjusting device (50, 50', 70) comprising a control unit (52, 71) and two crossbars (51A, 51B, 72A, 72B), wherein the two crossbars (51A, 51B, 72A, 72B) are each inserted into the two channels (33A, 33B) so that the two crossbars (51A, 51B, 72A, 72B) can be controlled by the control unit (52, 71) to slide along the horizontal axis; wherein the two weight-loading sections (32A, 32B) of the main body (30) comprise a first weight-loading section (32A) and a second weight-loading section (32B); the two weight units (40A, 40B) comprise a first weight unit (40A) and a second weight unit (40B); one of the weight plates (41) of the first weight unit (40A) is detachably connected to the connecting surface (322) of the first weight-loading section (32A), and the connecting holes (413) of the weight plates (41) of the first weight unit (40A) are interconnected and are connected to the through hole (323) of the first weight-loading section (32A); wherein one of the weight plates (41) of the second weight unit (40B) is detachably connected to the connecting surface (322) of the second weight load section (32B), and the connecting holes (413) of the weight plates (41) of the second weight unit (40B) are connected to each other and to the through hole (323) of the second weight load section (32B); wherein the two crossbars (51A, 51B, 72A, 72B) of the adjusting device (50, 50', 70) comprise a first crossbar (51A, 72A) and a second crossbar (51B, 72B); wherein the first crossbar (51A, 72A) can be controlled by the control unit (52, 71) to optionally pass through the through hole (323) of the first weight loading section (32A) to slide to the connecting hole (413) of at least one of the weight plates (41) of the first weight unit (40A); wherein the second crossbar (51B, 72B) can be controlled by the control unit (52, 71) so that it optionally extends through the through hole (323) of the second weight load section (32B) to slide to the connecting hole (413) of at least one of the weight plates (41) of the second weight unit (40B). [2] Weight-adjustable dumbbell structure (11, 12, 13, 14, 15) according to claim 1, characterized by, that the combination surface (322) of the weight-loading section of the main body (30) is combined with the first combination surface (411) of the weight plate (41) in a downward sliding manner and is separated from the first connecting surface (411) in an upward sliding manner; that for each pair of adjacent weight plates (41), the second connecting surface (412) of one of the weight plates (41) is connected to the first connecting surface (411) of the other of the weight plates (41) in a downward sliding manner and is separated from the first connecting surface (411) in an upward sliding manner. [3] Weight-adjustable dumbbell structure (11, 12, 13, 14, 15) according to claim 2, characterized by, that each of the weight plates (41) has a connecting section (418) that projects from the first connecting surface (411); that each of the weight loading sections (32A, 32B) and the weight plates (41) have a connecting recess (324, 416); that the connecting recess (324) of the weight loading section (32A, 32B) is recessed relative to the connecting surface (322); that the combination recess (416) of the weight plate (41) is recessed relative to the second combination surface (412); that the combination recess (324, 416) is designed such that the combination section (418) can be embedded therein in a downward sliding manner. [4] Weight-adjustable dumbbell structure (11, 12) according to claim 3, characterized by, that each of the combination recesses (324, 416) has an upper section (324a, 416a) that is relatively less deeply recessed and a lower section (324b, 416b) that is relatively more deeply recessed; that the lower section (324b) of the combination recess (324) of the weight-loading section (32A, 32B) extends from a lower edge of the upper section (324a) of the combination recess (324) of the weight-loading section (32A, 32B) to a lower surface (325) of the weight-loading section (32A, 32B); that the lower section (416b) of the combination recess (416) of the weight plate (41) extends from a lower edge of the upper section (416a) of the combination recess (416) of the weight plate (41) to a lower surface (417) of the weight plate (41). [5] Weight-adjustable dumbbell structure (11, 12) according to claim 1, characterized by, that each of the two weight-loading sections (32A, 32B) of the main body (30) and the weight plates (41) has a top (327, 419) and a receiving recess (61) extending downwards from the top (327, 419); that the receiving recess (61) and the through-hole (323) of each of the weight receiving parts (32A, 32B) are interconnected; that the receiving recess (61) and the connecting bore (413) of each of the weight plates (41) are interconnected; that the control unit (52) of the adjusting device (50) comprises two control units (53), each connected to one end of the first crossbar (51A) and one end of the second crossbar (51B); that the two control units (53) are each housed in the receiving grooves (61) of the two weight loading sections (32A, 32B) of the main body (30) and can be moved by a user to the receiving grooves (61) of the two weight units (40A, 40B). [6] Weight-adjustable dumbbell structure (11) according to claim 5, characterized bythat each of the receiving grooves (61) is provided on its inner wall (613) with at least one first stop element; that each of the control assemblies (53) comprises a vertical rod (531), an elastic element (532) and a locking element (533); that the vertical rod (531) is attached to the crossbar (51A, 51B); that the locking element (533) is fitted onto the vertical rod (531); that a limiting space (534) is provided between the locking element (533) and the vertical rod (531); that the elastic element (532) is restricted in the limiting space (534); that the locking element (533) is provided on its outer surface with at least one second stop element; that each of the control units (53) is arranged in a positioned state (S1) in one of the receiving grooves (61) and can be brought into a raised state (S2) by the user by pulling up the locking element (533);that when the control unit (53) is in the positioning state (S1), the locking element (533) is influenced by the elastic element (532) such that the second stop part is positioned on the first stop part of the receiving groove (61) in which the locking element (533) is located; that when the control unit (53) is in the raised state (S2), the second stop part of the locking element (533) leaves the first stop part of the receiving groove (61) in which the locking element (533) is located, so that the control unit (53) and the crossbar (51A, 51B) which is attached to the vertical bar (531) of the control unit (53) can be moved by the user along the horizontal axis. [7] Weight-adjustable dumbbell structure (11) according to claim 6, characterized by, that when the control unit (53) is moved from the positioning state (S1) to the raised state (S2), the vertical rod (531) remains stationary and the boundary space (534) is reduced due to the upward movement of the locking element (533), so that the elastic element (532) is compressed. [8] Weight-adjustable dumbbell construction (11) according to claim 6, characterized bythat the locking element (533) comprises an actuating part (535) and a body part (536) extending downwards from the actuating part (535) and having a narrower width than the actuating part (535); that each of the receiving grooves (61) comprises a relatively wider part (611) and a relatively narrower part (612) which correspond in shape and position to the actuating part (535) and the body part (536) of the locking element (533); that each of the receiving grooves (61) comprises several of the first stop parts; that the first stop parts comprise a first recess (614) arranged on the relatively wider part (611) and a first projection (615) arranged on the relatively narrower part (612); that each of the locking elements (533) comprises several second stop parts;that the second stop parts comprise a second projection (538) arranged on the actuating part (535) and a second recess (539) arranged on the body part (536). [9] Weight-adjustable dumbbell structure (12) according to claim 5, characterized bythat each of the receiving grooves (61) is provided on its inner wall (613) with at least one first stop element; that each of the control units (53) comprises a vertical rod (531), an elastic element (532) and a locking element (533); that the vertical rod (531) is attached to the crossbar (51A, 51B); that the locking element (533) is fitted onto the vertical rod (531); that a limiting space (534) is provided between the locking element (533) and the vertical rod (531); that the elastic element (532) is restricted in the limiting space (534); that the locking element (533) is provided on its outer surface with at least one second stop element; that each of the control units (53) is positioned in a positioning state (S1) in one of the receiving grooves (61) and can be brought into a pressure state (S3) by the user by pressing down the locking element (533);that when the control unit (53) is in the positioning state (S1), the locking element (533) is influenced by the elastic element (532) such that the second stop part is positioned on the first stop part of the receiving groove (61) in which the locking element (533) is located; that when the control unit (53) is in the pressed state (S3), the second stop part of the locking element (533) leaves the first stop part of the receiving groove (61) in which the locking element (533) is located, so that the control unit (53) and the crossbar (51A, 51B) which is attached to the vertical bar (531) of the control unit (53) can be moved by the user along the horizontal axis. [10] Weight-adjustable dumbbell construction (12) according to claim 9, characterized by, that when the control unit (53) is moved from the positioned state (S1) to the pressed state (S3), the vertical rod (531) remains stationary and the boundary space (534) is moved downwards due to the downward movement of the locking element (533), so that the elastic element (532) is compressed. [11] Weight-adjustable dumbbell structure (12) according to claim 9, characterized bythat the locking element (533) comprises an actuating part (535) and a body part (536) extending downwards from the actuating part (535) and having a narrower width than the actuating part (535); that each of the receiving grooves (61) comprises a relatively wider part (611) and a relatively narrower part (612) which correspond in shape and position to the actuating part (535) and the body part (536) of the locking element (533); that each of the receiving grooves (61) comprises several of the first stop parts; that the first stop parts comprise a first hook section (616) provided on the relatively wider part (611) and a first hook hole (617) provided on the relatively narrower part (612); that each of the locking elements (533) comprises several second stop parts;that the second stop parts comprise a second hook hole (540) provided on the actuating part (535) and a second hook section (541) provided on the body part (536). [12] Weight-adjustable dumbbell structure (11, 12, 14, 15) according to claim 1, characterized by , that the two channels (33A, 33B) of the main body (30) are located in the handle (31). [13] Weight-adjustable dumbbell structure (13) according to claim 1, characterized by , that the main body (30) further comprises two tubes (34) which are attached between the two weight-loading sections (32A, 32B); wherein the two channels (33A, 33B) are each located in the two tubes (34). [14] Weight-adjustable dumbbell structure (13) according to claim 13, characterized by, that each of the tubes (34) has an elongated hole (341) extending along the horizontal axis, as well as several positioning holes (342) opposite the elongated hole (341); that each of the crossbars (51A, 51B) has a mounting hole (512) perpendicular to the horizontal axis; that the control unit (52) of the adjusting device (50') comprises two control units (55); that the two control units (55) are each inserted through the elongated holes (341) of the two tubes (34) and each into the mounting holes (512) of the two crossbars (51A, 51B); that each of the control units (55) is movable by the user and can be selectively positioned in one of the positioning holes (342). [15] Weight-adjustable dumbbell construction (13) according to claim 14, characterized by, that each of the control units (55) comprises a locking element (551) and an elastic element (555); that the locking element (551) comprises a body part (552) which is inserted into the elongated hole (341) and the mounting hole (512), as well as an actuating part (553) and a positioning part (554), each provided at two ends of the body part (552); that the actuating part (553) is provided outside the tube (34) so ​​that the user can actuate the locking element (551); that the elastic element (555) is attached to the body part (552) and clamped between the positioning part (554) and the crossbar (51A, 51B); that each of the control units (55) is provided in a positioning hole (342) in a positioned state (S1) and can be pulled out of the tube (34) by the user by pulling the locking element (551);that when the control unit (55) is in the positioning state (S1), the positioning part (554) of the locking element (551) is influenced by the elastic element (555) to be embedded in the positioning hole (342) in which the locking element (551) is provided; that when the control unit (55) is in the extended state (S4), the positioning part (554) of the locking element (551) leaves the positioning hole (342), so that the control unit (55) and the crossbar (51A, 51B) connected to the control unit (55) can be moved by the user along the horizontal axis. [16] Weight-adjustable dumbbell construction (14, 15) according to claim 1, characterized by, that the weight-adjustable barbell construction (14, 15) further comprises a base (20') for the main body (30) and the two weight units (40A, 40B) which are to be arranged on the base (20'); that the control unit (71) of the adjusting device (70) is arranged in the base (20'); that the control unit (71) comprises a control element (711), a rotary element (712) rotatable by the control element (711) and a linearly movable element (713) which is displaceable along the horizontal axis by being driven by the rotary element (712); that when the main body (30) and the two weight units (40A, 40B) are arranged on the base (20'), the linearly movable element (713) is connected to the crossbar (72A, 72B) such that the crossbar (72A, 72B) together with the linearly movable element (713) is displaceable along the horizontal axis. [17] Weight-adjustable dumbbell construction (14, 15) according to claim 16, characterized by, that each of the two weight-loading sections (32A, 32B) of the main body (30) and the weight plates (41) have a bottom surface (325) and a receiving groove (62) extending upwards from the bottom surface (325); that the receiving groove (62) and the through-hole (323) of each of the weight-loading sections (32A, 32B) are interconnected; that the receiving groove (62) and the connecting hole (413) of each of the weight plates (41) are interconnected; that each of the crossbars (72A, 72B) comprises a crossbar body (721) and a vertical connecting element (722) connected to one end of the crossbar body (721); that the vertical connecting element (722) is provided in one of the receiving grooves (62), and the vertical connecting element (722) is provided at its lower end with a first positioning part (723); that the control unit (71) comprises two of the linear motion parts (713);that each of the linearly movable elements (713) comprises a vertical positioning rod (716), and each of the vertical positioning rods (716) is provided at its upper end with a second positioning part (717); that when the main body (30) and the two weight units (40A, 40B) are arranged on the base (20'), the two vertical positioning rods (716) are each inserted into the receiving grooves (62) in which the two vertical connecting elements (722) are provided, and the second positioning parts (717) of the two vertical positioning rods (716) are arranged with the first positioning parts (723) of the two vertical connecting elements (722) to make the two crossbars (72A, 72B) together with the two linearly movable elements (713) interchangeable along the horizontal axis. [18] Weight-adjustable dumbbell structure (14, 15) according to claim 17, characterized by, that the rotating element (712) is a gear; that each of the linearly movable elements (713) comprises a rack (714); that the racks (714) of the two linearly movable elements (713) engage with the gear, so that the racks (714) can be interchanged by driving the gear in opposite directions. [19] Weight-adjustable dumbbell structure (14, 15) according to claim 18, characterized by, that the weight-adjustable barbell structure (14, 15) comprises two of the main bodies (30) and four of the weight units (40A, 40B), and the adjusting device (70) comprises four of the crossbars (72A, 72B) and four of the vertical positioning bars (716); that each main body (30) is provided therein with two of the crossbars (72A, 72B); that each of the linearly moving elements (713) comprises a connecting plate (715) which is attached to the rack (714); that each of the connecting plates (715) is connected to two of the vertical positioning bars (716);that when the two main bodies (30) and the four weight units (40A, 40B) are arranged on the base (20'), the four vertical positioning rods (716) are each inserted into the receiving grooves (62) in which the vertical connecting elements (722) of the four cross rods (72A, 72B) are provided, and the second positioning parts (717) of the four vertical positioning rods (716) are each arranged with the first positioning parts (723) of the four vertical connecting pieces (722), so that when the rotating element (712) rotates, it drives the four cross rods (72A, 72B) to move simultaneously along the horizontal axis.

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