WEIGHT ADJUSTABLE DUMBBELL STRUCTURE AND WEIGHT ADJUSTING METHOD THEREOF

BACKGROUND OF THE INVENTION

1. Field of the Invention

[0001]The present invention relates to dumbbells for fitness activities such as weight training and more particularly, to a weight adjustable dumbbell structure and a weight adjusting method thereof.

2. Description of the Related Art

[0002]Dumbbells are exercise equipment commonly used by the general public today. Traditional dumbbells are monolithically formed, and cannot be adjusted in weight. Training with varying levels of resistance requires a dumbbell set containing multiple dumbbells of different weights. Some dumbbells allow the users to adjust the overall weight by movably adding or removing weight plates at both ends of the handlebar.

[0003]Specifically speaking, for the conventional dumbbells adjustable in weight by the users adding or removing weight plates, the combination of a handlebar with weight plates is achieved typically by inserting two locking rods through a required number of weight plates and then tightly screwing the locking rods at both ends of the handlebar. However, when adjusting the weight, the user has to unscrew the locking rod from the handlebar, remove or add weight plates, and then tightly screw the locking rods to the handlebar again. This adjusting manner is inconvenient and thereby needs improvement.

SUMMARY OF THE INVENTION

[0004]The present invention has been accomplished in view of the above-noted circumstances. It is a primary objective of the present invention to provide a weight adjustable dumbbell structure and a weight adjusting method thereof, which allow for quick and simple weight adjustments by adding or removing weight plates.

[0005]To attain the above objective, the present invention provides a weight adjustable dumbbell structure which includes a main body, two weight units, and an adjusting device. The main body includes a handlebar, two weight-loading portions fixed to two ends of the handlebar respectively, and two channels extending along a horizontal axis. Each of the weight-loading portions includes a combining surface, and a through hole penetrating through the combining surface. The two channels communicate with the through holes of the two weight-loading portions respectively. Each of the weight units includes a plurality of weight plates detachably combined in a stacked manner. Each of the weight plates includes a first combining surface, a second combining surface opposite to the first combining surface, and a connecting hole penetrating through the first combining surface and the second combining surface. The adjusting device includes a control unit, and two transverse rods. The two transverse rods are inserted in the two channels respectively in a way that the two transverse rods are controllable by the control unit to slide along the horizontal axis. The two weight-loading portions of the main body include a first weight-loading portion, and a second weight-loading portion. The two weight units include a first weight unit, and a second weight unit. One of the weight plates of the first weight unit is detachably combined to the combining surface of the first weight-loading portion, and the connecting holes of the weight plates of the first weight unit communicate with each other and communicate with the through hole of the first weight-loading portion. One of the weight plates of the second weight unit is detachably combined to the combining surface of the second weight-loading portion, and the connecting holes of the weight plates of the second weight unit communicate with each other and communicate with the through hole of the second weight-loading portion. The two transverse rods of the adjusting device include a first transverse rod, and a second transverse rod. The first transverse rod is controllable by the control unit to optionally penetrate through the through hole of the first weight-loading portion so as to slide to the connecting hole of at least one of the weight plates of the first weight unit. The second transverse rod is controllable by the control unit to optionally penetrate through the through hole of the second weight-loading portion so as to slide to the connecting hole of at least one of the weight plates of the second weight unit.

[0010]It can be known from the above description that the present invention uses the two transverse rods stretched out from the weight-loading portions at two ends of the handlebar to connect the weight plates, and adapted for the user to operate the control unit to adjust the amount of the weight plates connected by each of the transverse rods. Therefore, the user only has to operate the control unit by a simple action and then lift the handlebar upwardly to obtain the dumbbell installed with the required number of weight plates. Such weight adjusting manner is very fast and easy.

[0011]Preferably, the combining surface of the weight-loading portion of the main body is combined with the first combining surface of the weight plate in a downward sliding manner, and separated from the first combining surface in an upward sliding manner. For every two adjacent weight plates, the second combining surface of one of the weight plates is combined with the first combining surface of the other of the weight plates in a downward sliding manner, and separated from the first combining surface in an upward sliding manner.

[0012]As a result, when the weight plates are all not connected by the transverse rods, they can be still combined with each other through their first and second combining surfaces, and can be combined to the combining surfaces of the weight-loading portions of the main body. When a part of the weight plates are connected by the transverse rods and the user lifts the main body upwardly, the weight plates connected by the transverse rods are stably fixed to the main body and thereby lifted along with the main body, meanwhile quickly and smoothly separated from the weight plates not connected by the transverse rods. When the user finishes using the dumbbell or wants to change the amount of the weight plates of the dumbbell, the user can easily combine all the weight plates of the same weight unit again by only positionally aiming the dumbbell at the unused weight plates and putting down the dumbbell.

[0013]More preferably, each of the weight plates includes a combining portion protruding from the first combining surface. Each of the weight-loading portions and the weight plates includes a combining recess. The combining recess of the weight-loading portion is recessed from the combining surface. The combining recess of the weight plate is recessed from the second combining surface. The combining recess is suitable to embed the combining portion therein in a downward sliding manner. As a result, the combinations of the protruding combining portions with the recessed combining recesses make the combinations between the weight plates and the combinations between the weight plates and the weight-loading portions more accurate and firmer.

[0014]More preferably, each of the combining recesses includes an upper section recessed to a relatively lower extent, and a lower section recessed to a relatively higher extent. The lower section of the combining recess of the weight-loading portion extends from a lower edge of the upper section of the combining recess of the weight-loading portion to a bottom side of the weight-loading portion. The lower section of the combining recess of the weight plate extends from a lower edge of the upper section of the combining recess of the weight plate to a bottom side of the weight plate.

[0015]As a result, in the process of combining a weight plate with another weight plate or combining a weight plate with a weight-loading portion, the configuration design of the combining recess facilitates smooth assembly of two components even if they are slightly inclined relative to each other.

[0016]In some embodiments of the present invention, each of the two weight-loading portions of the main body and the weight plates includes a top side, and an accommodating groove extending downwardly from the top side. The accommodating groove and the through hole of each of the weight-loading portions communicate with each other. The accommodating groove and the connecting hole of each of the weight plates communicate with each other. The control unit of the adjusting device includes two control assemblies connected to an end of the first transverse rod and an end of the second transverse rod respectively. The two control assemblies are accommodated in the accommodating grooves of the two weight-loading portions of the main body respectively, and movable by a user to the accommodating grooves of the two weight units.

[0017]As a result, the user can move each of the control assemblies to move the transverse rod connected therewith, so as to adjust the amount of the weight plates of the dumbbell. Besides, the two control assemblies are accommodated in the accommodating grooves of the two weight-loading portions of the main body or the accommodating grooves of the two weight units, so the two control assemblies are installed on the dumbbell, that is space-saving and convenient for operation.

[0018]In one of the embodiments, each of the accommodating grooves is provided on an inner wall thereof with at least one first stopping part. Each of the control assemblies includes a vertical rod, an elastic member, and a locking member. The vertical rod is fixed to the transverse rod. The locking member is sleeved onto the vertical rod. There is a limiting space between the locking member and the vertical rod. The elastic member is constrained in the limiting space. The locking member is provided on an outer surface thereof with at least one second stopping part. Each of the control assemblies is positioned in one of the accommodating grooves in a positioned status, and changeable into a pulled-up status by the user pulling the locking member upwardly. When the control assembly is in the positioned status, the locking member is affected by the elastic member so that the second stopping part is positioned at the first stopping part of the accommodating groove which the locking member is located in. When the control assembly is in the pulled-up status, the second stopping part of the locking member leaves the first stopping part of the accommodating groove which the locking member is located in, so that the control assembly and the transverse rod fixed to the vertical rod of the control assembly are movable along the horizontal axis by the user.

[0019]As a result, as long as the user pulls the locking member of the control assembly upwardly, the user can move the control assembly to move the transverse rod connected therewith, so as to adjust the amount of the weight plates of the dumbbell. When the user moves the control assembly to the desired position, the user only has to let go of the locking member to position the control assembly at the desired position stably. Such configuration is fast and easy in use, and makes the entire dumbbell firm in structure.

[0020]Preferably, when the control assembly is changed from the positioned status into the pulled-up status, the vertical rod remains stationary, and the limiting space is reduced due to the upward movement of the locking member, so that the elastic member is compressed. Such configuration design is simple, easy to manufacture and assemble, makes the control assembly positioned in the accommodating groove stably, and allows the user to operate the locking member easily.

[0021]Preferably, the locking member includes an operating part, and a body part extending downwardly from the operating part and smaller in width than the operating part. Each of the accommodating grooves includes a relatively wider part and a relatively narrower part, which correspond in shape and position to the operating part and the body part of the locking member respectively. Each of the accommodating grooves includes a plurality of the aforementioned first stopping parts. The first stopping parts include a first recess located at the relatively wider part, and a first protrusion located at the relatively narrower part. Each of the locking members includes a plurality of the aforementioned second stopping parts. The second stopping parts include a second protrusion located at the operating part, and a second recess located at the body part.

[0022]As a result, when the control assembly is in the positioned status, the second protrusion and the second recess of the locking member located at the operating part and the body part are respectively positioned at the first recess and the first protrusion of the accommodating groove which the locking member is located in. Such configuration design makes the control assembly positioned in the accommodating groove stably, and makes the entire dumbbell firm in structure.

[0023]In another embodiment, each of the accommodating grooves is provided on an inner wall thereof with at least one first stopping part. Each of the control assemblies includes a vertical rod, an elastic member, and a locking member. The vertical rod is fixed to the transverse rod. The locking member is sleeved onto the vertical rod. There is a limiting space between the locking member and the vertical rod. The elastic member is constrained in the limiting space. The locking member is provided on an outer surface thereof with at least one second stopping part. Each of the control assemblies is positioned in one of the accommodating grooves in a positioned status, and changeable into a pressed status by the user pressing the locking member downwardly. When the control assembly is in the positioned status, the locking member is affected by the elastic member so that the second stopping part is positioned at the first stopping part of the accommodating groove which the locking member is located in. When the control assembly is in the pressed status, the second stopping part of the locking member leaves the first stopping part of the accommodating groove which the locking member is located in, so that the control assembly and the transverse rod fixed to the vertical rod of the control assembly are movable along the horizontal axis by the user.

[0024]As a result, as long as the user presses the locking member of the control assembly downwardly, the user can move the control assembly to move the transverse rod connected therewith, so as to adjust the amount of the weight plates of the dumbbell. When the user moves the control assembly to the desired position, the user only has to let go of the locking member to position the control assembly at the desired position stably. Such configuration is fast and easy in use, and makes the entire dumbbell firm in structure.

[0025]Preferably, when the control assembly is changed from the positioned status into the pressed status, the vertical rod remains stationary, and the limiting space is reduced due to the downward movement of the locking member, so that the elastic member is compressed. Such configuration design is simple, easy to manufacture and assemble, makes the control assembly positioned in the accommodating groove stably, and allows the user to operate the locking member easily.

[0026]Preferably, the locking member includes an operating part, and a body part extending downwardly from the operating part and smaller in width than the operating part. Each of the accommodating grooves includes a relatively wider part and a relatively narrower part, which correspond in shape and position to the operating part and the body part of the locking member respectively. Each of the accommodating grooves includes a plurality of the aforementioned first stopping parts. The first stopping parts include a first hook portion located at the relatively wider part, and a first hook hole located at the relatively narrower part. Each of the locking members includes a plurality of the aforementioned second stopping parts. The second stopping parts include a second hook hole located at the operating part, and a second hook portion located at the body part.

[0027]As a result, when the control assembly is in the positioned status, the second hook hole and the second hook portion of the locking member located at the operating part and the body part respectively are positioned at the first hook portion and the first hook hole of the accommodating groove which the locking member is located in. Such configuration design makes the control assembly positioned in the accommodating groove stably, and makes the entire dumbbell firm in structure.

[0028]Preferably, the two channels of the main body are located inside the handlebar. Such arrangement is especially suitable to the above-described two embodiments. The arrangement of the two channels inside the handlebar makes the transverse rods for connecting the weight plates approximately located at the centers of the weight plates and the centers of the weight-loading portions. That makes the overall combination more stable, and facilitates the weight plates and the weight-loading portions to be provided with the accommodating grooves, allowing for the arrangement of the control assemblies that are easy in operation and have good positioning effect.

[0029]Alternatively, in another embodiment of the present invention, the main body further includes two pipes fixed between the two weight-loading portions, and the two channels are located inside the two pipes respectively.

[0030]Preferably, each of the pipes has an elongated hole extending along the horizontal axis, and a plurality of positioning holes opposite to the elongated hole. Each of the transverse rods has an installation hole perpendicular to the horizontal axis. The control unit of the adjusting device includes two control assemblies. The two control assemblies are inserted through the elongated holes of the two pipes respectively, and inserted in the installation holes of the two transverse rods respectively. Each of the control assemblies is movable by a user and optionally positioned in one of the positioning holes.

[0031]As a result, the user can move the control assembly along the elongated hole to move the transverse rod connected therewith, and can position the control assembly in the positioning hole for positioning the transverse rod, so as to adjust the amount of the weight plates of the dumbbell. Besides, the two control assemblies are disposed on the two pipes of the main body, so the two control assemblies are installed on the dumbbell, that is space-saving and convenient for operation. The two channels are not located inside the handlebar, but located inside the two pipes which are located outside the handlebar. Therefore, even though the control assemblies are directly disposed in the channels and the transverse rods, they will not cause an obstruction when the user holds the dumbbell. In this way, the weight-loading portions and the weight plates have no need to be provided with the accommodating grooves for accommodating the control assemblies, so that the overall configuration design is simple, easy to manufacture and assemble.

[0032]More preferably, each of the control assemblies includes a locking member and an elastic member. The locking member includes a body part inserted in the elongated hole and the installation hole, and an operating part and a positioning part located at two ends of the body part respectively. The operating part is located outside the pipe for the user to operate the locking member. The elastic member is sleeved onto the body part, and constrained between the positioning part and the transverse rod. Each of the control assemblies is positioned in one of the positioning holes in a positioned status, and changeable into a pulled-out status by the user pulling the locking member outward from the pipe. When the control assembly is in the positioned status, the positioning part of the locking member is affected by the elastic member to be embedded in the positioning hole which the locking member is located at. When the control assembly is in the pulled-out status, the positioning part of the locking member leaves the positioning hole, so that the control assembly and the transverse rod connected with the control assembly are movable along the horizontal axis by the user.

[0033]As a result, as long as the user pulls the locking member of the control assembly outwardly from the pipe, the user can move the control assembly to move the transverse rod connected therewith, so as to adjust the amount of the weight plates of the dumbbell. When the user moves the control assembly to the desired position, the user only has to aim the locking member at the positioning hole at the desired position and let go of the locking member to position the control assembly at the desired position stably. Such configuration is fast and easy in use, and makes the entire dumbbell very firm in structure.

[0034]In other embodiments of the present invention, the dumbbell structure further includes a base for the main body and the two weight units to be placed on the base. The control unit of the adjusting device is disposed in the base. The control unit includes a control member, a rotating member rotatable by the control member, and a linearly moving member displaceable along the horizontal axis by being driven by the rotating member. When the main body and the two weight units are placed on the base, the linearly moving member is connected with the transverse rod in a way that the transverse rod is displaceable along the horizontal axis along with the linearly moving member.

[0035]As a result, the control unit of the adjusting device is disposed in the base rather than the main body or the two weight units, so the control unit will not be located on the dumbbell. That can avoid causing obstruction when the user uses the dumbbell for training, and prevent the user from accidentally touching the control unit. When the main body and the two weight units are placed on the base, the user can use the control member to control the linearly moving member to drive the transverse rod connected therewith to move, so as to adjust the amount of the weight plates of the dumbbell.

[0036]Preferably, each of the two weight-loading portions of the main body and the weight plates includes a bottom side, and an accommodating groove extending upwardly from the bottom side. The accommodating groove and the through hole of each of the weight-loading portions communicate with each other. The accommodating groove and the connecting hole of each of the weight plates communicate with each other. Each of the transverse rods includes a transverse rod body, and a vertical connector connected to an end of the transverse rod body. The vertical connector is located in one of the accommodating grooves, and the vertical connector is provided at a bottom end thereof with a first positioning part. The control unit includes two aforementioned linearly moving members. Each of the linearly moving members includes a vertical positioning rod, and each of the vertical positioning rods is provided at a top end thereof with a second positioning part. When the main body and the two weight units are placed on the base, the two vertical positioning rods are respectively inserted in the accommodating grooves which the two vertical connectors are located in, and the second positioning parts of the two vertical positioning rods are positioned with the first positioning parts of the two vertical connectors respectively to make the two transverse rods replaceable along the horizontal axis along with the two linearly moving members respectively.

[0037]As a result, the user can adjust the amount of the weight plates of the dumbbell only by placing the main body and the two weight units on the base and operating the control assembly to move the two linearly moving members so as to move the two transverse rods. When the user moves the two transverse rods to the desired position, the user only has to stop operating the control assembly to position the two transverse rods at the desired position. After that, the user only has to lift the main body from the base to obtain the dumbbell installed with the required number of weight plates. Such weight adjusting manner is very fast and easy.

[0038]Preferably, the rotating member is a gear. Each of the linearly moving members includes a rack. The racks of the two linearly moving members are engaged with the gear in a way that the racks are replaceable toward opposite directions by being driven by the gear.

[0039]As a result, the control member may be, for example, an electrically controlled motor or a manually controlled knob, for controlling the gear to rotate. The gear can drive the two linearly moving members to displace toward opposite directions simultaneously, and therefore can drive the two transverse rods to move to the desired position simultaneously. That is, the two transverse rods are controlled at the same time to connect the required number of weight plates. Such weight adjusting manner is not only faster and easier, but also able to ensure that the amounts of the weight plates installed at two ends of the handlebar are the same, thereby more convenient in use.

[0040]Preferably, the dumbbell structure includes two aforementioned main bodies, and four aforementioned weight units. The adjusting device includes four aforementioned transverse rods, and four aforementioned vertical positioning rods. Each of the main bodies is provided therein with two of the transverse rods. Each of the linearly moving members includes a connecting plate fixed to the rack. Each of the connecting plates is connected with two of the vertical positioning rods. When the two main bodies and the four weight units are placed on the base, the four vertical positioning rods are respectively inserted in the accommodating grooves which the vertical connectors of the four transverse rods are located in, and the second positioning parts of the four vertical positioning rods are positioned with the first positioning parts of the four vertical connectors respectively, so that when being rotated, the rotating member drives the four transverse rods to displace along the horizontal axis simultaneously.

[0041]As a result, the dumbbell structure includes two dumbbells for the user to use with both hands. As long as the user uses the control member to rotate the gear, the gear will drive the two linearly moving members to displace toward opposite directions simultaneously, so as to drive the four transverse rods to move to the desired position simultaneously. That is, the four transverse rods are controlled at the same time to connect the required number of weight plates, so that the amounts of the weight plates installed at two ends of the handlebars of the two dumbbells are adjusted at the same time. Such weight adjusting manner is not only faster and easier, but also able to ensure that the amounts of the weight plates installed at two ends of the handlebars of the two dumbbells are all the same, thereby more convenient in use.

[0042]Further scope of applicability of the present invention will become apparent from the detailed description given hereinafter. However, it should be understood that the detailed description and specific examples, while indicating preferred embodiments of the invention, are given by way of illustration only, since various changes and modifications within the scope of the invention will become apparent to those skilled in the art from this detailed description.

BRIEF DESCRIPTION OF THE DRAWINGS

[0043]FIG. 1 is an assembled perspective view of a weight adjustable dumbbell structure according to a first preferred embodiment of the present invention.

[0044]FIG. 2 is an assembled perspective view of a main body and an adjusting device of the dumbbell structure.

[0045]FIG. 3 is a sectional view taken along the line 3-3 in FIG. 2.

[0046]FIG. 4 is a planar view of a weight-loading portion of the main body.

[0047]FIG. 5 is an exploded perspective view of two weight plates of the dumbbell structure.

[0048]FIG. 6 is similar to FIG. 2, but showing the status after a control assembly and a transverse rod of the adjusting device are moved.

[0049]FIG. 7 is a sectional view taken along the line 7-7 in FIG. 2, showing that the control assembly is in a positioned status.

[0050]FIG. 8 is similar to FIG. 7, but showing that the control assembly is in a pulled-up status.

[0051]FIGS. 9-11 are similar to FIG. 1, showing the process of operating the adjusting device.

[0052]FIG. 12 is an assembled perspective view of a weight adjustable dumbbell structure according to a second preferred embodiment of the present invention.

[0053]FIG. 13 is an assembled perspective view of a main body and an adjusting device of the dumbbell structure.

[0054]FIG. 14 is an exploded perspective view of two weight plates of the dumbbell structure.

[0055]FIG. 15 is a sectional view taken along the line 15-15 in FIG. 13, showing that a control assembly of the adjusting device is in a positioned status.

[0056]FIG. 16 is similar to FIG. 15, but showing that the control assembly is in a pressed status.

[0057]FIG. 17 is an assembled perspective view of a weight adjustable dumbbell structure according to a third preferred embodiment of the present invention.

[0058]FIG. 18 is an assembled perspective view of a main body and an adjusting device of the dumbbell structure.

[0059]FIG. 19 is a sectional view taken along the line 19-19 in FIG. 18.

[0060]FIG. 20 is an exploded perspective view of two weight plates of the dumbbell structure.

[0061]FIG. 21 is similar to FIG. 19, but showing the status after two control assemblies and two transverse rods of the adjusting device are moved.

[0062]FIG. 22 is an enlarged view of a part of FIG. 19, showing that the control assembly is in a positioned status.

[0063]FIG. 23 is similar to FIG. 22, but showing that the control assembly is in a pulled-out status.

[0064]FIG. 24 is an assembled perspective view of a weight adjustable dumbbell structure according to a fourth preferred embodiment of the present invention.

[0065]FIG. 25 is a sectional view taken along the line 25-25 in FIG. 24.

[0066]FIG. 26 is an assembled perspective view of a base and a control unit of the dumbbell structure.

[0067]FIG. 27 is similar to FIG. 26, but showing the status after an upper cover and a lower cover of the base are removed.

[0068]FIG. 28 is a front view of FIG. 27.

[0069]FIG. 29 is similar to FIG. 27, but showing the status that partial components are removed to expose a rotational shaft.

[0070]FIG. 30 is a top view of FIG. 29.

[0071]FIG. 31 is an assembled perspective view of a main body and two transverse rods of the dumbbell structure.

[0072]FIG. 32 is a sectional view taken along the line 32-32 in FIG. 31.

[0073]FIG. 33 is similar to FIG. 31, but showing the status after the two transverse rods are moved.

[0074]FIG. 34 is an exploded perspective view of two weight plates of the dumbbell structure.

[0075]FIG. 35 is an assembled perspective view of a part of one of the transverse rods and a linearly moving member of the dumbbell structure.

[0076]FIG. 36 is an exploded perspective view of a weight adjustable dumbbell structure of a fifth preferred embodiment of the present invention.

DETAILED DESCRIPTION OF THE INVENTION

[0077]First of all, it is to be mentioned that same or similar reference numerals used in the following embodiments and the appendix drawings designate same or similar elements or the structural features thereof throughout the specification for the purpose of concise illustration of the present invention. It should be noticed that for the convenience of illustration, the components and the structure shown in the figures are not drawn according to the real scale and amount, and the features mentioned in each embodiment can be applied in the other embodiments if the application is possible in practice. Besides, when it is mentioned that an element is disposed on another element, it means that the former element is directly disposed on the latter element, or the former element is indirectly disposed on the latter element through one or more other elements between aforesaid former and latter elements. When it is mentioned that an element is directly disposed on another element, it means that no other element is disposed between aforesaid former and latter elements.

[0078]Referring to FIG. 1 to FIG. 11, a weight adjustable dumbbell structure 11 according to a first preferred embodiment of the present invention includes a base 20, a main body 30, two weight units including a first weight unit 40A and a second weight unit 40B, and an adjusting device 50.

[0079]In appearance, the main body 30 includes a handlebar 31, and two weight-loading portions fixed to two ends of the handlebar 31 respectively, including a first weight-loading portion 32A and a second weight-loading portion 32B. The handlebar 31 is provided therein with two channels 33A, 33B as shown in FIG. 3, which extend along a horizontal axis, i.e. Y-axis shown in FIG. 1. The first and second weight-loading portions 32A, 32B each include a fixed surface 321 fixed to the handlebar 31, a combining surface 322 opposite to the fixed surface 321, and a through hole 323 penetrating through the fixed surface 321 and the combining surface 322 as shown in FIG. 4. In this embodiment, the through holes 323 of the first and second weight-loading portions 32A, 32B both communicate with the two channels 33A, 33B, but the present invention is unlimited thereto. The through hole 323 of the first weight-loading portion 32A only has to communicate with the channel 33A, and the through hole 323 of the second weight-loading portion 32B only has to communicate with the channel 33B.

[0080]As shown in FIG. 2 and FIG. 4, each of the first and second weight-loading portions 32A, 32B includes a combining recess 324 recessed from the combining surface 322. The combining recess 324 includes an upper section 324a recessed to a relatively lower extent, and a lower section 324b recessed to a relatively higher extent. The lower section 324b extends from the lower edge of the upper section 324a to a bottom side 325 of the weight-loading portion. Besides, the first and second weight-loading portions 32A, 32B each further include an accommodating groove 61. The accommodating groove 61 of the weight-loading portion is located at the upper section 324a of the combining recess 324, extends downwardly from a top side 327 of the weight-loading portion, and communicates with the through hole 323. The accommodating groove 61 includes a relatively wider part 611 located at the top side 327, and a relatively narrower part 612 extending downwardly from the relatively wider part 611 to the through hole 323 and smaller in width than the relatively wider part 611. The accommodating groove 61 is provided on two opposite inner walls 613 thereof with two first stopping parts respectively. In this embodiment, the aforementioned two first stopping parts include a first recess 614 located at the relatively wider part 611 as shown in FIG. 6, and a first protrusion 615 located at the relatively narrower part 612.

[0081]As shown in FIG. 1, the first and second weight units 40A, 40B each include four weight plates 41 detachably combined in a stacked manner. The weight plates 41 other than the farthest weight plates 41 from the main body 30 are all as shown in FIG. 5, each including a first combining surface 411, a second combining surface 412 opposite to the first combining surface 411, and a connecting hole 413 penetrating through the first combining surface 411 and the second combining surface 412, and also including an accommodating groove 61 as described above. The farthest weight plates 41 from the main body 30 are similar to the weight plates 41 shown in FIG. 5, but each include a covering plate 415 covering the connecting hole 413 and the accommodating groove 61 on the second combining surface 412.

[0082]The second combining surface 412 of each of the weight plates 41 is shaped similarly to the above-described combining surface 322 of the weight-loading portion. Each of the second combining surfaces 412 has a combining recess 416 recessed therefrom. The combining recess 416 includes an upper section 416a recessed to a relatively lower extent, and a lower section 416b recessed to a relatively higher extent. The lower section 416b extends from the lower edge of the upper section 416a to a bottom side 417 of the weight plate 41. Oppositely, each of the weight plates 41 includes a combining portion 418 protruding from the first combining surface 411 and shaped complementarily to the upper section 416a of the combining recess 416. The combining recess 416 is suitable to embed the combining portion 418 therein in a downward sliding manner. That is, the weight plates 41 shown in FIG. 5 are combined in a way that the bottom side 417 of the right weight plate 41 slides downwardly from the top side 419 of the left weight plate 41. In other words, the second combining surface 412 of the right weight plate 41 is combined with the first combining surface 411 of the left weight plate 41 in a downward sliding manner. When the weight plates 41 are separated, the second combining surface 412 of the right weight plate 41 is separated from the first combining surface 411 of the left weight plate 41 in an upward sliding manner. The first and second weight-loading portions 32A, 32B of the main body 30 are combined with the weight plates 41 in the same manner. That is, the combining surfaces 322 of the first and second weight-loading portions 32A, 32B are combined with the first combining surfaces 411 of the weight plates 41 in a downward sliding manner, and separated from the first combining surfaces 411 in an upward sliding manner.

[0083]The weight plates 41 and the first and second weight-loading portions 32A, 32B all have the accommodating grooves 61 with the same shape, and the connecting holes 413 of the weight plates 41 are the same in shape with the through holes 323 of the first and second weight-loading portions 32A, 32B. The accommodating groove 61 of each of the weight plates 41 is located at the upper section 416a of the combining recess 416, extends downwardly from the top side 419 of the weight plate 41, and communicates with the connecting hole 413.

[0084]In the status shown in FIG. 1, the main body 30 and the first and second weight units 40A, 40B are combined with each other, and placed on the base 20. The weight plates 41 of the first weight unit 40A are combined in a stacked manner in a way as described above that the combining recess 416 embeds the combining portion 418 therein. The combining portion 418 of the first combining surface 411 of one of the weight plates 41 of the first weight unit 40A is embedded in the combining recess 324 of the combining surface 322 of the first weight-loading portion 32A. At this time, the connecting holes 413 of the weight plates 41 of the first weight unit 40A communicate with each other, and communicate with the through hole 323 of the first weight-loading portion 32A. Besides, the accommodating grooves 61 of the weight plates 41 of the first weight unit 40A communicate with each other, and communicate with the accommodating groove 61 of the first weight-loading portion 32A. Likewise, the weight plates 41 of the second weight unit 40B are combined in a stacked manner in a way as described above that the combining recess 416 embeds the combining portion 418 therein. The combining portion 418 of the first combining surface 411 of one of the weight plates 41 of the second weight unit 40B is embedded in the combining recess 324 of the combining surface 322 of the second weight-loading portion 32B. At this time, the connecting holes 413 of the weight plates 41 of the second weight unit 40B communicate with each other, and communicate with the through hole 323 of the second weight-loading portion 32B. Besides, the accommodating grooves 61 of the weight plates 41 of the second weight unit 40B communicate with each other, and communicate with the accommodating groove 61 of the second weight-loading portion 32B.

[0085]As shown in FIG. 2 and FIG. 3, the adjusting device 50 includes two transverse rods including a first transverse rod 51A and a second transverse rod 51B, which are inserted in the two channels 33A, 33B of the handlebar 31 respectively, and a control unit 52 which can control the first and second transverse rods 51A, 51B to slide along the horizontal axis (Y-axis). The control unit 52 in this embodiment includes two control assemblies 53 for controlling the first and second transverse rods 51A, 51B respectively.

[0086]Each of the control assemblies 53 includes a vertical rod 531, an elastic member 532 as shown in FIG. 7, and a locking member 533. The bottom ends of the vertical rods 531 of the two control assemblies 53 are respectively fixed to an end of the first transverse rod 51A and an end of the second transverse rod 51B at the positions corresponding to the through holes 323 of the first and second weight-loading portions 32A, 32B of the main body 30. The locking member 533 is sleeved onto the vertical rod 531. There is a limiting space 534 between the inner surface of the locking member 533 and the vertical rod 531. The elastic member 532 is sleeved onto the vertical rod 531, and constrained in the limiting space 534. The locking member 533 includes an operating part 535, and a body part 536 extending downwardly from the operating part 535 and smaller in width than the operating part 535. The operating part 535 and the body part 536 correspond in shape and position to the relatively wider part 611 and the relatively narrower part 612 of each of the accommodating grooves 61 respectively. Besides, the locking member 533 is provided on the outer surface thereof with two side walls 537 facing toward opposite directions. Each of the two side walls 537 is provided with two second stopping parts. In this embodiment, the aforementioned two second stopping parts include a second protrusion 538 located at the operating part 535, and a second recess 539 located at the body part 536.

[0087]In the status shown in FIG. 1 and FIG. 2, the two control assemblies 53 are respectively positioned in the accommodating grooves 61 of the first and second weight-loading portions 32A, 32B of the main body 30 in a positioned status S1 as shown in FIG. 7. Each of the control assemblies 53 is changeable into a pulled-up status S2 as shown in FIG. 8 and FIG. 9 by the user pulling the locking member 533 upwardly. When the control assembly 53 is in the positioned status S1, the locking member 533 is affected by the elastic member 532 so that the second stopping parts thereof are positioned at the first stopping parts of the accommodating groove 61 which the locking member 533 is located in. That is, the second protrusion 538 and the second recess 539 of the locking member 533 are respectively positioned at the first recess 614 and the first protrusion 615 of the accommodating groove 61 which the locking member 533 is located in. At this time, the control assembly 53 and the transverse rod fixed to the vertical rod 531 of the control assembly 53 are both unmovable. When the user pulls the locking member 533 upwardly, the vertical rod 531 remains stationary, and the limiting space 534 is reduced due to the upward movement of the locking member 533, so that the elastic member 532 is compressed. When the locking member 533 is pulled upwardly to a certain height to make the control assembly 53 in the pulled-up status S2, the second protrusion 538 and the second recess 539 of the locking member 533 are respectively separated from the first recess 614 and the first protrusion 615 of the accommodating groove 61 which the locking member 533 is located in, so that the positioned relationship therebetween is relieved.

[0088]Therefore, when the user makes the control assembly 53 connected with the first transverse rod 51A in the pulled-up status S2, the user can move the control assembly 53 along Y-axis to the accommodating groove 61 of anyone of the weight plates 41 of the first weight unit 40A, such that the first transverse rod 51A is moved along with the control assembly 53 to penetrate through the through hole 323 of the first weight-loading portion 32A so as to slide to the connecting hole 413 of the weight plate 41 which the control assembly 53 is located at. For example, in the case that the user wants to use all the weight plates 41 of the first weight unit 40A, the user moves the control assembly 53 to the position shown in FIG. 10 such that the first transverse rod 51A is inserted in the connecting holes 413 of all the weight plates 41 of the first weight unit 40A. After selecting the weight plates 41 to be installed, the user only has to let go of the locking member 533. The locking member 533 will be affected by the elastically restoring force from the elastic member 532 to move downwardly, such that the control assembly 53 is restored to the positioned status S1. At this time, the control assembly 53 is positioned in the accommodating groove 61 of the weight plate 41 which the control assembly 53 is located at, as shown in FIG. 11. In other words, according to the number of weight plates 41 the user wants to use, the user can move the two control assemblies 53 to their respective corresponding positions, so as to use the two control assemblies 53 to move the first and second transverse rods 51A, 51B respectively to make the first and second transverse rods 51A, 51B connect the required number of weight plates 41. After the adjustment is finished, the user only has to lift the handlebar 31 upwardly to obtain the dumbbell installed with the required number of weight plates 41. Such weight adjusting manner is fast and easy, and makes the entire dumbbell firm in structure.

[0089]Through the configuration design of the combining surfaces 322 of the first and second weight-loading portions 32A, 32B of the main body 30 and the first and second combining surfaces 411, 412 of the weight plates 41, when a part of the weight plates 41 are not connected by the transverse rods and the user lifts the handlebar 31 upwardly, the weight plates 41 connected by the transverse rods are stably fixed to the main body 30 and thereby lifted along with the main body 30. Meanwhile, the weight plates 41 not connected by the transverse rods are left on the base 20, and separated from the lifted weight plates 41 quickly and smoothly. When the user finishes using the dumbbell or wants to change the amount of the weight plates 41 of the dumbbell, the user can easily combine all the weight plates 41 of the same weight unit again only by positionally aiming the dumbbell at the unused weight plates 41 and putting down the dumbbell. Besides, in the process that a weight plate 41 is combined with another weight plate 41 or weight plates 41 are combined with the first and second weight-loading portions 32A, 32B, the configuration design that each of the combining recesses 324, 416 is provided with the lower section 324b, 416b recessed to a relatively higher extent facilitates smooth assembly of two components even if they are slightly inclined relative to each other.

[0090]Referring to FIG. 12 to FIG. 16, a weight adjustable dumbbell structure 12 according to a second preferred embodiment of the present invention is similar to that in the first preferred embodiment, but the primary difference therebetween lies in the two control assemblies 53 of the adjusting device 50, and the accommodating grooves 61 provided on the first and second weight-loading portions 32A, 32B of the main body 30 and the weight plates 41 of the first and second weight units 40A, 40B for accommodating the two control assemblies 53.

[0091]The accommodating groove 61 in this embodiment is approximately similar to the accommodating groove 61 in the first preferred embodiment, but the primary difference therebetween lies in the configurations of the two first stopping parts on each inner wall 613 of the accommodating groove 61. In this embodiment, the aforementioned two first stopping parts include a first hook portion 616 located at the relatively wider part 611 of the accommodating groove 61, and a first hook hole 617 located at the relatively narrower part 612 of the accommodating groove 61.

[0092]The control assembly 53 in this embodiment is approximately similar to the control assembly 53 in the first preferred embodiment, also including a vertical rod 531, an elastic member 532 and a locking member 533. The bottom ends of the vertical rods 531 of the two control assemblies 53 are fixed to an end of the first transverse rod 51A and an end of the second transverse rod 51B respectively. The locking member 533 is sleeved onto the vertical rod 531. There is a limiting space 534 between the top end of the vertical rod 531 and the locking member 533. The elastic member 532 is constrained in the limiting space 534. Besides, the locking member 533 also includes an operating part 535 and a body part 536 corresponding in shape and position to the relatively wider part 611 and the relatively narrower part 612 of the accommodating groove 61, but in this embodiment the two second stopping parts on each side wall of the locking member 533 include a second hook hole 540 located at the operating part 535, and a second hook portion 541 located at the body part 536.

[0093]As shown in FIG. 15 and FIG. 16, each of the control assemblies 53 is positioned in the accommodating groove 61 of the weight-loading portion of the main body 30, or positioned in the accommodating groove 61 of the weight plate 41, in a positioned status S1, and changeable into a pressed status S3 by the user pressing the locking member 533 downwardly. When the control assembly 53 is in the positioned status S1, the locking member 533 is affected by the elastic member 532 so that the second stopping parts thereof are positioned at the first stopping parts of the accommodating groove 61 which the locking member 533 is located in. That is, the second hook hole 540 and the second hook portion 541 of the locking member 533 are respectively positioned at the first hook portion 616 and the first hook hole 617 of the accommodating groove 61 which the locking member 533 is located in. At this time, the control assembly 53 and the transverse rod fixed to the vertical rod 531 of the control assembly 53 are both unmovable. When the user presses the locking member 533 downwardly, the vertical rod 531 remains stationary, and the limiting space 534 is reduced due to the downward movement of the locking member 533, so that the elastic member 532 is compressed. When the locking member 533 is pressed down to a certain depth to make the control assembly 53 in the pressed status S3, the second hook hole 540 and the second hook portion 541 of the locking member 533 are respectively separated from the first hook portion 616 and the first hook hole 617 of the accommodating groove 61 which the locking member 533 is located in, so that the positioned relationship therebetween is relieved.

[0094]As a result, this embodiment can achieve similar effects to the first preferred embodiment, but the difference therebetween lies in that the adjusting device 50 in this embodiment is adapted for the user to move the control assembly 53 and the transverse rod fixed to the vertical rod 531 of the control assembly 53 along the horizontal axis (Y-axis) when pressing the locking member 533 downwardly, so as to adjust the amount of the weight plates 41 to be used. After the adjustment is finished, the user only has to let go of the locking member 533. The locking member 533 will be affected by the elastically restoring force from the elastic member 532 to move upwardly, such that the control assembly 53 is positioned in the accommodating groove 61 again. Such weight adjusting manner is fast and easy, and makes the entire dumbbell firm in structure.

[0095]Referring to FIG. 17 to FIG. 23, a weight adjustable dumbbell structure 13 according to a third preferred embodiment of the present invention is similar to those in the above-described first and second preferred embodiments, but the primary difference therebetween lies in the structure of the adjusting device and where it is disposed. The dumbbell structure 13 in this embodiment includes a base 20, a main body 30, first and second weight units 40A, 40B, and an adjusting device 50′.

[0096]The main body 30 includes a handlebar 31, first and second weight-loading portions 32A, 32B fixed to two ends of the handlebar 31 respectively, two pipes 34 fixed between the first and second weight-loading portions 32A, 32B, and two channels 33A, 33B located inside the two pipes 34 respectively. Each of the channels 33A, 33B extends along a horizontal axis (Y-axis). The first and second weight-loading portions 32A, 32B each include a combining surface 322, and two through holes 323 penetrating through the combining surface 322 and communicating with the two channels 33A, 33B respectively. However, the first weight-loading portion 32A only needs to have the through hole 323 communicating with the channel 33A, and the second weight-loading portion 32B only needs to have the through hole 323 communicating with the channel 33B. The first and second weight-loading portions 32A, 32B each include a combining recess 324 recessed from the combining surface 322.

[0097]The first and second weight units 40A, 40B each include five weight plates 41 detachably combined in a stacked manner. Each of the weight plates 41 includes a first combining surface 411, a second combining surface 412 opposite to the first combining surface 411, and a connecting hole 413 penetrating through the first combining surface 411 and the second combining surface 412. There is a combining portion 418 protruding from the first combining surface 411, and there is a combining recess 416 recessed from the second combining surface 412. The combining recesses 416 of the second combining surfaces 412 of the weight plates 41 and the combining recesses 324 of the combining surfaces 322 of the first and second weight-loading portions 32A, 32B have the same shape, all capable of embedding the combining portion 418 of the first combining surface 411 of the weight plate 41 in a downward sliding manner. In the status shown in FIG. 17, the weight plates 41 of the first weight unit 40A are combined in a stacked manner in a way that the combining recess 416 embeds the combining portion 418 therein, and one of the weight plates 41 is combined to the combining surface 322 of the first weight-loading portion 32A. At this time, the connecting holes 413 of the weight plates 41 of the first weight unit 40A communicate with each other, and communicate with the through hole 323 of the first weight-loading portion 32A. Likewise, the weight plates 41 of the second weight unit 40B are combined in a stacked manner in a way that the combining recess 416 embeds the combining portion 418 therein, and one of the weight plates 41 is combined to the combining surface 322 of the second weight-loading portion 32B. At this time, the connecting holes 413 of the weight plates 41 of the second weight unit 40B communicate with each other, and communicate with the through hole 323 of the second weight-loading portion 32B.

[0098]As shown in FIG. 19, the adjusting device 50′ includes a first transverse rod 51A and a second transverse rod 51B inserted in the two channels 33A, 33B respectively, and a control unit 52 which can control the first and second transverse rods 51A, 51B to slide along the horizontal axis (Y-axis). The control unit 52 includes two control assemblies 55 disposed in the two pipes 34 respectively.

[0099]Further speaking, each of the pipes 34 has an elongated hole 341 extending along Y-axis, and six positioning holes 342 opposite to the elongated hole 341. The amount of the positioning holes 342 equals the amount of the weight plates 41 of a weight unit, i.e. five, plus one weight-loading portion, so that the sum of them is six. The function of the six positioning holes 342 is positioning a terminal end 511 of the transverse rod at the weight-loading portion as shown in FIG. 19, or at anyone of the weight plates 41 of the associated weight unit. The first and second transverse rods 51A, 51B each have an installation hole 512 as shown in FIG. 22, which extends along X-axis. The installation hole 512 has a relatively larger radius part 513 and a relatively smaller radius part 514 connected with each other, and a stair portion 515 located at the juncture of them. The two control assemblies 55 are inserted through the elongated holes 341 of the two pipes 34 respectively, and inserted in the installation holes 512 of the first and second transverse rods 51A, 51B respectively. Each of the control assemblies 55 can be moved by the user, and optionally positioned in one of the positioning holes 342.

[0100]As shown in FIG. 22 and FIG. 23, each of the control assemblies 55 primarily includes a locking member 551, and an elastic member 555. The locking member 551 includes a body part 552, and an operating part 553 and a positioning part 554 located at two ends of the body part 552 respectively. The elastic member 555 is sleeved onto the body part 552, and the body part 552 is inserted in the elongated hole 341 and the installation hole 512 in a way that the operating part 553 is located outside the pipe 34 and located correspondingly to the elongated hole 341. The elastic member 555 is constrained between the positioning part 554 and the stair portion 515 of the installation hole 512. Each of the control assemblies 55 is positioned in one of the positioning holes 342 in a positioned status S1, and changeable into a pulled-out status S4 by the user pulling the locking member 551 outwardly from the pipe 34. When the control assembly 55 is in the positioned status S1, the positioning part 554 of the locking member 551 is affected by the elastic member 555 to be embedded in the positioning hole 342 which the locking member 551 is located at. At this time, the control assembly 55 and the transverse rod which the control assembly 55 is inserted through are both unmovable. When the user pulls the locking member 551 outwardly from the pipe 34 to make the control assembly 55 in the pulled-out status S4, the positioning part 554 of the locking member 551 leaves the positioning hole 342 and retracts into the installation hole 512 of the transverse rod, so that the elastic member 555 is compressed. At this time, the positioned relationship between the control assembly 55 and the pipe 34 is relieved, so the user can move the control assembly 55 and the transverse rod which the control assembly 55 is inserted through along Y-axis.

[0101]Therefore, when the user makes the control assembly 55 connected with the first transverse rod 51A in the pulled-out status S4, the user can move the control assembly 55 along Y-axis to the position corresponding to anyone of the positioning holes 342 of the pipe 34 which the control assembly 55 is located in, such that the first transverse rod 51A is moved along with the control assembly 55, and can penetrate through the through hole 323 of the first weight-loading portion 32A to slide to the connecting hole 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 has to let go of the locking member 551. The locking member 551 will be affected by the elastically restoring force from the elastic member 555 to move into the pipe 34, such that the control assembly 55 is restored to the positioned status S1. At this time, the positioning part 554 of the locking member 551 is embedded into the positioning hole 342 which the locking member 551 is located at. In other words, according to the amount of the weight plates 41 the user wants to use, the user can move the two control assemblies 55 to their respective corresponding positions, so as to use the two control assemblies 55 to move the first and second transverse rods 51A, 51B respectively to make the first and second transverse rods 51A, 51B connect the required number of weight plates 41. For example, in the case that the user wants to use all the weight plates 41 of the first and second weight units 40A, 40B, the user moves the two control assemblies 55 to the positions shown in FIG. 21 such that the first and second transverse rods 51A, 51B are inserted in the connecting holes 413 of all the weight plates 41 of the first and second weight units 40A, 40B respectively. After the adjustment is finished, the user only has to lift the handlebar 31 upwardly to obtain the dumbbell installed with the required number of weight plates 41. Such weight adjusting manner is fast and easy, and makes the entire dumbbell firm in structure.

[0102]Referring to FIG. 24 to FIG. 35, a weight adjustable dumbbell structure 14 according to a fourth preferred embodiment of the present invention is primarily different from each above-described embodiment in that in this embodiment the control unit is disposed in the base, and a plurality of weight units can be controlled simultaneously by a single control member.

[0103]The dumbbell structure 14 in this embodiment includes a base 20′, two main bodies 30, two first weight units 40A, two second weight units 40B, and an adjusting device 70. The first and second weight units 40A, 40B each include nine weight plates 41 detachably combined in a stacked manner. It can be seen in FIG. 24 that the dumbbell structure 14 in this embodiment includes two dumbbells, and each dumbbell is 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 their associated first and second weight units 40A, 40B are placed on the same base 20′ together. The adjusting device 70 disposed in the base 20′ can adjust the amounts of the weight plates 41 on two sides of the two dumbbells simultaneously. However, this embodiment may be configured to include only one dumbbell. That is, there may be only one main body 30, only one first weight unit 40A, and only one second weight unit 40B.

[0104]The base 20′ includes an upper cover 21, a lower cover 22, and an installation plate 23 disposed between the upper cover 21 and the lower cover 22. The installation plate 23 includes four slide grooves 231A, 231B located adjacent to four corners of the installation plate 23 respectively. The upper cover 21 includes four accommodating portions 211 for accommodating the first and second weight units 40A, 40B respectively, and four elongated holes 212A, 212B penetrating through the aforementioned four accommodating portions 211 respectively. The aforementioned four elongated holes 212A, 212B are located correspondingly to the aforementioned four slide grooves 231A, 231B of the installation plate 23 respectively. The slide grooves 231A, 231B and the elongated holes 212A, 212B all extend along a horizontal axis (Y-axis). If this embodiment is configured to include only one dumbbell, the dumbbell structure has only two accommodating portions 211, only one elongated hole 212A, only one elongated hole 212B, only one slide groove 231A, and only one slide groove 231B.

[0105]The adjusting device 70 includes a control unit 71 disposed in the base 20′, and four transverse rods. As shown in FIG. 25, the aforementioned four transverse rods include a first transverse rod 72A and a second transverse rod 72B disposed in one of the main bodies 30, and another first transverse rod 72A and another second transverse rod 72B disposed in the other main body 30. If this embodiment is configured to include only one dumbbell, the dumbbell structure has only two transverse rods.

[0106]The control unit 71 primarily includes a control member 711, a rotating member 712 which can be rotated by the control member 711, and two linearly moving members 713 which can be driven by the rotating member 712 to displace along the horizontal axis (Y-axis). The control member 711 in this embodiment is a motor. The motor is controlled by a controller 73. The user can control the operation of the motor through an operation interface (not shown) electrically connected with the controller 73. The rotating member 712 in this embodiment is a gear. When being rotated, the control member 711 drives the gear to rotate through a rotational shaft 74. Each of the linearly moving members 713 includes a rack 714, a connecting plate 715 fixed to the rack 714, and two vertical positioning rods 716 disposed on the connecting plate 715. Therefore, two linearly moving members 713 have four vertical positioning rods 716 in total, which are adapted to control the aforementioned four transverse rods respectively. If this embodiment is configured to include only one dumbbell, each of the linearly moving members 713 has only one vertical positioning rod 716, so there are only two vertical positioning rods 716 in total.

[0107]Further speaking, the racks 714 of the two linearly moving members 713 are engaged with two opposite sides of the gear, i.e. the rotating member 712. Therefore, when being rotated, the gear drives the racks 714 of the two linearly moving members 713 to displace toward opposite directions. In FIG. 30, the connecting plate 715 of the left linearly moving member 713 bridges the two slide grooves 231A, and the two vertical positioning rods 716 disposed thereon are inserted through the two slide grooves 231A respectively for controlling the first transverse rods 72A in the two main bodies 30 respectively. In FIG. 30, the connecting plate 715 of the right linearly moving member 713 bridges the two slide grooves 231B, and the two vertical positioning rods 716 disposed thereon are inserted through the two slide grooves 231B respectively for controlling the first transverse rods 72B in the two main bodies 30 respectively.

[0108]As shown in FIG. 31 to FIG. 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 embodiments, but the primary difference therebetween lies in the configurations of the accommodating grooves of the weight-loading portions and the weight plates.

[0109]The main body 30 includes a handlebar 31, first and second weight-loading portions 32A, 32B fixed to two ends of the handlebar 31 respectively, and two channels 33A, 33B located in the handlebar 31. Each of the channels 33A, 33B extends along the horizontal axis (Y-axis). The first transverse rod 72A and the second transverse rod 72B are disposed in the two channels 33A, 33B respectively. The first and second transverse rods 72A, 72B each include a transverse rod body 721, and a vertical connector 722 connected to an end of the transverse rod body 721.

[0110]The first and second weight-loading portions 32A, 32B each include a combining surface 322, and a through hole 323 penetrating through the combining surface 322 and communicating with the two channels 33A, 33B. However, the through hole 323 of the first weight-loading portion 32A only has to communicate with the channel 33A, and the through hole 323 of the second weight-loading portion 32B only has to communicate with the channel 33B. The first and second weight-loading portions 32A, 32B each include a combining recess 324 recessed from the combining surfaces 322. Besides, the first and second weight-loading portions 32A, 32B each include an accommodating groove 62 extending upwardly from the bottom side 325 of the weight-loading portion and communicating with the through hole 323.

[0111]Each of the weight plates 41 includes a first combining surface 411, a second combining surface 412 opposite to the first combining surface 411, and a connecting hole 413 penetrating through the first combining surface 411 and the second combining surface 412. There is a combining portion 418 protruding from the first combining surface 411, and there is a combining recess 416 recessed from the second combining surface 412. In addition, each of the weight plates 41 includes an accommodating groove 62 extending upwardly from the bottom side 417 of the weight plate and communicating with the connecting hole 413. The accommodating grooves 62 of the weight plates 41 are the same in shape with the accommodating grooves 62 of the first and second weight-loading portions 32A, 32B.

[0112]The combining recesses 416 of the second combining surfaces 412 of the weight plates 41 and the combining recesses 324 of the combining surfaces 322 of the first and second weight-loading portions 32A, 32B have the same shape, all capable of embedding the combining portion 418 of the first combining surface 411 of the weight plate 41 in a downward sliding manner. In the status shown in FIG. 24, the weight plates 41 of the first weight unit 40A are combined in a stacked manner in a way that the combining recess 416 embeds the combining portion 418 therein, and one of the weight plates 41 is combined to the combining surface 322 of the first weight-loading portion 32A. At this time, the connecting holes 413 of the weight plates 41 of the first weight unit 40A communicate with each other and communicate with the through hole 323 of the first weight-loading portion 32A, and the accommodating grooves 62 of the weight plates 41 of the first weight unit 40A communicate with each other and communicate with the accommodating groove 62 of the first weight-loading portion 32A. Likewise, the weight plates 41 of the second weight unit 40B are combined in a stacked manner in a way that the combining recess 416 embeds the combining portion 418 therein, and one of the weight plates 41 is combined to the combining surface 322 of the second weight-loading portion 32B. At this time, the connecting holes 413 of the weight plates 41 of the second weight unit 40B communicate with each other and communicate with the through hole 323 of the second weight-loading portion 32B, and the accommodating grooves 62 of the weight plates 41 of the first weight unit 40B communicate with each other and communicate with the accommodating groove 62 of the second weight-loading portion 32B.

[0113]As shown in FIG. 35, the vertical connector 722 of each of the transverse rods is provided at the bottom end thereof with a first positioning part 723, and each of the vertical positioning rods 716 of the control unit 71 is provided at the top end thereof with a second positioning part 717. The first positioning part 723 and the second positioning part 717 can be connected with each other or separated from each other by being moved relative to each other along a vertical axis (Z-axis). When being connected with each other as shown in FIG. 35, the first positioning part 723 and the second positioning part 717 are positioned with each other on Y-axis, which means they cannot be separated from each other by being moved relative to each other along Y-axis.

[0114]When the first and second transverse rods 72A, 72B in each of the main bodies 30 are both not stretched out, as shown in FIG. 31, the vertical connectors 722 of the transverse rods are located in the accommodating grooves 62 of the first and second weight-loading portions 32A, 32B, and the control unit 71 is correspondingly in the status shown in FIG. 29 and FIG. 30. At this time, if 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 respectively inserted in the accommodating grooves 62 which the vertical connectors 722 of the first and second transverse rods 72A, 72B are located in, and the second positioning parts 717 of the vertical positioning rods 716 are positioned with the first positioning parts 723 of the vertical connectors 722 respectively. At this time, as long as the user controls the motor (i.e. the control member 711) to rotate the gear (i.e. the rotating member 712), the gear will drive all the vertical positioning rods 716 to displace along Y-axis together. The left two vertical positioning rods 716 in FIG. 30 will displace toward the negative direction of Y-axis, and respectively drive the first transverse rods 72A in the two main bodies 30 to displace toward the negative direction of Y-axis. Meanwhile, the right two vertical positioning rods 716 in FIG. 30 will displace toward the positive direction of Y-axis, and respectively drive the second transverse rods 72B in the two main bodies 30 to displace toward the positive direction of Y-axis. As a result, the first and second transverse rods 72A, 72B are controlled by the control unit 71 simultaneously to penetrate through the through holes 323 of the first and second weight-loading portions 32A, 32B respectively so as to slide to the connecting holes 413 of the weight plates 41 of the first and second weight units 40A, 40B.

[0115]In other words, the user can operate the control unit 71 according to the amount of weight plates 41 the user wants to use, so as to move the first and second transverse rods 72A, 72B to the corresponding positions to connect the required number of weight plates 41. After the adjustment is finished, the user only has to lift the handlebar 31 upwardly to obtain the dumbbell installed with the required number of weight plates 41. Such weight adjusting manner is fast and easy, and can adjust the amounts of the weight plates 41 on two sides of the same dumbbell at the same time, and can even adjust two dumbbells at the same time. Besides, such weight adjusting manner can ensure that the amounts of the weight plates 41 installed on two sides of each dumbbell are the same, that is more convenient in use.

[0116]Referring to FIG. 36, a weight adjustable dumbbell structure 15 according to a fifth preferred embodiment of the present invention is similar to that in the fourth preferred embodiment, but the primary difference therebetween lies in that the control member 711 in this embodiment is a knob for the user to manually rotate the control member 711, so as to rotate the rotating member 712 as shown in FIG. 29 to adjust the amounts of the weight plates 41 on two sides of the handlebars 31 of the dumbbells.

[0117]Summarizing the above embodiments, the present invention provides a weight adjusting method for a weight adjustable dumbbell structure, which includes the following steps.

[0118]Provide a dumbbell structure, such as, but unlimited to, the dumbbell structures 11-15 provided in the first to fifth preferred embodiments. The dumbbell structure includes a main body 30, two weight units (i.e. the first and second weight units 40A, 40B), and an adjusting device which may be, but unlimited to, the adjusting device 50, 50′, 70 provided in the first to fifth preferred embodiments. The main body includes a handlebar 31, two weight-loading portions (i.e. the first and second weight-loading portions 32A, 32B) fixed to two ends of the handlebar 31 respectively, and two channels 33A, 33B extending along a horizontal axis. The channels 33A, 33B may be provided in the handlebar 31 or in additional pipes 34. Each of the weight-loading portions includes a combining surface 322, and a through hole 323 penetrating through the combining surface 322. The two channels 33A, 33B communicate with the through holes 323 of the two weight-loading portions respectively. The two weight units are detachably combined to the combining surfaces 322 of the two weight-loading portions respectively. Each of the weight units includes a plurality of weight plates 41 detachably combined in a stacked manner. Each of the weight plates 41 includes a first combining surface 411, a second combining surface 412 opposite to the first combining surface 411, and a connecting hole 413 penetrating through the first combining surface 411 and the second combining surface 412. The adjusting device includes two transverse rods inserted in the two channels 33A, 33B respectively, and a control unit for controlling the two transverse rods to slide along the horizontal axis. The two transverse rods may be, but unlimited to, the first and second transverse rods 51A, 51B or the first and second transverse rods 72A, 72B provided in the first to fifth preferred embodiments. The control unit may be, but unlimited to, the control unit 52, 71 provided in the first to fifth preferred embodiments.

[0119]Operate the control unit to make the two transverse rods penetrate through the through holes 323 of the two weight-loading portions respectively so as to be inserted into the connecting holes 413 of a required number of weight plates 41.

[0120]Lift the main body 30 upwardly, so that the main body 30 and the weight plates 41 connected by the two transverse rods are lifted together and collectively compose a dumbbell.

[0121]By the weight adjusting method for the weight adjustable dumbbell structure provided by the present invention, the user can quickly and conveniently adjust the amount of the weight plates on the dumbbell, making the weight of the dumbbell meet the requirement of the user.

[0122]The invention being thus described, it will be obvious that the same may be varied in many ways. Such variations are not to be regarded as a departure from the scope of the invention, and all such modifications as would be obvious to one skilled in the art are intended to be included within the scope of the following claims.